According to the Latest From the “Billionaires’ Wealth Windfall Update” 

The Billionaires’ Wealth Windfall Update is a periodic report on the outrageous growth in wealth of U.S. billionaires during the coronavirus pandemic. Data is based on daily real-time changes reported by Forbes. 

Mark Zuckerberg: 

• Wealth as of Sep. 3: $111 billion, up $1.8 billion from yesterday. 
• Wealth has increased $56.3 billion since March 18, 2020, at the beginning of the pandemic – up from $54.7 billion, a 102.9% increase. 
• Wealth has increased $48.7 billion since Feb. 8, 2019 based on Forbes 2019 World’s Billionaires List – up from $62.3 billion, or 78.1%.
• He is the 3rd richest American.

Larry Page: 

• Wealth as of Sep. 3: $76 billion, up $1.8 billion from yesterday. 
• Wealth has increased $25.1 billion since March 18, 2020, at the beginning of the pandemic – up from $50.9 billion, a 49.4% increase. 
• Wealth has increased $25.2 billion since Feb. 8, 2019 based on Forbes 2019 World’s Billionaires List – up from $50.8 billion, or 49.7%.
• He is the 8th richest American.

Sergey Brin: 

• Wealth as of Sep. 3: $73.9 billion, up $1.7 billion from yesterday. 
• Wealth has increased $24.8 billion since March 18, 2020, at the beginning of the pandemic – up from $49.1 billion, a 50.5% increase. 
• Wealth has increased $24.1 billion since Feb. 8, 2019 based on Forbes 2019 World’s Billionaires List – up from $49.8 billion, or 48.4%.
• He is the 9th richest American.

Americans for Tax Fairness and the Institute for Policy Studies – Program on Inequality maintain more information on billionaire wealth growth at this website.