X0508 4 2025-09-15 false 0001866692 Amplitude, Inc. AMPL 0001542687 Schultz Erica C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 true false false false true Class A Common Stock 2025-09-15 4 M false 10000.00 4.19 A 117406.00 D Class A Common Stock 2025-09-15 4 S false 10000.00 11.0633 D 107406.00 D Stock Option (Right to Buy) 4.19 2025-09-15 4 M false 10000.00 0.00 D 2030-12-15 Class A Common Stock 10000.00 79500.00 D The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on March 12, 2025. This transaction was executed in multiple trades at prices ranging from $10.8500 to $11.3100. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The option is early exercisable. 1/48th of the shares subject to the option vest on each monthly anniversary measured from December 10, 2020 (the"Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested on the fourth anniversary of the Vesting Commencement Date. 9/15/25-exercise and sale per 10b5-1 plan /s/ Elizabeth Fisher, as attorney in fact for Schultz Erica 2025-09-17