Casdin Capital, LLC - Mar 20, 2024 Form 3 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 20, 2024
Transactions value $
$0
Form type
3
Date filed
3/25/2024, 09:03 PM
Previous filing
Mar 6, 2024
Next filing
Mar 25, 2024

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding TSVT Common Stock, par value $0.0001 per share 1.18M Mar 20, 2024 See footnote F1
holding TSVT Common Stock, par value $0.0001 per share 16.6K Mar 20, 2024 Direct F2, F3

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
holding TSVT Stock Options (Right to buy) Mar 20, 2024 Common Stock, par value $0.0001 per share 33.4K $4.54 Direct F3, F4
holding TSVT Total Return Swap Mar 20, 2024 Common Stock, par value $0.0001 per share 600K See footnote F1, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The securities are owned directly by Casdin Partners Master Fund, LP (the "Master Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC, the investment adviser to the Master Fund, (ii) Casdin Partners GP, LLC, the general partner of the Master Fund, and (ii) Eli Casdin, the managing member of Casdin Capital, LLC and Casdin Partners GP, LLC.
F2 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.
F3 The securities are owned directly by Eli Casdin.
F4 This stock option vests ratably 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.
F5 The Master Fund has entered into certain cash-settled total return swap agreements (the "Swap Agreements"), which represent economic exposure to an aggregate of 599,935.15 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.

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 3 except to the extent of its or his 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.