MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q3 2015
Shares 110,050 Value ($000) $4,722 Avg Close — Range —
Q2 2015
Shares 94,730 Value ($000) $5,341 Avg Close — Range —
Q1 2015
Shares 121,940 Value ($000) $8,060 Avg Close — Range —
Q4 2014
Shares 137,670 Value ($000) $9,250 Avg Close — Range —
Q3 2014
Shares 76,730 Value ($000) $5,012 Avg Close — Range —
Q2 2014
Shares 54,230 Value ($000) $3,882 Avg Close — Range —
Q1 2014
Shares 76,730 Value ($000) $5,012 Avg Close — Range —
Q4 2013
Shares 76,730 Value ($000) $5,074 Avg Close — Range —
Q3 2013
Shares 79,380 Value ($000) $6,098 Avg Close — Range —
Q2 2013
Shares 102,230 Value ($000) $6,834 Avg Close — Range —