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Filing: Sergey Brin donated another $20M to Building a Better California, which fights California's proposed wealth tax, taking his total contributions to $102M

Bloomberg Alicia Clanton

Context & Ripple Effects

Brin’s backing has escalated from a $45M contribution in March to $82M by July, when Building A Better California reserved $87M in television advertising against the proposed wealth tax. The new filing lifts his disclosed total to $102M.

The campaign is also part of a broader effort that mobilized other tech leaders around California state issues, making Brin’s latest contribution relevant beyond a single donor’s spending.

First-order effects

  • Building A Better California gains another $20M for its campaign against California’s proposed wealth tax, with Brin now accounting for $102M in disclosed contributions.
  • Supporters of the proposed tax face an opposition campaign whose television reservations were already set at $87M.

Second-order effects

  • The scale of Brin’s funding raises the incentive for other wealthy technology figures already organizing against the proposal to coordinate their own political spending.
  • Campaign messaging and media availability become more consequential as Building A Better California converts donor funding into a sustained paid-advertising operation.

Third-order effects

  • If this donor-led model persists, California tax debates may be increasingly shaped by durable political organizations financed by a small group of technology billionaires rather than by ad hoc ballot-campaign spending.

The trend: The proposed California wealth tax is becoming a focal point for organized, high-dollar political engagement by technology leaders.