| 8/9/2010 | MarkWest Energy Partners Reports Second Quarter Financial Results |
| 7/22/2010 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 7/9/2010 | MarkWest Energy Partners Announces Release Date for Second Quarter 2010 Financial Results |
| 7/1/2010 | MarkWest Announces New $700 Million Revolving Credit Facility |
| 6/1/2010 | MarkWest Liberty Midstream & Resources and Sunoco Logistics Announce New Marcellus Ethane Pipeline and Marine Project |
| 5/17/2010 | MarkWest Announces Annual Meeting of Common Unitholders and Investor Conference |
| 5/10/2010 | MarkWest Energy Partners Reports Record Quarterly Distributable Cash Flow and Increases 2010 Guidance |
| 4/26/2010 | NiSource Gas Transmission & Storage and MarkWest Liberty Midstream & Resources Announce Plans to Move More Northern W.Va Marcellus Production to Market |
| 4/22/2010 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 4/19/2010 | MarkWest Energy Partners Announces Release Date for First Quarter 2010 Financial Results |
| 4/15/2010 | MarkWest Liberty Midstream & Resources Executes New Producer Agreements and Expands Processing and Fractionation in the Marcellus |
| 4/6/2010 | MarkWest Energy Partners Announces Closing of Common Unit Offering and Full Exercise of Over-Allotment Option |
| 3/31/2010 | MarkWest Energy Partners Announces Pricing of Upsized Public Offering of Common Units |
| 3/30/2010 | MarkWest Energy Partners Announces Public Offering of Common Units |
| 3/19/2010 | MarkWest Energy Partners to Present at Upcoming Conferences |
| 3/1/2010 | MarkWest Energy Partners Reports Record Quarterly Distributable Cash Flow |
| 1/27/2010 | MarkWest Energy Partners Announces Change to Board of Directors |
| 1/26/2010 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 1/7/2010 | MarkWest Energy Partners Announces Release Date for Fourth Quarter and Full Year 2009 Financial Results |
| 1/4/2010 | MarkWest Energy Partners Announces Sale of Joint Venture Interest in Starfish Pipeline Company, LLC |
| 11/12/2009 | MarkWest Energy Partners to Present at Upcoming Conferences |
| 11/9/2009 | MarkWest Energy Partners Reports Third Quarter 2009 Financial Results |
| 10/22/2009 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 10/20/2009 | MarkWest Energy Partners to Present at 2nd Annual Platts Appalachian Gas Conference |
| 10/13/2009 | MarkWest Energy Partners to Present at the Hart''s Developing Unconventional Gas Conference |
| 10/5/2009 | MarkWest Pioneer Announces Decision Regarding Option to Acquire Equity Interest in Midcontinent Express Pipeline |
| 10/1/2009 | MarkWest Energy Partners Announces Release Date for Third Quarter 2009 Financial Results |
| 9/15/2009 | MarkWest Liberty Midstream & Resources Executes Agreements with Chesapeake Appalachia, L.L.C. and Statoil Natural Gas LLC and Announces the Planned Construction of a Second Major Processing Complex in the Marcellus |
| 9/10/2009 | MarkWest Energy Partners to Present at the 2009 Master Limited Partnership Investor Conference |
| 9/3/2009 | MarkWest Energy Partners to Present at the Barclays Capital CEO Energy/Power Conference |
| 9/1/2009 | MarkWest Energy Partners Announces Sale of Steam Methane Reformer |
| 8/24/2009 | MarkWest Energy Partners Announces Full Exercise of Over-Allotment Option |
| 8/13/2009 | MarkWest Energy Partners Announces Pricing of Upsized Public Offering of Common Units |
| 8/12/2009 | MarkWest Energy Partners Announces Public Offering of Common Units |
| 8/10/2009 | MarkWest Energy Partners Reports Second Quarter 2009 Financial Results |
| 8/10/2009 | MarkWest Energy Partners and Midstream & Resources Announce Expansion of Marcellus Projects and Amendment to Marcellus Shale Joint Venture |
| 7/23/2009 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 7/21/2009 | MarkWest Energy Partners Announces Release Date for Second Quarter 2009 Financial Results |
| 6/29/2009 | MarkWest Pioneer Announces Non-Binding Open Season / Reverse Open Season for the Arkoma Connector Pipeline |
| 6/10/2009 | MarkWest Energy Partners Announces Public Unit Overallotment Exercise |
| 6/5/2009 | MarkWest Announces Public Unit Pricing |
| 6/4/2009 | MarkWest Energy Partners Announces Public Offering of Common Units |
| 5/27/2009 | MarkWest Energy Partners Announces 2009 Annual Meeting of Unitholders |
| 5/26/2009 | MarkWest Energy Partners Closes $150 Million Private Placement of 6.875% Senior Notes Due 2014 |
