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MarkWest Energy Partners Announces Exercise of Option to Purchase Additional Units
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DENVER—April 10, 2008—MarkWest Energy Partners, L.P. (NYSE:MWE) announced today that the underwriters of its common unit offering exercised in full their option to purchase an additional 750,000 common units at $31.15. The option was granted in connection with the Partnership’s offering of 5,000,000 common units, which priced on April 8, 2008. MarkWest expects net proceeds from the offering, including the exercise of the over-allotment option, to be approximately $172 million.

Lehman Brothers and Morgan Stanley acted as joint book-running managers for the offering. RBC Capital Markets and Wachovia Securities acted as senior co-managers, and Deutsche Bank Securities and JPMorgan acted as co-managers. A copy of the final prospectus supplement and related base prospectus associated with this offering may be obtained from the underwriters by contacting Lehman Brothers c/o Broadridge Integrated Distribution Services, 1155 Long Island Avenue, Edgewood, NY 11717, qiana.smith@broadridge.com, fax (631) 254-7140; or Morgan Stanley, Attn: Prospectus Dept., 180 Varick Street, 2nd Floor, New York, New York 10014, prospectus@morganstanley.com, phone (866) 718-1649.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of such state.

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MarkWest Energy Partners, L.P. (NYSE:MWE) is a publicly traded master limited partnership with a solid core of midstream assets and a growing core of gas transmission assets. It is one of the largest processors of natural gas in the Northeast and is the largest gas gatherer of natural gas in the prolific Carthage field in east Texas. It also has a growing number of other gas gathering and intrastate gas transmission assets in the Southwest, primarily in Texas and Oklahoma.

This press release includes “forward-looking statements.” All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Actual results could vary significantly from those expressed or implied in such statements and are subject to a number of risks and uncertainties. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2007, as filed with the SEC. You are urged to carefully review and consider the cautionary statements and other disclosures made in those filings, specifically those under the heading “Risk Factors.” We do not undertake any duty to update any forward-looking statement except as required by law.


MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
or
Nancy Buese, 866-858-0482
Senior VP and CFO
or
Dan Campbell, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com