Exhibit 99.1 Amplitude Announces First Quarter 2024 Financial Results • Annual recurring revenue was $285 million, up 9$72.6 million, up 9% year over year • First quarter Cash Flow from Operations of $(0.05) million and Free Cash Flow of$(1.1) million, representing a 7 percentage point increase in Free Cash Flow margin year over year SAN FRANCISCO – May 9, 2024 – Amplitude, Inc. (Nasdaq: AMPL), a leading digital analytics platform, today announced financial resul ...