NORTHWESTERN CORP

Ticker: NWE CUSIP: 668074305 Class: EQTY

NISA INVESTMENT ADVISORS, LLC's Holding History (CIK: 0000937615)

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

Q4 2025

Shares 49,566 Value ($000) $3,199 Avg Close $62.82 Range $56.07 - $68.56

Q3 2025

Shares 46,390 Value ($000) $2,719 Avg Close $54.14 Range $49.85 - $58.24

Q2 2025

Shares 52,152 Value ($000) $2,675 Avg Close $53.53 Range $49.39 - $57.89

Q1 2025

Shares 46,177 Value ($000) $2,672 Avg Close $52.06 Range $48.49 - $56.12

Q4 2024

Shares 51,180 Value ($000) $2,736 Avg Close $51.38 Range $48.17 - $54.22

Q3 2024

Shares 50,926 Value ($000) $2,914 Avg Close $49.89 Range $45.22 - $54.21

Q2 2024

Shares 28,142 Value ($000) $1,409 Avg Close $46.58 Range $43.68 - $48.79

Q1 2024

Shares 21,733 Value ($000) $1,107 Avg Close $44.40 Range $41.90 - $47.03

Q4 2023

Shares 28,033 Value ($000) $1,427 Avg Close $44.88 Range $41.24 - $48.79

Q3 2023

Shares 31,977 Value ($000) $1,537 Avg Close $47.33 Range $42.66 - $51.72

Q2 2023

Shares 53,122 Value ($000) $3,015 Avg Close $51.34 Range $48.87 - $53.67

Q1 2023

Shares 50,062 Value ($000) $3 Avg Close $49.59 Range $46.79 - $52.43

Q4 2022

Shares 54,215 Value ($000) $3 Avg Close $46.84 Range $41.72 - $52.07

Q3 2022

Shares 44,215 Value ($000) $2,179 Avg Close $46.61 Range $42.04 - $51.24

Q2 2022

Shares 55,090 Value ($000) $3,246 Avg Close $49.98 Range $45.98 - $52.83

Q1 2022

Shares 52,626 Value ($000) $3,183 Avg Close $48.63 Range $46.08 - $51.75

Q4 2021

Shares 52,746 Value ($000) $3,066 Avg Close $46.70 Range $43.99 - $49.52

Q3 2021

Shares 56,496 Value ($000) $3,237 Avg Close $50.51 Range $46.92 - $53.26

Q2 2021

Shares 35,496 Value ($000) $2,138 Avg Close $52.44 Range $48.13 - $56.92

Q1 2021

Shares 75,496 Value ($000) $4,922 Avg Close $47.20 Range $42.31 - $53.28

Q4 2020

Shares 77,296 Value ($000) $4,507 Avg Close $43.87 Range $37.97 - $49.46

Q3 2020

Shares 75,596 Value ($000) $3,677 Avg Close $41.40 Range $37.35 - $45.52

Q2 2020

Shares 69,146 Value ($000) $3,770 Avg Close $44.67 Range $39.68 - $50.33

Q1 2020

Shares 75,696 Value ($000) $4,529 Avg Close $54.52 Range $34.68 - $61.46

Q4 2019

Shares 68,456 Value ($000) $4,906 Avg Close $54.65 Range $51.50 - $57.67

Q3 2019

Shares 66,956 Value ($000) $5,025 Avg Close $54.27 Range $50.60 - $58.08

Q2 2019

Shares 67,125 Value ($000) $4,843 Avg Close $53.01 Range $50.21 - $55.53

Q1 2019

Shares 67,125 Value ($000) $4,726 Avg Close $48.59 Range $42.38 - $53.49

Q4 2018

Shares 64,725 Value ($000) $3,847 Avg Close $45.03 Range $41.21 - $48.18

Q3 2018

Shares 66,525 Value ($000) $3,902 Avg Close $43.15 Range $40.65 - $45.13

Q2 2018

Shares 70,115 Value ($000) $4,014 Avg Close $39.06 Range $37.03 - $41.93

Q1 2018

Shares 67,965 Value ($000) $3,620 Avg Close $37.69 Range $35.55 - $42.53

Q4 2017

Shares 77,565 Value ($000) $4,631 Avg Close $42.54 Range $39.78 - $45.45

Q3 2017

Shares 84,565 Value ($000) $4,815 Avg Close $41.74 Range $40.09 - $43.18

Q2 2017

Shares 87,965 Value ($000) $5,383 Avg Close $42.35 Range $40.29 - $44.62

Q1 2017

Shares 94,565 Value ($000) $5,551 Avg Close $39.52 Range $38.19 - $41.05

Q4 2016

Shares 88,340 Value ($000) $5,024 Avg Close $38.33 Range $36.64 - $40.23

Q3 2016

Shares 92,440 Value ($000) $5,318 Avg Close $40.31 Range $38.22 - $43.00

Q2 2016

