[Updated May 20, 2013.] Gross insider activity in MWE stock has totaled $1 million over the past 30 days, composed entirely of disposals. On a net basis, insiders have been net sellers of Markwest Energy Partners lp shares in the past 30 days, to the tune of $1 million, or 0.0112% of the company's market capitalization. This compares to monthly averages of $657,981 and $607,859 for gross and net insider activity, respectively, over the past year.

The last reported insider transaction was filed on May 01, when C. Corwin Bromley, an officer of the firm sold a net 10,000 shares worth a total of $619,448.

MWE does business in the Energy sector. Industry peers include Enbridge Energy (EEP), Subsea 7 Sa (SUBC), and Cheniere Energy Partners lp (CQP).Activity in Markwest Energy Partners lp shares is extremely high as a share of market capitalization relative to sector peers that have also experienced insider activity in the past 30 days. This is consistent with relative activity measured over the past 12 months.

Markwest Energy Partners lp operates in the Oil & Gas Drilling & Exploration sub-sector, and competes with firms such as Concho Resources (CXO), Diamond Offshore Drilling (DO) and Noble Corporation (NE). Activity in Markwest Energy Partners lp shares is extremely high as a share of market capitalization relative to sector peers that have also experienced insider activity in the past 30 days. This is consistent with relative activity measured over the past 12 months.