Both are substantial investments in Berkshire's portfolio. The Bank of America investment is one of the largest, with a $34 billion market value representing a 9.99% stake in the megabank. Ally is a smaller bank, but Berkshire owns 9.5% of it, an investment worth just over $1 billion.

Six blue-chip stocks aggressively backed by Warren Buffett are on sale on Wall Street as the year draws to a close, mainly due to broad economic factors and stock market fashion. That makes them worth a look,

Warren Buffett's holding company trimmed its stake in Bank of America, but it's still the third largest holding in Berkshire Hathaway's equity portfolio.

Geico, and pension plans of other Berkshire Hathaway units bought nearly $30 million of shares of domain-name registry firm VeriSign.