X0306 4 2022-02-17 false 0001866692 Amplitude, Inc. AMPL 0001744910 Wong Catherine C/O AMPLITUDE,INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 true false false false Class A Common Stock 2022-02-17 4 S false 740.00 17.5557 D 117230.00 D Class A Common Stock 2022-02-17 4 S false 400.00 18.61 D 116830.00 D Class A Common Stock 2022-02-17 4 S false 1375.00 19.8529 D 115455.00 D Class A Common Stock 2022-02-17 4 S false 800.00 20.8612 D 114655.00 D Class A Common Stock 2022-02-17 4 S false 100.00 21.82 D 114555.00 D Class A Common Stock 2022-02-17 4 S false 100.00 25.02 D 114455.00 D Shares sold to satisfy tax withholding obligations in connection with the vesting of RSUs. This transaction was executed in multiple trades in prices ranging from $17.0600 to $17.9500, 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 101,563 RSUs. This transaction was executed in multiple trades in prices ranging from $18.2800 to $19.0200, 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. This transaction was executed in multiple trades in prices ranging from $19.3600 to $20.2000, 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. This transaction was executed in multiple trades in prices ranging from $20.4200 to $21.2300, 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. /s/ Hoang Vuong, as Attorney-in-Fact for Catherine Wong 2022-02-22