The filing showed Berkshire added to its investments in American, Delta and Southwest airlines in the quarter.
The Monday filing with the Securities and Exchange Commission confirmed that Berkshire more than doubled its Apple holdings in the first quarter to 129 million Apple shares, worth $18.6 billion, as of March 31.
In moves most likely not made by Buffett, Berkshire's stake in Twenty-First Century Fox was eliminated and stakes in the Bank of NY and Sirius XM were raised. Its United Continental Holdings Inc. stake was unchanged, and its Delta Air Lines Inc. stake was reduced to 55 million from 60 million shares.
Berkshire sold off almost 9 million shares in Twenty-First Century Fox.
Berkshire's sale of its $251m Fox stake came several months after the parent of Fox News became embroiled in a sexual harassment scandal.
It's likely, however, that Buffett would have disagreed with Fox's efforts to reportedly sweep the allegations under the rug, silencing women who leveled accusations against O'Reilly as well as former Fox chairman Roger Ailes with settlement payments that ran in the millions of dollars.
It is unclear why Berkshire sold Fox or who made the investment, which began in 2014. Berkshire Hathaway did not return a request for comment on whether the harassment claims played a part in his motivations for dumping the shares.
Berkshire holds major stakes in Coca-Cola, Wells Fargo, American Express and other companies.
Buffett recently announced that Berkshire Hathaway had sold about a third of its IBM stock.
The Omaha, Nebraska-based conglomerate also owns some 90 businesses including the BNSF railroad, Geico vehicle insurance and Dairy Queen ice cream.
The company now owns 49 million shares of American Airlines, worth $2.3 billion and equal to about 9.6% of the airline.