INDEPENDENCE CONTRACT DRIL I

CUSIP: 453415309 Class: COM

WELLINGTON MANAGEMENT GROUP LLP's Holding History (CIK: 0000902219)

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

Q1 2017
Shares 411,007 Value ($000) $2,264 Avg Close — Range —
Q4 2016
Shares 1,028,008 Value ($000) $6,887 Avg Close — Range —
Q3 2016
Shares 900,997 Value ($000) $4,730 Avg Close — Range —