JP Morgan CEO Jamie Dimon sold $234 million worth of JPMorgan Chase stock on Feb 20, according to U.S. Securities and Exchange Commission filings. The sale involved approximately 866,361 shares at around $269.83 per share through various family trusts and LLCs. Days later, Warren Buffett‘s Berkshire Hathaway announced a record $334 billion cash balance, suggesting potential caution about market valuations.