Erin Jones - 01 Dec 2021 Form 4 Insider Report for Gritstone bio, Inc.

Role: Chief Operating Officer
Signature: /s/ Rahsaan Thompson, Attorney-in-Fact for Erin Jones
Issuer symbol: N/A
Transactions as of: 01 Dec 2021
Net transactions value: -$12,665
Form type: 4
Filing time: 03 Dec 2021, 15:47:30 UTC
Previous filing: 03 Dec 2021
Next filing: 20 Apr 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GRTS	Common Stock	Options Exercise	$345	+1,000	+2.2%	$0.3450^*	46,900	01 Dec 2021	Direct	F1, F2
transaction	GRTS	Common Stock	Sale	$13,010	-1,000	-2.1%	$13.01^*	45,900	01 Dec 2021	Direct	F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	GRTS	Stock Option (Right to Buy)	Options Exercise	$0	-1,000	-3%	$0.000000	31,971	01 Dec 2021	Common Stock	1,000	$0.3450	Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The transaction was made pursuant to a 10b5-1 plan in effect at the time of the transaction.
F2	Includes 25,900 Restricted Stock Units which are subject to vesting.
F3	Fully exercisable.