| SC 13G | 2013-02-11 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | TREX CO INC | 1,276,375 | 7.5% | EDGAR |
| SC 13G/A | 2013-02-08 | BlackRock Inc. | TREX CO INC | 1,318,934 | 7.8% | EDGAR |
| SC 13G | 2013-02-01 | JPMORGAN CHASE & CO | TREX CO INC | 875,050 | 5.1% | EDGAR |
| SC 13G/A | 2012-12-10 | SECURITY INVESTORS LLC | TREX CO INC | 3,562 | 0.0% | EDGAR |
| SC 13G/A | 2012-11-13 | WELLINGTON MANAGEMENT CO LLP | TREX CO INC | 484,181 | 2.9% | EDGAR |
| SC 13G/A | 2012-02-14 | WELLINGTON MANAGEMENT CO LLP | TREX CO INC | 1,388,172 | 8.9% | EDGAR |
| SC 13G/A | 2012-02-10 | WELLINGTON MANAGEMENT CO LLP | TREX CO INC | 1,624,718 | 10.4% | EDGAR |
| SC 13G | 2012-02-10 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | TREX CO INC | 1,310,825 | 8.4% | EDGAR |
| SC 13G/A | 2012-02-01 | Knobloch Carl W Jr | TREX CO INC | 1,209,929 | 7.8% | EDGAR |
| SC 13G/A | 2012-01-31 | SECURITY INVESTORS LLC | TREX CO INC | 805,188 | 5.2% | EDGAR |
| SC 13G/A | 2012-01-23 | ROYCE & ASSOCIATES LLC | TREX CO INC | 883,240 | 5.7% | EDGAR |
| SC 13G/A | 2012-01-10 | BlackRock Inc. | TREX CO INC | 1,652,978 | 10.6% | EDGAR |
| SC 13G/A | 2011-11-10 | BLACKROCK ADVISORS LLC | TREX CO INC | 1,951,204 | 12.1% | EDGAR |
| SC 13G/A | 2011-11-10 | BlackRock Inc. | TREX CO INC | 1,951,204 | 12.1% | EDGAR |
| SC 13G/A | 2011-09-12 | WELLINGTON MANAGEMENT CO LLP | TREX CO INC | 1,571,047 | 10.1% | EDGAR |
| SC 13G/A | 2011-02-14 | SECURITY INVESTORS LLC | TREX CO INC | 907,707 | 5.9% | EDGAR |
| SC 13G/A | 2011-02-14 | WELLINGTON MANAGEMENT CO LLP | TREX CO INC | 1,458,548 | 9.4% | EDGAR |
| SC 13G/A | 2011-02-09 | BlackRock Inc. | TREX CO INC | 924,186 | 6.0% | EDGAR |
| SC 13G/A | 2011-01-26 | ROYCE & ASSOCIATES LLC | TREX CO INC | 823,140 | 5.3% | EDGAR |
| SC 13G/A | 2011-01-14 | J P MORGAN CHASE & CO | TREX CO INC | 662,220 | 4.2% | EDGAR |