Casdin Capital, LLC - Mar 21, 2024 Form 4 Insider Report for 2seventy bio, Inc. (TSVT)

Role
Director
Signature
Casdin Capital LLC, By: /s/ Eli Casdin, Managing Member
Stock symbol
TSVT
Transactions as of
Mar 21, 2024
Transactions value $
$3,601,268
Form type
4
Date filed
3/25/2024, 09:44 PM
Previous filing
Mar 25, 2024
Next filing
Mar 28, 2024

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction TSVT Common Stock, par value $0.0001 per share Purchase $1.47M +300K +25.37% $4.90 1.48M Mar 21, 2024 See footnote F1, F2
transaction TSVT Common Stock, par value $0.0001 per share Purchase $754K +147K +9.94% $5.12 1.63M Mar 22, 2024 See footnote F2, F3
transaction TSVT Common Stock, par value $0.0001 per share Purchase $1.67M +330K +20.25% $5.07 1.96M Mar 25, 2024 See footnote F2, F4
holding TSVT Common Stock, par value $0.0001 per share 16.6K Mar 21, 2024 Direct F5, F6

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 Total Return Swap Sale -$298K -63.2K -10.53% $4.72 537K Mar 21, 2024 Common Stock, par value $0.0001 per share 63.2K See footnote F2, F7, F8
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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.
F2 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.
F3 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.
F4 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.
F5 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.
F6 The securities are owned directly by Eli Casdin.
F7 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.
F8 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.

Remarks:

Eli Casdin has been deputized to represent the Reporting Persons on the board of directors of the Issuer. By virtue of Mr. Casdin's representation, for purposes of Section 16 of the Securities Exchange Act of 1934 (the "Exchange Act"), each of the Reporting Persons may be deemed directors by deputization of the Issuer. Each Reporting Person disclaims beneficial ownership in the securities reported on this Form 4 except to the extent of its pecuniary interest, if any, therein, and this report shall not be deemed to be an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.