Google cofounders Larry Page and Sergey Brin just made about $8 billion in one day

Google shares are surging to record highs, up nearly 15% as of early Friday afternoon.

It's the largest one-day rally in the company's history.

This is great news for shareholders, especially Google's cofounders, Larry Page and Sergey Brin, who have each added about $4 billion to their already sizable fortunes today.

According to Bloomberg, Page and Brin's wealths are up about 20% in 2015, which is equivalent to about $7 billion each.

Page's net worth is now estimated by Forbes to be about $35.7 billion, while Brin is worth about $35 billion.

Google chairman Eric Schmidt, who owns 1.3% of the company, has made about $1.8 billion today as a result of the stock surge. Forbes estimates his net worth at $10.4 billion.

Google's stock has been soaring since it reported stellar earnings Thursday evening.

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