| 5/20/2009 | MarkWest Energy Partners Announces $150 Million Private Placement of 6.875% Senior Notes Due 2014 |
| 5/20/2009 | MarkWest Energy Partners Prices $150 Million Private Placement of 6.875% Senior Notes Due 2014 |
| 5/11/2009 | MarkWest Energy Partners Reports First Quarter 2009 Financial Results |
| 5/7/2009 | MarkWest Liberty Midstream & Resources Announces Successful Launch of Marcellus Shale Cryogenic Processing Plant |
| 5/4/2009 | MarkWest Energy Partners and ArcLight Capital Announce Formation of Arkoma Connector Joint Venture |
| 4/28/2009 | MarkWest Energy Partners Announces Release Date for First Quarter 2009 Financial Results |
| 4/23/2009 | MarkWest Energy Partners Announces Quarterly Cash Distribution |
| 3/3/2009 | MarkWest Energy Partners Announces Availability of 2008 Schedule K-1s |
| 3/2/2009 | MarkWest Energy Partners and Midstream & Resources Announce Closing of Marcellus Shale Partnership |
| 3/2/2009 | MarkWest Energy Partners Reports Fourth Quarter and Full Year 2008 Financial Results |
| 2/13/2009 | MarkWest Energy Partners Announces Release Date for Fourth Quarter and Full Year 2008 Financial Results |
| 2/1/2009 | MarkWest Energy Partners to Present at the JP Morgan Global High Yield & Leveraged Finance Conference |
| 1/27/2009 | MarkWest Energy Partners and NGP Midstream & Resources Announce Marcellus Shale Joint Venture |
| 1/27/2009 | MarkWest Energy Partners Announces Quarterly Cash Distribution and Increases Liquidity by $285 Million |
| 12/4/2008 | MarkWest Energy Partners to Present at the 2008 Wachovia Pipeline and MLP Conference |
| 12/2/2008 | MarkWest Energy Partners to Present at the J.P. Morgan 2008 SMid Cap Conference |
| 11/10/2008 | MarkWest Energy Partners Reports Third Quarter 2008 Financial Results |
| 10/22/2008 | Range and Markwest Announce Commencement of Marcellus Gas Processing Plant and Investor Site Tour |
| 10/22/2008 | MWE Increases Quarterly Cash Distribution by 16 Percent Compared to Prior Year Quarter |
| 10/22/2008 | Frank M. Semple Elected Chairman of the Board and John M. Fox Elected as Lead Director of the Board of Directors of the General Partner of MarkWest Energy Partners |
| 10/21/2008 | NiSource unit Columbia Gas Transmission and MarkWest Energy Partners Announce Additional Plans to Expand Natural Gas Midstream Services in West Virginia |
| 8/13/2008 | NiSource subsidiary Columbia Gas Transmission and MarkWest Energy Partners Announce Plans to Move More Appalachian Gas to Market |
| 8/11/2008 | MarkWest Energy Partners Reports Second Quarter 2008 Financial Results |
| 8/6/2008 | MarkWest Acquires Gathering Assets from Petroquest Energy for $41.3 Million |
| 7/24/2008 | MarkWest Energy Partners Increases Quarterly Cash Distribution by 19 Percent Compared to Prior Year Quarter |
| 6/17/2008 | Range Resources and MarkWest Energy Partners Announce Marcellus Shale Agreement |
| 5/12/2008 | MarkWest Energy Partners Increases Equity Ownership in Centrahoma Processing LLC |
| 5/12/2008 | MarkWest Energy Partners Reports First Quarter 2008 Financial Results Record $55 Million of Cash Available for Distribution to Common Unitholders |
| 4/28/2008 | MarkWest Energy Partners Announces $100 Million Follow-on Debt Offering |
| 4/24/2008 | MarkWest Energy Partners Increases Quarterly Cash Distribution by 18 Percent Compared to Prior Year Quarter |
| 4/10/2008 | MarkWest Energy Partners Announces Exercise of Option to Purchase Additional Units |
| 4/10/2008 | MarkWest Energy Partners Prices $400 Million Private Placement of 8.75% Senior Notes Due 2018 |
| 4/8/2008 | MarkWest Energy Partners Announces Pricing of Public Offering of Common Units |
| 4/8/2008 | MarkWest Energy Partners Announces $250 Million Private Placement of Senior Notes Due 2018 |
| 4/7/2008 | MarkWest Energy Partners Announces Public Offering of Common Units |
| 3/20/2008 | MarkWest Energy Partners Announces Open Season for Arkoma Connector Pipeline |
| 3/4/2008 | MarkWest Energy Partners Announces 2007 Schedule K-1s are Available |
| 3/3/2008 | MarkWest Energy Partners Reports Fourth Quarter and Full Year 2007 Financial Results |
| 2/26/2008 | MarkWest Announces Final Results of Merger Consideration Elections |
| 2/25/2008 | MarkWest Energy Partners Announces Release Date for Fourth Quarter 2007 Financial Results |
| 2/21/2008 | MarkWest Announces Preliminary Results of Merger Consideration Elections |
