X0306 4 2021-07-26 1 0001845022 Couchbase, Inc. BASE 0001573272 Mayfield XIII, a Cayman Islands Exempted Limited Partnership 2484 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001573273 Mayfield XIII Management (EGP), L.P., a Cayman Islands Exempted Limited Partnership C/O MAYFIELD, 2484 SAND HILL ROAD MENLO PARK 94025 0 0 1 0 0001573274 Mayfield XIII Management (UGP), Ltd., a Cayman Islands Exempted Co. C/O MAYFIELD, 2484 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 Common Stock 2021-07-26 4 C 0 3251435 A 3341480 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series B Preferred Stock 2021-07-26 4 C 0 1909090 0.00 D Common Stock 1909090 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series C Preferred Stock 2021-07-26 4 C 0 715278 0.00 D Common Stock 715278 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series D Preferred Stock 2021-07-26 4 C 0 258017 0.00 D Common Stock 258017 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series E Preferred Stock 2021-07-26 4 C 0 120645 0.00 D Common Stock 127014 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series F Preferred Stock 2021-07-26 4 C 0 169212 0.00 D Common Stock 169212 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Series G Preferred Stock 2021-07-26 4 C 0 68269 0.00 D Common Stock 72824 0 I Mayfield XIII, a Cayman Islands Exempted Limited Partnership Immediately prior to the closing of the Issuer's initial public offering, each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock, and Series F Preferred Stock automatically converted into shares of the Issuer's Common Stock on a one-for-one basis, each share of Series E Preferred Stock automatically converted into shares of the Issuer's Common Stock on a 1.05279880234039-for-one basis, and each share of Series G Preferred Stock automatically converted into shares of the Issuer's Common Stock on a 1.06673317089756 basis. The preferred stock has no expiration date. These shares are held of record by Mayfield XIII, a Cayman Islands Exempted Limited Partnership, or MF XIII. Mayfield XIII Management (UGP), Ltd., a Cayman Islands Exempted Company, or MF XIII UGP, is the general partner of Mayfield XIII Management (EGP), L.P., a Cayman Islands Exempted Limited Partnership, which is the general partner of MF XIII. Rajeev Batra, Navin Chaddha and Vaneeta Varma are the directors of MF XIII UGP. As a result, each of the foregoing entities and individuals may be deemed to share beneficial ownership of the shares owned by MF XIII, but each such entity or person disclaims such beneficial ownership except to the extent of its or their pecuniary interest therein. Mayfield XIII, a Cayman Islands Exempted Limited Partnership, By: Mayfield XIII Management (EGP), L.P., its general partner, By: Mayfield XIII Management (UGP), Ltd., its general partner, By: /s/ Paul Kohli, Authorized Signatory 2021-07-26 Mayfield XIII Management (EGP), L.P., By: Mayfield XIII Management (UGP), Ltd., its general partner, By: /s/ Paul Kohli, Authorized Signatory 2021-07-26 Mayfield XIII Management (UGP), Ltd., By: /s/ Paul Kohli, Authorized Signatory 2021-07-26