X0609 4 2026-07-08 false 0001866692 Amplitude, Inc. AMPL 0001883022 Liu Curtis false C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 true true true false Chief Technology Officer false Class B Common Stock 2026-07-08 4 G false 175000.00 0.00 D Class A Common Stock 175000.00 7207208.00 I By Trust Class B Common Stock 2026-07-08 4 G false 175000.00 0.00 A Class A Common Stock 175000.00 175000.00 I By Spouse The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period). This transaction involved a gift of securities by the trust to the reporting person's spouse. This is not a market transaction, thus no price has been reported. No value was received for the gifted shares. Securities held by a trust over which the reporting person exercises voting and dispositive control. /s/ Elizabeth Fisher, as attorney in fact for Curtis Liu 2026-07-10