After trailing the S&P 500 for three straight quarters, $2.6 billion JPMorgan Mid Cap Growth is outperforming this year. The mutual fund was up 4.58% this year going into Tuesday vs. 3.98% for its midcap peers tracked by Morningstar Inc. and 1.41% for the S&P 500, a proxy for the stock market. It carries an A Rating from IBD for 36-month performance. This stock fund has not changed its stripes.