Larry Page’s fortune swelled above $300 billion on Wednesday following a rise in Alphabet shares, after Warren Buffett took credit for Berkshire Hathaway’s multibillion-dollar investment in the Google parent, which has more than quadrupled over the last year.

Berkshire Hathaway disclosed its first investment in the Google parent last year.

Shares of Alphabet jumped 3.9% to around $373 as of Wednesday afternoon, extending a nearly 2% rise from Tuesday.

That boost in Alphabet’s stock price added $8 billion to Page’s net worth, valued at $301.7 billion, and $7.3 billion to fellow Google cofounder Sergey Brin’s net worth, estimated at $278.2 billion.

An uptick in Alphabet shares follows Buffett’s comments in a CNBC interview Tuesday morning, during which Buffett said he “initiated” Berkshire Hathaway’s first bet in Alphabet last year and admitted he “made a mistake” by not investing in the company earlier.