MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

BALDWIN BROTHERS LLC/MA's Holding History (CIK: 0001021258)

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

Q3 2015
Shares 15,803 Value ($000) $678 Avg Close — Range —
Q2 2015
Shares 16,653 Value ($000) $939 Avg Close — Range —
Q1 2015
Shares 16,553 Value ($000) $1,094 Avg Close — Range —
Q4 2014
Shares 27,898 Value ($000) $1,874 Avg Close — Range —
Q3 2014
Shares 27,193 Value ($000) $2,089 Avg Close — Range —
Q2 2014
Shares 26,697 Value ($000) $1,911 Avg Close — Range —
Q1 2014
Shares 26,697 Value ($000) $1,744 Avg Close — Range —
Q4 2013
Shares 22,742 Value ($000) $1,504 Avg Close — Range —
Q3 2013
Shares 24,792 Value ($000) $1,791 Avg Close — Range —
Q2 2013
Shares 25,075 Value ($000) $1,676 Avg Close — Range —