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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

Check the appropriate box:

☐	Preliminary Proxy Statement

☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒	Definitive Proxy Statement

☐	Definitive Additional Materials

☐	Soliciting Material Under §240.14a-12

GRITSTONE ONCOLOGY, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒	No fee required.

☐	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

	(1)	Title of each class of securities to which transaction applies:

	(2)	Aggregate number of securities to which transaction applies:

	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

	(4)	Proposed maximum aggregate value of transaction:

	(5)	Total fee paid:

☐	Fee paid previously with preliminary materials.

☐	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	(1)	Amount previously paid:

	(2)	Form, Schedule or Registration Statement No.:

	(3)	Filing party:

	(4)	Date Filed:

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Gritstone Oncology, Inc.

Dear Stockholder:

I am pleased to invite you to attend the 2021 Annual Meeting of Stockholders (the “Annual Meeting”) of Gritstone Oncology, Inc. (“Gritstone”), which will be held online at www.virtualshareholdermeeting.com/GRTS2021, on June 18, 2021 at 9:00 a.m. Pacific Time.

The attached Notice of Annual Meeting of Stockholders and Proxy Statement contain details of the business to be conducted at the Annual Meeting.

Whether or not you attend the Annual Meeting, it is important that your shares be represented and voted at the meeting. Therefore, I urge you to promptly vote and submit your proxy via the internet, by phone or by mail. If you decide to attend the Annual Meeting, you will be able to vote electronically or via phone using the control number on your proxy card, even if you have previously submitted your proxy.

On behalf of the Board of Directors, I would like to express our appreciation for your interest in Gritstone.

Sincerely,

Andrew Allen, M.D., Ph.D.

President and Chief Executive Officer

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GRITSTONE ONCOLOGY, INC.

5959 Horton Street, Suite 300

Emeryville, CA 94608

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON JUNE 18, 2021

To the Stockholders of Gritstone Oncology, Inc.:

NOTICE IS HEREBY GIVEN that the Annual Meeting of Stockholders (the “Annual Meeting”) of Gritstone Oncology, Inc., a Delaware corporation (the “Company”), will be held on June 18, 2021, at 9:00 a.m. Pacific Time. The Annual Meeting will be held entirely online to allow greater participation and improved communication and provide cost savings for our stockholders and the Company. You will be able to attend and participate in the Annual Meeting online by visiting www.virtualshareholdermeeting.com/GRTS2021, where you will be able to listen to the meeting live, submit questions and vote. The Annual Meeting will be held for the following purposes:

1.	To elect two Class III directors to hold office until the 2024 annual meeting of stockholders or until their successors are elected and qualified;

2.	To ratify the selection, by the audit committee of the Company’s board of directors, of Ernst & Young LLP, as the independent registered public accounting firm of the Company for its fiscal year ending December 31, 2021; and

3.	To transact such other business as may properly come before the Annual Meeting or any adjournment or postponement thereof.

The foregoing items of business are more fully described in the Proxy Statement accompanying this Notice of Annual Meeting of Stockholders. Only stockholders who owned common stock of the Company at the close of business on April 21, 2021 (the “Record Date”) can vote at this meeting or any adjournments that take place.

The board of directors recommends that you vote:

FOR the election of the director nominees named in Proposal No. 1 of the Proxy Statement; and

FOR the ratification of the appointment of Ernst & Young LLP, as the independent registered public accounting firm, as described in Proposal No. 2 of the Proxy Statement.

YOUR VOTE IS IMPORTANT. WHETHER OR NOT YOU PLAN TO ATTEND THE ANNUAL MEETING ONLINE, WE ENCOURAGE YOU TO READ THE ACCOMPANYING PROXY STATEMENT AND OUR ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 2020, AND SUBMIT YOUR PROXY AS SOON AS POSSIBLE USING ONE OF THE THREE CONVENIENT VOTING METHODS DESCRIBED IN THE “INFORMATION ABOUT THE PROXY PROCESS AND VOTING” SECTION IN THE PROXY STATEMENT. IF YOU RECEIVE MORE THAN ONE SET OF PROXY MATERIALS OR NOTICE OF INTERNET AVAILABILITY BECAUSE YOUR SHARES ARE REGISTERED IN DIFFERENT NAMES OR ADDRESSES, EACH PROXY SHOULD BE SIGNED AND SUBMITTED TO ENSURE THAT ALL OF YOUR SHARES WILL BE VOTED.

			By Order of the Board of Directors

			/s/ Andrew Allen
			Andrew Allen, M.D., Ph.D. President and Chief Executive Officer

Emeryville, California

April 23, 2021

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PROXY STATEMENT FOR THE 2021 ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON JUNE 18, 2021			1
INFORMATION ABOUT THE PROXY PROCESS AND VOTING			2
PROPOSAL NO. 1 ELECTION OF DIRECTORS			7
PROPOSAL NO. 2 RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM			11
REPORT OF THE AUDIT COMMITTEE OF THE BOARD OF DIRECTORS			12
CORPORATE GOVERNANCE			13
Code of Business Conduct and Ethics			13
Corporate Governance Guidelines			13
Independence of the Board of Directors			13
Leadership Structure of the Board			13
Role of Board in Risk Oversight Process			14
Board Committees			14
Board Diversity			16
Meetings of the Board of Directors, Board and Committee Member Attendance and Annual Meeting Attendance			17
Stockholder Communications with the Board of Directors			17
Compensation Committee Interlocks and Insider Participation			17
Derivatives Trading, Hedging, and Pledging Policies			17
CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS			18
EXECUTIVE OFFICERS			20
EXECUTIVE COMPENSATION			22
Summary Compensation Table			22
Outstanding Equity Awards at 2020 Fiscal Year End			23
Narrative to Summary Compensation Table and Outstanding Equity Awards at 2020 Fiscal Year End			23
Equity Compensation Plan Information			25
DIRECTOR COMPENSATION			26
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT			28
SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE			31
ADDITIONAL INFORMATION			31
Householding of Proxy Materials			31
Incorporation by Reference			31
Other Matters			31

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GRITSTONE ONCOLOGY, INC.

5959 Horton Street, Suite 300

Emeryville, CA 94608

PROXY STATEMENT

FOR THE 2021 ANNUAL MEETING OF STOCKHOLDERS

IMPORTANT NOTICE REGARDING THE INTERNET AVAILABILITY OF PROXY MATERIALS FOR THE STOCKHOLDER MEETING TO BE HELD ON

JUNE 18, 2021

We have sent you this Proxy Statement and the enclosed Proxy Card because the board of directors of Gritstone Oncology, Inc. (referred to herein as the “Company,” “Gritstone,” “we,” “us” or “our”) is soliciting your proxy to vote at our 2021 Annual Meeting of stockholders (the “Annual Meeting”) to be held on Friday, June 18, 2021, at 9:00 a.m. Pacific Time. The Annual Meeting can be accessed by visiting www.virtualshareholdermeeting.com/GRTS2021, where you will be able to listen to the meeting live, submit questions and vote online.

•	This Proxy Statement summarizes information about the proposals to be considered at the Annual Meeting and other information you may find useful in determining how to vote.

•	The Proxy Card is the means by which you actually authorize another person to vote your shares in accordance with your instructions.

In addition to solicitations by mail, our directors, officers and regular employees, without additional remuneration, may solicit proxies by telephone, e-mail and personal interviews. We may retain outside consultants to solicit proxies on our behalf as well. All costs of solicitation of proxies will be borne by us. Brokers, custodians and fiduciaries will be requested to forward proxy soliciting material to the owners of stock held in their names, and we will reimburse them for their reasonable out-of-pocket expenses incurred in connection with the distribution of proxy materials.

Pursuant to the rules adopted by the Securities and Exchange Commission (the “SEC”), we have elected to provide access to our Annual Meeting materials, which include this Proxy Statement and our Annual Report on Form 10-K for the year ended December 31, 2020 (the “Form 10-K”), over the internet in lieu of mailing printed copies. We will begin mailing the Notice of Internet Availability to our stockholders of record as of April 21, 2021 (the “Record Date”) for the first time on or about April 23, 2021. The Notice of Internet Availability will contain instructions on how to access and review the Annual Meeting materials and will also contain instructions on how to request a printed copy of the Annual Meeting materials. In addition, we have provided brokers, dealers, banks, voting trustees and their nominees, at our expense, with additional copies of our proxy materials and the Form 10-K so that our record holders can supply these materials to the beneficial owners of shares of our common stock as of the Record Date. The Form 10-K is also available in the “Investors & Media – SEC Filings” section of our website at http://www.gritstone.com.

The only outstanding voting securities of Gritstone are shares of common stock, $0.0001 par value per share (the “common stock”), of which there were 49,197,828 shares outstanding as of the Record Date (excluding any treasury shares). The holders of a majority in voting power of the shares of common stock issued and outstanding and entitled to vote, present in attendance online or represented by proxy, are required to hold the Annual Meeting.

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INFORMATION ABOUT THE PROXY PROCESS AND VOTING

Why am I receiving these materials?

We have made this Proxy Statement and Proxy Card available to you on the internet or, upon your request, have delivered printed proxy materials to you, because the board of directors is soliciting your proxy to vote at the Annual Meeting, including at any adjournments or postponements of the Annual Meeting. You are invited to attend the Annual Meeting online to vote on the proposals described in this Proxy Statement. However, you are not required to attend the Annual Meeting to vote your shares. Instead, you may simply complete, sign and return the Proxy Card, or follow the instructions below to submit your proxy over the telephone or on the internet.

This Proxy Statement, the Notice of Internet Availability, the Notice of Annual Meeting and accompanying Proxy Card were first made available for access by our stockholders on or about April 23, 2021 to all stockholders of record entitled to vote at the Annual Meeting.

Who can vote at the Annual Meeting?

Only stockholders of record at the close of business on the Record Date will be entitled to vote at the Annual Meeting. At the close of business on the Record Date, there were 49,197,828 shares of common stock issued and outstanding and entitled to vote.

Stockholder of Record: Shares Registered in Your Name

If, on the Record Date, your shares were registered directly in your name with the transfer agent for our common stock, American Stock Transfer & Trust Company, LLC, then you are a stockholder of record. As a stockholder of record, you may vote at the Annual Meeting by attending the Annual Meeting online and following the instructions posted at www.virtualshareholdermeeting.com/GRTS2021 or you may vote by proxy. Whether or not you plan to attend the Annual Meeting online, we encourage you to fill out and return the Proxy Card or vote by proxy over the telephone or on the internet as instructed below to ensure your vote is counted.

Beneficial Owner: Shares Registered in the Name of a Broker, Bank or Other Agent

If, on the Record Date, your shares were held in an account at a brokerage firm, bank, dealer or other similar organization, then you are the beneficial owner of shares held in “street name” and these proxy materials are being forwarded to you by that organization. The organization holding your account is considered the stockholder of record for purposes of voting at the Annual Meeting. As a beneficial owner, you have the right to direct your broker or other agent on how to vote the shares in your account. You are also invited to attend the Annual Meeting online at www.virtualshareholdermeeting.com/GRTS2021. However, since you are not the stockholder of record, you may not vote your shares at the Annual Meeting by attending the Annual Meeting online unless you request and obtain a valid Proxy Card from your broker or other agent.

What am I being asked to vote on?

You are being asked to vote on two proposals:

•	Proposal 1—the election of two Class III directors to hold office until our 2024 annual meeting of stockholders; and

•	Proposal 2—the ratification of the selection, by the audit committee of our board of directors, of Ernst & Young LLP, as our independent registered public accounting firm for the year ending December 31, 2021

In addition, you are entitled to vote on any other matters that are properly brought before the Annual Meeting.

How do I attend the Virtual Annual Meeting?

This year’s Annual Meeting will be held entirely online to allow greater participation and improved communication and provide cost savings for our stockholders and the Company. Stockholders of record as of April 21, 2021 will be able to attend and participate in the Annual Meeting online by accessing www.virtualshareholdermeeting.com/GRTS2021. To join the Annual Meeting, you will need to have your 16-digit control number which is included on your Notice of Internet Availability of Proxy Materials and your proxy card.

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Even if you plan to attend the Annual Meeting online, we recommend that you also vote by proxy as described herein so that your vote will be counted if you decide not to attend the Annual Meeting.

