MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

GREAT LAKES ADVISORS, LLC's Holding History (CIK: 0001078013)

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

Q1 2014
Shares 5,050 Value ($000) $330 Avg Close — Range —
Q4 2013
Shares 5,050 Value ($000) $334 Avg Close — Range —
Q3 2013
Shares 5,050 Value ($000) $365 Avg Close — Range —
Q2 2013
Shares 5,050 Value ($000) $338 Avg Close — Range —