William D. Baird III - 01 Mar 2022 Form 4 Insider Report for 2seventy bio, Inc. (TSVT)

Role: Chief Financial Officer
Signature: /s/ Teresa Jurgensen, Attorney-in-Fact
Issuer symbol: TSVT
Transactions as of: 01 Mar 2022
Net transactions value: $0
Form type: 4
Filing time: 05 May 2022, 20:36:12 UTC
Previous filing: 22 Feb 2022
Next filing: 23 May 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TSVT	Common Stock	Award	$0	+33,750	+59%	$0.000000	91,328	01 Mar 2022	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	TSVT	Stock Option (Right to buy)	Award	$0	+67,500		$0.000000	67,500	01 Mar 2022	Common Stock	67,500	$13.41	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Restricted stock unit awards vest over a four-year period at the rate of 25% on 01/01/2023, 25% on 01/01/2024, 25% on 01/01/2025, and 25% on 01/01/2026.
F2	This stock option vests over a four-year period at the rate of 25% on 01/01/2023 and then in 36 equal monthly installments thereafter.