|Issuer:||TREX CO INC (TREX)|
|Original Submission Date:|
GUPP WILLIAM R.
C/O TREX COMPANY, INC.
160 EXETER DRIVE WINCHESTER, VA 22603-8605
|Title of Security||Transaction Date||2a. Deemed Execution Date||Transaction Code||Shares||Acquired or Disposed||Price per share||5. Amount of Securities Beneficially Owned Following Reported Transaction||6. Ownership Form Direct or Indirect||Nature of Indirect Ownership|
|Title of Derivative Security||Conversion or Exercise Price of Derivative Security||Transaction Date||Deemed Execution Date||Transaction Code||Number of Derivative Securities Acquired (A) or Disposed of (D)||Date Exercisable||Expiration Date||Title and Amount of Securities Underlying Derivative Security||Price of Derivative Security||Number of derivative Securities Beneficially Owned Following Reported Transaction(s)||Ownership Form: Direct (D) or Indirect (I)||Nature of Indirect Beneficial Ownership|
|STOCK APPRECIATION RIGHT||5.48||2021-02-23||deemed execution date||M||14,000 (d)||2014-02-12||2023-02-12||common stock 14,000||$5.48||14,000||direct|
|f1||stock appreciation rights (sars) are being exercised pursuant to a rule 10b5-1 trading plan adopted by the reporting person on august 5, 2020.|
|f2||5,935 shares are being surrendered as allowed by the company's 2014 stock incentive plan to cover payment of taxes currently due on previously granted restricted shares.|
|f3||the sales reported in this form 4 were effected pursuant to a rule 10b5-1 sales plan adopted by the reporting person on august 5, 2020.|
|f4||the price reported in column 4 is a weighted average price. these shares were sold in multiple transactions at prices ranging from $92.53 to $93.02, inclusive.|