Thomas J. Klima - 01 Jun 2021 Form 4 Insider Report for bluebird bio, Inc. (BLUE)

Role: Chief Commercial Officer, SGD
Signature: /s/ Helen C. Fu, Attorney-in-Fact
Issuer symbol: BLUE
Transactions as of: 01 Jun 2021
Net transactions value: +$777,750
Form type: 4
Filing time: 02 Jun 2021, 16:16:37 UTC
Previous filing: 10 May 2021
Next filing: 16 Nov 2021
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	$777,750	+25,000		$31.11	25,000	01 Jun 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	BLUE	Stock Option (right to buy)	Award	$0	+50,000		$0.000000	50,000	01 Jun 2021	Common Stock	50,000	$0.000000	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 06/01/2022, 25% on 06/01/2023, 25% on 06/01/2024, and 25% on 06/01/2025.
F2	This stock option vests over a four-year period at the rate of 25% on 5/10/2022, and then in 36 equal monthly installments thereafter.