144 0001883022 XXXXXXXX LIVE 0001866692 AMPLITUDE INC. 001-40817 201 Third Street, Suite 200 San Francisco CA 94103 4152312353 CURTIS LIU Director Officer 10% Stockholder Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

80848 624146.56 104143565 03/05/2026 NASDAQ Common 05/15/2025 Restricted Stock Units Issuer N 80848 05/15/2025 N/A Y The securities to be sold were acquired upon the vesting of restricted stock units during the period of 05/15/2025 through 02/15/2026. 03/05/2026 11/26/2025 /s/ Curtis Liu