MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

STEPHENS INC /AR/'s Holding History (CIK: 0000757657)

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

Q3 2015
Shares 63,294 Value ($000) $2,716 Avg Close — Range —
Q2 2015
Shares 65,652 Value ($000) $3,701 Avg Close — Range —
Q1 2015
Shares 78,125 Value ($000) $5,164 Avg Close — Range —
Q4 2014
Shares 35,194 Value ($000) $2,365 Avg Close — Range —
Q3 2014
Shares 29,686 Value ($000) $2,280 Avg Close — Range —
Q2 2014
Shares 23,707 Value ($000) $1,697 Avg Close — Range —
Q1 2014
Shares 23,382 Value ($000) $1,527 Avg Close — Range —
Q4 2013
Shares 21,737 Value ($000) $1,437 Avg Close — Range —
Q3 2013
Shares 29,465 Value ($000) $2,128 Avg Close — Range —
Q2 2013
Shares 27,870 Value ($000) $1,863 Avg Close — Range —