How do I vote?

•	For Proposal 1, you may either vote “For” or “Withhold” your vote from any of the nominees of the board of directors.

•	For Proposal 2, you may either vote “For” or “Against” or abstain from voting.

Please note that by casting your vote by proxy you are authorizing the individuals listed on the Proxy Card to vote your shares in accordance with your instructions and in their discretion with respect to any other matter that properly comes before the Annual Meeting or any adjournments or postponements thereof.

The procedures for voting are as follows:

Stockholder of Record: Shares Registered in Your Name

If you are a stockholder of record, you may vote at the Annual Meeting. Alternatively, you may vote by proxy by using the accompanying Proxy Card, over the internet or by telephone. Whether or not you plan to attend the Annual Meeting online, we encourage you to vote by proxy to ensure your vote is counted. Even if you have submitted a proxy before the Annual Meeting, you may still attend the Annual Meeting and vote online. In such case, your previously submitted proxy will be disregarded.

•	To vote at the Annual Meeting, attend the Annual Meeting online and follow the instructions posted at www.virtualshareholdermeeting.com/GRTS2021.

•	To vote using the Proxy Card, simply complete, sign and date the accompanying Proxy Card and return it promptly in the envelope provided. If you return your signed Proxy Card before the Annual Meeting, we will vote your shares in accordance with the Proxy Card.

•	To vote by proxy over the internet, follow the instructions provided on the Notice of Internet Availability.

•	To vote by telephone, you may vote by proxy by calling the toll free number found on the Notice of Internet Availability.

Beneficial Owner: Shares Registered in the Name of Broker, Bank or Other Agent

If you are a beneficial owner of shares registered in the name of your broker, bank or other agent, you should have received a voting instruction card and voting instructions with these proxy materials from that organization rather than from us. Simply complete and mail the voting instruction card to ensure that your vote is counted. To vote at the Annual Meeting, you must obtain a valid proxy from your broker, bank or other agent. Follow the instructions from your broker, bank or other agent included with these proxy materials, or contact your broker, bank or other agent to request a proxy form.

We provide internet proxy voting to allow you to vote your shares online before the Annual Meeting takes place, with procedures designed to ensure the authenticity and correctness of your proxy vote instructions. However, please be aware that you must bear any costs associated with your internet access, such as usage charges from internet access providers and telephone companies.

Who counts the votes?

We have engaged Broadridge Financial Solutions, Inc. (“Broadridge”) as our independent agent to tabulate stockholder votes, or Inspector of Election. If you are a stockholder of record, your executed Proxy Card is returned directly to Broadridge for tabulation. As noted above, if you hold your shares through a broker, your broker returns one Proxy Card to Broadridge on behalf of all its clients.

How are votes counted?

With respect to the election of directors (Proposal 1), you may vote “for” or “withhold” authority to vote for each of the nominees for the board of directors. If you “withhold” authority to vote with respect to one or more director nominees, your vote will have no effect on the election of such nominees. Broker non-votes will have no effect on the election of the nominees.

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With respect to the ratification of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2021 (Proposal 2), you may vote “for,” “against” or “abstain.” If you “abstain” from voting with respect to this proposal, your vote will have the same effect as a vote “against” the proposal. As explained below, broker non-votes will have no effect on the vote for this proposal.

Votes will be counted by the Inspector of Election appointed for the Annual Meeting, who will separately count “For” and, with respect to Proposal 2, “Against” votes, abstentions and broker non-votes. If your shares are held by your broker as your nominee (that is, in “street name”), you will need to obtain a proxy form from the institution that holds your shares and follow the instructions included on that form regarding how to instruct your broker to vote your shares. If you do not give instructions to your broker, your broker can vote your shares with respect to “routine” items, but not with respect to “non-routine” items. See below for more information regarding: “What are “broker non-votes”?” and “Which ballot measures are considered “routine” or “non-routine”?”

What are “broker non-votes”?

Broker non-votes occur when a beneficial owner of shares held in “street name” does not give instructions to the broker or nominee holding the shares as to how to vote on matters deemed “non-routine.” Generally, if shares are held in street name, the beneficial owner of the shares is entitled to give voting instructions to the broker or nominee holding the shares. If the beneficial owner does not provide voting instructions, the broker or nominee can still vote the shares with respect to matters that are considered to be “routine,” but not with respect to “non-routine” matters. In the event that a broker, bank, custodian, nominee or other record holder of common stock indicates on a proxy that it does not have discretionary authority to vote certain shares on a particular proposal, then those shares will be treated as broker non-votes with respect to that proposal. Accordingly, if you own shares through a nominee, such as a broker or bank, please be sure to instruct your nominee how to vote to ensure that your vote is counted on each of the proposals.

Which ballot measures are considered “routine” or “non-routine”?

The ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2021 (Proposal 2) is considered routine under applicable rules. A broker or other nominee may generally vote on routine matters, and therefore no broker non-votes are expected to exist in connection with Proposal 2. The election of directors (Proposal 1) is considered non-routine under applicable rules. A broker or other nominee cannot vote without instructions on non-routine matters, and therefore there may be broker non-votes on Proposal 1.

How many votes are needed to approve the proposal?

Election of Directors (Proposal 1)—Directors shall be elected by a plurality of the votes cast (meaning that the two director nominees who receive the highest number of shares voted “For” their election are elected). “Withhold” votes and broker non-votes are not considered votes cast for the foregoing purpose and will have no effect on the election of the nominees.

Ratification of Independent Registered Public Accounting Firm (Proposal 2)—The ratification of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2021 requires the affirmative vote of the majority of the votes cast (meaning the number of shares voted “for” the proposal must exceed the number of shares voted “against” the proposal). Abstentions and broker non-votes are not considered votes cast for the foregoing purpose and will have no effect on the vote for this proposal.

How many votes do I have?

On each matter to be voted upon, you have one vote for each share of common stock you own as of the Record Date.

What if I return a Proxy Card but do not make specific choices?

If we receive a signed and dated Proxy Card and the Proxy Card does not specify how your shares are to be voted, your shares will be voted “For” the election of each of the two nominees for director, and “For” the ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm. If any other matter is properly presented at the Annual Meeting, your proxy (one of the individuals named on your Proxy Card) will vote your shares in his or her discretion.

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Who is paying for this proxy solicitation?

We will pay for the entire cost of soliciting proxies. In addition to these mailed proxy materials, our directors, officers and employees may also solicit proxies in person, by telephone or by other means of communication. Directors, officers and employees will not be paid any additional compensation for soliciting proxies. We may also reimburse brokerage firms, banks and other agents for the cost of forwarding proxy materials to beneficial owners.

What does it mean if I receive more than one set of materials?

If you receive more than one set of materials, your shares are registered in more than one name or are registered in different accounts. In order to vote all the shares you own, you must either sign and return all of the Proxy Cards or follow the instructions for any alternative voting procedure on each of the Proxy Cards.

Can I change my vote after submitting my proxy?

Yes. You can revoke your proxy at any time before the final vote at the Annual Meeting. If you are the record holder of your shares, you may revoke your proxy in any one of three ways:

•	You may submit another properly completed proxy, bearing a date later than the date of the original proxy.

•	You may send a written notice, bearing a date later than the date of the original proxy, that you are revoking your proxy to our Corporate Secretary at 5959 Horton Street, Suite 300, Emeryville, CA 94608.

•	You may attend the Annual Meeting online and vote by following the instructions at www.virtualshareholdermeeting.com/GRTS2021. Simply attending the Annual Meeting online will not, by itself, revoke your proxy.

If your shares are held in “street name” by your broker, bank or other agent, you should follow the instructions provided by them to change your vote.

When are stockholder proposals due for next year’s Annual Meeting?

To be considered for inclusion in next year’s proxy materials, your proposal must be submitted in writing by December 24, 2021, to our Corporate Secretary at our principal executive offices; provided that, if the date of the annual meeting is more than 30 days from June 18, 2022, the deadline is a reasonable time before we begin to print and send our proxy materials for next year’s annual meeting. Pursuant to the bylaws, in order for a stockholder to present a proposal for next year’s annual meeting, other than proposals to be included in the proxy statement as described above, or to nominate a director, you must do so between February 18, 2022 and March 20, 2022; provided that if the date of that annual meeting is more than 30 days before or more than 60 days after June 18, 2022, you must give notice not later than the 90^th day prior to the annual meeting date or, if later, the 10^th day following the day on which public disclosure of the annual meeting date is first made. You are also advised to review our bylaws, which contain additional requirements about advance notice of stockholder proposals and director nominations.

What is the quorum requirement?

A quorum of stockholders is necessary to hold a valid meeting. A quorum will be present if the holders of a majority in voting power of the shares of common stock issued and outstanding and entitled to vote are present in attendance online or represented by proxy at the Annual Meeting. On the Record Date, there were 49,197,828 shares outstanding and entitled to vote. Accordingly, 24,598,915 shares must be represented by stockholders present at the Annual Meeting online or by proxy to have a quorum.

Your shares will be counted toward the quorum only if you submit a valid proxy or vote at the Annual Meeting. Abstentions and “Withhold” votes will be counted toward the quorum requirement. If there is no quorum, either the chair of the Annual Meeting or a majority in voting power of the stockholders entitled to vote at the Annual Meeting, in attendance online or represented by proxy, may adjourn the Annual Meeting to another time or place.

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How can I find out the results of the voting at the Annual Meeting?

Voting results will be announced by the filing of a Current Report on Form 8-K within four business days after the Annual Meeting. If final voting results are unavailable at that time, we will file an amended Current Report on Form 8-K within four business days of the day the final results are available.

Implications of being an “emerging growth company.”

We are an “emerging growth company” as that term is used in the Jumpstart Our Business Startups Act of 2012 and, as such, have elected to comply with certain reduced public company reporting requirements. These reduced reporting requirements include reduced disclosure about our executive compensation arrangements and no non-binding advisory votes on executive compensation. We will remain an emerging growth company until the earlier of: (1) December 31, 2023, (2) the last day of the fiscal year in which we have total annual gross revenue of at least $1.07 billion, (3) the last day of the fiscal year in which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, which would occur if the market value of our common stock held by non-affiliates exceeded $700.0 million as of the last business day of the second fiscal quarter of such year or (4) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period.

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PROPOSAL NO. 1

ELECTION OF DIRECTORS

Our board of directors is divided into three classes. Each class consists, as nearly as possible, of one-third of the total number of directors, and each class has a staggered, three-year term. Unless the board of directors determines that vacancies (including vacancies created by increases in the number of directors) shall be filled by the stockholders, and except as otherwise provided by law, vacancies on the board of directors may be filled only by the affirmative vote of a majority of the remaining directors. A director elected by the board of directors to fill a vacancy (including a vacancy created by an increase in the number of directors) shall serve for the remainder of the full term of the class of directors in which the vacancy occurred and until such director’s successor is elected and qualified.

The board of directors currently consists of seven seated directors, divided into the three following classes:

•	Class I directors: Andrew Allen, M.D., Ph.D. and Judith Li, whose current terms will expire at the annual meeting of stockholders to be held in 2022;

•	Class II directors: Richard Heyman, Ph.D., Thomas Woiwode, Ph.D., and Nicholas Simon, whose current terms will expire at the annual meeting of stockholders to be held in 2023; and

•	Class III directors: Steve Krognes and Elaine Jones, Ph.D., whose current terms will expire at the Annual Meeting.

At each annual meeting of stockholders, the successors to directors whose terms will then expire will be elected to serve from the time of election and qualification until the third subsequent annual meeting of stockholders.

Steve Krognes and Dr. Elaine Jones have been nominated to serve as Class III directors and have each elected to stand for reelection. Each director to be elected will hold office from the date of their election by the stockholders until the third subsequent annual meeting of stockholders or until his or her successor is elected and has been qualified, or until such director’s earlier death, resignation or removal.

Shares represented by executed proxies will be voted, if authority to do so is not withheld, for the election of the two nominees named below. In the event that any nominee should be unavailable for election as a result of an unexpected occurrence, such shares will be voted for the election of such substitute nominee as the board of directors may propose. Each person nominated for election has agreed to serve if elected, and management has no reason to believe that any nominee will be unable to serve. Directors are elected by a plurality of the votes cast at the meeting.

