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Filing Details

Accession Number:: 0000919574-24-002176
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2024-03-25 21:44:59
Reporting Period:: 2024-03-21

Accepted Time:: 2024-03-25 21:44:59
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1860782	2Seventy Bio Inc.	TSVT	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1534260	Casdin Partners Gp, Llc	1350 Avenue Of The Americas Suite 2600 New York NY 10019	Yes	No	No	No
1534261	Casdin Capital, Llc	1350 Avenue Of The Americas Suite 2600 New York NY 10019	Yes	No	No	No
1534264	Eli Casdin	1350 Avenue Of The Americas Suite 2600 New York NY 10019	Yes	No	No	No
1534265	Casdin Partners Master Fund, L.p.	1350 Avenue Of The Americas Suite 2600 New York NY 10019	Yes	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.0001 Per Share	Acquisiton	2024-03-21	300,000	$4.90	1,482,623	No	4	P	Indirect	See footnote
Common Stock, Par Value $0.0001 Per Share	Acquisiton	2024-03-22	147,377	$5.12	1,630,000	No	4	P	Indirect	See footnote
Common Stock, Par Value $0.0001 Per Share	Acquisiton	2024-03-25	330,000	$5.07	1,960,000	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See footnote
No	4	P	Indirect	See footnote
No	4	P	Indirect	See footnote

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock, Par Value $0.0001 Per Share	Total Return Swap	Disposition	2024-03-21	63,151	$4.72	63,151	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
536,784			Yes	4	S	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, Par Value $0.0001 Per Share	16,600	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $4.63 to $5. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.
The securities are owned directly by Casdin Partners Master Fund, L.P. (the "Master Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC, the investment adviser to the Master Fund ("Casdin"), (ii) Casdin Partners GP, LLC, the general partner of the Master Fund (the "GP"), and (iii) Eli Casdin, the managing member of Casdin and the GP.
The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $4.93 to $5.21. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.
The price reported in Column 4 is a weighted average price. These shares were bought in multiple transactions within the range of $4.87 to $5.55. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares bought at each separate price within the range set forth in this footnote.
This restricted stock unit award vests ratable over three years in annual installments with the first installment vesting on March 20, 2025, subject to the Reporting Person's continued service through the applicable vesting date.
The securities are owned directly by Eli Casdin.
The Master Fund has entered into certain cash-settled total return swap agreements (the "Swap Agreements"), which represent, after the transaction reported herein, economic exposure to an aggregate of 536,784.15 notional shares of the Issuer's Common Stock, par value $0.0001 per share. The Swap Agreements provide the Master Fund with economic results that are comparable to the economic results of ownership but do not provide it with the power to vote or direct the voting or dispose of or direct the disposition of the securities that are referenced by the Swap Agreements.
The price reported in Column 7 is a weighted average price. These securities were sold in multiple transactions within the range of $4.62 to $4.84. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote.