TREX CO INC|5Nov 26, 5:30 PM ET

Cox James Mitchell 5

5 · TREX CO INC · Filed Nov 26, 2012

Insider Transaction Report

Form 5

Period: 2012-12-31

TREX CO INCTREX

Cox James Mitchell

Vice President, Sales

Transactions

Tax Payment
Common Stock
2012-08-16$29.41/sh−18,810$553,202→ 145,334 total
Sale
Common Stock
2012-09-13$33.26/sh−6,419$213,496→ 28,915 total
Sale
Common Stock
2012-08-29$30.29/sh−7,553$228,780→ 67,781 total
Exercise/Conversion
Stock Appreciation Right
2012-08-16−6,825→ 0 total
Exercise: $25.37From: 2009-05-07Exp: 2017-02-21→ Common Stock (6,825 underlying)
Sale
Common Stock
2012-08-28$30.14/sh−4,044$121,886→ 78,519 total
Sale
Common Stock
2012-08-31$30.77/sh−20,000$615,400→ 35,334 total
Exercise/Conversion
Stock Appreciation Right
2012-08-16−37,049→ 0 total
Exercise: $9.14From: 2011-05-07Exp: 2018-05-07→ Common Stock (37,049 underlying)
Exercise/Conversion
Common Stock
2012-08-16$25.37/sh+3,413$86,588→ 139,285 total
Sale
Common Stock
2012-08-16$29.51/sh−16,909$498,985→ 128,425 total
Exercise/Conversion
Stock Appreciation Right
2012-08-16−3,515→ 7,029 total
Exercise: $26.20From: 2012-02-16Exp: 2022-02-16→ Common Stock (3,515 underlying)
Exercise/Conversion
Common Stock
2012-08-16$17.41/sh+9,948$173,195→ 207,801 total
Exercise/Conversion
Common Stock
2012-08-16$24.17/sh+9,700$234,449→ 129,047 total
Exercise/Conversion
Stock Appreciation Right
2012-08-16−9,700→ 0 total
Exercise: $24.17From: 2009-05-07Exp: 2016-02-08→ Common Stock (9,700 underlying)
Exercise/Conversion
Stock Appreciation Right
2012-08-16−21,519→ 0 total
Exercise: $13.44From: 2010-02-18Exp: 2019-02-18→ Common Stock (21,519 underlying)
Exercise/Conversion
Common Stock
2012-08-16$26.20/sh+3,515$92,093→ 211,316 total
Sale
Common Stock
2012-08-29$30.14/sh−3,185$95,996→ 75,334 total
Sale
Common Stock
2012-09-13$33.50/sh−359$12,027→ 18,556 total
Disposition to Issuer
Common Stock
2012-08-16$29.41/sh−47,172$1,387,329→ 164,144 total
Exercise/Conversion
Common Stock
2012-08-16$9.14/sh+37,049$338,628→ 176,334 total
Sale
Common Stock
2012-09-13$33.50/sh−18,556$621,626→ 0 total
Exercise/Conversion
Common Stock
2012-08-16$25.37/sh+6,825$173,150→ 135,872 total
Sale
Common Stock
2012-08-16$29.61/sh−10,000$296,100→ 118,425 total
Sale
Common Stock
2012-08-31$30.29/sh−12,447$377,020→ 55,334 total
Sale
Common Stock
2012-08-17$29.97/sh−35,862$1,074,784→ 82,563 total
Sale
Common Stock
2012-09-13$33.04/sh−10,000$330,400→ 18,915 total
Exercise/Conversion
Common Stock
2012-08-16$13.44/sh+21,519$289,215→ 197,853 total
Exercise/Conversion
Stock Appreciation Right
2012-08-16−9,948→ 4,972 total
Exercise: $17.41From: 2011-02-17Exp: 2020-02-17→ Common Stock (9,948 underlying)
Exercise/Conversion
Stock Appreciation Right
2012-08-16−3,413→ 0 total
Exercise: $25.37From: 2010-02-21Exp: 2017-02-21→ Common Stock (3,413 underlying)

Footnotes (3)

[F1]18,810 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover the payment of taxes currently due on the exercise of SARs.
[F2]This stock appreciation right is fully exercisable.
[F3]This stock appreciation right becomes exercisable in three equal annual installments beginning on the first anniversary of the grant date.

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