MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

Heronetta Management, L.P.'s Holding History (CIK: 0001588225)

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

Q3 2015
Shares 159,720 Value ($000) $6,854 Avg Close — Range —
Q2 2015
Shares 159,720 Value ($000) $9,005 Avg Close — Range —
Q1 2015
Shares 159,720 Value ($000) $10,557 Avg Close — Range —
Q4 2014
Shares 156,720 Value ($000) $10,530 Avg Close — Range —
Q3 2014
Shares 155,720 Value ($000) $11,962 Avg Close — Range —
Q2 2014
Shares 152,720 Value ($000) $10,932 Avg Close — Range —
Q1 2014
Shares 145,720 Value ($000) $9,518 Avg Close — Range —
Q4 2013
Shares 143,720 Value ($000) $9,504 Avg Close — Range —
Q3 2013
Shares 140,520 Value ($000) $10,149 Avg Close — Range —
Q2 2013
Shares 137,020 Value ($000) $9,083 Avg Close — Range —
Q1 2013
Shares 135,720 Value ($000) $8,245 Avg Close — Range —
Q4 2012
Shares 138,700 Value ($000) $7,075 Avg Close — Range —