X0407 4 2023-03-21 0 0001866692 Amplitude, Inc. AMPL 0001870316 Battery Partners XI, LLC ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001869817 Battery Partners XI Side Fund, LLC ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001665602 Battery Investment Partners XI, LLC ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001665600 Battery Ventures XI-A Side Fund, L.P. ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001665603 Battery Ventures XI-A, L.P. ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001665599 Battery Ventures XI-B Side Fund, L.P. ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0001665601 Battery Ventures XI-B, L.P. ONE MARINA PARK DRIVE, SUITE 1100 BOSTON MA 02210 0 0 1 0 0 Class A Common Stock 2023-03-21 4 J 0 36000 0.00 D 154579 I By Battery Investment Partners XI, LLC Class A Common Stock 2023-03-21 4 J 0 776762 0.00 D 3335348 I By Battery Ventures XI-A, L.P. Class A Common Stock 2023-03-21 4 J 0 807008 0.00 D 3465221 I By Battery Ventures XI-A Side Fund, L.P. Class A Common Stock 2023-03-21 4 J 0 205238 0.00 D 881274 I By Battery Ventures XI-B, L.P. Class A Common Stock 2023-03-21 4 J 0 174992 0.00 D 751403 I By Battery Ventures XI-B Side Fund, L.P. Class A Common Stock 2023-03-21 4 J 0 186943 0.00 A 186943 I By Battery Partners XI, LLC Class A Common Stock 2023-03-21 4 J 0 186943 0.00 D 0 I By Battery Partners XI, LLC Class A Common Stock 2023-03-21 4 J 0 186952 0.00 A 186952 I By Battery Partners XI Side Fund, LLC Class A Common Stock 2023-03-21 4 J 0 186952 0.00 D 0 I By Battery Partners XI Side Fund, LLC Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Investment Partners XI, LLC ("BIP XI") to its members without additional consideration. Shares held by BIP XI. Battery Partners XI, LLC ("BP XI") is the managing member of BIP XI and may be deemed to beneficially own the shares held by BIP XI. BP XI disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of for any other purpose. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-A, L.P. ("BV XI-A") to its general partner and limited partners without additional consideration. Shares held by BV XI-A. BP XI is the general partner of BV XI-A and may be deemed to beneficially own the shares held by BV XI-A. BP XI disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of for any other purpose. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-A Side Fund, L.P. ("BV XI-A SF") to its general partner and limited partners without additional consideration. Shares held by BV XI-A SF. Battery Partners XI Side Fund, LLC ("BP XI SF") is the general partner of BV XI-A SF and may be deemed to beneficially own the shares held by BV XI-A SF. BP XI SF disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of for any other purpose. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-B, L.P. ("BV XI-B") to its general partner and limited partners without additional consideration. Shares held by BV XI-B. BP XI is the general partner of BV XI-B and may be deemed to beneficially own the shares held by BV XI-B. BP XI disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of for any other purpose. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-B Side Fund, L.P. ("BV XI-B SF") to its general partner and limited partners without additional consideration. Shares held by BV XI-B SF. BP XI SF is the general partner of BV XI-B SF and may be deemed to beneficially own the shares held by BV XI-B SF. BP XI SF disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of for any other purpose. Represents receipt of shares in the distribution in kind described in footnotes (3) and (7). Shares held by BP XI. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by BP XI to its members without consideration. Represents receipt of shares in the distribution in kind described in footnotes (5) and (9). Shares held by BP XI SF. Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by BP XI SF to its members without consideration. /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Partners XI, LLC 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Partners XI Side Fund, LLC 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Investment Partners XI, LLC 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Ventures XI-A Side Fund, L.P. 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Ventures XI-A, L.P. 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Ventures XI-B Side Fund, L.P. 2023-03-23 /s/ Christopher Schiavo, as Attorney-in-Fact for Battery Ventures XI-B, L.P. 2023-03-23