'Sage' of Omaha Buffett cuts Apple stake, boosting cash holding to record level - Buffett's Remaining $34 Billion Bank of America Stake Is Now Pure Profit - Warren Buffett now owns more T-bills than the Federal Reserve - Warren Buffett's Berkshire Hathaway made a number of changes in its equity portfolio last quarter - Buffett and Berkshire's Entertainment Value Is Waning - Berkshire Hathaway's cash pile hits record as Buffett cuts stake in Apple - Tracy Britt Cool, who worked for Warren Buffett for 10 years, is making her name in midsize firms