NEW YORK (TheStreet) -- Warren Buffett's biggest maneuver in the first quarter of the year was, without a doubt, investing $10 billion alongside 3G Capital to orchestrate the merger of H.J. Heinz Co. and Kraft Foods Group (KRFT).
Another of major move for Buffett? Increasing by nearly 50% his stake in Precision Castparts (PCP), a manufacturer of metal components and products that you probably never heard of. The stock has declined 9% thus far for the year. It's rare that the Oracle of Omaha leaves market observers scratching their heads.
Buffett is not the only billionaire investor to have made a move that some might find surprising in the first quarter of 2015.
The latest round of 13F filings, required of all money managers overseeing more than $100 million in equities traded on U.S. exchanges, revealed some rather intriguing buys and sells.
While some big-name investors cashed in on major long positions, others poured money into areas that might seem a bit out of character. Here's a look at some of the most interesting billionaire maneuvers of the first quarter:
David Tepper Cashes In on American Airlines
He first disclosed his American Airlines shares in the holdings report corresponding to 2013's fourth quarter. The stock became his top public equity pick in the second quarter of 2014, when he reported 11.7 million shares valued at more than $500 million. By the end of last year's fourth quarter, though, the billionaire had scaled back, reducing his position to 4.3 million shares valued at $233.6 million.
The Appaloosa Management founder's latest disclosure revealed that in the first quarter of the year, he cashed out entirely.
American Airlines proved a stellar investment for Tepper, as the stock climbed 115% in 2014. At a recent investor conference, American Airlines CFO Derek Kerr indicated that management is just getting started with the changes it plans to make in its operations. David Tepper appears to have gotten enough out of the company already -- at least for now.