MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

COMERICA BANK's Holding History (CIK: 0000901541)

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

Q3 2013
Shares 17,524 Value ($000) $1,266 Avg Close — Range —
Q2 2013
Shares 17,356 Value ($000) $1,161 Avg Close — Range —