144/A 0001950047-26-005369 0001883022 XXXXXXXX LIVE 0001866692 Amplitude, Inc. 001-40817 201 THIRD STREET, SUITE 200 SAN FRANCISCO CA 94103 (415) 231-2353 Liu Curtis Officer Director 10% Stockholder Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

22786 178186.52 103867086 06/01/2026 NASDAQ Common 05/15/2026 Restricted Stock Units Issuer N 22786 05/15/2026 N/A N 10b5-1 Sales for CURTIS LIU

201 Third Street, Suite 200 San Francisco CA 94103

Common 05/04/2026 17586 142877.46 10b5-1 Sales for CURTIS LIU

201 Third Street, Suite 200, San Francisco CA 94103

Common 03/06/2026 33201 265838.82 10b5-1 Sales for CURTIS LIU

01 Third Street, Suite 200, San Francisco CA 94103

Common 03/05/2026 30061 240538.91 The 144 form is amended to update the share amount to 22,786. 06/12/2026 11/26/2025 /s/ Curtis Liu