* Investors focus on Nvidia's ( NVDA ) guidance for chip supply and demand * Nvidia's ( NVDA ) market cap swing could reach $260 billion post-results in either direction * Nvidia's ( NVDA ) correlation with S&P 500 fell to 30% from 71% last year * By Carolina Mandl NEW YORK, Feb 21 (Reuters) - Nvidia's ( NVDA )...

U.S. stocks settled lower on Friday, with the Dow Jones index dipping more than 700 points during the session. The S&P 500 also fell 1.71% to 6,013.13, while the Nasdaq Composite declined 2.20% at 19,524.01 during Friday's session. Wall Street analysts make new stock picks on a daily basis. Unfortunately for investors, not all analysts have particularly impressive track records...

NEW YORK (Reuters) - Berkshire Hathaway ( BRK/A ) on Saturday reported record annual profits and boosting its cash stake to $334.2 billion, as Warren Buffett used his annual shareholder letter to caution Washington to spend money wisely and take care of those who get the short straws in life. Buffett's admonition came as many investors worry U.S. lawmakers won't...

* Buffett says Uncle Sam should take care of less fortunate * Berkshire operating profit sets record * Annual meeting shortened By Jonathan Stempel NEW YORK, Feb 22 (Reuters) - Berkshire Hathaway ( BRK/A ) on Saturday reported record annual profits even while boosting its cash stake to $334.2 billion, as Warren Buffett used his annual shareholder letter to caution...