In Support of this measure: 

 

Total amount of reported contributions to this measure: $31,411,525* 

Individual Ballot Measure Committees Formed for this Measure

Committee ID**

Committee Name

Total Reported Contributions

1484470

Yes on 40 - Billionaire Tax Now, sponsored by Service Employees International Union - United Healthcare Workers West

$31,411,525

*Through 08/02/2026. 

**The law also requires ballot measure committees that raise $1 million or more to report the Top 10 Contributors who have donated at least $10,000 to the committee.

 

In Opposition to this measure: 

 

Total amount of reported contributions to this measure: $11,270,000* 

Individual Ballot Measure Committees Formed for this Measure

Committee ID**

Committee Name

Total Reported Contributions

1485228

Californians Against Tax Increases, sponsored by the California Business Roundtable - No on 40

$220,000

1486695

Golden State Promise - No on Prop 40

$10,450,000

1492108

No on Prop 40 - Doctors, Teachers, Small Businesses, Working Families and Public Safety Against the Reckless Wealth Tax Experiment

$200,000

1485007

Stop the Squeeze

$400,000

*Through 08/02/2026. 

**The law also requires ballot measure committees that raise $1 million or more to report the Top 10 Contributors who have donated at least $10,000 to the committee.