SemGroup Energy Partners, UAL and Gmarket lead small-cap volume in pre-market

SemGroup Energy Partners LP (Nasdaq:SGLP), UAL Corp (Nasdaq:UAUA) and Gmarket Inc (Nasdaq:GMKT) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.
Also included among the results: Medivation Inc (Nasdaq:MDVN), Crocs Inc (Nasdaq:CROX), ValueClick Inc (Nasdaq:VCLK), Overstock.com Inc (Nasdaq:OSTK), Canadian Solar Inc (Nasdaq:CSIQ) and ViroPharma Inc (Nasdaq:VPHM).
Here are the most actively traded companies among small caps:
| Price at 9:26 ET | Change | % Change | Volume | Year High | Year Low | ||
| SGLP | SEMGROUP ENERGY PARTNERS L P | 7.70 | -3.30 | -30.0% | 311.4k | 31.00 | 10.16 |
| UAUA | UAL CORP | 5.50 | +0.43 | +8.5% | 263.7k | 51.60 | 2.80 |
| GMKT | GMARKET INC | 22.00 | +0.00 | +0.0% | 118.0k | 29.20 | 15.76 |
| MDVN | MEDIVATION INC | 19.75 | +1.14 | +6.1% | 81.4k | 25.06 | 11.53 |
| CROX | CROCS INC | 9.11 | +0.17 | +1.9% | 38.4k | 75.21 | 6.75 |
| VCLK | VALUECLICK INC | 11.02 | +0.01 | +0.1% | 14.4k | 30.60 | 10.20 |
| OSTK | OVERSTOCK COM INC DEL | 26.70 | -1.00 | -3.6% | 12.6k | 39.39 | 8.61 |
| CSIQ | CANADIAN SOLAR INC | 31.50 | +0.13 | +0.4% | 11.5k | 51.80 | 6.50 |
| VPHM | VIROPHARMA INC | 9.56 | -0.70 | -6.8% | 10.4k | 14.85 | 7.11 |
| SOLF | SOLARFUN POWER HOLDINGS CO L | 14.81 | -0.03 | -0.2% | 8.9k | 40.19 | 8.68 |









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