X0202 SCHEDULE 13D/A 0001182451 XXXXXXXX LIVE 18 COMMON STOCK 05/15/2026 false 0000850429 894650100 TREDEGAR CORPORATION

1100 BOULDERS PKWY RICHMOND VA 23225

John D. Gottwald 804-366-1393 c/o John D. Gottwald 330 South Fourth Street Richmond VA 23219 William M. Gottwald 804-366-1393 c/o John D. Gottwald 330 South Fourth Street Richmond VA 23219 James T. Gottwald 804-366-1393 c/o John D. Gottwald 330 South Fourth Street Richmond VA 23219 Residual 10-Year CLAT UA FDGJR 804-366-1393 c/o John D. Gottwald 330 South Fourth Street Richmond VA 23219 Janet T. Geldzahler 202-956-7515 Sullivan & Cromwell LLP 1700 New York Avenue, N.W., Suite 700 Washington DC 20006-5215 0001182451 N John D. Gottwald a N X1 1917639 4079814 1917639 4079814 5997453 Y 17.1 IN Y William M. Gottwald a N X1 211260 4090597 211260 4090597 4301857 Y 12.3 IN Y James T. Gottwald a N X1 40000 4180597 40000 4180597 4220597 Y 12.1 IN Y Residual 10-Year CLAT UA FDGJR Living Trust a N X1 0 1447405 0 1447405 1447405 N 4.1 OO * Amendment No. 18 amends and supplements Amendment Nos. 1 through 17 to the statement on Schedule 13D initially filed on August 15, 1989 with respect to shares of common stock (the "Common Stock") of Tredegar Corporation (the "Issuer"). 1 In computing the percentage ownership, each of the Reporting Persons assumed that there are 35,016,819 shares of Common Stock outstanding, as reported by Tredegar Corporation in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, as filed with the Securities and Exchange Commission on May 8, 2026. COMMON STOCK TREDEGAR CORPORATION 1100 BOULDERS PKWY RICHMOND VA 23225 Amount Beneficially Owned: John D. Gottwald-5,997,453shares, 17.1%; William M. Gottwald-4,301,857 shares, 12.3%; James T. Gottwald-4,220,597 shares, 12.1 %; Residual 10-Year CLAT UA FDGJR Living Trust("CLAT'')-1,447,405 shares, 4.1 %, all reporting persons-6,349,496 shares, 18.1 % (i) Sole power to vote or direct the vote: John D. Gottwald-1,917,639 shares, 5.5%; William M. Gottwald-211,260 shares, 0.6%; James T. Gottwald-40,000 shares, 0.1 %; all reporting persons-2,168,899 shares, 6.2% (ii) Shared power to vote or to direct the vote-John D. Gottwald-4,079,814 shares, 11.7%; William M. Gottwald 4,090,597 shares, 11.7%; James T. Gottwald-4,180,597 shares, 11.9%; CLAT 1,447,405 shares, 4.1%; all reporting persons-4,180,597 shares, 11.9% (iii) Sole power to dispose of or to direct the disposition of-John D. Gottwald-1,917,639 shares, 5.5%; William M. Gottwald-211,260 shares, 0.6%; James T. Gottwald-40,000 shares, 0.1 %; all reporting persons-2,168,899 shares, 6.2% (iv) Shared power to dispose of or to direct the disposition of -John D. Gottwald-4,079,814 shares, 11.7%; William M. Gottwald-4,090,597 shares, 11.7%; James T. Gottwald-4,180,597 shares, 11.9%; CLAT -1,447,405 shares, 4.1%; all reporting persons-4,180,597 shares, 11.9% Transactions in shares in the past sixty days: Exhibit 99.2 sets forth the shares sold by CLAT on the New York Stock Exchange in the past sixty days. No other persons have the right to receive or the power to direct the receipt of dividends, or the proceeds from the sale of the shares described in Item 5. Exhibit 99.1. Agreement between John D. Gottwald, William M. Gottwald, James T. Gottwald and the Residual 10-Year CLAT UA FDGJR Living Trust with respect to the filing of this Amendment No. 18 to the statement to Schedule 13D. Exhibit 99.2 Shares sold by CLAT on the New York Stock Exchange in the past sixty days. John D. Gottwald /s/ William M. Gottwald 05/19/2026 William M. Gottwald /s/ William M. Gottwald 05/19/2026 James T. Gottwald /s/ William M. Gottwald 05/19/2026 Residual 10-Year CLAT UA FDGJR Living Trust /s/ William M. Gottwald 05/19/2026