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Warren Buffett is taking a big bite out of Apple.

The Oracle of Omaha’s Berkshire Hathaway (BRK.A/BRK.B) revealed in the quarterly 13f filing released today that it has dramatically expanded its stake in the tech titan by more than 300%. As of Dec. 31, the firm held more than more than 57.3 million shares of Apple (AAPL) worth more than $6.5 billion.

(Paul Morigi/Getty Images for Fortune/Time Inc)

Today, as Apple’s stock price hit a record high, crossing over $135 a share, that stake is worth more than $7.7 billion.

Perhaps Tiger Global Management, which dropped the iPhone maker , and Daniel Loeb's Third Point Capital, which lightened its position, were a bit too hasty.

Berkshire Hathaway made other changes. It exited Deere & Co. (DE) and cut its stake in Wal-Mart Stores (WMT) by almost 90% to 1,393,513 shares. The firm exited its position in Kinder Morgan (KMI). The firm remains bullish on airlines, dramatically expanding positions in both American Airlines (AAL) and Delta Air Lines (DAL).

Stuart Kaye, portfolio manager at Matarin Capital Management, says Buffett himself may have been the buyer. "The junior guys are buying the airlines, but given the size of the investment, Buffett himself was most likely the buyer of Apple," he told Barron's in an interview.