Barrett Business Services, Trex Co and American Commercial Lines lead small-cap percentage gainers

Barrett Business Services Inc (Nasdaq:BBSI), Trex Co In (Nasdaq:TWP) and American Commercial Lines Inc (Nasdaq:ACLI) are among the biggest percentage gainers in Wednesday's trading among companies with market capitalizations under $1 billion.
Also included among the results: Image Sensing Systems Inc (Nasdaq:ISNS), SAVVIS Inc (Nasdaq:SVVS), Starent Networks Corp (Nasdaq:STAR), Wright Express Corp (Nasdaq:WXS), Hutchinson Technology Inc (Nasdaq:HTCH) and Eagle Test Systems Inc (Nasdaq:EGLT).
Here are the biggest percentage gainers among small caps:
| Price at 12:00 ET | Change | % Change | Volume | Year High | Year Low | ||
| BBSI | BARRETT BUSINESS SERVICES IN | 15.62 | +4.06 | +35.1% | 261.0k | 26.73 | 10.38 |
| TWP | TREX INC | 14.30 | +2.80 | +24.3% | 486.2k | 19.21 | 5.34 |
| ACLI | AMERICAN COMMERCIAL LINES | 11.70 | +2.13 | +22.3% | 2,604.1k | 26.56 | 8.31 |
| ISNS | IMAGE SENSING SYS INC | 15.00 | +2.40 | +19.0% | 26.7k | 18.54 | 11.37 |
| SVVS | SAVVIS INC | 16.20 | +2.56 | +18.8% | 1,069.0k | 44.68 | 10.13 |
| STAR | STARENT NETWORKS CORP | 13.67 | +2.11 | +18.3% | 2,215.1k | 31.67 | 10.00 |
| WXS | WRIGHT EXPRESS CORP | 28.00 | +4.00 | +16.7% | 709.8k | 41.12 | 22.14 |
| HTCH | HUTCHINSON TECHNOLOGY INC | 15.18 | +2.00 | +15.2% | 529.4k | 27.85 | 11.38 |
| EGLT | EAGLE TEST SYS INC | 12.53 | +1.58 | +14.4% | 129.8k | 16.60 | 9.31 |
| HGR | HANGER ORTHOPEDIC GROUP INC | 17.34 | +2.06 | +13.5% | 337.1k | 16.93 | 8.61 |









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