TREX

SEC source: 0001069878-26-000083 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,627

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000081 · form4.xml · nonDerivative · entry 1

Keffer David Christian · CIK 0002034139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,533

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000079 · form4.xml · nonDerivative · entry 1

Taylor Brian J. · CIK 0002152353 · SVP, Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,520

F1 · kind: This restricted stock unit award vests over a three-year period in three equal annual installments occurring August 24, 2027, August 24, 2028, and August 24, 2029.

SEC source: 0001069878-26-000075 · form4.xml · nonDerivative · entry 1

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,794

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $49.97 to $50.11, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.

SEC source: 0001069878-26-000073 · form4.xml · nonDerivative · entry 1

Volas Gerald · CIK 0001597860 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,405

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000070 · form4.xml · nonDerivative · entry 1

Tasi Irene · CIK 0002113737 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,357

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000068 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,038

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000066 · form4.xml · nonDerivative · entry 1

ROBINSON PATRICIA B · CIK 0001185204 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,162

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000063 · form4.xml · nonDerivative · entry 1

Lovett Gena C · CIK 0001785725 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,903

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000061 · form4.xml · nonDerivative · entry 1

Keffer David Christian · CIK 0002034139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,386

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000059 · form4.xml · nonDerivative · entry 1

JUSTER KRISTINE L · CIK 0001673396 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,729

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000054 · form4.xml · nonDerivative · entry 1

GRATZ JAY M · CIK 0001180356 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,705

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000050 · form4.xml · nonDerivative · entry 1

Cline James E · CIK 0001430183 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,807

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000046 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,409

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000044 · form4.xml · nonDerivative · entry 1

Keffer David Christian · CIK 0002034139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,555

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000042 · form4.xml · nonDerivative · entry 1

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,631

F1 · kind: The reported transaction was effected pursuant to a plan adopted by the reporting person on March 5, 2026, in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934 (the "10b5-1 Plan"). The 10b5-1 Plan provides for automatic sales of shares according to pre-established instructions. The reporting person sold 1,400 shares in a single trade at a price of $50.00 per share. All 1,400 shares under the 10b5-1 Plan have been sold.

SEC source: 0001069878-26-000036 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,883

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000038 · form4.xml · nonDerivative · entry 1

Keffer David Christian · CIK 0002034139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,424

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000024 · form4.xml · nonDerivative · entry 3

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,183

F3 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.54 to $40.86, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (3) to this Form 4.

SEC source: 0001069878-26-000024 · form4.xml · nonDerivative · entry 2

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,161

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.84 to $40.34, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (2) to this Form 4.

SEC source: 0001069878-26-000024 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,175

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.13 to $40.33, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4.

SEC source: 0001069878-26-000034 · form4.xml · nonDerivative · entry 3

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 68,844

F3 · kind: 4.496 shares are being surrendered as allowed by the Company's 2023 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted stock units.

SEC source: 0001069878-26-000034 · form4.xml · nonDerivative · entry 2

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,340

F2 · kind: Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

SEC source: 0001069878-26-000034 · form4.xml · nonDerivative · entry 1

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,423

F1 · kind: Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

SEC source: 0001069878-26-000032 · form4.xml · nonDerivative · entry 3

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,031

F3 · kind: 2,850 shares are being surrendered as allowed by the Company's 2023 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted stock units.

SEC source: 0001069878-26-000032 · form4.xml · nonDerivative · entry 2

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,881

F2 · kind: Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

SEC source: 0001069878-26-000032 · form4.xml · nonDerivative · entry 1

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,544

F1 · kind: Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

SEC source: 0001069878-26-000030 · form4.xml · nonDerivative · entry 3

FAIRBANKS BRYAN HORIX · CIK 0001650692 · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,044

F3 · kind: 23,127 shares are being surrendered as allowed by the Company's 2023 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted stock units.

