X0306 4 2021-07-26 0 0001845022 Couchbase, Inc. BASE 0001419457 Accel X LP 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001430231 ACCEL X STRATEGIC PARTNERS LP 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001494996 Accel X Associates L.L.C. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001494980 Accel Investors 2008 L.L.C. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001522762 Accel Growth Fund II L.P. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001527382 Accel Growth Fund II Strategic Partners L.P. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001531131 Accel Growth Fund II Associates L.L.C. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 0001611478 Accel Growth Fund Investors 2013 L.L.C. 500 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 Common Stock 2021-07-26 4 C 0 3588629 A 3852959 D Common Stock 2021-07-26 4 C 0 271940 A 291963 I By: Accel X Strategic Partners L.P. Common Stock 2021-07-26 4 C 0 1682587 A 2022312 I By: Accel Growth Fund II L.P. Common Stock 2021-07-26 4 C 0 121884 A 146484 I By: Accel Growth Fund II Strategic Partners L.P. Common Stock 2021-07-26 4 C 0 180644 A 217110 I By: Accel Growth Fund Investors 2013 L.L.C. Common Stock 2021-07-26 4 C 0 375294 A 402927 I By: Accel Investors 2008 L.L.C. Series A Preferred Stock 2021-07-26 4 C 0 1636046 0.00 D Common Stock 1636046 0 D Series A Preferred Stock 2021-07-26 4 C 0 123978 0.00 D Common Stock 123978 0 I By: Accel X Strategic Partners L.P. Series A Preferred Stock 2021-07-26 4 C 0 171097 0.00 D Common Stock 171097 0 I By: Accel Investors 2008 L.L.C. Series B Preferred Stock 2021-07-26 4 C 0 874690 0.00 D Common Stock 874690 0 D Series B Preferred Stock 2021-07-26 4 C 0 66283 0.00 D Common Stock 66283 0 I By: Accel X Strategic Partners L.P. Series B Preferred Stock 2021-07-26 4 C 0 91474 0.00 D Common Stock 91474 0 I By: Accel Investors 2008 L.L.C. Series C Preferred Stock 2021-07-26 4 C 0 336658 0.00 D Common Stock 336658 0 D Series C Preferred Stock 2021-07-26 4 C 0 25511 0.00 D Common Stock 25511 0 I By: Accel X Strategic Partners L.P. Series C Preferred Stock 2021-07-26 4 C 0 35207 0.00 D Common Stock 35207 0 I By: Accel Investors 2008 L.L.C. Series D Preferred Stock 2021-07-26 4 C 0 279944 0.00 D Common Stock 279944 0 D Series D Preferred Stock 2021-07-26 4 C 0 21214 0.00 D Common Stock 21214 0 I By: Accel X Strategic Partners L.P. Series D Preferred Stock 2021-07-26 4 C 0 29276 0.00 D Common Stock 29276 0 I By: Accel Investors 2008 L.L.C. Series E Preferred Stock 2021-07-26 4 C 0 130898 0.00 D Common Stock 137809 0 D Series E Preferred Stock 2021-07-26 4 C 0 9919 0.00 D Common Stock 10442 0 I By: Accel X Strategic Partners L.P. Series E Preferred Stock 2021-07-26 4 C 0 1083886 0.00 D Common Stock 1141113 0 I By: Accel Growth Fund II L.P. Series E Preferred Stock 2021-07-26 4 C 0 78516 0.00 D Common Stock 82661 0 I By: Accel Growth Fund II Strategic Partners L.P. Series E Preferred Stock 2021-07-26 4 C 0 116368 0.00 D Common Stock 122512 0 I By: Accel Growth Fund Investors 2013 L.L.C. Series E Preferred Stock 2021-07-26 4 C 0 13689 0.00 D Common Stock 14411 0 I By: Accel Investors 2008 L.L.C. Series F Preferred Stock 2021-07-26 4 C 0 92672 0.00 D Common Stock 92672 0 D Series F Preferred Stock 2021-07-26 4 C 0 7022 0.00 D Common Stock 7022 0 I By: Accel X Strategic Partners L.P. Series F Preferred Stock 2021-07-26 4 C 0 155124 0.00 D Common Stock 155124 0 I By: Accel Growth Fund II L.P. Series F Preferred Stock 2021-07-26 4 C 0 11237 0.00 D Common Stock 11237 0 I By: Accel Growth Fund II Strategic Partners L.P. Series F Preferred Stock 2021-07-26 4 C 0 16654 0.00 D Common Stock 16654 0 I By: Accel Growth Fund Investors 2013 L.L.C. Series F Preferred Stock 2021-07-26 4 C 0 9691 0.00 D Common Stock 9691 0 I By: Accel Investors 2008 L.L.C. Series G Preferred Stock 2021-07-26 4 C 0 216371 0.00 D Common Stock 230810 0 D Series G Preferred Stock 2021-07-26 4 C 0 16396 0.00 D Common Stock 17490 0 I By: Accel X Strategic Partners L.P. Series G Preferred Stock 2021-07-26 4 C 0 362181 0.00 D Common Stock 386350 0 I By: Accel Growth Fund II L.P. Series G Preferred Stock 2021-07-26 4 C 0 26236 0.00 D Common Stock 27986 0 I By: Accel Growth Fund II Strategic Partners L.P. Series G Preferred Stock 2021-07-26 4 C 0 38884 0.00 D Common Stock 41478 0 I By: Accel Growth Fund Investors 2013 L.L.C. Series G Preferred Stock 2021-07-26 4 C 0 22628 0.00 D Common Stock 24138 0 I By: Accel Investors 2008 L.L.C. 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. 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. 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. 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., (continuation of FN 2): 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. /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X L.P. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X Strategic Partners L.P. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X Associates L.L.C. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Investors 2008 L.L.C. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II L.P. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II Strategic Partners L.P. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II Associates L.L.C. 2021-07-26 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund Investors 2013 L.L.C. 2021-07-26