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    Unitholder Services

    MPLX LP's common units are traded on the New York Stock Exchange under the common unit ticker symbol MPLX.

    Unitholder Services

    Computershare is the transfer agent and registrar for MPLX LP's registered unitholders. 

    Computershare
    P.O. Box 505000
    Louisville, KY 40233-5000

    By overnight delivery: 462 South 4th Street, Suite 1600
    Louisville, KY 40202
    Internet Inquires: 

    InvestorCentreTM website at www.computershare.com/investor

    Telephone Inquires:  Toll Free: 877-373-6374 (U.S., Canada and Puerto Rico)
    Toll: 781-575-2879 (other, non-U.S. jurisdictions)
    Email: 

    web.queries@computershare.com 

    Unitholder Online Account Access

    For your convenience, you may access your unitholder account online at Computershare's Investor CentreTM. Access will require a User ID number and Password. New members may set up their account access using the Create Login tab at the middle-left of the Computershare's Investor CentreTM login page. Should you need additional assistance, please contact Computershare toll-free at 877-373-6374

    Independent Registered Public Accounting Firm

    Pricewaterhouse Coopers LLP
    One Seagate, Suite 1800
    Toledo, OH  43604-1574

    Distribution Payments

    Quarterly distributions, if any, are expected to be made within 60 days after the end of each calendar quarter to holders of record on or about the first day of each such month

    Receipt of IRS Schedule K-1

    MPLX intends to furnish to each unitholder, within 90 days after the close of each calendar year, specific tax information, including a Schedule K-1, which describes such unitholder’s share of MPLX income, gain, loss and deduction for the preceding taxable year.

    Distribution Checks Not Received/Electronic Deposit

    If you do not receive your distribution check within 60 days of each calendar quarter-end, we suggest that you wait at least 10 additional days to allow for any delay in mail delivery. After that time, advise Computershare to issue a replacement check. You may contact Computershare to authorize electronic deposit of your distributions or interest into your bank account.

    Unitholder Publications

    Comprehensive and consolidated financial statements (SEC Forms 10-K, 10-Q, and 8K) are available online at the SEC's Edgar DatabaseTM.

    Address Change

    It is important that you notify Computershare immediately when you change your address. As a convenience, you also may make your address change online via Computershare's Investor CentreTM.

    Taxpayer Identification Number

    Federal law requires that each unitholder provide a certified Taxpayer Identification Number (TIN) for his/her unitholder account. For individual unitholders, your TIN is your Social Security Number. If you do not provide a certified TIN, Computershare may be required to withhold 28 percent for federal income taxes from your dividends.

    MarkWest Energy Partners, L.P. Unitholders

    On December 4, 2015, MarkWest Energy Partners, L.P., merged with MPLX LP. The holders of MarkWest Energy Partners, L.P. received MPLX LP units and cash in exchange for MarkWest Energy Partners L.P. units. Tax information for MarkWest Energy Partners, L.P. unitholders.

    Andeavor Logistics LP (ANDX) Unitholders

    On July 30, 2019, Andeavor Logistics LP ("ANDX") merged with and into MPLX LP. The holders of ANDX units received MPLX LP units in exchange for their ANDX units. Information regarding material U.S. federal income tax consequences of the merger can be found starting on page 14 of the consent statement/prospectus that was filed with the Securities and Exchange Commission ("SEC") on June 28, 2019.

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    MPLX

    • Marathon Petroleum Corporation

    About MPLX

    • Logistics and Storage
    • Gathering and Processing
    • Southwest Gathering
    • Board of Directors
    • Officers
    • MPLX Fact Sheet
    • Image Gallery
    • Terms of Use
    • Privacy Policy

    Investors

    • Corporate Governance
      • Governance Principles
      • Board of Directors
      • Board Committees and Charters
      • Communications from Interested Parties
      • Officers
      • Code of Ethics for Senior Financial Officers
      • Code of Business Conduct
      • Policies and Guidelines
      • Certificate of Limited Partnership
      • CEO/CFO Certifications
    • Calendar of Events
    • SEC Filings
    • Press Releases
    • Earnings Capsule
    • Quarterly Investor Packet
    • Stock Information
      • Stock Quote and Chart
      • Distribution History
    • Annual Report & 10-K
    • Unitholder Services
    • Events and Presentations
    • Investor FAQs
    • Tax Reporting Package
    • Email Alerts
    • Corporate Governance
      • Governance Principles
      • Board of Directors
      • Board Committees and Charters
      • Communications from Interested Parties
      • Officers
      • Code of Ethics for Senior Financial Officers
      • Code of Business Conduct
      • Policies and Guidelines
      • Certificate of Limited Partnership
      • CEO/CFO Certifications
    • Calendar of Events
    • SEC Filings
    • Press Releases
    • Earnings Capsule
    • Quarterly Investor Packet
    • Stock Information
      • Stock Quote and Chart
      • Distribution History
    • Annual Report & 10-K
    • Sustainability Reporting
    • Unitholder Services
    • Events and Presentations
    • Investor FAQs
    • Tax Reporting Package
    • Email Alerts

    Contact Us

    • Investor Relations
    • Unitholder Services
    • Corporate Public Affairs
    • MPC Supply Chain

    Customer Portal

    MarkWest

    • Visit the MarkWest site
    • Pipeline Launcher/Receiver Emission Reduction Systems

    Marathon Pipe Line

    For Operation, Environmental and Safety Info: Marathon Pipe Line LLC