Oxfam | The analysis finds the 10 wealthiest Californians are now worth a collective $1.045 trillion, up $338.4 billion from March 2025. Oxfam released a new analysis showing how billionaire wealth in California has exploded over the last year, underscoring the need for tax reform to curb inequality in the state. California’s 246 billionaires saw their collective wealth increase by $487.2 billion — or 31% — between March 2025 and March 2026, reaching a new height of $2.061 trillion. The 10 richest California billionaires did exceptionally well, with their wealth surging by 48% in the last year.

Source: Oxfam.