A proposed ballot initiative in California, dubbed the Billionaire Tax Act, seeks to impose a one-time 5% tax on the net worth of the state's estimated 200 billionaires. This tax, crafted by the SEIU United Healthcare Workers West union, aims to replace healthcare funding cuts initiated by the Trump administration. The measure has gained significant traction, collecting nearly double the required signatures to qualify for the November ballot, indicating its popularity among voters.

Silicon Valley's elite, including prominent figures like Google cofounder Sergey Brin, venture capitalist Marc Andreessen, and PayPal cofounder Max Levchin, have mounted a concerted, and often secretive, effort to defeat the tax. They have organized on platforms like Signal, brainstorming strategies ranging from appealing to the governor to running counter-initiatives and backing political candidates. These billionaires have collectively injected significant funds, with a group pouring $35 million into a political action committee called Building a Better California, which qualified two counter-initiatives for the ballot.

The initial attempts by these tech titans to thwart the tax have faced setbacks. Their preferred candidate for governor, Mahan, lost decisively in the June 2 primary, securing only 3.7% of the state vote. Similarly, another candidate they backed to defeat a representative, Agarwal, failed to advance from the primary with just 6.5% of the vote. Despite these efforts, Governor Gavin Newsom is aggressively attempting to negotiate the tax off the ballot before the June 25 ratification deadline, suggesting that the primary opposition might now come from political negotiations rather than direct billionaire-funded campaigns.