Sec Form 4 Filing - Casalena Anthony @ Squarespace, Inc. - 2024-10-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Casalena Anthony 2. Issuer Name and Ticker or Trading Symbol Squarespace, Inc. [ SQSP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O SQUARESPACE, INC.,, 225 VARICK STREET, 12TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/17/2024 (Street) NEW YORK, NY10014 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 10/17/2024 D( 1 ) 880,909 D 0 I See footnote ( 2 ) Class A Common Stock 10/17/2024 J( 3 ) 387,500 D 0 I See footnote ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B Common Stock ( 5 ) 10/17/2024 S( 6 ) 12,329,784 ( 5 ) ( 5 ) Class A Common Stock 12,329,784 $ 46.5 28,505,788 I See footnote ( 2 ) Class B Common Stock ( 5 ) 10/17/2024 J( 3 ) 28,505,788 ( 5 ) ( 5 ) Class A Common Stock 28,505,788 ( 3 ) 0 I See footnote ( 2 ) Class B Common Stock ( 5 ) 10/17/2024 J( 3 ) 2,050,838 ( 5 ) ( 5 ) Class A Common Stock 2,050,838 ( 3 ) 0 I See footnote ( 4 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Casalena Anthony C/O SQUARESPACE, INC., 225 VARICK STREET, 12TH FLOOR NEW YORK, NY10014 X X Chief Executive Officer Signatures /s/ Jessica Krasner, as Attorney-in-Fact 10/17/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Amended and Restated Agreement and Plan of Merger (the "Merger Agreement"), dated as of September 9, 2024, by and among the Issuer, Spaceship Purchaser, Inc. ("Parent") and Spaceship Group MergerCo Inc., a wholly owned subsidiary of Parent, immediately prior to the effective time of the Merger (as defined in the Merger Agreement), each share of Class A Common Stock and Class B Common Stock (together, "Common Stock") of the Issuer that is outstanding as of immediately prior to the effective time of the Merger (other than Owned Company Shares or Dissenting Company Shares, each as defined in the Merger Agreement) was cancelled and extinguished and automatically converted into the right to receive cash in an amount equal to $46.50, without interest thereon. ( 2 )The shares are held of record by the Anthony Casalena Revocable Trust. ( 3 )Pursuant to the Amended and Restated Tender and Support Agreement, dated as of October 8, 2024, by and among the reporting person, Anthony Casalena 2019 Family Trust, Anthony Casalena Revocable Trust and Casalena Foundation (collectively, the "Stockholders"), the Issuer and Parent, immediately prior to the effective time of the Merger, the Stockholders contributed certain shares of Common Stock to a limited partnership that indirectly owns 100% of the equity interests of Parent ("Topco") in exchange for equity interests in Topco. ( 4 )The shares are held of record by the Anthony Casalena 2019 Family Trust. ( 5 )Each share of the Issuer's Class B Common Stock is convertible into one share of the Issuer's Class A Common Stock upon the option of the holder and has no expiration date. ( 6 )Represents the securities sold to Topco for $46.50 per share.

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 4(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).

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