Tesoro Corporation to Webcast First Quarter Conference Call

    Business Editors

    SAN ANTONIO--(BUSINESS WIRE)--April 12, 2005--Tesoro Corporation (NYSE:TSO) has scheduled its first quarter 2005 earnings conference call for 2:00 p.m., CDT, Monday, May 9, 2005. This call is being webcast by CCBN and interested parties may listen to the live conference call over the Internet by logging on to Tesoro's web site at http://www.tsocorp.com at the scheduled time. This presentation will be archived on Tesoro's web site until its next earnings conference call is held.
    The webcast is also being distributed over CCBN's Investor Distribution Network to both institutional and individual investors. Individual investors can listen to the call through CCBN's individual investor center at www.fulldisclosure.com or by visiting any of the investor sites in CCBN's Individual Investor Network. Institutional investors can access the call via CCBN's password-protected event management site, StreetEvents (www.streetevents.com).
    Individuals wishing to listen to Tesoro's conference call from its Internet site will need Windows Media Player, which can be downloaded free of charge from http://www.tsocorp.com. Please allow at least fifteen minutes to complete the download.
    Tesoro Corporation, a Fortune 500 Company, is an independent refiner and marketer of petroleum products. Tesoro operates six refineries in the western United States with a combined capacity of nearly 560,000 barrels per day. Tesoro's retail-marketing system includes over 500 branded retail stations, of which over 200 are company operated under the Tesoro(R) and Mirastar(R) brands.

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CONTACT: Tesoro Corporation Investors: A. Pierre Dubois, 210-283-2164 or Media: Tara Payne, 210-283-2676

KEYWORD: TEXAS INDUSTRY KEYWORD: OIL/GAS ENERGY UTILITIES EARNINGS CONFERENCE CALLS SOURCE: Tesoro Corporation

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