NORTHWESTERN CORP

Ticker: NWE CUSIP: 668074305 Class: EQTY

Artisan Partners Limited Partnership's Holding History (CIK: 0001466153)

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

Q2 2015

Shares 65,199 Value ($000) $3,178 Avg Close $33.40 Range $31.54 - $35.25

Q1 2015

Shares 78,199 Value ($000) $4,206 Avg Close $35.30 Range $32.73 - $38.16

Q4 2014

Shares 124,704 Value ($000) $7,056 Avg Close $33.16 Range $28.63 - $37.51

Q3 2014

Shares 105,246 Value ($000) $4,774 Avg Close $30.29 Range $28.46 - $33.15

Q2 2014

Shares 101,556 Value ($000) $5,300 Avg Close $30.04 Range $28.38 - $33.02

Q1 2014

Shares 97,600 Value ($000) $4,629 Avg Close $27.98 Range $26.36 - $29.86

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	65,199	$3,178	$33.40	$31.54 - $35.25
Q1 2015	78,199	$4,206	$35.30	$32.73 - $38.16
Q4 2014	124,704	$7,056	$33.16	$28.63 - $37.51
Q3 2014	105,246	$4,774	$30.29	$28.46 - $33.15
Q2 2014	101,556	$5,300	$30.04	$28.38 - $33.02
Q1 2014	97,600	$4,629	$27.98	$26.36 - $29.86