Jana Posts Lackluster Gains in Tough Year for Event-Driven Funds

       Barry Rosenstein, Jana Partners (Bloomberg) Barry Rosenstein’s Jana Partners, managed by his New York–based hedge fund firm of the same name, eked out a 0.3 percent gain in December, outpacing the S&P 500 stock index’s loss of 0.4 percent. But the gain didn’t do much to help the firm’s overall performance last