MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

DAVIS R M INC's Holding History (CIK: 0000891287)

Note: Option positions (PUT/CALL) are excluded.

Q4 2014
Shares 3,000 Value ($000) $202 Avg Close — Range —
Q3 2014
Shares 3,000 Value ($000) $230 Avg Close — Range —
Q2 2014
Shares 3,000 Value ($000) $215 Avg Close — Range —
Q4 2013
Shares 3,445 Value ($000) $228 Avg Close — Range —
Q3 2013
Shares 3,000 Value ($000) $217 Avg Close — Range —