MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

Stockbridge Partners LLC's Holding History (CIK: 0001505183)

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

Q3 2015
Shares 2,578,159 Value ($000) $110,629 Avg Close — Range —
Q2 2015
Shares 3,160,086 Value ($000) $178,166 Avg Close — Range —
Q1 2015
Shares 3,165,918 Value ($000) $209,267 Avg Close — Range —
Q4 2014
Shares 3,016,718 Value ($000) $202,693 Avg Close — Range —
Q3 2014
Shares 2,789,306 Value ($000) $214,274 Avg Close — Range —
Q2 2014
Shares 2,369,354 Value ($000) $169,598 Avg Close — Range —
Q1 2014
Shares 1,831,695 Value ($000) $119,646 Avg Close — Range —