Buffett's firm reveals new stakes in Paramount, Citigroup

Warren Buffett’s company has revealed all the investment moves it made in the first quarter, when it spent more than $51 billion on stocks

OMAHA, Neb. -- Warren Buffett's company on Monday revealed all the investment moves it made in the first quarter, when it spent more than $51 billion on stocks.

But Buffett had already shared the biggest investments with Berkshire Hathaway shareholders at the company's recent annual meeting. That means investors already knew that he had invested heavily in Chevron, Occidental Petroleum and HP Inc. during the quarter, while picking up nearly 4 million more Apple shares and betting that Microsoft's acquisition of Activision Blizzard will go through.

But Monday's Securities and Exchange Commission filing also revealed new stakes in Citigroup, Ally Financial, media company Paramount Global, insurer Markel, chemical maker Celanese Corp., and pharmaceutical distributor McKesson Corp.

Berkshire also added 2 million General Motors shares to give it 62 million shares of the automaker during a quarter when its cash pile shrank to $106 billion from $147 billion because of all of its stock purchases.