Market Close: Big Winners & Losers for March 26, 2013 (LEDS, BVX, PTEK, OPXA, LOGM, ZIOP, STXS, GMAN, GMXR, PRTS)

SemiLEDS Corp. (NASDAQ: LEDS) is up 26.6% at $1.62.

Bovie Medical Corp. (NYSEMKT: BVX) is up 26.5% at $3.53.

PokerTek Inc (NASDAQ: PTEK) is up 24.6% at $1.52.

Opexa Therapeutics Inc.(NASDAQ: OPXA) is up 23.7% at $2.61.

LogMein Inc. (NASDAQ: LOGM) is up 19.6% at $21.26.

And here are today’s five biggest losing stocks at closing:

ZIOPHARMA Oncology Inc. (NASDAQ: ZIOP) is down 64.5% at $1.82.

Stereotaxis Inc. (NASDAQ: STXS) is down 17.6% at $1.97.

Gordmans Stores (NASDAQ: GMAN) is down 15.3% at $12.05.

GMX Resources Inc. (NYSE: GMXR) is down 14.9% at $2.51.

U.S. Auto Parts Network Inc. (NASDAQ: PRTS) is down 12.8% at $1.02.