Amended Statement of Beneficial Ownership (3/a)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Buckiso Scott D

2. Date of Event Requiring Statement (MM/DD/YYYY) 5/31/2015

3. Issuer Name and Ticker or Trading Symbol

UNITED STATES STEEL CORP [X]

(Last) (First) (Middle)

600 GRANT STREET, 61ST FLOOR

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director _____ 10% Owner
___ X ___ Officer (give title below) _____ Other (specify below)
VP Euro Solutions & Pres USSK /

(Street)

PITTSBURGH, PA 15219

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

6/4/2015

6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Phantom Stock Units ⁽¹⁾	⁽²⁾	⁽²⁾	Common Stock	140.605	⁽³⁾	D

Explanation of Responses:
(1)	The original Form 3 filed on June 4, 2015 is being amended by this Form 3/A solely to include Phantom Stock Units held by the reporting person that were unintentionally omitted. The reporting person currently beneficially owns 1,484.136 Phantom Stock Units.
(2)	The reported phantom stock units were acquired under the United States Steel Corporation Supplemental Thrift Program and are to be settled in cash upon the reporting person's retirement or other termination of service.
(3)	Each phantom stock unit is the economic equivalent of one share of United States Steel Corporation common stock.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Buckiso Scott D 600 GRANT STREET, 61ST FLOOR PITTSBURGH, PA 15219			VP Euro Solutions & Pres USSK

Signatures
/s/ Megan Roby, Attorney-in-Fact for Scott Buckiso		12/15/2017
^** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.