• Amplitude CEO and President Spenser Skates reported spouse activity that sold 4,913 Class A shares on Sept. 30-Oct. 1.
• Sales priced at USD 14.453 weighted average on Sept. 30, USD 14.45 on Oct. 1; spouse holdings fell to zero.
• Spouse also acquired 4,913 Class A shares at USD 0 on the same dates.
• Skates directly held 5,342,146 Class B shares convertible 1-for-1 into Class A.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Amplitude Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001610717-26-000424), on October 02, 2026, and is solely responsible for the information contained therein.