Buffett's Berkshire trims some stock stakes
The moves are all relatively small, however, especially by Berkshire standards.
The Dish shares were worth about $31 million at the current price, and the Glaxo stake totaled only $19.3 million, indicating that they were handled by one of Berkshire's portfolio managers rather than by Buffett himself.
Another move appears to be the work of a portfolio manager. Berkshire added 2,948,285 shares of Liberty Global, John Malone's London-based international cable company. That stake was worth about $245 million as of Friday's close.
(Read more: Berkshire Hathaway's 15 biggest stock holdings)
Last October, Berkshire coverted Goldman warrants into more than $2 billion of common stock. The warrants were part of a 2008 loan deal.
The DaVita share purchases were most recently disclosed in early December.
Berkshire cut its holdings of ConocoPhillips by 18.1 percent during the fourth quarter, moving to 11.08 million shares from 13.53 million shares, a reduction of $160 million at the current price.
It cut its stake in Suncor Energy by 27.8 percent, to 13 million shares from 18 million—a $167 million reduction.
—By CNBC's Alex Crippen. Follow him on Twitter: