Tesoro Corporation (NYSE:TSO) today announced that it will release third quarter earnings before the market opens on Monday, November 9, 2009. The Company will host a conference call that afternoon at 2:30 p.m. ET to discuss quarterly results and other business matters. Interested parties may listen to the live conference call over the Internet by logging on to http://www.tsocorp.com, or via phone by dialing 877-485-3104 (international dial-in: 201-689-8579), event ID 00334395. A telephone replay of the call will be available for one week, and may be accessed via phone by dialing 877-660-6853 (international replay: 201-612-7415) and entering passcode 334395.

The Company also announced today that it will hold an Analyst and Investor Presentation in New York City on Tuesday, November 10, 2009 at 4:30 p.m. ET. Analysts and investors are invited to the Down Town Association in Lower Manhattan to attend the presentation, which will include an update on the 2009 improvement initiatives, the 2010 business plan and capital program. The presentation will be followed by a question and answer session and a cocktail reception with members of senior management. Because space is limited, reservations will be required to attend and accepted on a first-come, first-serve basis. Interested parties should contact Brad McMurray in the Investor Relations department via email at bradford.c.mcmurray@tsocorp.com or phone by calling 210-626-4676.

Tesoro Corporation, a Fortune 100 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 665,000 barrels per day. Tesoro's retail-marketing system includes over 870 branded retail stations, of which over 380 are company operated under the Tesoro®, Shell®, Mirastar® and USA Gasoline™ brands.