X0306 4 2023-03-13 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 2023-03-13 4 J 0 847205 0.00 D 3005754 D Common Stock 2023-03-13 4 J 0 64198 0.00 D 227765 I By: Accel X Strategic Partners L.P. Common Stock 2023-03-13 4 J 0 88597 0.00 D 314330 I By: Accel Investors 2008 L.L.C. Common Stock 2022312 I By: Accel Growth Fund II L.P. Common Stock 146484 I By: Accel Growth Fund II Strategic Partners L.P. Common Stock 217110 I By: Accel Growth Fund Investors 2013 L.L.C. On March 13, 2023, Accel X LP distributed, for no consideration, 847,205 shares of Common Stock of the Issuer (the "Accel X LP Shares") to its limited partners and general partner, which shares were further distributed, representing each such partner's pro rata interest in such Accel X LP 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. On March 13, 2023, Accel X Strategic Partners L.P. ("A10SP") distributed, for no consideration, 64,198 shares of Common Stock of the Issuer (the "A10SP Shares") to its limited partners and general partner, which shares were further distributed, representing each such partner's pro rata interest in such A10SP 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. 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. On March 13, 2023, Accel Investors 2008 L.L.C. ("AI08") distributed for no consideration 88,597 shares of Common Stock of the Issuer (the "AI08 Shares") to its limited partners, representing each such partner's pro rata interest in such AI08 Shares. All of the aforementioned distributions were made in accordance with the exceptions afforded by Rules 16a-13 and 16a-9 of the Securities and Exchange Act of 1934, as amended. /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X L.P. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X Strategic Partners L.P. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel X Associates L.L.C. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Investors 2008 L.L.C. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II L.P. 2023-03-13 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II Strategic Partners L.P. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund II Associates L.L.C. 2023-03-15 /s/ Tracy L. Sedlock, as Attorney in Fact for Accel Growth Fund Investors 2013 L.L.C. 2023-03-15