A Wealth Tax Floated in California Has Billionaires Thinking of Leaving

Billionaires including Peter Thiel, the tech venture capitalist, and Larry Page, a co-founder of Google, are considering cutting or reducing their ties to California by the end of the year because of a proposed ballot measure that could tax the state's wealthiest residents, according to five people familiar with their thinking.

Mr. Thiel, 58, who owns a home in the Hollywood Hills and operates a personal investment firm from Los Angeles, has explored opening an office for that firm, Thiel Capital, in another state and spending more time outside California, three of the people said...