Thomas M. Siebel Reports 1.3% Decrease in C3.ai, Inc. Beneficial Ownership to 15.3% Stake

On May 15, 2026, Thomas M. Siebel and associated entities filed Amendment No. 6 to their Schedule 13G regarding C3.ai, Inc. (AI). The filing reports a decrease in beneficial ownership for Mr. Siebel, whose position fell by approximately 1.3% compared to the previous reporting period. As of March 31, 2026, Mr. Siebel beneficially owns 25,556,651 shares of Class A Common Stock, representing a 15.3% stake in the company. This total includes 22,483,831 shares of Class A Common Stock and 3,072,820 shares of Class B Common Stock (convertible 1-for-1 into Class A). The holdings are distributed across various entities including the Siebel Living Trust (1.9%), Siebel Asset Management (0.1%), First Virtual Holdings (0.4%), and the Siebel 2011 Irrevocable Children's Trust (0.9%). Mr. Siebel's beneficial ownership also accounts for 20,237,982 shares underlying stock options and 53,125 shares from restricted stock units vesting within 60 days. The filers maintain sole voting and dispositive power over their respective shares.