Technology industry leaders have contributed hundreds of millions of dollars to candidates and ballot measures ahead of California's June 2 primary election, marking what appears to be the most expensive primary season in the state's history.

Google co-founder Sergey Brin has emerged as the largest individual donor, spending $66 million since January to oppose a proposed billionaire tax that will appear on the November ballot. The measure would impose additional taxes on California's wealthiest residents.

The tech industry's political spending has extended across multiple levels of government. Democratic gubernatorial candidate Matt Mahan has received the most donations of any candidate, with contributions from executives at major technology companies including Google, Amazon, Snap, LinkedIn, Reddit and Palantir. Cryptocurrency executive Chris Larsen has funded three Super PACs with $26 million to influence various campaigns statewide, including $1 million to support a candidate for state insurance commissioner.

Google and Meta have jointly funded a Super PAC with $10 million to back assembly and senate candidates in local district races across California. Tech-backed political action committees have also produced voter guides for city-level primaries, making recommendations on local tax measures.

Political analysts suggest the unprecedented spending reflects the technology industry's effort to maintain influence in California, where many major tech companies are headquartered. The investments span from local municipal races to statewide ballot measures, indicating a comprehensive strategy to shape political outcomes across multiple levels of government.