SEC FORM 3 SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
 
OMB APPROVAL
OMB Number: 3235-0104
Estimated average burden
hours per response: 0.5
1. Name and Address of Reporting Person*
Eatwell Victoria

(Last) (First) (Middle)
60 BINNEY STREET

(Street)
CAMBRIDGE MA 02142

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2024
3. Issuer Name and Ticker or Trading Symbol
2seventy bio, Inc. [ TSVT ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Financial Officer
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 54,147 D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Right to buy) (1) 05/01/2025 Common Stock 1,542 215.76 D
Stock Options (Right to buy) (1) 03/01/2026 Common Stock 377 78.44 D
Stock Options (Right to buy) (1) 12/01/2026 Common Stock 271 106.61 D
Stock Options (Right to buy) (1) 02/01/2027 Common Stock 655 117.4 D
Stock Options (Right to buy) (1) 02/01/2028 Common Stock 738 318.73 D
Stock Options (Right to buy) (1) 02/01/2029 Common Stock 417 209.06 D
Stock Options (Right to buy) (1) 03/02/2030 Common Stock 491 114.67 D
Stock Options (Right to buy) (2) 08/03/2030 Common Stock 344 97.49 D
Stock Options (Right to buy) (3) 07/01/2031 Common Stock 2,098 50.35 D
Stock Options (Right to buy) (4) 03/01/2032 Common Stock 11,830 13.41 D
Stock Options (Right to buy) (5) 02/01/2033 Common Stock 6,400 13.2 D
Stock Options (Right to buy) (5) 02/01/2033 Common Stock 9,000 13.2 D
Stock Options (Right to buy) (6) 10/02/2033 Common Stock 18,300 3.97 D
Stock Options (Right to buy) (6) 01/08/2034 Common Stock 21,700 3.97 D
Explanation of Responses:
1. This stock option is fully vested and currently exercisable.
2. This stock option vests over a four-year period at the rate of 25% on August 3, 2021, and then in 36 equal monthly installments thereafter.
3. This stock option vests over a four-year period at the rate of 25% on July 1, 2022, and then in 36 equal monthly installments thereafter.
4. This stock option vests over a four-year period at the rate of 25% on January 1, 2023, and then in 36 equal monthly installments thereafter.
5. This stock option vests over a four-year period at the rate of 25% on January 1, 2024, and then in 36 equal monthly installments thereafter.
6. This stock option vests over a three-year period at the rate of 25% on June 2, 2024, 25% on October 2, 2024, and then in 2 equal annual installments thereafter.
Remarks:
/s/ Iya Kessler, Attorney-in-Fact 04/03/2024
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
				LIMITED POWER OF ATTORNEY

       The undersigned hereby constitutes and appoints each of William D.
Baird III and Iya Kessler, signing singly, and with full power of substitution,
the undersigned's true and lawful attorney-in-fact to:

	(1)	execute for and on behalf of the undersigned, in the
undersigned's capacity as officer and/or director of 2seventy bio, Inc., a
Delaware corporation (the "Company"), from time to time the following U.S.
Securities and Exchange Commission ("SEC") forms: (i) Form ID, including any
attached documents (such as Update Passphrase Authentication), to effect the
assignment of codes to the undersigned to be used in the transmission of
information to the SEC using the EDGAR System; (ii) Form 3, Initial Statement
of Beneficial Ownership of Securities, including any attached documents;
(iii) Form 4, Statement of Changes in Beneficial Ownership of Securities,
including any attached documents; (iv) Form 5, Annual Statement of Beneficial
Ownership of Securities in accordance with Section 16(a) of the Securities
Exchange Act of 1934, as amended, and the rules thereunder, including
any attached documents; (v) Schedules 13D and 13G; and (vi) amendments of each
thereof, in accordance with the Securities Exchange Act of 1934, as amended,
and the rules thereunder, including any attached documents;

	(2)	do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any
such Form 3, 4 or 5, Schedule 13D or 13G, or any amendment(s) thereto and
timely file such form(s) with the SEC and any securities exchange, national
association or similar authority; and

	(3)	take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact, may be
of benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of
Attorney shall be in such form and shall contain such terms and conditions
as such attorney-in-fact may approve in such attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-in-fact, acting
singly, full power and authority to do and perform any and every act and
thing whatsoever requisite, necessary or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if personally present, with
full power of substitution or revocation, hereby ratifying and confirming
all that such attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power
of attorney and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorneys-in-fact, in serving in such
capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 or Regulation 13D-G of the Securities Exchange Act of 1934, as
amended. The undersigned hereby agrees to indemnify the attorneys-in-fact
and the Company from and against any demand, damage, loss, cost or expense
arising from any false or misleading information provided by the
undersigned to the attorneys-in-fact.

	This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file such forms with respect to
the undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.  This Power of Attorney
supersedes any prior power of attorney in connection with the undersigned's
capacity as an officer and/or director of the Company.  This Power of
Attorney shall expire as to any individual attorney-in-fact if such
attorney-in-fact ceases to be an employee of the Company.

	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of March 20, 2024.

					/s/ Victoria Eatwell
					Signature

					Victoria Eatwell
					Print Name