Donald C. Heppermann is Director at MARKWEST ENERGY PARTNERS L P (MWE). They have made 3 open-market trades across 2 companies since 2006, most recently 2015-12-04.
CIK 0001235073
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
2 open-market purchases totalling $40K since 2009, against 1 sale. Too few scored purchases to measure a record yet.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.