Diversification ranks among the most important components of many investment strategies. However, one of the world's greatest investors isn't gung ho about the idea. Warren Buffett once said, "Diversification is protection against ignorance.

Through the first nine months of 2024, Warren Buffett's Berkshire Hathaway unloaded $133 billion worth of stocks. Buffett reduced Berkshire's massive stake in Apple and sold nearly a quarter of its Bank of America holding.

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,