YOUR VOTE IS VERY IMPORTANT! NOT voting will have the same effect as a vote against the transaction! VOTING IS EASY Please use the WHITE
proxy card or WHITE voting instruction form to vote your units FOR the MRMC transaction today. VOTE ONLINE If you are a unitholder of record, you may submit your proxy electronically via the Internet by accessing the Internet address provided on
each proxy card and following the instructions provided. If your common units are held by a broker, bank or other nominee, also known as holding units in “street name,” you should receive instructions from the broker, bank or other
nominee. Please review such instructions to determine your voting deadline and whether you will be able to vote via the Internet. VOTE BY PHONE If you are a unitholder of record, you may submit your proxy by using the toll-free telephone number
listed on the enclosed proxy card and following the instructions provided. If your common units are held by a broker, bank or other nominee, you should receive instructions from the broker, bank or other nominee. Please review such instructions to
determine your voting deadline and whether you will be able to vote by telephone. VOTE BY MAIL You may submit your proxy by filling out, signing and dating the enclosed WHITE proxy card (if you are a unitholder of record) or voting instruction form
(if your common units are held by a broker, bank or other nominee) and returning it by mail in the prepaid envelope provided. FOR QUESTIONS Unitholders who have questions or would like additional information or assistance voting their units should
contact Martin Midstream Partners L.P.’s proxy solicitor: INNISFREE M&A INCORPORATED Toll-free at (877) 750-8334 (from the U.S. and Canada) or at +1 (412)
232-3651 (from other countries) Forward Looking Statements This document includes “forward-looking statements” as defined by the Securities and Exchange Commission (the “SEC”).
Forward-looking statements are identified by words such as “anticipate,” “believe,” “expect,” “intend,” “may,” “plan,” “should,” “will” or similar expressions. These
forward-looking statements and all references to the transaction described herein rely on a number of assumptions concerning future events and are subject to a number of uncertainties, including (i) the ability of the parties to consummate the
transaction in the anticipated timeframe or at all, including MRMC’s ability to fund the aggregate merger consideration; risks related to the satisfaction or waiver of the conditions to closing the transaction in the anticipated timeframe or at
all; risks related to obtaining the requisite regulatory approval and MMLP unitholder approval; disruption from the transaction making it more difficult to maintain business and operational relationships; significant transaction costs associated
with the transaction; and the risk of litigation and/or regulatory actions related to the transaction, (ii) uncertainties relating to MMLP’s future cash flows and operations, (iii) MMLP’s ability to pay future distributions,
(iv) future market conditions, (v) current and future governmental regulation, (vi) future taxation, and (vii) other factors, many of which are outside MMLP’s control, which could cause actual results to differ materially
from such statements. While MMLP believes that the assumptions concerning future events are reasonable, it cautions that there are inherent difficulties in anticipating or predicting certain important factors. A discussion of these factors,
including risks and uncertainties, is set forth in MMLP’s annual and quarterly reports filed from time to time with the SEC as well as MMLP’s definitive proxy statement filed with the SEC on November 27, 2024. Forward-looking
statements speak only as of the date they are made, and MMLP disclaims any intention or obligation to revise any forward-looking statements, including financial estimates, whether as a result of new information, future events, or otherwise except
where required to do so by law. Important Information about the Proposed Transaction In connection with the proposed merger, MMLP has filed with the SEC and furnished to MMLP’s unitholders the definitive proxy statement on Schedule 14A and a
proxy card. MMLP, MRMC and certain of their affiliates have jointly filed a transaction statement on Schedule 13E-3 (the “Schedule 13E-3”) with the SEC. This
material is not a substitute for the Merger Agreement, the proxy statement or the Schedule 13E-3 or for any other document that MMLP has filed with the SEC in connection with the proposed transaction. The
final proxy statement was mailed to MMLP’s unitholders on or about November 27, 2024 to the unitholders of record as of the close of business on November 8, 2024. BEFORE MAKING ANY VOTING DECISION, MMLP’S UNITHOLDERS ARE URGED TO
READ THE MERGER AGREEMENT, THE PROXY STATEMENT AND THE SCHEDULE 13E-3 AND ANY OTHER DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE PROPOSED MERGER OR INCORPORATED BY REFERENCE IN THE PROXY STATEMENT OR
SCHEDULE 13E-3 (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER. Investors and security holders may
obtain free copies of the proxy statement and other relevant documents filed with the SEC by MMLP through the website maintained by the SEC at www.sec.gov. In addition, the proxy statement, the Schedule 13E-3,
and other documents filed with the SEC by MMLP are available free of charge through MMLP’s website at www.MMLP.com, in the “Investor Relations” tab, or by contacting MMLP’s Investor Relations Department at (877) 256-6644. Participants in the Solicitation MMLP and the directors and executive officers of MMLP’s general partner, and MRMC and its directors and executive officers, may be deemed to be participants in the
solicitation of proxies from MMLP’s unitholders in respect of the proposed merger. Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of the unitholders of MMLP in connection with
the proposed transaction, including a description of their direct or indirect interests, by security holdings or otherwise, are included in the proxy statement, as filed with the SEC on November 27, 2024, and other relevant materials filed with
the SEC. Information about the directors and executive officers of MMLP’s general partner and their ownership of MMLP common units is also set forth in MMLP’s Form 10-K for the year ended
December 31, 2023, as previously filed with the SEC on February 21, 2024. To the extent that their holdings of MMLP’s common units have changed since the amounts set forth in MMLP’s Form
10-K, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Free copies of these documents may be obtained as described in the paragraphs above. Vote
TODAY “FOR” the transaction. Visit MaximizeValueforMMLP.com for more information.