Sec Form 4 Filing - GPI Capital Gemini HoldCo LP @ Couchbase, Inc. - 2021-07-26

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 GPI Capital Gemini HoldCo LP 2. Issuer Name and Ticker or Trading Symbol Couchbase, Inc. [ BASE] 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) 1345 AVENUE OF THE AMERICAS, FLOOR 32, SUITE C 3. Date of Earliest Transaction (MM/DD/YY) 07/26/2021 (Street) NEW YORK, NY10105 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 Common Stock 07/26/2021 C 4,369,543 A 4,369,543 D ( 2 )

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 Series G Preferred Stock ( 1 ) 07/26/2021 C 4,096,192 ( 1 ) ( 1 ) Common Stock 4,369,543 $ 0 0 D ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GPI Capital Gemini HoldCo LP 1345 AVENUE OF THE AMERICAS FLOOR 32, SUITE C NEW YORK, NY10105 X Signatures GPI Capital Gemini HoldCo LP, By: Mateo Goldman, as Attorney in Fact 07/26/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Immediately prior to the completion of the Issuer's initial public offering, each share of Series G Preferred Stock is convertible into shares of the Issuer's Common Stock, par value $0.00001 per share, on a 1.06673317089756-for-one basis and has no expiration date. ( 2 )GPI Capital LLC is the sole member of GPI GP Limited, which is the general partner of GPI GP LP, which is the general partner of GPI Capital Gemini HoldCo LP, or GPI. Aleksander J. Migon is a member of the Issuer's board of directors and Messrs. Migon, William T. Royan and Khai Ha are Managing Partners and members of the Investment Committee of GPI Capital, LLC and may be deemed to have shared voting, investment and dispositive power with respect to the shares held by GPI. Messrs. Migon, Royan and Ha disclaim beneficial ownership of such shares except to the extent of their pecuniary interest therein. The address for GPI is 1345 Avenue of the Americas, 32nd Floor, New York, New York 10105.

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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