Warren Buffett's Berkshire Hathaway shares surged in premarket trading, nearing a $1 trillion market value after posting record profits. The conglomerate's class B shares gained 5% before the bell on Monday following its second consecutive annual profit record. Berkshire's operating earnings jumped 28% in the fourth quarter, with a cash pile reaching a record high of $168 billion. The stock hit a new high of $647,039.00, and Buffett's conglomerate is now worth almost $1 trillion after a post-earnings surge.