Sergey Brin and 11 other billionaires and tech elite lined up against California's proposed billionaire tax

Google cofounder Sergey Brin and John Doerr have donated a combined $94 million to undercut California's proposed billionaire tax. Peter Thiel has donated $3 million to a separate group.

Getty Images

California's tech billionaires and millionaires are going down spending.This November, Californians will vote on whether to impose a billionaire tax after a last-minute push for Gov. Gavin Newsom to broker a deal failed to materialize.With their fortunes (or at least a lengthy court battle) potentially at stake, some of the biggest names in tech have poured in over $120 million to try to outright sink or complicate the chances of a one-time 5% wealth tax on state residents and trusts with assets over $1 billion.In comparison, SEIU-UHW, a healthcare workers union, the wealth tax's primary backer, has received roughly $31 million thus far.Here's a look at some of the biggest names that are lined up against the tax

Sergey Brin

Google cofounder Sergey Brin