Armon Sharei - Dec 22, 2021 Form 4 Insider Report for SQZ Biotechnologies Co (SQZB)

Role: President and CEO, Director
Signature: /s/ Lawrence Knopf, Attorney-in-Fact for Armon Sharei
Stock symbol: SQZB
Transactions as of: Dec 22, 2021
Transactions value $: $19,999
Form type: 4
Date filed: 12/22/2021, 04:15 PM
Next filing: Jan 4, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SQZB	Common Stock	Options Exercise	$20K	+11K	+4.25%	$1.81^*	271K	Dec 22, 2021	Direct	F1

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	SQZB	Stock Option	Options Exercise	$0	-11K	-5.64%	$0.00	185K	Dec 22, 2021	Common Stock	11K	$1.81	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	Options were exercised and held for tax planning purposes.
F2	The option was originally granted for 286,514 shares. The option vested and became exercisable as to the original share amount as to 25% of the underlying securities on October 11, 2017 and in 36 equal monthly installments thereafter.