NORTHWESTERN CORP

CUSIP: 66807430 Class: COM NEW

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q1 2016
Shares 51,810 Value ($000) $3,199 Avg Close — Range —
Q1 2014
Shares 7,955 Value ($000) $377 Avg Close — Range —