Wellington Management Group LLP Acquires 10.7% Passive Stake in Amplitude, Inc. (AMPL)

Wellington Management Group LLP and its affiliated entities, including Wellington Group Holdings LLP, Wellington Investment Advisors Holdings LLP, and Wellington Management Company LLP, have filed a Schedule 13G disclosing a significant new position in Amplitude, Inc. (AMPL). As of March 31, 2026, the group reported beneficial ownership of 11,154,556 shares of Common Stock, representing 10.71% of the class. This filing indicates a substantial increase from a previous 0% holding, establishing Wellington as a major institutional shareholder. The shares are held in the ordinary course of business by various investment advisers under the Wellington umbrella on behalf of their clients. Wellington Management Group LLP serves as the parent holding company, with shared dispositive power over the full 11,154,556 shares and shared voting power over 6,578,413 shares. The filing was made under Rule 13d-1(b), certifying that the acquisition is passive and not intended to influence or change the control of the issuer.