The following table sets forth, for the Class III nominees (who are currently standing for re-election) and for our other current directors who will continue in office after the Annual Meeting, information with respect to their ages as of April 21, 2021 and position/office held within the Company:

Name	Age	Position/Office Held With the Company	Director Since
Class I Directors whose terms expire at the 2022 Annual Meeting of Stockholders
Andrew Allen, M.D., Ph.D.	54	President, Chief Executive Officer and Director	2015
Judith Li⁽¹⁾	37	Director	2017

Class II Directors whose terms expire at the 2023 Annual Meeting of Stockholders
Richard Heyman, Ph.D.⁽¹⁾⁽²⁾	63	Director	2015
Thomas Woiwode, Ph.D.⁽¹⁾⁽²⁾	49	Director	2015
Nicholas Simon⁽³⁾	67	Director	2015

Class III Directors whose terms expire at the Annual Meeting
Steve Krognes⁽²⁾⁽³⁾	52	Director	2018
Elaine Jones, Ph.D.⁽³⁾	66	Director and Chair of the Board of Directors	2020

(1)	Member of the nominating and corporate governance committee.

(2)	Member of the compensation committee.

(3)	Member of the audit committee.

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Set forth below is biographical information for the nominees and each person whose term of office as a director will continue after the Annual Meeting. The following includes certain information regarding our directors’ individual experience, qualifications, attributes and skills that led the board of directors to conclude that they should serve as directors.

Nominees for Election to a Three-Year Term Expiring at the 2024 Annual Meeting of Stockholders

Steve Krognes has served as a member of our board of directors since July 2018. Mr. Krognes has served as chief financial officer of Denali Therapeutics Inc. (“Denali”) since October 2015. Mr. Krognes joined Denali from Genentech, where he served as chief financial officer and a member of the executive committee from April 2009 to September 2015. Mr. Krognes also oversaw Genentech’s site services organization between 2011 and 2015, and Genentech’s information technology organization between 2009 and 2011. He chaired the Genentech Access to Care Foundation between 2009 and 2015. From January 2004 to April 2009, Mr. Krognes served as head of mergers and acquisitions and a member of the finance executive committee at Roche, a Swiss biotechnology company. From July 2002 to December 2003, Mr. Krognes served as director of mergers and acquisitions at Danske Bank, based in Norway. From April 2000 to June 2002, he was a venture capitalist with Pylonia Ventures, a Swedish venture investments company. Prior to that, Mr. Krognes worked as a consultant at McKinsey & Company and an investment banker at Goldman Sachs, based in London and Boston. Mr. Krognes currently serves as a member of the boards of directors of Corvus Pharmaceuticals, a publicly traded biopharmaceutical company, and RLS Global AB, a Swedish life sciences company. Mr. Krognes served as a board member of the California Life Sciences Association between 2010 and 2015, and the California Academy of Sciences, a private scientific and educational institution, between 2014 and 2018. He received his M.B.A. from Harvard Business School and his B.S. in economics from the Wharton School of the University of Pennsylvania. We believe that Mr. Krognes is qualified to serve on our board of directors due to his experience as a board member and senior executive of biotechnology and pharmaceutical companies.

Elaine Jones, Ph.D. has served as a member and chair of our board of directors since May 2020. Previously, Dr. Jones was a Vice President, Worldwide Business Development and Senior Partner at Pfizer Ventures, the venture capital arm of Pfizer Inc., from 2008, when she joined as an Executive Director, until her retirement in April 2019. At Pfizer Ventures, Dr. Jones was responsible for making and managing venture investments for Pfizer as well as serving on the boards of directors of several biotechnology platform and therapeutic companies. Prior to this, Dr. Jones held the position of General Partner at EuclidSR Partners, a venture firm specializing in investment in private and public equity within the health sciences, healthcare, and biopharmaceutical sectors, until 2008. Dr. Jones began her investment career at S.R. One, the corporate investment fund of GlaxoSmithKline, where she served from 1999 to 2003. Prior to this, Dr. Jones served as Director of Scientific Licensing at SmithKline Beecham and as a research scientist in the Research and Development division of SmithKline Beecham Pharmaceuticals. During her venture career, Dr. Jones has served on the boards of directors of more than 20 early to mid-stage biotechnology, therapeutic and pharmaceutical companies. Dr. Jones currently serves as Chair of Mironid Limited, a private drug discovery company, and as a member of the board of directors of Myeloid Therapeutics, Inc., a private immunology company. Dr. Jones also currently serves as a member of the boards of directors of the publicly traded biopharmaceutical companies, CytomX Therapeutics, Inc. and NextCure, Inc., and of Ibere Pharmaceuticals, a publicly listed blank check company formed for the purpose of effecting a merger in the pharmaceutical and life sciences industries. Dr. Jones holds a B.S. in biology from Juniata College and a Ph.D. in microbiology from the University of Pittsburgh. We believe that Dr. Jones is qualified to serve on our board of directors due to her educational background, her knowledge of the pharmaceutical industry, her experience as a board member of biotechnology and pharmaceutical companies, and her experience as an investor in new life sciences companies.

THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”

THE ELECTION OF EACH NAMED NOMINEE.

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Directors Continuing in Office Until the 2022 Annual Meeting of Stockholders

Andrew Allen, M.D., Ph.D. co-founded Gritstone Oncology, Inc. and has served as our President and Chief Executive Officer and a member of our board of directors since September 2015. Prior to Gritstone, in April 2009, Dr. Allen co-founded Clovis Oncology, Inc., a public pharmaceutical development company, and served as its executive vice president of clinical and preclinical development and chief medical officer from April 2009 to July 2015. Prior to that, he was chief medical officer at Pharmion Corporation from 2006 to 2008. Previously, Dr. Allen served in clinical development leadership roles at Chiron Corporation and Abbott Laboratories, and worked at McKinsey & Company, where he advised life science companies on strategic issues. He currently serves on the board of directors of Epizyme, Inc., a publicly traded biopharmaceutical company, Sierra Oncology, Inc., a publicly traded biopharmaceutical company, TCR2 Therapeutics Inc, a publicly traded biopharmaceutical company, and Revitope Inc., a privately-held biotechnology company. Dr. Allen previously served on the board of directors of Cell Design Labs, a private biotechnology company, from November 2015 until its acquisition by Gilead Sciences, Inc. in December 2017. Dr. Allen qualified in medicine at Oxford University and received a Ph.D. in immunology from Imperial College of Science, Technology and Medicine in London. We believe that Dr. Allen is qualified to serve on our board of directors due to his educational experience and his experience as a senior executive of biotechnology and pharmaceutical companies, including his service as our chief executive officer.

Judith Li has served as a member of our board of directors since September 2017. Ms. Li has served as a partner at Lilly Asia Ventures (“LAV”), which is based in Hong Kong and Shanghai and focuses on early and growth stage investments across biopharmaceuticals, medical devices, and diagnostics, both domestically and cross-border, since 2013. Judith is currently a board member of various LAV portfolio companies, including Tmunity Therapeutics, Scineuro Pharmaceuticals, and Fortis; as well as a former board member of EScape Bio and Veritas Genetics Inc. She has also previously served as a board director on public companies Inhibrx and Nextcure, Inc., and Crown BioScience Inc. Previously, Ms. Li served as a senior business analyst at McKinsey & Company, worked in hospital administration at Partners Healthcare, and co-founded an interventional nephrology medical device venture. Judith holds a B.A. in biology from Harvard and an M.B.A. from Harvard Business School. We believe that Ms. Li is qualified to serve on our board of directors due to her experience as a board member of biotechnology and pharmaceutical companies, and her experience as an investor in new life sciences companies.

Directors Continuing in Office Until the 2023 Annual Meeting of Stockholders

Richard Heyman, Ph.D. has served as a member of our board of directors since November 2015. Dr. Heyman is executive chairman and co-founder of Metacrine, Inc., a biotechnology company developing new therapeutics for the treatment of liver and gastrointestinal diseases. He also is the co-founder and chairman of ORIC Pharmaceuticals, which is developing drugs to overcome resistance in cancer. Previously, Dr. Heyman served as president and chief executive officer of Seragon Pharmaceuticals Inc. (“Seragon”), a privately-held biotechnology company, which was acquired by Genentech in 2014. Prior to Seragon, he co-founded and served as president and chief executive officer of Aragon Pharmaceuticals, Inc. until it was purchased by Johnson & Johnson in 2013. He has been involved in the discovery and development of multiple therapeutic agents approved by the FDA, including the recently approved prostate cancer drug, Erleada. Dr. Heyman is a venture partner for Arch Ventures and serves on the Board of Directors for Ymanity Therapeutics and Vividion Therapeutics. He is Vice Chair of the Board of Trustees at the Salk Institute, on the Board Foundation for the American Association for Cancer Research and on the executive committee at the University of California at San Diego Moores Cancer Center. He has won numerous awards, including Ernst and Young San Diego Regional Entrepreneur of the Year and the Endocrine Society Outstanding Innovation Award. Dr. Heyman received a B.S. in chemistry from the University of Connecticut and a Ph.D. in pharmacology from the University of Minnesota. He was an NIH post-doctoral fellow and staff scientist at the Salk Institute. We believe that Dr. Heyman is qualified to serve on our board of directors due to his educational background and his experience as a board member and senior executive of biotechnology and pharmaceutical companies.

Nicholas Simon has served as a member of our board of directors since September 2015. Mr. Simon is a Senior Managing Director in the Blackstone Life Sciences group, having joined Blackstone as part of its acquisition of Clarus Ventures, LLC (“Clarus”) in December of 2018. Prior to joining Blackstone, Mr. Simon was co-founder and Managing Director of Clarus, a venture capital firm focused on life sciences companies, since the firm’s inception in 2005. Prior to Clarus, Mr. Simon was a general partner at MPM Capital, Inc., a healthcare venture

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capital firm. He has more than 30 years of operating and investment experience in the biopharmaceutical industry, including serving as vice president of business and corporate development at Genentech from 1989 to 2000. In addition to Gritstone, Mr. Simon is currently chairman of the board of Sientra, Inc., a public medical aesthetics company. He has also been a member of the board of directors of numerous private and public life sciences companies, including Achillion Pharmaceuticals, Inc., Avanir Pharmaceuticals, Inc., Barrier Therapeutics, Inc., Biovitrum AB, CoTherix, Inc., InterMune, Inc., Lycera Corp., Nuvelution Pharma, Inc., Pearl Therapeutics Inc., QuatRx Pharmaceuticals Co., Rigel Pharmaceuticals, Inc., and Sangstat Medical Corporation. Mr. Simon is also a trustee at the Gladstone Institute, a private not-for-profit research institute affiliated with the University of California, San Francisco. Mr. Simon received a B.S. in microbiology from the University of Maryland and an M.B.A. from Loyola University. We believe that Mr. Simon is qualified to serve on our board of directors due to his experience as a board member of biotechnology and pharmaceutical companies, and his experience as an investor in new life sciences companies.

Thomas Woiwode, Ph.D. has served as a member of our board of directors since September 2015. Since 2002, Dr. Woiwode has served in various investment and operational roles at Versant Venture Management, LLC (“Versant Ventures”), a healthcare investment firm, including Managing Director since July 2014 and a Venture Partner from 2011 to 2014. From 2011 to 2013, Dr. Woiwode served as Chief Operating Officer of Okarios AG, a biopharmaceutical company. Previously, Dr. Woiwode co-founded EuroVentures, a wholly-owned biotechnology incubator within Versant Ventures, and, in this role, served as the founding Chief Business Officer for three biotechnology portfolio companies. Prior to Versant Ventures, Dr. Woiwode served as a Research Scientist at XenoPort, Inc., a biotechnology company. Dr. Woiwode currently serves on the boards of directors of Adverum Biotechnologies, Inc., Aligos Therapeutics, Inc. and Passage Bio, Inc., as well as several private companies. Dr. Woiwode previously served on the board of directors of Audentes Therapeutics, Inc. and Crispr Therapeutics AG, both public biotechnology companies. Dr. Woiwode received a B.A. in English and a B.S. in Chemistry from the University of California, Berkeley and a Ph.D. in Organic Chemistry as an NSF Fellow from Stanford University. We believe that Dr. Woiwode is qualified to serve on our board of directors due to his educational background, his experience as a board member and senior executive of biotechnology and pharmaceutical companies, and his experience as an investor in new life sciences companies.

