Form 4 Filing for Amplitude, Inc.

On October 2, 2026, Spenser Skates, CEO and President of Amplitude, Inc., reported a series of transactions. Skates acquired 70,087 shares of Class A Common Stock through a conversion of Class B Common Stock, with a reported price of $0.00. Concurrently, the same number of Class A shares were disposed of at a weighted average price of $14.5203, as part of a 10b5-1 trading plan established by Skates' spouse. The Class B Common Stock is convertible into Class A Common Stock under specific conditions, including transfer, death, or cessation of employment/directorship of Mr. Skates or any founder. This filing indicates a net change of zero shares of Class A Common Stock held directly or indirectly by Skates following these transactions, with 0 shares of Class A Common Stock and 307,157 shares of Class B Common Stock remaining in holdings related to the spouse after the transactions.