X0407 4 2023-05-18 false 0001866692 Amplitude, Inc. AMPL 0001720216 Harms Christopher C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 false true false false Chief Financial Officer false Class A Common Stock 2023-05-18 4 S false 14666.00 9.1141 D 393391.00 D Pursuant to a mandatory sell-to-cover provision under the Issuer's 2021 Incentive Award Plan, the shares were sold upon the vesting of restricted stock units ("RSUs") solely to cover applicable withholding taxes. This transaction was executed in multiple trades at prices ranging from $8.87 to $9.40, inclusive. 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 374,052 RSUs. /s/ Elizabeth Fisher, as attorney in fact for Christopher Harms 2023-05-19