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MarkWest Energy Partners Announces Full Exercise of Over-Allotment Option

DENVER—August 24, 2009—MarkWest Energy Partners, L.P. (NYSE: MWE) announced today that the underwriters of its common unit offering acquired 825,000 additional primary common units pursuant to the exercise in full of the over-allotment option granted in connection with the Partnership’s offering of 5,500,000 common units, which was completed on August 18, 2009. The offering of 5,500,000 common units included the sale of 300,000 secondary common units by an entity controlled by a director of the general partner of the Partnership. The Partnership intends to use the proceeds, net of underwriting discounts, commissions, and offering expenses payable by the Partnership, of approximately $120.7 million from the sale of 6,025,000 primary common units in the original offering and through the exercise of the over-allotment option to partially fund its ongoing capital expenditure program. Pending that use, the Partnership intends to apply a portion of the net proceeds to pay down borrowings under its revolving credit facility. The Partnership did not receive any proceeds from the sale of secondary common units by the selling unitholder.

Morgan Stanley & Co. Incorporated and UBS Investment Bank are acting as joint bookrunning managers for the offering. The offering is being made only by means of a prospectus supplement and accompanying base prospectuses. A copy of the prospectus supplement and accompanying base prospectuses associated with this offering may be obtained from the underwriters as follows::

Morgan Stanley & Co. Incorporated
Attn: Prospectus Dept.
180 Varick Street, 2nd Floor,
New York, New York 10014
prospectus@morganstanley.com
Toll-Free: (866) 718-1649.

UBS Investment Bank
Attn: Prospectus Dept
299 Park Avenue
New York, NY 10171
Toll-Free: (888) 827-7275

An electronic copy of the prospectus supplement and the accompanying base prospectuses are available from the Securities and Exchange Commission's (SEC) web site at http://www.sec.gov. The common units are being offered pursuant to effective shelf registration statements that the Partnership previously filed with the SEC.

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. is a master limited partnership engaged in the gathering, transportation, and processing of natural gas; the transportation, fractionation, marketing, and storage of natural gas liquids; and the gathering and transportation of crude oil. MarkWest has extensive natural gas gathering, processing, and transmission operations in the southwest, Gulf Coast, and northeast regions of the United States, including the Marcellus Shale, and is the largest natural gas processor in the Appalachian region.

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 the periodic reports we file with the SEC, including our Annual Report on Form 10-K for the year ended December 31, 2008, and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2009. 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