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PROPOSAL NO. 2

RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The audit committee of our board of directors has engaged Ernst & Young LLP (“EY”), as our independent registered public accounting firm for the year ending December 31, 2021, and is seeking ratification of such selection by our stockholders at the Annual Meeting. EY has audited our financial statements for each of our fiscal years since the fiscal year ended December 31, 2015. Representatives of EY are expected to be in attendance online at the Annual Meeting. They will have an opportunity to make a statement if they so desire and will be available to respond to appropriate questions.

Nothing in our bylaws or other governing documents, or in any applicable law, requires stockholder ratification of the selection of EY as our independent registered public accounting firm. However, the audit committee is submitting the selection of EY to our stockholders for ratification as a matter of good corporate practice. If our stockholders fail to ratify the selection, the audit committee will reconsider whether or not to retain EY. Even if the selection is ratified, the audit committee in its discretion may direct the appointment of a different independent registered public accounting firm at any time during the year if they determine that such a change would be in the best interests of the Company and our stockholders.

Principal Accountant Fees and Services

The following table provides information regarding the fees incurred to EY during the years ended December 31, 2020 and 2019. The audit committee approved all of the fees described below incurred since our initial public offering (“IPO”) in October 2018.

	Year Ended December 31,
	2020	2019
Audit Fees⁽¹⁾	$949,000	$1,200,000
Audit-Related Fees⁽²⁾	—	—
Tax Fees⁽³⁾	—	—
All Other Fees⁽⁴⁾	4,000	3,000
Total Fees	$953,000	$1,203,000

(1)	Audit fees are fees for professional services for the audit of the Company’s 2020 and 2019 financial statements, the review of quarterly financial statements, and for services that are normally provided by the accountant in connection with other statutory and regulatory filings or engagements.

(2)	Audit-related fees are fees for assurance and related services that are reasonably related to the performance of the audit or review of a company’s financial statements.

(3)	Tax fees are fees for tax compliance, tax advice and tax planning.

(4)	Represents fees related to accessing Ernst & Young LLP’s online research database.

Pre-Approval Policies and Procedures

The audit committee, or a delegate of the audit committee, pre-approves, or provides pursuant to pre-approvals, policies and procedures for the pre-approval of, all audit and non-audit services provided by its independent registered public accounting firm. This policy is set forth in the charter of the audit committee and is available at http://www.gritstone.com.

The audit committee approved all of the audit, audit-related, tax and other services provided by EY for 2019 and all of the audit, audit-related, tax and other services provided by EY in 2020 and, in each case, the estimated costs of those services. Actual amounts billed, to the extent in excess of the estimated amounts, are periodically reviewed and approved by the audit committee.

THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”

THE RATIFICATION OF OUR INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.

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REPORT OF THE AUDIT COMMITTEE OF THE BOARD OF DIRECTORS

The material in this report is not “soliciting material,” is not deemed “filed” with the SEC and is not to be incorporated by reference into any filing of Gritstone under the Securities Act of 1933, as amended (the “Securities Act”), or the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

The primary purpose of the audit committee is to oversee our financial reporting processes on behalf of our board of directors. The audit committee’s functions are more fully described in its charter, which is available on our website at http://www.gritstone.com. Management has the primary responsibility for our financial statements and reporting processes, including our systems of internal controls. In fulfilling its oversight responsibilities, the audit committee reviewed and discussed with management Gritstone’s audited financial statements as of and for the year ended December 31, 2020.

The audit committee has discussed with Ernst & Young LLP (“EY”), the Company’s independent registered public accounting firm, the matters required to be discussed by the applicable requirements of the Public Company Accounting Oversight Board (“PCAOB”) and the Securities and Exchange Commission (“SEC”). In addition, the audit committee discussed with EY their independence and received from EY the written disclosures and the letter required by Ethics and Independence Rule 3526 of the PCAOB. Finally, the audit committee discussed with EY, with and without management present, the scope and results of EY’s audit of such financial statements.

Based on these reviews and discussions, the audit committee has recommended to our board of directors that such audited financial statements be included in our Annual Report on Form 10-K for the year ended December 31, 2020 for filing with the SEC. The audit committee also has engaged EY as our independent registered public accounting firm for the fiscal year ending December 31, 2021 and is seeking ratification of such selection by the stockholders.

Audit Committee

Steve Krognes, Chair

Nicholas Simon

Elaine Jones, Ph.D.

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CORPORATE GOVERNANCE

Code of Business Conduct and Ethics

We have adopted a code of business conduct and ethics that applies to all of our employees, officers and directors, including those officers responsible for financial reporting. The code of business conduct and ethics is available on our website at http://www.gritstone.com. Any amendments to the code, or any waivers of its requirements, will be disclosed on our website.

Corporate Governance Guidelines

We believe in sound corporate governance practices and have adopted formal corporate governance guidelines to enhance our effectiveness. Our board of directors adopted these corporate governance guidelines in order to ensure that it has the necessary practices in place to review and evaluate our business operations as needed and to make decisions that are independent of our management. The corporate governance guidelines are also intended to align the interests of directors and management with those of our stockholders. The corporate governance guidelines set forth the practices our board of directors follows with respect to board of directors and committee composition and selection, meetings of the board of directors, Chief Executive Officer performance evaluation and succession planning. A copy of our corporate governance guidelines is available on our website at http://www.gritstone.com.

Independence of the Board of Directors

As required under the Nasdaq Global Select Market (“Nasdaq”) rules and regulations, a majority of the members of a listed company’s board of directors must qualify as “independent,” as affirmatively determined by such board. The board of directors consults with the Company’s counsel to ensure that the board of directors’ determinations are consistent with all relevant securities and other laws and regulations regarding the definition of “independent,” including those set forth in pertinent Nasdaq listing standards, as in effect from time to time.

Consistent with these considerations, our board of directors has determined that all of our directors, other than Dr. Allen, qualify as “independent” directors in accordance with the Nasdaq listing requirements. Dr. Allen is not considered independent because he is an employee of Gritstone. The Nasdaq independence definition includes a series of objective tests, such as that the director is not, and has not been for at least three years, one of our employees and that neither the director nor any of his or her family members has engaged in various types of business dealings with us. In addition, as required by Nasdaq rules, our board of directors has made a subjective determination as to each independent director that no relationships exist, which, in the opinion of our board of directors, would interfere with the exercise of independent judgment in carrying out the responsibilities of a director. In making these determinations, our board of directors considered information provided by the directors and us with regard to each director’s business and personal activities and relationships as they may relate to us and our management. There are no family relationships among any of our directors or executive officers.

As required under Nasdaq rules and regulations, our independent directors meet in regularly scheduled executive sessions at which only independent directors are present. All of the committees of our board of directors are comprised entirely of directors determined by the board of directors to be independent within the meaning of Nasdaq and SEC rules and regulations applicable to the members of such committees.

Leadership Structure of the Board

Our bylaws and corporate governance guidelines provide our board of directors with flexibility to combine or separate the positions of chair of the board of directors and Chief Executive Officer and to implement a lead director in accordance with its determination that utilizing one or the other structure would be in the best interests of the Company. In the past, while we may not have formally appointed a chair or lead independent director, the board of directors generally did have an independent director preside over its executive sessions and act as a liaison between management and the board of directors. Since May 2020, Elaine V. Jones, Ph.D., has performed these functions as chair of our board of directors.

Our board of directors has concluded that our current leadership structure is appropriate at this time. However, our board of directors will continue to periodically review our leadership structure and may make such changes in the future as it deems appropriate.

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Role of Board in Risk Oversight Process

Risk assessment and oversight are an integral part of our governance and management processes. Our board of directors encourages management to promote a culture that incorporates risk management into our corporate strategy and day-to-day business operations. Management discusses strategic and operational risks at regular management meetings and conducts specific strategic planning and review sessions during the year that include a focused discussion and analysis of the risks facing us. Throughout the year, senior management reviews these risks with the board of directors at regular board meetings as part of management presentations that focus on particular business functions, operations or strategies and presents the steps taken by management to mitigate or eliminate such risks.

Our board of directors does not have a standing risk management committee, but rather administers this oversight function directly through our board of directors as a whole, as well as through various standing committees of our board of directors that address risks inherent in their respective areas of oversight. In particular, our board of directors is responsible for monitoring and assessing strategic risk exposure, and our audit committee is responsible for overseeing our major financial risk exposures and the steps our management has taken to monitor and control these exposures. The audit committee also monitors compliance with legal and regulatory requirements. Our nominating and governance committee monitors the effectiveness of our corporate governance guidelines and considers and approves or disapproves any related-person transactions. Our compensation committee assesses and monitors whether any of our compensation policies and programs has the potential to encourage excessive risk-taking.

Board Committees

Audit Committee

Our audit committee oversees our corporate accounting and financial reporting process. Among other matters, the audit committee:

•	appoints our independent registered public accounting firm;

•	evaluates the independent registered public accounting firm’s qualifications, independence and performance;

•	determines the engagement of the independent registered public accounting firm;

•	reviews and approves the scope of the annual audit and the audit fee;

•	discusses with management and the independent registered public accounting firm the results of the annual audit and the review of our quarterly financial statements;

•	approves the retention of the independent registered public accounting firm to perform any proposed permissible non-audit services;

•	monitors the rotation of partners of the independent registered public accounting firm on our engagement team in accordance with requirements established by the SEC;

•	is responsible for reviewing our financial statements and our management’s discussion and analysis of financial condition and results of operations to be included in our annual and quarterly reports to be filed with the SEC;

•	reviews our critical accounting policies and estimates;

•	reviews all related party transactions on an ongoing basis;

•	establishes procedures for the receipt, retention and treatment of complaints received by us regarding accounting, internal controls or auditing matters;

•	annually reviews and assesses treasury functions, including cash management process;

•	discusses on a periodic basis, or as appropriate, with management our policies, programs and controls with respect to risk assessment and risk management;

•	reviews our compliance and ethics programs, including legal and regulatory requirements;

•	consults with management to establish procedures and internal controls relating to cybersecurity;

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•	reviews management’s report on its assessment of the effectiveness of internal control over financial reporting and any changes thereto;

•	investigates any matters received, and reports to the Board periodically, with respect to ethics issues, complaints and associated investigations; and

•	reviews the audit committee charter and the committee’s performance at least annually.

During 2020, the members of our audit committee were Messrs. Krognes and Simon and Dr. Jones, all of whom continue to serve on the committee. Mr. Krognes serves as the chairperson of the committee. All members of our audit committee meet the requirements for financial literacy under the applicable rules and regulations of the SEC and Nasdaq. Our board of directors has determined that Mr. Krognes is an audit committee financial expert as defined under the applicable rules of the SEC and has the requisite financial sophistication as defined under the applicable rules and regulations of Nasdaq. Under the rules of the SEC, members of the audit committee must also meet heightened independence standards. Our board of directors has determined that each of the members of our audit committee is independent under the applicable rules of the SEC and Nasdaq. The audit committee operates under a written charter that satisfies the applicable standards of the SEC and Nasdaq. A copy of the audit committee charter is available on the Company’s website at http://www.gritstone.com.

Compensation Committee

Our compensation committee oversees policies relating to compensation and benefits of our officers and employees other than our Chief Executive Officer, with respect to whom our board of directors retains the authority to make compensation decisions. The compensation committee reviews and approves or recommends corporate goals and objectives relevant to compensation of our executive officers (other than our Chief Executive Officer), evaluates the performance of these officers in light of those goals and objectives and approves the compensation of these officers based on such evaluations. The compensation committee also reviews and approves or makes recommendations to our board of directors regarding the issuance of stock options and other awards under our stock plans to our executive officers (other than our Chief Executive Officer). The compensation committee also reviews the performance of our Chief Executive Officer and makes recommendations to our board of directors with respect to his compensation, while the board of directors as a whole makes any final decisions. The compensation committee will review and evaluate, at least annually, the performance of the compensation committee and its members, including compliance by the compensation committee with its charter. The current members of our compensation committee are Drs. Woiwode and Heyman and Mr. Krognes. Dr. Woiwode serves as the chairperson of the committee. Each of the members of our compensation committee is independent under the applicable rules and regulations of Nasdaq and is a “non-employee director” as defined in Rule 16b-3 promulgated under the Exchange Act. The compensation committee operates under a written charter that satisfies the applicable standards of the SEC and Nasdaq. A copy of the compensation committee charter is available on the Company’s website at http://www.gritstone.com.

