Sec Form 4 Filing - EFRUSY KEVIN @ Couchbase, Inc. - 2023-09-18

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 EFRUSY KEVIN 2. Issuer Name and Ticker or Trading Symbol Couchbase, Inc. [ BASE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 3250 OLCOTT ST. 3. Date of Earliest Transaction (MM/DD/YY) 09/18/2023 (Street) SANTA CLARA, CA95054 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 09/18/2023 S 635,400 D $ 17.71 2,370,354 I By: Accel X L.P; ( 1 ) Common Stock 09/18/2023 S 48,150 D $ 17.71 179,615 I By: Accel X Strategic Partners L.P. ( 1 ) Common Stock 09/18/2023 S 66,450 D $ 17.71 247,880 I By: Accel Investors 2008 L.L.C. ( 1 ) Common Stock 13,364 I By: The Efrusy Family Trust u/a/d 10/21/2005 ( 2 ) Common Stock 2,022,312 I By: Accel Growth Fund II L.P. ( 1 ) Common Stock 146,484 I By: Accel Growth Fund II Strategic Partners L.P. ( 1 ) Common Stock 217,110 I By: Accel Growth Fund Investors 2013 L.L.C. ( 1 ) Common Stock 21,533 ( 3 ) D

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 EFRUSY KEVIN 3250 OLCOTT ST. SANTA CLARA, CA95054 X X Signatures /s/ Margaret Chow, by Power of Attorney for Kevin Efrusy 09/20/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Accel X Associates L.L.C. ("A10A") is the General Partner of both Accel X L.P. and Accel X Strategic Partners L.P., and has the sole voting and investment power. Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock and Richard P. Wong are the Managing Members of A10A and Accel Investors 2008 L.L.C., and therefore share the voting and investment powers. Accel Growth Fund II Associates L.L.C., or AGF2A, is the General Partner of both Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P., and has the sole voting and investment power. Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan J. Sweeney and Richard P. Wong are the Managing Members of AGF2A and Accel Growth Fund Investors 2013 L.L.C. and share such powers. Each person disclaims beneficial ownership except to the extent of their pecuniary interest therein. The address for all Accel entities listed above is 500 University Avenue, Palo Alto, California 94301. ( 2 )Shares held by The Efrusy Family Trust u/a/d 10/21/2005 (the "Trust"), of which Mr. Efrusy is a Trustee. The Reporting Person disclaims beneficial ownership over the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended. ( 3 )Represents restricted stock units ("RSUs") of the Issuer. Each unit represents a contingent right to receive one share of the Issuer's common stock upon vesting. 11,659 of the RSUs are fully-vested and one hundred percent (100%) of the remaining 9,874 RSUs will vest on the earlier of (i) June 1, 2024 or (ii) the day prior to the Issuer's 2024 annual meeting of stockholders, subject to the Reporting Person's continued service through each such vesting date.

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).

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