X0508 4 2026-03-06 false 0001866692 Amplitude, Inc. AMPL 0001883022 Liu Curtis C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 true true true false Chief Technology Officer true Class A Common Stock 2026-03-06 4 S false 33201.00 8.007 D 603756.00 D The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on November 26, 2025. This transaction was executed in multiple trades at prices ranging from $8.00 to $8.04. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. Includes 568,585 restricted stock units. /s/ Elizabeth Fisher, as attorney in fact for Liu Curtis 2026-03-10