Our compensation committee has retained Radford, Inc. (“Radford”), a national compensation consulting firm, to serve as its independent compensation consultant and to conduct market research and analysis on our various executive positions, to assist the committee in developing appropriate incentive plans for our executives on an annual basis, to provide the committee with advice and ongoing recommendations regarding material executive compensation decisions, and to review compensation proposals of management. Radford reports directly to the compensation committee and does not provide any non-compensation related services to the Company. The compensation committee reviewed the independence of Radford, employing the independence factors specified in the listing requirements of Nasdaq. Based on this assessment, the compensation committee determined that the engagement of Radford does not raise any conflicts of interest or similar concerns. In addition, the compensation committee evaluated the independence of its other outside advisors, including outside legal counsel, considering the same independence factors, and concluded that their work for the compensation committee does not raise any conflicts of interest.

Nominating and Corporate Governance Committee

The nominating and corporate governance committee is responsible for making recommendations to our board of directors regarding candidates for directorships and the size and composition of our board of directors. In addition, the nominating and corporate governance committee is responsible for overseeing our corporate governance policies and reporting and making recommendations to our board of directors concerning governance

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matters. The current members of our nominating and corporate governance committee are Drs. Heyman and Woiwode and Ms. Li. Ms. Li serves as the chairperson of the committee. Each of the members of our nominating and corporate governance committee is an independent director under the applicable rules and regulations of Nasdaq relating to nominating and corporate governance committee independence. The nominating and corporate governance committee operates under a written charter that satisfies the applicable standards of the SEC and Nasdaq. A copy of the nominating and corporate governance committee charter is available on the Company’s website at http://www.gritstone.com.

The nominating and corporate governance committee will consider director candidates recommended by stockholders. For a stockholder to make any nomination for election to the board of directors at an annual meeting, the stockholder must provide notice to the Company, which notice must be delivered to, or mailed and received at, the Company’s principal executive offices not less than 90 days and not more than 120 days prior to the one-year anniversary of the preceding year’s annual meeting; provided that, if the date of the annual meeting is more than 30 days before or more than 60 days after such anniversary date, the stockholder’s notice must be delivered, or mailed and received, not later than 90 days prior to the date of the annual meeting or, if later, the 10^th day following the date on which public disclosure of the date of such annual meeting is made. Further updates and supplements to such notice may be required at the times, and in the forms, required under our bylaws. As set forth in our bylaws, submissions must include the name and address of the proposed nominee, information regarding the proposed nominee that is required to be disclosed in a proxy statement or other filings in a contested election pursuant to Section 14(a) under the Exchange Act, information regarding the proposed nominee’s indirect and direct interests in shares of the Company’s common stock, and a completed and signed questionnaire, representation and agreement of the proposed nominee. Our bylaws also specify further requirements as to the form and content of a stockholder’s notice. We recommend that any stockholder wishing to make a nomination for director review a copy of our bylaws, as amended and restated to date, which is available, without charge, from our Corporate Secretary, at 5959 Horton Street, Suite 300, Emeryville, CA 94608.

Board Diversity

Our nominating and corporate governance committee is responsible for reviewing with the board of directors, on an annual basis, the appropriate characteristics, skills and experience required for the board of directors as a whole and its individual members. In evaluating the suitability of individual candidates (both new candidates and current members), the nominating and corporate governance committee, in recommending candidates for election, and the board of directors, in approving (and, in the case of vacancies, appointing) such candidates, may take into account many factors, including but not limited to the following:

•	personal and professional integrity;

•	ethics and values;

•	practical and mature business judgment;

•	experience in corporate management, such as serving as an officer or former officer of a publicly held company;

•	professional and academic experience relevant to our industry;

•	experience as a board member of another publicly held company;

•	experience in finance and accounting and / or executive compensation practices;

•	diversity of expertise and experience in substantive matters pertaining to our business relative to other board members;

•	geographic background, gender, age and ethnicity; and

•	potential or actual conflicts of interest.

Currently, our board of directors evaluates each individual in the context of the board of directors as a whole, with the objective of assembling a group that can best maximize the success of the business and represent stockholder interests through the exercise of sound judgment using its diversity of experience in these various areas.

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Meetings of the Board of Directors, Board and Committee Member Attendance and Annual Meeting Attendance

During 2020, our board of directors met twelve times, the audit committee met four times, the compensation committee met four times and the nominating and corporate governance committee met four times. During 2020, each member of the board of directors attended at least 75% of the meetings of the board of directors and of the committees of the board of directors on which he or she served. We encourage all of our directors and nominees for director to attend our annual meeting of stockholders.

Stockholder Communications with the Board of Directors

Should stockholders wish to communicate with the board of directors or any specified individual director, such correspondence should be sent to the attention of the Corporate Secretary, at 5959 Horton Street, Suite 300, Emeryville, CA 94608. The Corporate Secretary will forward the communication to the board of directors.

Compensation Committee Interlocks and Insider Participation

During the year ended December 31, 2020, Thomas Woiwode, Ph.D., Richard Heyman, Ph.D., and Steve Krognes served as members of our compensation committee, and they continue to serve in that capacity. None of them has at any time been one of our officers or employees. None of our executive officers currently serves, or in the past fiscal year has served, as a member of the board of directors or compensation committee of any entity that has one or more executive officers on our board of directors or compensation committee.

Derivatives Trading, Hedging, and Pledging Policies

Our Insider Trading Compliance Policy prohibits our officers, directors, employees and specified consultants (and members of their immediate family or household) from engaging in hedging transactions involving our equity securities, including but not limited to zero-cost collars and forward sale contracts, and from engaging in short sales or transactions in puts, calls, or other derivative securities involving Gritstone’s equity securities. In addition, our Insider Trading Compliance Policy prohibits these individuals from pledging Gritstone securities as collateral to secure loans. This prohibition means, among other things, that these individuals may not hold Gritstone securities in a “margin account,” which would allow the individual to borrow against their holdings to buy securities.

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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

The following is a description of transactions since January 1, 2020 to which we have been a party, in which the amount involved exceeds $120,000, and in which any of our directors, executive officers or beneficial owners of more than 5% of our capital stock, or an affiliate or immediate family member thereof, had or will have a direct or indirect material interest.

PIPE Financing

In December 2020, we entered into private placement transactions (the “PIPE Financing”) with certain existing and new investors, including certain beneficial owners of more than 5% of our capital stock and entities affiliated with certain of our directors. Pursuant to this PIPE Financing, we sold (i) an aggregate of 5,543,351 shares of common stock at a per share purchase price of $3.34, (ii) pre-funded warrants to purchase an aggregate of 27,480,719 shares of common stock, each with an exercise price of $3.34 per share of common stock (of which $3.33 per share was pre-paid by each purchaser), and (iii) an aggregate of 4,043,127 shares of common stock at a per share purchase price of $3.71. The aggregate gross cash proceeds to Gritstone for the securities sold in this PIPE Financing was $125.0 million. The table below sets forth the number of shares of common stock and shares of common stock subject to pre-funded warrants sold to owners of more than 5% of our capital stock, or an affiliate or immediate family member thereof:

Name	Shares of Common Stock	Shares of Common Stock Issuable Upon Exercise of Pre-Funded Warrants	Total Purchase Price ($)
Entities affiliated with Redmile Group, LLC⁽¹⁾	—	15,060,000	$50,149,800
Entities affiliated with EcoR1 Capital Fund⁽²⁾	3,421,287	5,560,748	$29,944,389
Entities affiliated with Avidity Partners Management LP⁽³⁾	2,122,064	6,859,971	$29,931,397
Entities affiliated with Biotechnology Value Fund⁽⁴⁾	2,695,418	—	$10,000,000
Entities affiliated with Versant Ventures⁽⁵⁾	1,347,709	—	$5,000,000

(1)	Entities affiliated with Redmile Group, LLC were the beneficial owners of, in the aggregate, more than 5% of our capital stock at the time of the closing of the PIPE Financing.

(2)	Entities affiliated with EcoR1 Capital Fund were the beneficial owners of, in the aggregate, more than 5% of our capital stock at the time of the closing of the PIPE Financing.

(3)	Entities affiliated with Avidity Partners Management LP were the beneficial owners of, in the aggregate, more than 5% of our capital stock at the time of the closing of the PIPE Financing.

(4)	Entities affiliated with Biotechnology Value Fund were the beneficial owners of, in the aggregate, more than 5% of our capital stock at the time of the closing of the PIPE Financing.

(5)	Entities affiliated with Versant Ventures were the beneficial owners of, in the aggregate, more than 5% of our capital stock at the time of the closing of the PIPE Financing. Thomas Woiwode, Ph.D., who is a member of our board of directors, is an affiliate of Versant Ventures.

Director and Executive Officer Compensation

See “Executive Compensation” and “Director Compensation” for information regarding compensation of directors and executive officers.

Employment Agreements

We have entered into employment agreements with our executive officers. For more information regarding these agreements, see “Executive Compensation—Narrative to Summary Compensation Table and Outstanding Equity Awards at 2020 Fiscal Year End.”

Investors’ Rights Agreement

We have entered into an amended and restated investors’ rights agreement (the “IRA”) with the purchasers of our outstanding preferred stock and certain of our other stockholders, including entities with which certain of our directors are affiliated. As of December 31, 2020, the holders of approximately 3.1 million shares of our common stock are entitled to rights with respect to the registration of their shares under the Securities Act, pursuant to the IRA.

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Indemnification Agreements and Directors’ and Officers’ Liability Insurance

We have entered into indemnification agreements with each of our directors and executive officers. These agreements require us to, among other things, indemnify each director and executive officer to the fullest extent permitted by Delaware law, including indemnification of expenses such as attorneys’ fees, judgments, penalties fines and settlement amounts incurred by the director or executive officer in any action or proceeding, including any action or proceeding by or in right of us, arising out of the person’s services as a director or executive officer. We also have obtained an insurance policy that insures our directors and executive officers against certain liabilities, including liabilities arising under applicable securities laws.

Policies and Procedures for Related Person Transactions

Our board of directors has adopted a written related person transaction policy setting forth the policies and procedures for the review and approval or ratification of related person transactions. This policy covers, with certain exceptions set forth in Item 404 of Regulation S-K under the Securities Act, any transaction, arrangement or relationship, or any series of similar transactions, arrangements or relationships in which we were or are to be a participant, where the amount involved exceeds $120,000 (or the transaction is otherwise material based on the facts and circumstances) and a related person had or will have a direct or indirect material interest, including without limitation purchases of goods or services by or from the related person or entities in which the related person has a material interest, indebtedness, guarantees of indebtedness and employment by us of a related person. In reviewing and approving any such transactions, our audit committee is tasked to consider all relevant facts and circumstances, including but not limited to whether the transaction is on terms comparable to those that could be obtained in an arm’s length transaction with an unrelated third party and the extent of the related person’s interest in the transaction. Each transaction required to be reported under Item 404(a) of Regulation S-K since the beginning of last fiscal year was entered into in compliance with our related person transaction policy described above.

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EXECUTIVE OFFICERS

The executive officers of Gritstone are set forth below with their ages as of April 21, 2021:

Name	Age	Position(s)
Andrew Allen, M.D., Ph.D.	54	President, Chief Executive Officer and Director
Matthew Hawryluk, Ph.D.	43	Executive Vice President, Chief Business Officer
Erin Jones	49	Chief Operating Officer
Karin Jooss, Ph.D.	56	Executive Vice President of Research, Chief Scientific Officer
Raphaël Rousseau, M.D., Ph.D.	52	Executive Vice President, Chief Medical Officer
Rahsaan Thompson	50	Executive Vice President, General Counsel
Vijay Yabannavar, Ph.D.	60	Executive Vice President, Manufacturing and Technical Operations
Roman Yelensky, Ph.D.	42	Executive Vice President, Chief Technology Officer

Executive Officers

The following biographical information is furnished with regard to our executive officers (except for Dr. Allen, whose biographical information appears above under “Directors Continuing in Office Until the 2022 Annual Meeting of Stockholders”) as of April 21, 2021:

Matthew Hawryluk, Ph.D. has served as our Executive Vice President and Chief Business Officer since November 2015. Since March 2020, Dr. Hawryluk has served as an Advisory Board Member of PathAI, Inc. Prior to Gritstone, from April 2011 to October 2015, Dr. Hawryluk held positions of increasing responsibility at Foundation Medicine, Inc. (“Foundation Medicine”), then a public molecular diagnostics company (subsequently acquired by Roche), most recently serving as vice president, corporate and business development. Previously, he held roles in business development, marketing and product management across multiple divisions of Thermo Fisher Scientific, Inc. Dr. Hawryluk received a B.S. from the University of Notre Dame, a Ph.D. in cell biology and protein biochemistry from the University of Pittsburgh School of Medicine and an M.B.A. at Carnegie Mellon University’s Tepper School of Business as a Swartz Entrepreneurial Fellow.

