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 went a buying spree in late December, purchasing VeriSign stock in multiple sessions through Dec. 24.

Key Takeaways At the end of the third quarter, Berkshire Hathaway's cash pile swelled to a record $325.2 billion.Warren Buffett scaled back Berkshire's stake in its largest holding, Apple, and trimmed its position in Bank of America and other long-held investments.