SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Woiwode Thomas (Last) (First) (Middle) ONE SANSOME STREET SUITE 3630 (Street) SAN FRANCISCO CA 94104 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Gritstone Oncology, Inc. [ GRTS ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 10/02/2018
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/02/2018		C		3,102,929	A	(1)(2)	3,102,929	I	See Footnote(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series A Convertible Preferred Stock	(1)	10/02/2018		C			2,173,909	(1)	(1)	Common Stock	2,173,909	$0	0	I	See Footnote(4)
Series B Convertible Preferred Stock	(2)	10/02/2018		C			929,020	(2)	(2)	Common Stock	929,020	$0	0	I	See Footnote(5)

Explanation of Responses:

1. The Series A Convertible Preferred Stock automatically converted into shares of Common Stock on a 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

2. The Series B Convertible Preferred Stock automatically converted into shares of Common Stock on a 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

3. Consists of (I) 2,723,031 shares held by Versant Venture Capital V, L.P. ("VVC V"), (ii) 207,234 shares held by Versant Venture Capital V (Canada) LP ("VVC CAN"), (iii) 90.756 shares held by Versant Ophthalmic Affiliates Fund I, L.P. ("VOA"), and (iv) 81,908 shares held by Versant Affiliates Fund V, L.P. ("VAF V"). Versant Ventures V, LLC, or VV V,serves as the sole general partner of VOA, VAF V and VVC V and owns no shares directly. Versant Ventures V (Canada) GP-GP, Inc. ("VV V CAN GP"), serves as the sole general partner of Versant Ventures V (Canada), L.P. ("VV V CAN"), which serves as the sole general partner of VVC CAN and owns no shares directly. The Reporting Person is a managing director of VV V and a director of VV V CAN GP and shares voting and dispositive power over the shares held by VOA, VAF V, VVC V and VVC CAN. He disclaims beneficial ownership of the shares held by VOA, VAF V, VVC V and VVC CAN, except to the extent of his pecuniary interest therein.

4. Consists of (I) 1,907,729 shares held by Versant Venture Capital V, L.P. ("VVC V"), (ii) 145,186 shares held by Versant Venture Capital V (Canada) LP ("VVC CAN"), (iii) 63,610 shares held by Versant Ophthalmic Affiliates Fund I, L.P. ("VOA"), and (iv) 57,384 shares held by Versant Affiliates Fund V, L.P. ("VAF V"). Versant Ventures V, LLC, or VV V, serves as the sole general partner of VOA, VAF V and VVC V and owns no shares directly. Versant Ventures V (Canada) GP-GP, Inc. ("VV V CAN GP"), serves as the sole general partner of Versant Ventures V (Canada), L.P. ("VV V CAN"), which serves as the sole general partner of VVC CAN and owns no shares directly. The Reporting Person is a managing director of VV V and a director of VV V CAN GP and shares voting and dispositive power over the shares held by VOA, VAF V, VVC V and VVC CAN. He disclaims beneficial ownership of the shares held by VOA, VAF V, VVC V and VVC CAN, except to the extent of his pecuniary interest therein.

5. Consists of (I) 815,302 shares held by Versant Venture Capital V, L.P. ("VVC V"), (ii) 62,048 shares held by Versant Venture Capital V (Canada) LP ("VVC CAN"), (iii) 27,146 shares held by Versant Ophthalmic Affiliates Fund I, L.P. ("VOA"), and (iv) 24,524 shares held by Versant Affiliates Fund V, L.P. ("VAF V"). Versant Ventures V, LLC, or VV V, serves as the sole general partner of VOA, VAF V and VVC V and owns no shares directly. Versant Ventures V (Canada) GP-GP, Inc. ("VV V CAN GP"), serves as the sole general partner of Versant Ventures V (Canada), L.P. ("VV V CAN"), which serves as the sole general partner of VVC CAN and owns no shares directly.The Reporting Person is a managing director of VV V and a director of VV V CAN GP and shares voting and dispositive power over the shares held by VOA, VAF V, VVC V and VVC CAN. He disclaims beneficial ownership of the shares held by VOA, VAF V, VVC V and VVC CAN, except to the extent of his pecuniary interest therein.

	/s/ Thomas Woiwode	10/02/2018
	** Signature of Reporting Person	Date
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