MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

FORT WASHINGTON INVESTMENT ADVISORS INC /OH/'s Holding History (CIK: 0001009016)

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

Q3 2015
Shares 291,100 Value ($000) $12,491 Avg Close — Range —
Q2 2015
Shares 320,563 Value ($000) $18,073 Avg Close — Range —
Q1 2015
Shares 445,666 Value ($000) $29,459 Avg Close — Range —
Q4 2014
Shares 448,966 Value ($000) $30,166 Avg Close — Range —
Q3 2014
Shares 444,466 Value ($000) $34,144 Avg Close — Range —
Q2 2014
Shares 686,558 Value ($000) $49,144 Avg Close — Range —
Q1 2014
Shares 679,858 Value ($000) $44,408 Avg Close — Range —
Q4 2013
Shares 234,700 Value ($000) $15,521 Avg Close — Range —
Q3 2013
Shares 193,900 Value ($000) $14,005 Avg Close — Range —
Q2 2013
Shares 162,400 Value ($000) $10,856 Avg Close — Range —