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WASHINGTON (Reuters) - Berkshire Hathaway Inc <BRKa.N>, billionaire Warren Buffett's investment company, no longer held any Ameriprise Financial Inc <AMP.N> stock as of March 31, according to a U.S. regulatory filing on Thursday.

Berkshire previously owned 661,742 Ameriprise shares, according to a filing with the U.S. Securities and Exchange Commission.

Berkshire increased stakes in the following at the end of the first quarter: Burlington Northern Santa Fe Corp <BNI.N>; Ingersoll-Rand Co Ltd <IR.N>; Kraft Foods Inc <KFT.N>; U.S. Bancorp <USB.N>; Wells Fargo & Co <WFC.N> and WellPoint Inc <WLP.N>.

It lowered its holdings slightly in Iron Mountain Inc <IRM.N>, according to a quarterly report.

(Reporting by John Poirier; editing by Jeffrey Benkoe)