Nick Leschly - 01 Mar 2022 Form 4 Insider Report for 2seventy bio, Inc. (TSVT)

Role: President and CEO, Director
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, 20:36:58 UTC
Previous filing: 12 Jan 2022
Next filing: 22 Mar 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	+133,500	+24%	$0.000000	690,388	01 Mar 2022	Direct	F1
holding	TSVT	Common Stock						15,233	01 Mar 2022	Nick Leschly 2001 Trust
holding	TSVT	Common Stock						41,000	01 Mar 2022	Nick Leschly Irrevocable GST Trust of 2019

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	+267,000		$0.000000	267,000	01 Mar 2022	Common Stock	267,000	$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.