Warren Buffett's Berkshire Hathaway Inc. has disclosed new investments in DaVita Inc. and Liberty Media.

Berkshire held 2.68 million shares of DaVita, one of the largest U.S. providers of dialysis services, as of Dec. 31, according to a regulatory filing released Tuesday. The estimated market value is $203.5 million.

The 1.7 million shares of Liberty Media, a media conglomerate controlled by John Malone, were valued at $132 million at the end of the year.

Berkshire also showed a stake of 63.9 million shares of International Business Machines Corp. (IBM), up from 57.3 million at the end of the third quarter.

In addition, the filing with the U.S. Securities and Exchange Commission shows that Berkshire has raised its stake in Intel Corp. to 11.49 million shares and in DIRECTV to 20.35 million shares. The company has also raised its holding in Wells Fargo & Co.

Berkshire Hathaway has lowered its stake in Kraft Foods to 87 million shares and in Johnson & Johnson to 29 million shares. Berkshire’s equity portfolio at the end of the quarter was worth $66.15 billion, up from $59.05 billion during the three-month period ending in September.