Warren Buffett showed that the selloff in Wells Fargo & Co.’s stock this year has just made him love the banking giant even more, as he boosted his stake in the company to 504.3 million shares, according to regulatory filings.

Buffett’s investment vehicle Berkshire Hathaway Inc. BRK.B, +0.07% now owns 10% of Wells Fargo’s common stock outstanding, making him by far the largest shareholder. That is up from 479.7 million shares, or a 9.45% stake, as of Dec. 31, filings show.