Erin Jones has served as our Chief Operating Officer since March 2021 and previously as our Executive Vice President, Global Head of Regulatory Affairs and Quality Assurance from May 2016 to February 2021. Prior to Gritstone, from July 2014 to April 2016, Mr. Jones served as vice president, global head of regulatory affairs, medical writing, pharmacology and toxicology at Puma Biotechnology, Inc. (“Puma”), a public biopharmaceutical company. Prior to Puma, Mr. Jones served as director, regulatory affairs at BioMarin Pharmaceutical Inc. from July 2012 to July 2014. Earlier in his career, Mr. Jones held various positions at Genentech, Inc. (“Genentech”), a biotechnology corporation and subsidiary of Roche, including head of regulatory intelligence and leader of the HER Franchise Regulatory Group. Mr. Jones received a B.S. in microbiology and chemistry from the University of Pittsburgh and an M.S. in computer systems from Pennsylvania State University.

Karin Jooss, Ph.D. has served as our Executive Vice President of Research and Chief Scientific Officer since April 2016. Prior to Gritstone, from May 2009 to April 2016, Dr. Jooss served as head of cancer immuno-therapeutics in the vaccine immuno-therapeutics department at Pfizer, Inc. (“Pfizer”), a public pharmaceutical company, where she was also a member of the vaccine immuno-therapeutics leadership team and served as head of the immuno-pharmacology team. Prior to joining Pfizer, Dr. Jooss served as vice president of research at Cell Genesys, Inc. (“Cell Genesys”) from June 2005 to April 2009, and as senior director of research at Cell Genesys from July 2001 to June 2005. She is on the editorial board of Molecular Therapy and the Journal of Gene Medicine and is a member of the Immunology and Educational Committee of the American Society of Gene & Cell Therapy and the Industry Task Force of the Society for Immunotherapy of Cancer. Dr. Jooss has served on the board of directors of Fate Therapeutics, Inc., a publicly traded biopharmaceutical company, since March 2019. Dr. Jooss received her diploma in theoretical medicine from the University of Marburg in Germany, a Ph.D. in molecular biology and immunology from the University of Marburg in Germany and performed postgraduate work in gene therapy and immunology at the University of Pennsylvania.

Raphaël Rousseau, M.D., Ph.D. has served as our Executive Vice President, Chief Medical Officer since April 2017. Prior to Gritstone, from July 2012 to March 2017, Dr. Rousseau served as senior group medical director and global franchise head, pediatrics of Genentech. Before Genentech, Dr. Rousseau was senior medical director

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and lead of the pediatric global development team at Roche from October 2010 to June 2012, and international medical leader, hematology, at Roche from January 2009 to September 2010. Before joining Roche, Dr. Rousseau was a professor of medical and pediatric oncology at the Université Claude Bernard in Lyon, France. At the Léon Bérard Comprehensive Cancer Center in Lyon, Dr. Rousseau was head of the pediatric translational research program. Earlier in his career, he was a clinical fellow at Texas Children’s Cancer Center and a research fellow at the Center for Cell and Gene Therapy at Baylor College of Medicine in Houston. Dr. Rousseau currently serves on the strategic advisory board of Owkin, Inc., a startup company that specializes in AI and Federated Learning for medical research. He received a Ph.D. in therapeutic biotechnologies at the Université Denis Diderot and an M.D. from Université René Descartes, both in Paris. He is board certified in pediatrics and has a sub-specialty certification in pediatric hematology-oncology.

Rahsaan Thompson has served as our Executive Vice President and General Counsel since April 2020. Previously, Mr. Thompson was the general counsel for Opiant Pharmaceuticals, where he was responsible for all legal aspects of corporate strategy, intellectual property, transactions, compliance and regulatory matters. Previously, as the vice president of law for Actelion Pharmaceuticals, he led the Actelion Law Department based in San Francisco, California. In this position, Mr. Thompson was responsible for overseeing the law department’s support for the Actelion U.S. business. In earlier years at Actelion, he served as associate general counsel and corporate secretary, where he led litigation, government investigations and acquisitions. Before joining Actelion, he worked for the law firm of Quarles & Brady in Chicago, Illinois. Mr. Thompson was the associate general counsel at Abraxis Bioscience, before its acquisition by Celgene. Mr. Thompson also served as Corporate Counsel at McKesson Corporation. He began his career as an assistant district attorney in the Philadelphia District Attorney’s office. Mr. Thompson obtained his bachelor’s degree from Southern Methodist University and his law degree from Hofstra University. He has served on various non-profit boards and presently serves on the Oakland Museum of California Board of Directors as the Finance Committee Chair.

Vijay Yabannavar, Ph.D. joined Gritstone in July 2019 and serves as Executive Vice President and Chief of Manufacturing and Technical Operations. As vice president of global technical operations - vaccines, biologics and sterile operations - at Merck from 2015 until June 2019, he supported a large portfolio of products with total revenues of more than $16 billion per year. Prior to 2015, he was senior vice president of manufacturing & technical development at Emergent BioSolutions, and the site head of Emergent’s Baltimore manufacturing facility with a biodefense focus. From 2007 to 2010, Dr. Yabannavar was vice president of process development and manufacturing at Trubion Pharmaceuticals, where he worked on novel molecules, including bispecifics to treat cancer and autoimmune disorders. Prior to that, he was the head of technical research and development for Novartis Pharmaceuticals, responsible for the process, analytical and formulation development groups for biopharmaceuticals and vaccines. Dr. Yabannavar also held similar technical product and process development roles at Chiron Corporation and Schering-Plough Corporation. He obtained his Ph.D. in chemical engineering from the Massachusetts Institute of Technology (MIT) and his B. Tech. in chemical engineering from the Indian Institute of Technology in Bombay.

Roman Yelensky, Ph.D. has served as our Executive Vice President, Chief Technology Officer since March 2017. He joined Gritstone at its inception in October 2015 as executive vice president of sequencing and bioinformatics. Prior to Gritstone, from July 2010 to September 2015, Dr. Yelensky served as vice president of biomarker and companion diagnostic development at Foundation Medicine. Prior to Foundation Medicine, Dr. Yelensky was a senior scientist in biomarker development at Novartis AG from April 2009 to July 2010. He received a B.A. in computer science from Cornell University, an M.S. in computer science from Stanford University and a Ph.D. in bioinformatics and integrative genomics from the Harvard-MIT Division of Health Sciences and Technology.

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EXECUTIVE COMPENSATION

This section discusses the material components of the executive compensation program for our “named executive officers” in the “Summary Compensation Table” below. Our named executive officers in 2020, and their positions, are as follows:

•	Andrew Allen, M.D., Ph.D., President and Chief Executive Officer;

•	Roman Yelensky, Ph.D., Executive Vice President and Chief Technology Officer; and

•	Erin Jones, Chief Operating Officer.

As an “emerging growth company” as defined in the JOBS Act, we are not required to include a Compensation Discussion and Analysis section and have elected to comply with the scaled disclosure requirements applicable to emerging growth companies.

Summary Compensation Table

The following table provides information regarding the compensation of our named executive officers for the fiscal years presented.

Name and Principal Position	Year	Salary ($)	Bonus ($)	Option Awards ($)⁽¹⁾	Non-Equity Incentive Plan Compensation ($)⁽²⁾	All Other Compensation ($)⁽³⁾	Total ($)
Andrew Allen, M.D., Ph.D. President and Chief Executive Officer	2020	569,167	—	1,381,806	298,812	5,700	2,255,485
	2019	533,333	—	1,395,171	253,333	5,600	2,187,437
Roman Yelensky, Ph.D. Executive Vice President and Chief Technology Officer	2020	399,304	—	652,928	167,708	3,188	1,223,127
Erin Jones Chief Operating Officer	2020	375,314	—	703,162	157,632	4,438	1,240,546

(1)

The amounts included in this column reflect the aggregate grant date fair value of stock options computed in accordance with the provisions of Accounting Standards Codification (ASC) 718, Compensation – Stock Compensation. The assumptions that we used to calculate these amounts are discussed in Note 10 to the financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

(2)	The amounts included in this column reflect bonus payments earned based on performance pursuant to our annual cash bonus program.

(3)	The amounts included in this column represent matching contributions under our 401(k) plan.

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Outstanding Equity Awards at 2020 Fiscal Year End

The following table provides information regarding equity awards held by our named executive officers as of December 31, 2020.

		Option Awards
Name	Vesting Start Date⁽¹⁾	Number of Securities Underlying Unexercised Options (#) Exercisable	Number of Securities Underlying Unexercised Options (#) Unexercisable	Option Exercise Price ($)	Option Expiration Date
Andrew Allen, M.D., Ph.D.	03/01/20	51,562	223,438	8.91	02/24/30
	03/01/19	78,750	101,250	12.02	02/12/29
	09/27/18	79,890	62,138	9.59	08/06/28
Roman Yelensky, Ph.D.	03/01/20	24,375	105,625	8.91	02/24/30
	03/01/19	28,875	37,125	12.02	02/12/29
	09/27/18	40,760	31,703	9.59	08/06/28
	03/01/17	47,556	3,168	0.76	02/07/27
Erin Jones	03/01/20	26,249	113,751	8.91	02/24/30
	03/01/19	28,875	37,125	12.02	02/12/29
	09/27/18	16,304	12,681	9.59	08/06/28
	03/01/17	13,588	904	0.76	02/07/27
	05/09/16	37,971	—	0.35	05/17/26

(1)	Options vest as to 1/48th of the shares initially underlying the option on each monthly anniversary of the vesting start date, subject to continued service to us.

Narrative to Summary Compensation Table and Outstanding Equity Awards at 2020 Fiscal Year End

2020 Salaries

Our named executive officers each receive a base salary to compensate them for services rendered to the Company. The base salary payable to each named executive officer is intended to provide a fixed component of compensation reflecting the executive’s skill set, experience, role and responsibilities.

Effective March 1, 2020, Dr. Allen’s annual base salary was $575,000, Dr. Yelensky’s base salary was $402,065, and Mr. Jones’ base salary was $380,397. The base salary amounts actually paid in fiscal year 2020 are set forth above in the Summary Compensation Table in the column titled “Salary.”

2020 Bonuses

We maintain an annual performance-based cash bonus program in which each of our named executive officers participated in 2020. Each named executive officer’s target bonus is expressed as a percentage of base salary which can be achieved by meeting certain corporate goals established by our board of directors and subject to downward discretion. The 2020 annual bonuses for Dr. Allen, Dr. Yelensky, and Mr. Jones were targeted at 50%, 40%, and 40% of their respective base salaries.

In early 2021, our board of directors reviewed and approved the achievement of our 2020 corporate goals at 105%. Based on this level of achievement, our named executive officers were paid bonuses at 105% of their targeted amounts.

The annual cash bonuses paid to each named executive officer for 2020 performance are set forth above in the Summary Compensation Table in the column titled “Non-Equity Incentive Plan Compensation.”

2020 Equity Compensation

On February 20, 2020, our board of directors granted Dr. Allen, Dr. Yelensky, and Mr. Jones an option to purchase 275,000, 130,000, and 140,000 shares of our common stock, respectively. Each option has an exercise price per share equal to $8.91, which was the closing trading price of our common stock on the date of grant.

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Each option vests as to 1/48th of the initial number of shares underlying the option on each monthly anniversary of March 1, 2020, subject to the named executive officer’s continued service to us.

