Sec Form 3 Filing - EFRUSY KEVIN @ Couchbase, Inc. - 2021-07-21

FORM 3 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) 07/21/2021 (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 264,330 I By: Accel X L.P. ( 1 ) ( 2 ) Common Stock 20,023 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Common Stock 339,725 I By: Accel Growth Fund II L.P. ( 1 ) ( 2 ) Common Stock 24,600 I By: Accel Growth Fund II Strategic Partners L.P. ( 1 ) ( 2 ) Common Stock 36,466 I By: Accel Growth Fund Investors 2013 L.L.C. ( 1 ) ( 2 ) Common Stock 27,633 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 )

< td> Series D Preferred Stock 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 A Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 1,636,046 I By: Accel X L.P. ( 1 ) ( 2 ) Series A Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 123,978 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series A Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 171,097 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) Series B Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 874,690 I By: Accel X L.P. ( 1 ) ( 2 ) Series B Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 66,283 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series B Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 91,474 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) Series C Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 336,658 I By: Accel X L.P. ( 1 ) ( 2 ) Series C Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 25,511 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series C Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 35,207 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) $ 0 ( 3 ) ( 3 ) Common Stock 279,944 I By: Accel X L.P. ( 1 ) ( 2 ) Series D Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 21,214 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series D Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 29,276 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 130,898 I By: Accel X L.P. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 9,919 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 1,083,886 I By: Accel Growth Fund II L.P. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 78,516 I By: Accel Growth Fund II Strategic Partners L.P. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 116,368 I By: Accel Growth Fund Investors 2013 L.L.C. ( 1 ) ( 2 ) Series E Preferred Stock $ 0 ( 4 ) ( 4 ) Common Stock 13,689 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 92,672 I By: Accel X L.P. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 7,022 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 155,124 I By: Accel Growth Fund II L.P. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 11,237 I By: Accel Growth Fund II Strategic Partners L.P. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 16,654 I By: Accel Growth Fund Investors 2013 L.L.C. ( 1 ) ( 2 ) Series F Preferred Stock $ 0 ( 3 ) ( 3 ) Common Stock 9,691 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 216,371 I By: Accel X L.P. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 16,396 I By: Accel X Strategic Partners L.P. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 362,181 I By: Accel Growth Fund II L.P. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 26,236 I By: Accel Growth Fund II Strategic Partners L.P. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 38,884 I By: Accel Growth Fund Investors 2013 L.L.C. ( 1 ) ( 2 ) Series G Preferred Stock $ 0 ( 5 ) ( 5 ) Common Stock 22,628 I By: Accel Investors 2008 L.L.C. ( 1 ) ( 2 )

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 07/21/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Kevin J. Efrusy is a Managing Member of Accel X Associates L.L.C., or A10A, which 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 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 share such powers. Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan J. Sweeney and Richard P. Wong are the Managing Members of Accel Growth Fund Investors 2013 L.L.C., ( 2 )(continuation of FN 1): and therefore share the voting and investment powers. Each general partner or manager 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. ( 3 )Immediately prior to the completion of the Issuer's initial public offering, each share of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series F Preferred Stock is convertible into shares of the Issuer's Common Stock, par value $0.00001 per share, on a one-for-one basis and has no expiration date. ( 4 )Immediately prior to the completion of the Issuer's initial public offering, each share of Series E Preferred Stock is convertible into shares of the Issuer's Common Stock, par value $0.00001 per share, on a 1.05279880234039-for-one basis and has no expiration date. ( 5 )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 an expected 1.06673317089756-for-one basis and has no expiration date.

Remarks: Exhibit 24 - Power of Attorney

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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