SEC source: 0001069878-26-000030 · form4.xml · nonDerivative · entry 2

FAIRBANKS BRYAN HORIX · CIK 0001650692 · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 190,171

F2 · kind: Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

SEC source: 0001069878-26-000030 · form4.xml · nonDerivative · entry 1

FAIRBANKS BRYAN HORIX · CIK 0001650692 · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 195,849

F1 · kind: Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

SEC source: 0001069878-26-000026 · form4.xml · nonDerivative · entry 3

Zambanini Adam Dante · CIK 0001512909 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234,514

F3 · kind: 8,271 shares are being surrendered as allowed by the Company's 2023 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted stock units.

SEC source: 0001069878-26-000026 · form4.xml · nonDerivative · entry 2

Zambanini Adam Dante · CIK 0001512909 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 242,785

F2 · kind: Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

SEC source: 0001069878-26-000026 · form4.xml · nonDerivative · entry 1

Zambanini Adam Dante · CIK 0001512909 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 244,713

F1 · kind: Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

SEC source: 0001069878-26-000022 · form4.xml · nonDerivative · entry 2

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,294

F2 · kind: This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028, and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

SEC source: 0001069878-26-000022 · form4.xml · nonDerivative · entry 1

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,973

F1 · kind: This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028, and March 1, 2029.

SEC source: 0001069878-26-000020 · form4.xml · nonDerivative · entry 2

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,513

F2 · kind: This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028, and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

SEC source: 0001069878-26-000020 · form4.xml · nonDerivative · entry 1

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,332

F1 · kind: This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028, and March 1, 2029.

SEC source: 0001069878-26-000016 · form4.xml · nonDerivative · entry 2

Zambanini Adam Dante · CIK 0001512909 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 241,090

F2 · kind: This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

SEC source: 0001069878-26-000016 · form4.xml · nonDerivative · entry 1

Zambanini Adam Dante · CIK 0001512909 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 222,176

F1 · kind: This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028 and March 1, 2029.

SEC source: 0001069878-26-000018 · form4.xml · nonDerivative · entry 3

Gandhi Prithvi · CIK 0001791227 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,454

F3 · kind: This restricted stock unit award will vest in accordance with the terms of a Retention Agreement, dated February 24, 2026, between Trex Company, Inc. and Prithvi S. Gandhi; as further described in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

SEC source: 0001069878-26-000018 · form4.xml · nonDerivative · entry 2

Gandhi Prithvi · CIK 0001791227 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,360

F2 · kind: This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028, and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

SEC source: 0001069878-26-000018 · form4.xml · nonDerivative · entry 1

Gandhi Prithvi · CIK 0001791227 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,512

F1 · kind: This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028, and March 1, 2029.

SEC source: 0001069878-26-000010 · form4.xml · nonDerivative · entry 1

Tasi Irene · CIK 0002113737 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,256

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000004 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,803

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-26-000002 · form4.xml · nonDerivative · entry 1

Keffer David Christian · CIK 0002034139 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,249

F1 · kind: This restricted stock unit award will vest on the first anniversary of the grant.

SEC source: 0001069878-25-000030 · form4.xml · nonDerivative · entry 1

ROSE B ANDREW · CIK 0001451048 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,578

F1 · kind: This restricted award will vest on the first anniversary of the grant.

SEC source: 0001069878-25-000026 · form4.xml · nonDerivative · entry 1

Gandhi Prithvi · CIK 0001791227 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,664

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $31.835 to $31.93, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4.

SEC source: 0001069878-25-000016 · form4.xml · nonDerivative · entry 1

Gandhi Prithvi · CIK 0001791227 · SVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,664

F1 · kind: This restricted stock unit award cliff vests on October 6, 2028.

SEC source: 0001069878-25-000024 · form4.xml · nonDerivative · entry 1

Fernandez Amy M. · CIK 0001987902 · SVP, CLO and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,151

F1 · kind: This restricted stock unit award will vest in accordance with the terms of a Retention Agreement, dated October 30, 2025, between Trex Company, Inc. and Amy M. Fernandez; as further described in the Company's Quarterly Report on Form 10-Q for the quarterly period ended on September 30, 2025.

SEC source: 0001069878-25-000014 · form4.xml · nonDerivative · entry 1

Rudolph Jacob T. · CIK 0002013330 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,652

F1 · kind: Shares were purchased through the Trex Company, Inc. Amended and Restated 1999 Employee Stock Purchase Plan