PAUL ANTHONY MASCARENAS - 18 Jun 2025 Form 4 Insider Report for UNITED STATES STEEL CORP (X)

Role: Director
Signature: /s/ Megan Bombick By Power of Attorney from Paul A. Mascarenas
Issuer symbol: X
Transactions as of: 18 Jun 2025
Transactions value $: $0
Form type: 4
Filing time: 18 Jun 2025, 20:28:32 UTC
Previous filing: 16 May 2025
Next filing: 01 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MASCARENAS PAUL ANTHONY	Director	600 GRANT STREET, PITTSBURGH	/s/ Megan Bombick By Power of Attorney from Paul A. Mascarenas	18 Jun 2025	0001625756

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	X	COMMON STOCK	Disposed to Issuer		-82.6K	-100%		0	18 Jun 2025	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	On June 18, 2025, United States Steel Corporation (the "Company") consummated the merger transaction (the "Merger") contemplated by that certain Agreement and Plan of Merger (the "Merger Agreement"), dated as of December 18, 2023, by and among Nippon Steel North America, Inc., a New York corporation ("Parent"), 2023 Merger Subsidiary, Inc., a Delaware corporation and a wholly owned subsidiary of Parent, and the Company. The effective time of the Merger is referred to herein as the "Effective Time".
F2	Reflects (i) shares of common stock of the Company, par value $1.00 (the "Shares"), held directly by the reporting person, (ii) restricted stock units of the Company held by the reporting person, and (iii) deferred restricted stock units of the Company held by the reporting person that, in each case, as of immediately prior to the Effective Time, were converted into the right to receive $55 in cash per Share in accordance with the terms of the Merger Agreement.

Content

On June 18, 2025, United States Steel Corporation (the "Company") consummated the merger transaction (the "Merger") contemplated by that certain Agreement and Plan of Merger (the "Merger Agreement"), dated as of December 18, 2023, by and among Nippon Steel North America, Inc., a New York corporation ("Parent"), 2023 Merger Subsidiary, Inc., a Delaware corporation and a wholly owned subsidiary of Parent, and the Company. The effective time of the Merger is referred to herein as the "Effective Time".

Reflects (i) shares of common stock of the Company, par value $1.00 (the "Shares"), held directly by the reporting person, (ii) restricted stock units of the Company held by the reporting person, and (iii) deferred restricted stock units of the Company held by the reporting person that, in each case, as of immediately prior to the Effective Time, were converted into the right to receive $55 in cash per Share in accordance with the terms of the Merger Agreement.