MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q3 2015
Shares 28,984 Value ($000) $1,244 Avg Close — Range —
Q2 2015
Shares 28,383 Value ($000) $1,600 Avg Close — Range —
Q1 2015
Shares 20,332 Value ($000) $1,344 Avg Close — Range —
Q4 2014
Shares 20,852 Value ($000) $1,401 Avg Close — Range —
Q3 2014
Shares 11,355 Value ($000) $872 Avg Close — Range —
Q2 2014
Shares 11,330 Value ($000) $811 Avg Close — Range —
Q1 2014
Shares 11,330 Value ($000) $740 Avg Close — Range —
Q4 2013
Shares 11,330 Value ($000) $749 Avg Close — Range —
Q3 2013
Shares 12,413 Value ($000) $897 Avg Close — Range —