It’s not been a good time for Warren Buffett wannabes. Sharp drops in many of the stocks owned by Buffett’s Berkshire Hathaway in recent weeks hit the sprawling conglomerate’s equity portfolio hard. The loss on seven of those holdings alone totals more than $5 billion provided Berkshire’s stakes have remained the same since June 30, the last date for which they were disclosed. In particular, Berkshire’s been stung by large holdings in IBM and long-time Buffett favorite Coca-Cola, both of which tumbled after disappointing third-quarter results.