INDEPENDENCE CONTRACT DRIL I

CUSIP: 453415309 Class: COM

CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT's Holding History (CIK: 0001329375)

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

Q3 2017
Shares 104,013 Value ($000) $396 Avg Close — Range —
Q2 2017
Shares 104,013 Value ($000) $405 Avg Close — Range —
Q1 2017
Shares 104,013 Value ($000) $574 Avg Close — Range —
Q4 2016
Shares 669,273 Value ($000) $4,484 Avg Close — Range —
Q3 2016
Shares 799,372 Value ($000) $4,197 Avg Close — Range —
Q2 2016
Shares 303,365 Value ($000) $1,648 Avg Close — Range —
Q4 2014
Shares 118,085 Value ($000) $616 Avg Close — Range —
Q3 2014
Shares 118,085 Value ($000) $1,387 Avg Close — Range —