1. Sergey Brin – $45,000,000. Google co-founder and Alphabet board member, Brin, is known for helping build one of the top 3 most valuable companies in the world.
2. Uber Technologies, Inc. – $32,512,759. Uber is a San Francisco-based publicly traded transportation and delivery platform company best known for ride-hailing, food delivery, and logistics services. Dara Khosrowshahi is CEO.
3. SEIU-UHW – $15,915,666. SEIU-UHW is a California healthcare workers union representing more than 120,000 workers and advocating on labor and healthcare policy issues.
4. California Teachers Association – $15,000,000. The CTA is the state’s largest teachers union.
5. AFSCME Local 3299 – $13,100,000. AFSCME Local 3299 is the University of California system’s largest employee union.
6. Chris Larsen and Ripple Labs – $12,000,000. Larsen is the co-founder and executive chairman of Ripple Labs, a San Francisco-based fintech company that uses blockchain technology and the XRP digital asset.
7. California Hospitals Committee – $10,000,000. The California Hospitals Committee on Issues is a political committee sponsored by the California Association of Hospitals and Health Systems that advances hospital-industry positions in state ballot campaigns.
8. OpenAI – $10,000,000. OpenAI is a San Francisco-based artificial intelligence research and deployment company whose stated mission is to ensure AGI benefits all of humanity. Sam Altman is CEO.
9. John Doerr III – $9,500,000. Doerr is a longtime Kleiner Perkins venture capitalist known for early investments in major tech companies, including Google and Amazon.
10. Patrick Collison – $7,000,000. Collison is the co-founder and CEO of Stripe, the fintech company best known for online payments infrastructure.
11. Michael Moritz – $7,000,000. Moritz is a veteran venture capitalist best known for his long career at Sequoia Capital and early investments in companies such as Google and PayPal.
12. Gary K. Michelson – $6,000,000. Michelson is an orthopedic spinal surgeon, prolific medical inventor, and philanthropist known for hundreds of patents in spinal surgery technology.
13. Meyer Luskin – $5,000,000. Luskin is a Los Angeles businessman, philanthropist, and CEO of Scope Industries, known especially for his contributions to UCLA.
14. Altamed Health Services Corporation – $4,717,867. AltaMed is a large Southern California nonprofit community health system.
15. Richard Uihlein – $4,000,000. Uihlein is the CEO and co-founder of Uline, a Wisconsin shipping and industrial supplies company, and a prominent conservative political donor.

Source: California Fair Political Practices Commission, data is current as of April 11, 2026.