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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1656634	Gritstone Oncology Inc.	GRTS	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1754287	Raphael Rousseau	C/O Gritstone Oncology, Inc. 5858 Horton Street, Suite 210 Emeryville CA 94608	See Remarks	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2019-08-21	10,000	$0.76	10,000	No	4	M	Direct
Common Stock	Disposition	2019-08-21	10,000	$10.76	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2019-08-21	10,000	$0.00	10,000	$0.76

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
155,326	2018-04-17	2027-05-17	No	4	M	Direct

Footnotes

Represents the weighted average sale price for the entire number of shares sold. The actual sale prices range from $10.71 to $10.87 per share. Detailed information on the exact number of shares sold at each sale price can be obtained from the Issuer upon request.
The stock option vests and becomes exercisable with respect to 25% of the total number of shares on April 17, 2018. The remaining shares vest and become exercisable in equal monthly installments over the following 36 months.