Shares 84,090 Value ($000) $5,304 Avg Close $39.68 Range $37.02 - $42.70

Q1 2016

Shares 83,640 Value ($000) $5,165 Avg Close $38.33 Range $34.60 - $41.62

Q4 2015

Shares 83,640 Value ($000) $4,537 Avg Close $35.84 Range $33.71 - $37.52

Q3 2015

Shares 83,640 Value ($000) $4,494 Avg Close $34.01 Range $31.66 - $36.90

Q2 2015

Shares 83,640 Value ($000) $4,077 Avg Close $33.40 Range $31.54 - $35.25

Q1 2015

Shares 62,060 Value ($000) $3,338 Avg Close $35.30 Range $32.73 - $38.16

Q4 2014

Shares 60,340 Value ($000) $3,414 Avg Close $33.16 Range $28.63 - $37.51

Q3 2014

Shares 55,100 Value ($000) $2,499 Avg Close $30.29 Range $28.46 - $33.15

Q2 2014

Shares 52,300 Value ($000) $2,730 Avg Close $30.04 Range $28.38 - $33.02

Q1 2014

Shares 48,300 Value ($000) $2,291 Avg Close $27.98 Range $26.36 - $29.86

Q4 2013

Shares 42,800 Value ($000) $1,854 Avg Close $27.40 Range $25.54 - $28.91

Q3 2013

Shares 41,700 Value ($000) $1,873 Avg Close $25.46 Range $23.73 - $28.10

Q2 2013

Shares 34,800 Value ($000) $1,389 Avg Close $24.78 Range $23.14 - $25.97

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	49,566	$3,199	$62.82	$56.07 - $68.56
Q3 2025	46,390	$2,719	$54.14	$49.85 - $58.24
Q2 2025	52,152	$2,675	$53.53	$49.39 - $57.89
Q1 2025	46,177	$2,672	$52.06	$48.49 - $56.12
Q4 2024	51,180	$2,736	$51.38	$48.17 - $54.22
Q3 2024	50,926	$2,914	$49.89	$45.22 - $54.21
Q2 2024	28,142	$1,409	$46.58	$43.68 - $48.79
Q1 2024	21,733	$1,107	$44.40	$41.90 - $47.03
Q4 2023	28,033	$1,427	$44.88	$41.24 - $48.79
Q3 2023	31,977	$1,537	$47.33	$42.66 - $51.72
Q2 2023	53,122	$3,015	$51.34	$48.87 - $53.67
Q1 2023	50,062	$3	$49.59	$46.79 - $52.43
Q4 2022	54,215	$3	$46.84	$41.72 - $52.07
Q3 2022	44,215	$2,179	$46.61	$42.04 - $51.24
Q2 2022	55,090	$3,246	$49.98	$45.98 - $52.83
Q1 2022	52,626	$3,183	$48.63	$46.08 - $51.75
Q4 2021	52,746	$3,066	$46.70	$43.99 - $49.52
Q3 2021	56,496	$3,237	$50.51	$46.92 - $53.26
Q2 2021	35,496	$2,138	$52.44	$48.13 - $56.92
Q1 2021	75,496	$4,922	$47.20	$42.31 - $53.28
Q4 2020	77,296	$4,507	$43.87	$37.97 - $49.46
Q3 2020	75,596	$3,677	$41.40	$37.35 - $45.52
Q2 2020	69,146	$3,770	$44.67	$39.68 - $50.33
Q1 2020	75,696	$4,529	$54.52	$34.68 - $61.46
Q4 2019	68,456	$4,906	$54.65	$51.50 - $57.67
Q3 2019	66,956	$5,025	$54.27	$50.60 - $58.08
Q2 2019	67,125	$4,843	$53.01	$50.21 - $55.53
Q1 2019	67,125	$4,726	$48.59	$42.38 - $53.49
Q4 2018	64,725	$3,847	$45.03	$41.21 - $48.18
Q3 2018	66,525	$3,902	$43.15	$40.65 - $45.13
Q2 2018	70,115	$4,014	$39.06	$37.03 - $41.93
Q1 2018	67,965	$3,620	$37.69	$35.55 - $42.53
Q4 2017	77,565	$4,631	$42.54	$39.78 - $45.45
Q3 2017	84,565	$4,815	$41.74	$40.09 - $43.18
Q2 2017	87,965	$5,383	$42.35	$40.29 - $44.62
Q1 2017	94,565	$5,551	$39.52	$38.19 - $41.05
Q4 2016	88,340	$5,024	$38.33	$36.64 - $40.23
Q3 2016	92,440	$5,318	$40.31	$38.22 - $43.00
Q2 2016	84,090	$5,304	$39.68	$37.02 - $42.70
Q1 2016	83,640	$5,165	$38.33	$34.60 - $41.62
Q4 2015	83,640	$4,537	$35.84	$33.71 - $37.52
Q3 2015	83,640	$4,494	$34.01	$31.66 - $36.90
Q2 2015	83,640	$4,077	$33.40	$31.54 - $35.25
Q1 2015	62,060	$3,338	$35.30	$32.73 - $38.16
Q4 2014	60,340	$3,414	$33.16	$28.63 - $37.51
Q3 2014	55,100	$2,499	$30.29	$28.46 - $33.15
Q2 2014	52,300	$2,730	$30.04	$28.38 - $33.02
Q1 2014	48,300	$2,291	$27.98	$26.36 - $29.86
Q4 2013	42,800	$1,854	$27.40	$25.54 - $28.91
Q3 2013	41,700	$1,873	$25.46	$23.73 - $28.10
Q2 2013	34,800	$1,389	$24.78	$23.14 - $25.97