Casulli Edward T. - 15 Dec 2025 Form 3/A - Amendment Insider Report for Talen Energy Corp (TLN)

Role: SVP & Chief Nuclear Officer
Signature: /s/ John C. Wander, attorney-in-fact
Issuer symbol: TLN
Transactions as of: 15 Dec 2025
Net transactions value: $0
Form type: 3/A - Amendment
Filing time: 30 Dec 2025, 12:43:03 UTC
Date Of Original Report: 29 Dec 2025
Next filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Casulli Edward T.	SVP & Chief Nuclear Officer	2929 ALLEN PKWY, SUITE 2200, HOUSTON	/s/ John C. Wander, attorney-in-fact	30 Dec 2025	0002102527

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	TLN	Common Stock						3,603	15 Dec 2025	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	TLN	2023 Restricted Stock Units							15 Dec 2025	Common Stock	6,376		Direct	F1, F2
holding	TLN	2023 Performance-Based Restricted Stock Units							15 Dec 2025	Common Stock	9,564		Direct	F3, F4
holding	TLN	2025 Restricted Stock Units							15 Dec 2025	Common Stock	1,875		Direct	F2, F5
holding	TLN	2025 Performance-Based Restricted Stock Units							15 Dec 2025	Common Stock	2,902		Direct	F4, F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents Restricted Stock Units ("RSUs") that, subject to the reporting person's continued service, will vest on May 17, 2026.
F2	Each RSU was issued under the Talen Energy Corporation 2023 Equity Incentive Plan (the "Plan") and represents a contingent right to receive one share of common stock, par value $0.001 ("common stock"), of Talen Energy Corporation (the "Company") or its cash equivalent, as determined at the time of settlement by the Compensation Committee of the Company's Board of Directors (the "Committee") pursuant to the terms of the Plan
F3	Represents Performance-Based Restricted Stock Unit ("PSUs") that, subject to the reporting person's (i) continued service and (ii) achievement of applicable performance goals, will vest on May 17, 2026. The number of PSUs that vest can range from 0% to 200% of the target number of PSUs subject to the award. The numbers of PSUs and shares of common stock in this row represent the maximum level of performance (or 200%).
F4	Each PSU was issued under the Plan and represents a contingent right to receive one share of common stock or its cash equivalent, as determined at the time of settlement by the Committee pursuant to the terms of the Plan.
F5	Represents RSUs that, subject to the reporting person's continued service, will vest on February 28, 2027.
F6	Represents PSUs that, subject to the reporting person's (i) continued service and (ii) achievement of applicable performance goals, will vest on February 28, 2027. The number of PSUs that vest can range from 0% to 200% of the target number of PSUs subject to the award. The numbers of PSUs and shares of common stock in this row represent the maximum level of performance (or 200%).