Options granted to Dr. Allen, Dr. Yelensky, and Mr. Jones are subject to the accelerated vesting provisions in their employment agreements described below under “Executive Compensation Arrangements.”

Executive Compensation Arrangements

Employment Agreements

In September 2018, we entered into new employment agreements with each of our named executive officers, which superseded in their entirety their prior offer letters with us. Each employment agreement provides that the executive’s employment with us is at-will, and provides for an annual base salary and target annual bonus (expressed as a percentage of base salary), as well as severance and change in control benefits, as described below.

Under Dr. Allen’s employment agreement, if he is terminated without “cause” or resigns for “good reason” (as each is defined in his employment agreement), he will be eligible to receive the following: (i) an amount equal to the sum of his base salary and target annual bonus; and (ii) payment or reimbursement of up to 12 months of healthcare continuation coverage. In addition, if Dr. Allen is terminated without cause or resigns for good reason during the period commencing three months before and ending 12 months after a change in control of the Company, he will be eligible to receive the following: (i) an amount equal to the sum of (A) 150% of his base salary and (B) his target annual bonus; (ii) payment or reimbursement of up to 18 months of healthcare continuation coverage; and (iii) full vesting acceleration of all then-outstanding equity awards. The foregoing severance benefits are subject to Dr. Allen’s execution and non-revocation of a general release of claims against the Company.

Under each of Dr. Yelensky’s and Mr. Jones’s employment agreements, if either is terminated without “cause” or resigns for “good reason” (as each is defined in their respective employment agreements), other than in connection with a change in control as described below, the executive will be eligible to receive the following: (i) an amount equal to the sum of (A) 75% of the executive’s base salary and (B) the executive’s target annual bonus; and (ii) payment or reimbursement of up to nine months of healthcare continuation coverage. In addition, if either is terminated without cause or resigns for good reason during the period commencing three months before and ending 12 months after a change in control of the Company, the executive will be eligible to receive the following: (i) an amount equal to the sum of the executive’s base salary and target annual bonus; (ii) payment or reimbursement of up to 12 months of healthcare continuation coverage; and (iii) full vesting acceleration of all then-outstanding equity awards. The foregoing severance benefits are subject to the executive’s execution and non-revocation of a general release of claims against the Company.

Other Elements of Compensation

Retirement Savings and Health and Welfare Benefits

We maintain a 401(k) retirement savings plan for our employees, including our named executive officers, who satisfy certain eligibility requirements. Our named executive officers are eligible to participate in the 401(k) plan on the same terms as other full-time employees. Currently, we may match (in our discretion) contributions made by participants in the 401(k) plan in the amount equal to 50% of up to 4% of the participant’s eligible compensation contributed to the plan, not to exceed 2% of a participant’s eligible compensation. We believe that providing a vehicle for tax-deferred retirement savings though our 401(k) plan adds to the overall desirability of our executive compensation package and further incentivizes our employees, including our named executive officers, in accordance with our compensation policies.

All of our full-time employees, including our named executive officers, are eligible to participate in our health and welfare plans, including medical, dental and vision benefits; medical and dependent care flexible spending accounts; short-term and long-term disability insurance; and life and AD&D insurance.

Perquisites and Other Personal Benefits

We provide limited perquisites to our named executive officers when our compensation committee determines that such perquisites are necessary or advisable to fairly compensate or incentivize our employees.

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Equity Compensation Plan Information

The following table provides certain information as of December 31, 2020, with respect to all of our equity compensation plans in effect on that date:

Plan Category	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants and Rights (a)	Weighted- Average Exercise Price of Outstanding Options, Warrants and Rights (b)	Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column (a)) (c)⁽³⁾
Equity Compensation Plans Approved by Stockholders^(1)(2)(3)	4,166,441⁽⁴⁾	$8.13	3,744,779⁽⁵⁾
Equity Compensation Plans Not Approved by Stockholders	—	—	—
Total	4,166,441	$8.13	3,744,779

(1)	Consists of the Gritstone Oncology, Inc. 2018 Incentive Award Plan, 2018 Employee Stock Purchase Plan and 2015 Equity Incentive Plan, as amended.

(2)

The 2018 Equity Incentive Award Plan contains an “evergreen” provision, pursuant to which the number of shares of common stock reserved for issuance pursuant to awards under such plan shall be increased on the first day of each year beginning in 2019 and ending in 2028 equal to the lesser of (A) four percent (4%) of the shares of stock outstanding (on an as converted basis) on the last day of the immediately preceding fiscal year and (B) such smaller number of shares of stock as determined by our board of directors; provided, however, that no more than 45,000,000 shares of stock may be issued upon the exercise of incentive stock options.

(3)

The 2018 Employee Stock Purchase Plan contains an “evergreen” provision, pursuant to which the number of shares of common stock reserved for issuance under such plan shall be increased on the first day of each year beginning in 2019 and ending in 2028 equal to the lesser of (A) one percent (1%) of the shares of stock outstanding (on an as converted basis) on the last day of the immediately preceding fiscal year and (B) such smaller number of shares of stock as determined by our board of directors; provided, however, no more than 5,000,000 shares of stock may be issued under the 2018 Employee Stock Purchase Plan.

(4)	Consists of 4,166,441 shares of common stock underlying outstanding options.

(5)	Includes 3,108,412 and 636,367 shares that were available for future issuance as of December 31, 2020 under the 2018 Incentive Award Plan and 2018 Employee Stock Purchase Plan, respectively.

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DIRECTOR COMPENSATION

Pursuant to our Director Compensation Program as amended in February 2020, our non-employee directors receive cash compensation as follows:

•	Each non-employee director receives an annual cash retainer in the amount of $40,000 per year.

•	The chairperson of the board of directors receives an additional annual cash retainer in the amount of $30,000 per year for such chairperson’s service presiding over the executive sessions of the board of directors and acting as a liaison between management and the board of directors.

•

The chairperson of the audit committee receives additional annual cash compensation in the amount of $15,000 per year for such chairperson’s service on the audit committee. Each non-chairperson member of the audit committee receives additional annual cash compensation in the amount of $7,500 per year for such member’s service on the audit committee.

•

The chairperson of the compensation committee receives additional annual cash compensation in the amount of $10,000 per year for such chairperson’s service on the compensation committee. Each non-chairperson member of the compensation committee receives additional annual cash compensation in the amount of $5,000 per year for such member’s service on the compensation committee.

•

The chairperson of the nominating and corporate governance committee receives additional annual cash compensation in the amount of $8,000 per year for such chairperson’s service on the nominating and corporate governance committee. Each non-chairperson member of the nominating and corporate governance committee receives additional annual cash compensation in the amount of $4,000 per year for such member’s service on the nominating and corporate governance committee.

Under the Director Compensation Program as in effect in 2020, each non-employee director will automatically be granted an option to purchase 25,000 shares of our common stock upon the director’s initial appointment or election to our board of directors, referred to as the Initial Grant, and an option to purchase 12,500 shares of our common stock automatically on the date of each annual stockholder’s meeting thereafter, referred to as the Annual Grant. The Initial Grant will vest in substantially equal monthly installments for three years from the date of grant, subject to continued service through each applicable vesting date. The Annual Grant will vest on the earlier of the first anniversary of the date of grant or the date of the next annual stockholder’s meeting to the extent unvested as of such date, subject to continued service through each applicable vesting date.

Director Compensation Table

The following table sets forth information regarding compensation awarded to, earned by or paid to our non-employee directors during 2020:

Name	Fees Earned or Paid in Cash ($)⁽¹⁾	Option Awards ($)⁽²⁾	All Other Compensation ($)	Total ($)
Richard Heyman, Ph.D.	49,000	49,138	—	98,138
Judith Li	48,000	49,138	—	97,138
Elaine Jones, Ph.D.	67,500	49,138	—	116,638
Steve Krognes	60,000	49,138	—	109,138
Nicholas Simon	47,500	49,138	—	96,638
Thomas Woiwode, Ph.D.	54,000	49,138	—	103,138

(1)	Amounts represent the annual cash retainer and committee fees paid to each of our non-employee directors in the year ended December 31, 2020 pursuant to our Director Compensation Program.

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(2)

Amounts reflect the aggregate grant date fair value of stock options granted during 2020 computed in accordance with the provisions of Accounting Standards Codification (ASC) 718, Compensation – Stock Compensation. The assumptions that we used to calculate these amounts are discussed in Note 10 to the financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020. The number of shares underlying outstanding equity awards held by our non-employee directors as of December 31, 2020 is shown in the table below.

Name			Shares Underlying Option Awards (#)
Richard Heyman, Ph.D.			21,700
Judith Li			21,700
Elaine Jones, Ph.D.			28,442
Steve Krognes			37,012
Nicholas Simon			21,700
Thomas Woiwode, Ph.D.			21,700

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SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The following table presents information as to the beneficial ownership of our common stock as of April 21, 2021 for:

•	each person, or group of affiliated persons, known by us to beneficially own more than 5% of our outstanding shares of common stock;

•	each of our named executive officers;

•	each of our directors; and

•	all executive officers and directors as a group.

Beneficial ownership is determined in accordance with the rules of the SEC and generally includes voting or investment power with respect to securities. Unless otherwise indicated below, to our knowledge, the persons and entities named in the table have sole voting and sole investment power with respect to all shares beneficially owned, subject to community property laws where applicable. Shares of our common stock subject to options that are currently exercisable or exercisable within 60 days of April 21, 2021 are deemed to be outstanding and to be beneficially owned by the person holding the options for the purpose of computing the percentage ownership of that person, but are not treated as outstanding for the purpose of computing the percentage ownership of any other person.

The percentage of shares beneficially owned is computed on the basis of 49,197,828 shares of our common stock outstanding as of April 21, 2021. This table is based upon information supplied by officers, directors and principal stockholders and Schedules 13D and Schedules 13G, if any, filed with the SEC, as well as information provided by The Nasdaq Stock Market, LLC. Unless otherwise indicated, the address of each of the individuals and entities named below is c/o Gritstone Oncology, Inc., 5959 Horton Street, Suite 300, Emeryville, CA 94608.

	Shares of Common Stock Beneficially Owned
Name of Beneficial Owner	Common Stock	Securities Exercisable Within 60 Days	Number of Shares Beneficially Owned	Percent
5% Stockholders:
Entities affiliated with Avidity Partners Management LP⁽¹⁾	2,122,064	3,102,765	5,224,829	9.99%*
Entities affiliated with Redmile Group, LLC⁽²⁾	2,774,794	2,377,590	5,152,384	9.99%*
Entities affiliated with EcoR1 Capital, LLC⁽³⁾	2,851,287	2,292,607	5,143,894	9.99%*
Entities affiliated with Versant Ventures⁽⁴⁾	4,450,638	—	4,450,638	9.05%
Morgan Stanley & Co. LLC⁽⁵⁾	3,099,428	—	3,099,428	6.30%
Clarus Life Sciences III, L.P.⁽⁶⁾	2,567,445	—	2,567,445	5.22%
Named Executive Officers and Directors:
Andrew Allen, M.D., Ph.D.⁽⁷⁾	1,449,275	299,997	1,749,272	3.53%
Roman Yelensky, Ph.D.⁽⁸⁾	183,948	129,808	313,756	**
Erin Jones⁽⁹⁾	20,000	158,911	178,911	**
Richard Heyman, Ph.D.⁽¹⁰⁾	53,323	21,070	74,393	**
Elaine Jones, Ph.D.	—	21,800	21,800	**
Steve Krognes	—	32,364	32,364	**
Judith Li	—	21,070	21,070	**
Nicholas Simon⁽¹¹⁾	2,567,445	21,070	2,588,515	5.26%
Thomas Woiwode, Ph.D.⁽¹²⁾	4,450,638	21,070	4,471,708	9.09%
All executive officers and directors as a group (14 persons)⁽¹³⁾	9,189,736	1,250,853	10,440,589	20.70%

Beneficial ownership includes pre-funded warrants to purchase common stock; pursuant to the terms of those warrants, a holder does not have the right to exercise any portion of the warrant to the extent that, after giving effect to the issuance of common stock after exercise, the holder would beneficially own in excess of 9.99%.

