Since Michael Kotlarz took the reins of $5.6 billion Oppenheimer Capital Appreciation Fund on July 1, 2013, the fund’s relative performance has jumped. In the 10 years before Kotlarz took the reins, the fund’s average annual gain was 5.00%, held to humble returns by the 2007-09 bear market. And the performance lagged 95% of its large-cap growth peers tracked by Morningstar Inc.