Warren Buffett amasses more cash and sells more stock, but doesn't explain why in annual letter - CNBC

1. Warren Buffett amasses more cash and sells more stock, but doesn't explain why in annual letter  CNBC
2. Warren Buffett celebrates Berkshire Hathaway's success over 60 years as CEO while admitting mistakes  The Associated Press
3. Buffett Says 'Substantial Majority' of Berkshire Shareholders' Money in Stocks  Investopedia
4. Warren Buffett says US should "spend wisely", plans to increase investment in Japan  Yahoo Finance
5. Warren Buffett Defends His Growing Cash Pile  The Wall Street Journal