Philip D. Gregory - Jan 5, 2024 Form 4 Insider Report for 2seventy bio, Inc. (TSVT)

Role: Chief Scientific Officer
Signature: /s/ Teresa Jurgensen, Attorney-in-Fact
Stock symbol: TSVT
Transactions as of: Jan 5, 2024
Transactions value $: -$2,984
Form type: 4
Date filed: 1/9/2024, 04:09 PM
Previous filing: Jan 5, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TSVT	Common Stock	Sale	-$2.98K	-795	-0.34%	$3.75	231K	Jan 5, 2024	Direct	F1, F2
transaction	TSVT	Common Stock	Award	$0	+79.4K	+34.41%	$0.00	310K	Jan 8, 2024	Direct	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	TSVT	Stock Option (Right to buy)	Award	$0	+159K		$0.00	159K	Jan 8, 2024	Common Stock	159K	$3.97	Direct	F4

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

Explanation of Responses:

Id	Content
F1	Shares were sold to cover tax withholding obligations incurred in connection with the vesting of restricted stock units ("RSUs").
F2	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.675 to $3.83, inclusive. The Reporting Person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
F3	RSU awards vest over a four-year period at the rate of 25% on 01/02/2025, 25% on 01/02/2026, 25% on 01/02/2027, and 25% on 01/02/2028.
F4	This stock option vests over a four-year period at the rate of 25% on 01/02/2025, and then in 36 equal monthly installments thereafter.