Andrew Allen - Jan 31, 2022 Form 4 Insider Report for Gritstone bio, Inc. (GRTS)

Role: President and CEO, Director
Signature: /s/ Rahsaan Thompson, Attorney-in-Fact for Andrew R. Allen
Stock symbol: GRTS
Transactions as of: Jan 31, 2022
Transactions value $: $0
Form type: 4
Date filed: 4/20/2022, 04:20 PM
Previous filing: Dec 10, 2021
Next filing: Jul 1, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GRTS	Common Stock	Award	$0	+70K	+145.23%	$0.00	118K	Jan 31, 2022	Direct	F1, F2
holding	GRTS	Common Stock						1.45M	Jan 31, 2022	See footnote	F3

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)	Award	$0	+410K		$0.00	410K	Jan 31, 2022	Common Stock	410K	$5.46	Direct	F4

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

Explanation of Responses:

Id	Content
F1	Represents Restricted Stock Units ("RSUs") which vest on the first anniversary of the grant date. Each RSU represents a contingent right to receive one share of common stock of the Issuer.
F2	Includes 94,100 Restricted Stock Units which are subject to vesting.
F3	The shares are held in the name of the Reporting Person's revocable trust of which the Reporting Person is a co-trustee. The Reporting person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein.
F4	One forty-eighth (1/48th) of the shares initially subject to the option will vest on each monthly anniversary measured from January 31, 2022 (the "Vesting Commencement Date"), so that 100% of the shares subject to the option will be fully vested and exercisable as of the fourth anniversary of the Vesting Commencement Date, subject to the Reporting Person's continued service through each vesting date.