Suncor, an energy company based in Calgary, Canada, jumped as high as nearly 4 percent in after-hours trading on Thursday.
Buffett's conglomerate also revealed a new stake of 4.175 million shares in software company Red Hat, according to the company's 13-F filing. The filing documents the company's holdings as of end of December.
Berkshire added more than 20 million shares of General Motors in the fourth quarter to a total of 93.19 million shares. It also boosted its investments in many U.S. banks last quarter including Bank of America, U.S. Bankcorp, PNC, Bank of NY Mellon. The company reported adding 14.45 million shares of J.P. Morgan in the fourth quarter, to total 50.116 million shares.