Sharat Sharan's Stock Option Exercise and Sales at ON24 Inc.

Sharat Sharan, a director, officer, and 10% stockholder of ON24 Inc., exercised stock options on October 16, 2025, acquiring 32,093 common shares. The shares were acquired from the issuer for cash, and the aggregate market value of the securities sold on the same date was $179,720.80. Additionally, Sharan sold a significant number of shares in the past three months, including 20,873 shares on October 1, 2025, for $116,986.90, 29,457 shares on September 30, 2025, for $169,012.48, 32,159 shares on September 16, 2025, for $178,501.75, and 37,982 shares on August 11, 2025, for $185,090.08. These transactions were executed under a Rule 10b5-1 trading plan adopted on May 14, 2025.