SCHEDULE 13G/A 0001104659-24-117755 0001687509 XXXXXXXX LIVE 3 Common Stock, $0.001 par value per share 09/30/2025 0001622536 Talen Energy Corporation 87422Q109 2929 Allen Parkway, Suite 2200 Houston TX 77019 Rule 13d-1(d) Rubric Capital Management LP DE 0.00 3550000.00 0.00 3550000.00 3550000.00 N 7.77 IA PN David Rosen X1 52171.00 3550000.00 52171.00 3550000.00 3602171.00 N 7.88 HC IN Talen Energy Corporation 2929 Allen Parkway, Suite 2200, Houston, TX, 77019 This statement is filed by: (i) Rubric Capital Management LP ("Rubric Capital"), the investment adviser to certain investment funds and/or accounts (collectively, the "Rubric Funds") that hold the shares of common stock, par value $0.001 (the "Common Stock") of Talen Energy Corporation, a Delaware corporation (the "Issuer") reported herein; and (ii) David Rosen ("Mr. Rosen"), Managing Member of Rubric Capital Management GP LLC, the general partner of Rubric Capital. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The filing of this statement should not be construed as an admission that any of the forgoing persons or any Reporting Person is, for the purposes of Section 13 of the Act, the beneficial owner of the shares of Common Stock reported herein. The address of the principal business office of each of the Reporting Persons is 155 East 44th St, Suite 1630, New York, NY 10017. Rubric Capital is a Delaware limited partnership. Mr. Rosen is a citizen of the United States of America. Y The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentage set forth in Row (11) of the cover page for each of the Reporting Persons and in Item 4(b) is based on the 45,685,316 shares of Common Stock outstanding as of August 7, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2025 filed with the Securities and Exchange Commission on August 7, 2025. 7.88 The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference. Y N See Item 2(a). Rubric Capital Master Fund LP, a Rubric Fund, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, more than 5% of the Common Stock. Y Y Y Y Rubric Capital Management LP /s/ Michael Nachmani 11/14/2025 David Rosen /s/ David Rosen 11/14/2025