X0306 4 2021-03-30 0 0001866692 Amplitude, Inc. AMPL 0001883039 Sarkis Ninos C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 0 1 0 0 Chief Accounting Officer Class A Common Stock 2021-09-22 4 C 0 27500 0.00 A 27500 D Class B Common Stock 2021-09-22 4 C 0 27500 0.00 D Class A Common Stock 27500 0 D Stock Option (Right to Buy) 4.19 2021-03-30 4 M 0 10000 0.00 D 2030-11-10 Common Stock 10000 67036 D Class B Common Stock 2021-03-30 4 M 0 10000 0.00 A Class A Common Stock 10000 17500 D Stock Option (Right to Buy) 4.19 2021-05-17 4 M 0 10000 0.00 D 2030-11-10 Common Stock 10000 57036 D Class B Common Stock 2021-05-17 4 M 0 10000 0.00 A Class A Common Stock 10000 27500 D 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 or (b) 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). Transaction is being reported herein pursuant to Rule 16a-2(a). The option is early exercisable. 1/48th of the shares subject to the option vest on each monthly anniversary measured from October 26, 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. In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock. /s/ Hoang Vuong, as Attorney-in-Fact for Ninos Sarkis 2021-09-24