| 2/21/2008 | MarkWest Announces Approval of Redemption and Merger |
| 1/28/2008 | MarkWest Energy Partners Announces Arkoma Connector Pipeline and Option to Purchase an Interest in Midcontinent Express Pipeline |
| 1/24/2008 | MarkWest Energy Partners Increases Quarterly Cash Distribution to $0.57 per Unit |
| 1/7/2008 | SEC Declares MarkWest Registration Statement / Joint Proxy Statement on Form S-4 Effective |
| 1/3/2008 | MarkWest Energy Partners and MarkWest Hydrocarbon Announce Record Date and Shareholder Meeting Date |
| 12/18/2007 | MarkWest Energy Partners Announces $90 Million Private Placement |
| 12/12/2007 | MarkWest Energy Partners Announces $50 Million Expansion in East Texas |
| 11/30/2007 | MarkWest Energy Partners to Present at the Wachovia Pipeline and Energy MLP Symposium |
| 11/30/2007 | MarkWest Energy Partners to Present at the Bank of America Credit Conference |
| 11/20/2007 | MarkWest Energy Partners Announces $60 Million Expansion in Appalachia |
| 11/13/2007 | MarkWest Energy Partners Announces Javelina Processing Agreement |
| 11/6/2007 | MarkWest Energy Partners Reports Third Quarter 2007 Financial Results |
| 10/30/2007 | MarkWest Energy Partners Announces Release Date for Third Quarter 2007 Financial Results |
| 10/25/2007 | MarkWest Energy Partners Increases Quarterly Cash Distribution to $0.55 Per Unit |
| 10/4/2007 | MarkWest to Construct $100 Million Expansion of Javelina Project |
| 10/2/2007 | MarkWest Energy Partners Acquires Gathering Assets from Canaan Resources; MarkWest to Invest Up to $30 Million to Expand Existing Gathering System |
| 10/2/2007 | MarkWest Energy Partners to Present at Deutsche Bank Leveraged Finance Conference |
| 9/5/2007 | MarkWest Energy Partners to Merge with MarkWest Hydrocarbon |
| 8/20/2007 | MarkWest Energy Partners to Present at the 12th Oil and Gas Conference |
| 8/8/2007 | MarkWest Energy Partners Reports Second Quarter 2007 Financial Results; Distributable Cash Flow Increases 19 Percent Compared to Prior Year Quarter |
| 8/2/2007 | MarkWest Energy Partners Announces $20 Million Expansion in Western Oklahoma |
| 7/19/2007 | MarkWest Energy Partners Increases Quarterly Cash Distribution to $0.53 Per Unit |
| 5/15/2007 | MarkWest Energy Partners Celebrates Transfer to the NYSE |
| 5/7/2007 | MarkWest Energy Partners Reports First Quarter 2007 Financial Results; Distributable Cash Flow Increases 38 Percent Compared to Prior Year Quarter |
| 5/1/2007 | MarkWest Energy Partners Transfers Common Unit Listing to the New York Stock Exchange |
| 4/23/2007 | MarkWest Energy Partners Files Application to Transfer to the New York Stock Exchange |
| 4/19/2007 | MarkWest Energy Partners Declares First Quarter 2007 Cash Distribution of $0.51 Per Unit and Announces Intent to Transfer to the New York Stock Exchange |
| 4/9/2007 | MarkWest Energy Partners Announces $135 Million Private Placement |
| 3/5/2007 | MarkWest Energy Partners Reports 2006 Fourth Quarter and Full Year Financial Results |
| 2/23/2007 | MarkWest Energy Partners Announces Extension of Senior Notes Exchange Offer |
| 2/21/2007 | MarkWest Energy Partners to Review Restructuring Alternatives with MarkWest Hydrocarbon |
| 1/25/2007 | MarkWest Energy Partners Declares Cash Distribution and Announces Two-for-One Unit Split |
| 1/3/2007 | MarkWest Energy Partners Acquires Santa Fe Gathering, L.L.C and the Grimes Gathering System |
| 12/11/2006 | MarkWest Energy Partners Announces Early Completion of Portion of Mid-Stream Assets for Woodford Shale Play |
| 11/6/2006 | MarkWest Energy Partners Reports 2006 Third Quarter Results |
| 10/27/2006 | MarkWest Energy Partners Announces Election of Officers |
| 10/25/2006 | MarkWest Energy Partners Declares Cash Distribution |
| 10/16/2006 | MarkWest Energy Partners Announces Private Placement of Senior Notes |
| 9/26/2006 | Newfield Exploration and MarkWest Energy Partners Sign Agreement to Develop Mid-Stream Assets for Woodford Shale Play |
| 8/3/2006 | MarkWest Energy Partners Reports 2006 Second Quarter Results |
| 7/26/2006 | MarkWest Energy Partners Declares Cash Distribution |
| 6/23/2006 | MarkWest Energy Partners Announces Public Offering of Common Units |
| 5/3/2006 | MarkWest Energy Partners Reports 2006 First Quarter Results |
| 4/21/2006 | MarkWest Energy Partners Declares Cash Distribution |
| 1/25/2006 | MarkWest Energy Partners Declares Cash Distribution - Correction |