Joseph Vittiglio - 01 Feb 2023 Form 4 Insider Report for bluebird bio, Inc. (BLUE)

Role: Chief Business & Legal Officer
Signature: /s/ Joseph Vittiglio
Issuer symbol: BLUE
Transactions as of: 01 Feb 2023
Net transactions value: $0
Form type: 4
Filing time: 03 Feb 2023, 15:05:27 UTC
Previous filing: 09 Jan 2023
Next filing: 06 Feb 2024
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BLUE	Common Stock	Award	$0	+50,000		$0.000000	50,000	01 Feb 2023	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	BLUE	Stock Options (Right to buy)	Award	$0	+100,000		$0.000000	100,000	01 Feb 2023	Common Stock	100,000	$6.38	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 2/1/2024, 25% on 2/1/2025, 25% on 2/1/2026, and 25% on 2/1/2027.
F2	The stock option vests over a four-year period at the rate of 25% on 2/1/2024 and then in 36 equal monthly installments thereafter.