Sec Form 4 Filing - Accel Growth Fund Investors 2010 L.L.C. @ Squarespace, Inc. - 2021-06-11

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 Accel Growth Fund Investors 2010 L.L.C. 2. Issuer Name and Ticker or Trading Symbol Squarespace, Inc. [ SQSP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 500 UNIVERSITY AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 06/11/2021 (Street) PALO ALTO, CA94301 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 06/11/2021 J( 1 ) 31,250 D $ 0 901,850 D ( 2 ) Class A Common Stock 06/11/2021 J( 3 ) 459,750 D $ 0 13,267,996 I Accel Growth Fund L.P. ( 4 ) Class A Common Stock 06/11/2021 J( 5 ) 9,000 D $ 0 259,729 I Accel Growth Fund Strategic Partners L.P. ( 6 ) Class A Common Stock 06/14/2021 J( 1 ) 31,250 D $ 0 870,600 D ( 2 ) Class A Common Stock 06/14/2021 J( 3 ) 459,750 D $ 0 12,808,246 I Accel Growth Fund L.P. ( 4 ) Class A Common Stock 06/14/2021 J( 5 ) 9,000 D $ 0 250,729 I Accel Growth Fund Strategic Partners L.P. ( 6 ) Class A Common Stock 530,953 I Accel Leaders 3 L.P. ( 7 ) Class A Common Stock 21,982 I Accel Leaders 3 Entrepreneurs L.P ( 8 ) Class A Common Stock 31,686 I Accel Leaders 3 Investors (2020) L.P. ( 9 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Accel Growth Fund Investors 2010 L.L.C. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Growth Fund L.P. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Growth Fund Strategic Partners L.P. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Growth Fund Associates L.L.C. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Leaders 3 GP Associates L.L.C. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Leaders 3 L.P. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Leaders 3 Entrepreneurs L.P. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Accel Leaders 3 Investors (2020) L.P. 500 UNIVERSITY AVENUE PALO ALTO, CA94301 X Signatures /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date /s/ Tracy L. Sedlock, as attorney in fact 06/15/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Accel Growth Fund Investors 2010 L.L.C. distributed, for no consideration, 31,250 shares of Class A Common Stock of the Issuer to its members, representing each such member's pro rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended. ( 2 )The shares are held of record by Accel Growth Fund Investors 2010 L.L.C. Andrew Braccia, Kevin Efrusy, Sameer Gandhi, Ping Li, Tracy Sedlock and Richard Wong are the managing members of Accel Growth Fund Investors 2010 L.L.C. Each managing member disclaims beneficial ownership except to the extent of their pecuniary interest therein. ( 3 )Accel Growth Fund L.P. distributed, for no consideration, 459,750 shares of Class A Common Stock of the Issuer to its partners, representing each such partner's pro rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended. ( 4 )The shares are held of record by Accel Growth Fund L.P. Accel Growth Fund Associates L.L.C. ("AGFA") is the general partner of Accel Growth Fund L.P. Andrew Braccia, Kevin Efrusy, Sameer Gandhi, Ping Li, Tracy Sedlock and Richard Wong are the managing members of AGFA. Each managing member disclaims beneficial ownership except to the extent of their pecuniary interest therein. ( 5 )Accel Growth Fund Strategic Partners L.P. distributed, for no consideration, 9,000 shares of Class A Common Stock of the Issuer to its partners, representing each such partner's pro rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended. ( 6 )The shares are held of record by Accel Growth Fund Strategic Partners L.P. AGFA is the general partner of Accel Growth Fund Strategic Partners L.P. Andrew Braccia, Kevin Efrusy, Sameer Gandhi, Ping Li, Tracy Sedlock and Richard Wong are the managing members of AGFA. Each managing member disclaims beneficial ownership except to the extent of their pecuniary interest therein. ( 7 )The shares are held of record by Accel Leaders 3 L.P. Accel Leaders 3 GP Associates L.L.C. ("AL3A") is the general partner of the general partner of Accel Leaders 3 L.P. Andrew Braccia, Sameer Gandhi, Ping Li, Tracy Sedlock, Ryan Sweeney and Richard Wong are the directors of AL3A. Each director disclaims ownership of all such shares except to the extent that he has a pecuniary interest therein. ( 8 )The shares are held of record by Accel Leaders 3 Entrepreneurs L.P. AL3A is the general partner of the general partner of Accel Leaders 3 Entrepreneurs L.P. Andrew Braccia, Sameer Gandhi, Ping Li, Tracy Sedlock, Ryan Sweeney and Richard Wong are the directors of AL3A. Each director disclaims ownership of all such shares except to the extent that he has a pecuniary interest therein. ( 9 )The shares are held of record by Accel Leaders 3 Investors (2020) L.P. AL3A is the general partner of Accel Leaders 3 Investors (2020) L.P. Andrew Braccia, Sameer Gandhi, Ping Li, Tracy Sedlock, Ryan Sweeney and Richard Wong are the directors of AL3A. Each director disclaims ownership of all such shares except to the extent that he has a pecuniary interest therein.

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