X0306 4 2021-03-30 0 0001866692 Amplitude, Inc. AMPL 0001883031 Vuong Hoang C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 0 1 0 0 Chief Financial Officer Class A Common Stock 2021-09-21 4 C 0 48751 0.00 A 48751 D Class B Common Stock 2021-09-21 4 C 0 48751 0.00 D Class A Common Stock 48751 229500 D Stock Option (Right to Buy) 2.26 2021-03-30 4 M 0 11064 0.00 D 2029-06-04 Common Stock 11064 92176 D Stock Option (Right to Buy) 2.26 2021-03-30 4 M 0 50000 0.00 D 2029-06-04 Common Stock 50000 1513009 D Class B Common Stock 2021-03-30 4 M 0 61064 0.00 A Class A Common Stock 61064 134815 D Stock Option (Right to Buy) 2.26 2021-06-29 4 M 0 11061 0.00 D 2029-06-04 Common Stock 11061 81115 D Stock Option (Right to Buy) 2.26 2021-06-29 4 M 0 50000 0.00 D 2029-06-04 Common Stock 50000 1463009 D Class B Common Stock 2021-06-29 4 M 0 61061 0.00 A Class A Common Stock 61061 195876 D Stock Option (Right to Buy) 2.26 2021-08-24 4 M 0 100000 0.00 D 2029-06-04 Common Stock 100000 1363009 D Class B Common Stock 2021-08-24 4 M 0 100000 0.00 A Class A Common Stock 100000 295876 D Class B Common Stock 2021-08-25 4 S 0 25000 43.57 D Class A Common Stock 25000 270876 D Stock Option (Right to Buy) 2.26 2021-08-29 4 M 0 7375 0.00 D 2029-06-04 Common Stock 7375 73740 D Class B Common Stock 2021-08-29 4 M 0 7375 0.00 A Class A Common Stock 7375 278251 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 being reported herein pursuant to Rule 16a-2(a). 1/48th of the shares subject to the option vest on each monthly anniversary measured from June 4, 2019 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date. The option is early exercisable. 1/48th of the shares subject to the option vest on each monthly anniversary measured from April 29, 2019 (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. The securities were sold in a private secondary sale transaction. /s/ Hoang Vuong 2021-09-23