Billionaire Sergey Brin is building political infrastructure that will last beyond his $102 million fight against Prop 40

Google co-founder Sergey Brin has transformed from a political bystander to a major player in California's electoral landscape following a proposed wealth tax. Brin, reportedly worth $231 billion, has contributed $102 million to Building a Better California, a political organization that has amassed hundreds of millions from other tech billionaires and business leaders.

The group has funneled money into ballot measures opposing the wealth tax, with $118.5 million specifically directed against Proposition 40 and $186 million supporting competing measures. If proposed, Proposition 40 would impose a 5% tax on assets over $1 billion for California residents. The ultrawealthy coalition has marshaled an unprecedented $612 million in state election contributions this cycle, with nearly half going to efforts to defeat Proposition 40.

Brin's opposition stems from potential financial exposure and his aversion to what he sees as a form of socialism. He relocated to Nevada to avoid the tax and has been vocal about his opposition. Despite some pushback, including from former Google CEO Eric Schmidt, the ultrawealthy alliance is determined to prevent the measure from becoming law.