**	Indicates beneficial ownership of less than 1% of the outstanding shares of common stock.

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(1)

Based solely on a Schedule 13G filed with the SEC on December 28, 2020 by the following persons and entities with respect to shares of common stock beneficially owned on December 28, 2020, as updated by information provided to Gritstone by The Nasdaq Stock Market LLC as of March 31, 2021: Avidity Partners Management LP, Avidity Partners Management (GP) LLC, Avidity Capital Partners Fund (GP) LP, Avidity Capital Partners (GP) LLC, Avidity Master Fund LP, David Witzke and Michael Gregory. The address of the above persons and entities is 2828 N Harwood Street, Suite 1220, Dallas, Texas 75201.

(2)

Based solely on a Schedule 13G/A filed with the SEC on February 16, 2021 with respect to shares of common stock beneficially owned on December 31, 2020, as updated by information provided to Gritstone by The Nasdaq Stock Market LLC as of March 31, 2021, Redmile Group, LLC’s beneficial ownership of our common stock is comprised of shares of common stock owned by certain private investment vehicles and/or separately managed accounts managed by Redmile Group, LLC, which shares of common stock may be deemed beneficially owned by Redmile Group, LLC as investment manager of such private investment vehicles and/or separately managed accounts. The reported securities may also be deemed beneficially owned by Jeremy C. Green as the principal of Redmile Group, LLC. Redmile Group, LLC and Mr. Green each disclaim beneficial ownership of these shares, except to the extent of its or his pecuniary interest in such shares, if any. Subject to the Beneficial Ownership Blocker (as defined below), Redmile Group, LLC may also be deemed to beneficially own 15,060,000 shares of common stock issuable upon exercise of certain pre-funded warrants to purchase common stock (the “Warrants”). Pursuant to the terms of the Warrants, a holder of a Warrant does not have the right to exercise any portion of the Warrant held by such holder, and any such exercise shall be void ab initio, to the extent (but only to the extent) that after giving effect to such issuance after exercise, the holder (together with the holder’s affiliates, and any other persons acting as a group together with the holder or any of the holder’s affiliates), would beneficially own in excess of 9.99% (the “Beneficial Ownership Limitation”) of the number of shares of common stock outstanding immediately after giving effect to the issuance of shares of common stock issued upon exercise of the Warrant (the “Beneficial Ownership Blocker”). The number of shares of common stock shown as beneficially owned by Redmile Group, LLC reflects application of the Beneficial Ownership Limitation as described above, although the Beneficial Ownership Limitation may be changed at a holder’s election upon 61 days’ notice to Gritstone. The address of the above person and entities is One Letterman Drive, Building D, Suite D3-300, San Francisco, California 94129.

(3)

Based solely on a Schedule 13G filed with the SEC on January 4, 2021 by the following persons and entities with respect to shares of common stock beneficially owned on December 28, 2020, as updated by information provided to Gritstone by The Nasdaq Stock Market LLC as of March 31, 2021: EcoR1 Capital Fund Qualified, L.P., EcoR1 Capital, LLC and Oleg Nodelman (collectively, the “Filers”). Each Filer disclaims beneficial ownership of our common stock except to the extent of that person’s pecuniary interest therein. The address of the above persons and entities is 357 Tehama Street #3, San Francisco, CA 94103.

(4)

Consists of (i) 2,723,031 shares of common stock held by Versant Venture Capital V, L.P. (“VVC V”), (ii) 207,234 shares of common stock held by Versant Venture Capital V (Canada) LP (“VVC CAN”), (iii) 90,756 shares of common stock held by Versant Ophthalmic Affiliates Fund I, L.P. (“VOA”), (iv) 81,908 shares of common stock held by Versant Affiliates Fund V, L.P. (“VAF V”) and (v) 1,347,709 shares of common stock held by Versant Vantage I, L.P. (“VV I” and together with VVC V, VVC CAN, VOA and VAF V, the “Versant Entities”). Versant Ventures V, LLC (“VV V”) is the sole general partner of VVC V, VAF V and VOA. Samuel D. Colella (“Colella”), Jerel C. Davis (“Davis”), William J. Link (“Link”), Bradley Bolzon, Ph.D (“Bolzon”), Kirk G. Nielsen (“Nielsen”), Thomas Woiwode (“Woiwode”) and Robin L. Praeger (“Praeger”) are managing directors of VV V. Versant Ventures V GP-GP (Canada), Inc. (“VV V CAN GP”) is the sole general partner of Versant Ventures V (Canada), L.P. (“VV V CAN”), and VV V CAN is the sole general partner of VVC CAN. Colella, Davis, Link, Bolzon, Praeger, Nielsen and Woiwode are directors of VV V CAN GP. Versant Vantage I GP-GP, LLC (“VV I GP-GP”) is the sole general partner of Versant Vantage I GP, L.P. (“VV I GP”, and, together with the Versant Entities, VV V, VV V CAN GP, VV V CAN and VV I GP-GP, the “Versant Reporting Persons”), and VV I GP is the sole general partner of VV I. Bolzon, Davis, Clare Ozawa (“Ozawa”), Woiwode and Praeger are the managing directors of VV I GP-GP. Colella, Davis, Link, Bolzon, Praeger, Nielsen, Woiwode and Ozawa may be deemed to share voting and investment power over the shares of our common stock held by the Versant Entities and disclaim beneficial ownership of all such shares except to the extent of their pecuniary interest therein. The address for each of the Versant Reporting Persons is One Sansome Street, Suite 3630, San Francisco, CA 94104.

(5)	Based solely on information provided to Gritstone by The Nasdaq Stock Market LLC as of March 31, 2021.

(6)

Based solely on a Schedule 13D/A filed with the SEC on January 11, 2019 by the following persons and entities (collectively, the “Clarus Reporting Persons”) with respect to shares of common stock beneficially owned as of January 4, 2019, as updated by information provided to Gritstone by The Nasdaq Stock Market LLC as of March 31, 2021: Clarus Lifesciences III, L.P. (the “Fund”); Clarus Ventures III GP, L.P. (“Clarus GP”), which is the sole general partner of the Fund, Blackstone Clarus III L.L.C., which is the sole general partner of Clarus GP, Blackstone Holdings II L.P., which is the sole member of Blackstone Clarus III L.L.C., Blackstone Holdings I/II GP Inc., which is the sole general partner of Blackstone Holdings II L.P., The Blackstone Group L.P., which is the controlling shareholder of Blackstone Holdings I/II GP Inc., and Blackstone Group Management L.L.C. (collectively, with Blackstone Clarus III L.L.C., Blackstone Holdings II L.P., Blackstone Holdings I/II GP Inc. and The Blackstone Group L.P., the “Control Entities”), which is the sole general partner of The Blackstone Group L.P. and which is wholly-owned by Blackstone’s senior managing directors and controlled by its founder, Stephen A. Schwarzman; and Clarus Ventures III, LLC (“Clarus GP LLC”), and Robert Liptak, Nicholas Simon, Nicholas Galakatos, Dennis Henner and Kurt Wheeler (together, the “Managing Directors”, and collectively with Clarus GP LLC, the “Clarus Persons”). The Managing Directors are the members of Clarus GP LLC. Clarus GP LLC is the former general partner of Clarus GP. Each such Reporting Person may be deemed to beneficially own the common stock beneficially owned by the Fund directly or indirectly controlled by it or him, but each of the Clarus Reporting Persons expressly disclaims beneficial ownership of such common stock. The address of the principal business office of the Fund, Clarus GP and each of the Clarus Persons is Clarus Ventures, 101 Main Street, Suite 1210, Cambridge, MA 02142. The address of the principal business office of each of the Control Entities and Mr. Schwarzman is c/o The Blackstone Group L.P., 345 Park Avenue, New York, NY 10154.

(7)	Consists of (i) 1,449,275 shares of common stock held directly by a family trust of which Dr. Allen is a trustee and (ii) 299,997 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

(8)	Consists of (i) 183,948 shares of common stock held by Dr. Yelensky and (ii) 129,808 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

(9)	Consists of (i) 20,000 shares of common stock held by Mr. Jones and (ii) 158,911 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

(10)	Consists of (i) 53,323 shares of common stock and (ii) 21,070 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

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(11)	Consists of (i) the shares described in footnote 6 above, of which Mr. Simon disclaims beneficial ownership except to the extent of his pecuniary interests therein, and (ii) 21,070 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

(12)	Consists of (i) the shares described in footnote 4 above, of which Dr. Woiwode disclaims beneficial ownership except to the extent of his pecuniary interests therein, and (ii) 21,070 shares that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

(13)	Consists of (i) 9,189,736 shares of common stock and (ii) 1,250,853 shares of common stock that may be acquired pursuant to the exercise of stock options within 60 days of April 21, 2021.

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SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Section 16(a) of the Exchange Act requires the Company’s directors and executive officers, and persons who own more than 10% of a registered class of the Company’s equity securities, to file with the SEC initial reports of ownership and reports of changes in ownership of common stock and other equity securities of the Company. Officers, directors and greater than 10% stockholders are required by SEC regulations to furnish the Company with copies of all Section 16(a) forms they file.

To the Company’s knowledge, based solely on a review of the copies of such reports furnished to the Company and written representations that no other reports were required, the Company believes that all Section 16(a) filing requirements applicable to our officers, directors and greater than 10% beneficial owners were complied with during the year ended December 31, 2020.

ADDITIONAL INFORMATION

Householding of Proxy Materials

The SEC has adopted rules that permit companies and intermediaries (e.g., brokers) to satisfy the delivery requirements for proxy statements and annual reports with respect to two or more stockholders sharing the same address by delivering a single proxy statement addressed to those stockholders. This process, which is commonly referred to as “householding,” potentially means extra convenience for stockholders and cost savings for companies.

Brokers with account holders who are Gritstone stockholders may be “householding” our proxy materials. A single proxy statement may be delivered to multiple stockholders sharing an address unless contrary instructions have been received from the affected stockholders. Once you have received notice from your broker that it will be “householding” communications to your address, “householding” will continue until you are notified otherwise or until you notify your broker or the Company that you no longer wish to participate in “householding.”

If, at any time, you no longer wish to participate in “householding” and would prefer to receive a separate proxy statement and annual report, you may (1) notify your broker or (2) direct your written request to: 5959 Horton Street, Suite 300, Emeryville, CA 94608. Stockholders who currently receive multiple copies of this Proxy Statement at their address and would like to request “householding” of their communications should contact their broker. In addition, the Company will promptly deliver, upon written or oral request to the address or telephone number above, a separate copy of the Form 10-K, Proxy Statement, Proxy Card or Notice of Internet Availability of Proxy Materials to a stockholder at a shared address to which a single copy of the documents was delivered.

Incorporation by Reference

Notwithstanding anything to the contrary set forth in any of our previous filings under the Securities Act or the Exchange Act, which might incorporate future filings made by us under those statutes, the Audit Committee Report will not be incorporated by reference into any of those prior filings, nor will any such report be incorporated by reference into any future filings made by us under those statutes. In addition, information on our website, other than our proxy statement, notice and form of proxy, is not part of the proxy soliciting material and is not incorporated herein by reference.

Other Matters

As of the date of this Proxy Statement, the board of directors does not intend to present any matters other than those described herein at the Annual Meeting and is unaware of any matters to be presented by other parties.

If other matters are properly brought before the Annual Meeting for action by the stockholders, proxies will be voted in accordance with the recommendation of the board of directors or, in the absence of such a recommendation, in the discretion of the proxy holder.

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We have filed our Annual Report on Form 10-K for the year ended December 31, 2020 with the SEC. It is available free of charge at the SEC’s web site at www.sec.gov and our website at http://www.gritstone.com. Upon written request by a Gritstone stockholder, we will mail without charge a copy of our Annual Report on Form 10-K, including the financial statements and financial statement schedules, but excluding exhibits to the Annual Report on Form 10-K. Exhibits to the Annual Report on Form 10-K are available upon payment of a reasonable fee, which is limited to our expenses in furnishing the requested exhibit. All requests should be directed to the Corporate Secretary, 5959 Horton Street, Suite 300, Emeryville, CA 94608.

			By Order of the Board of Directors

			/s/ Andrew Allen
			Andrew Allen, M.D., Ph.D.
			President and Chief Executive Officer

April 23, 2021

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