X0306 4 2021-12-13 0 0001866692 Amplitude, Inc. AMPL 0001882913 Skates Spenser C/O AMPLITUDE, INC. 201 THIRD ST., SUITE 200 SAN FRANCISCO CA 94103 1 1 1 0 Chief Executive Officer Class A Common Stock 2021-12-13 4 C 0 189000 0.00 A 189000 D Class A Common Stock 2021-12-13 5 G 0 E 189000 0.00 D 0 D Class B Common Stock 2021-12-13 4 C 0 189000 0.00 D Class A Common Stock 189000 6252146 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, (b) the death or incapacity of the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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). /s/ Elizabeth Fisher, as Attorney-in-Fact for Spenser Skates 2021-12-15