8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 20, 2012

Tesoro Corporation

(Exact name of registrant as specified in its charter)

Delaware	1-3473	95-0862768
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

19100 Ridgewood Pkwy San Antonio, Texas	78259-1828
(Address of principal executive offices)	(Zip Code)

(210) 626-6000

(Registrant's telephone number,

including area code)

Not Applicable

(Former name or former address, if

changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(d) Election of Directors.

Effective December 20, 2012, Ms. Mary Pat McCarthy became a member of the Board of Directors (the “Board”) of Tesoro Corporation (“the Company”) and concurrently the Board increased the number of directors from nine to ten. The Board determined that Ms. McCarthy meets the independence requirements under the rules of the New York Stock Exchange and the Company’s independence standards and that there are no transactions between Ms. McCarthy and the Company that would require disclosure under Item 404(a) of Regulation S-K. Ms. McCarthy will immediately serve on the Board’s Governance Committee and will serve on the Audit Committee upon the filing of the Company’s 2012 Annual Report on Form 10-K. The Press Release announcing Ms. McCarthy’s election is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

     d)   Exhibits.

99.1 Press Release dated December 27, 2012.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: December 27, 2012

TESORO CORPORATION
By:	/s/ CHARLES S. PARRISH
	Charles S. Parrish
	Executive Vice President, General Counsel and Secretary

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Index to Exhibits

Exhibit Number	Description of the Exhibit
99.1	Press release dated December 27, 2012.

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EX-99.1

Exhibit 99.1

CONTACTS:
Media:	210-626-7702
	media@tsocorp.com
Investors:	Louie Rubiola
	210-626-4355

TESORO ANNOUNCES ELECTION OF MARY PAT MCCARTHY TO BOARD OF DIRECTORS

SAN ANTONIO - December 27, 2012 - Tesoro Corporation (NYSE:TSO) today announced the appointment of Mary Pat McCarthy to the Company's Board of Directors, increasing the Board from nine to ten members, effective December 20, 2012.

Ms. McCarthy in 2011 retired from her position as Vice Chair of KPMG LLP, the U.S. member firm of the global audit, tax and advisory services firm. She joined KPMG LLP in 1977 and was admitted to partnership in 1987. Ms. McCarthy held numerous senior leadership roles with KPMG, including Executive Director of the KPMG Audit Committee Institute (2008-2011); Leader of the KPMG Client Care Program (2007-2008); U.S. Leader, Industries and Markets; and Global Leader, Information, Communication and Entertainment Practice. She also served on the KPMG Management and Operations Committees.

Ms. McCarthy graduated Magna Cum Laude with a Bachelor of Science in Business Administration from Creighton University. She attended the KPMG International Development Program at the University of Pennsylvania's Wharton School; and is a licensed Certified Public Accountant in California, Kansas and Missouri.

She is an author of several books on risk, strategy and business transformation; is a contributing author to National Association of Corporate Directors (NACD) Blue Ribbon Commission Reports; and frequently speaks at conferences and other forums on audit committee effectiveness and corporate governance. Ms. McCarthy also serves as a director of Mutual of Omaha, a mutual insurance company.

“We are very pleased to welcome Mary Pat to our Board of Directors,” said Greg Goff, president and CEO, Tesoro. Her strong leadership and significant financial, governance, and accounting expertise will bring additional strengths and new perspectives to our Board.”

About Tesoro Corporation

Tesoro Corporation, a Fortune 150 company, is an independent refiner and marketer of petroleum products.  Tesoro, through its subsidiaries, operates seven refineries in the western United States with a combined capacity of approximately 675,000 barrels per day.  Tesoro's retail-marketing system includes nearly 1,390 branded retail stations, of which 595 are company operated under the Tesoro^®, Shell^® and USA Gasoline™ brands.