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Billionaire Tom Siebel Donates to Newsom's Political Opponents

4/18/2026

25 5 Full Breakdown

Summary

Story summary

Tom Siebel, a billionaire and cousin of Jennifer Siebel Newsom, has donated to Newsom's critics, giving $50,000 to Matt Mahan's gubernatorial campaign and $10,000 to Steve Hilton, who called Newsom a "disaster."
He has previously opposed Newsom's policies, including a $1 million contribution against Prop. 50.
His political donations have sparked tension within his family, as he also supported U.S. President Donald Trump in 2024.

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Story summary

Tom Siebel, a billionaire and cousin of Jennifer Siebel Newsom, has donated to Newsom's critics, giving $50,000 to Matt Mahan's gubernatorial campaign and $10,000 to Steve Hilton, who called Newsom a "disaster."
He has previously opposed Newsom's policies, including a $1 million contribution against Prop. 50.
His political donations have sparked tension within his family, as he also supported U.S. President Donald Trump in 2024.