NORTHWESTERN CORP

Ticker: NWE CUSIP: 668074305 Class: EQTY

FIRST MANHATTAN CO. LLC.'s Holding History (CIK: 0000728083)

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

Q4 2025

Shares 85,765 Value ($000) $5,535 Avg Close $62.82 Range $56.07 - $68.56

Q3 2025

Shares 86,449 Value ($000) $5,067 Avg Close $54.14 Range $49.85 - $58.24

Q2 2025

Shares 88,644 Value ($000) $4,547 Avg Close $53.53 Range $49.39 - $57.89

Q1 2025

Shares 93,699 Value ($000) $5,422 Avg Close $52.06 Range $48.49 - $56.12

Q4 2024

Shares 98,295 Value ($000) $5,255 Avg Close $51.38 Range $48.17 - $54.22

Q3 2024

Shares 101,245 Value ($000) $5,793 Avg Close $49.89 Range $45.22 - $54.21

Q2 2024

Shares 107,845 Value ($000) $5,401 Avg Close $46.58 Range $43.68 - $48.79

Q1 2024

Shares 106,945 Value ($000) $5,447 Avg Close $44.40 Range $41.90 - $47.03

Q4 2023

Shares 109,045 Value ($000) $5,549 Avg Close $44.88 Range $41.24 - $48.79

Q3 2023

Shares 121,236 Value ($000) $5,827 Avg Close $47.33 Range $42.66 - $51.72

Q2 2023

Shares 127,582 Value ($000) $7,242 Avg Close $51.34 Range $48.87 - $53.67

Q1 2023

Shares 135,345 Value ($000) $7,831 Avg Close $49.59 Range $46.79 - $52.43

Q4 2022

Shares 145,330 Value ($000) $8,624 Avg Close $46.84 Range $41.72 - $52.07

Q3 2022

Shares 146,330 Value ($000) $7,211 Avg Close $46.61 Range $42.04 - $51.24

Q2 2022

Shares 152,780 Value ($000) $9,003 Avg Close $49.98 Range $45.98 - $52.83

Q1 2022

Shares 341,927 Value ($000) $20,683 Avg Close $48.63 Range $46.08 - $51.75

Q4 2021

Shares 342,512 Value ($000) $19,577 Avg Close $46.70 Range $43.99 - $49.52

Q3 2021

Shares 302,923 Value ($000) $17,357 Avg Close $50.51 Range $46.92 - $53.26

Q2 2021

Shares 303,676 Value ($000) $18,287 Avg Close $52.44 Range $48.13 - $56.92

Q1 2021

Shares 305,726 Value ($000) $19,933 Avg Close $47.20 Range $42.31 - $53.28

Q4 2020

Shares 301,016 Value ($000) $17,552 Avg Close $43.87 Range $37.97 - $49.46

Q3 2020

Shares 271,454 Value ($000) $13,203 Avg Close $41.40 Range $37.35 - $45.52

Q2 2020

Shares 212,511 Value ($000) $11,586 Avg Close $44.67 Range $39.68 - $50.33

Q1 2020

Shares 204,121 Value ($000) $12,212 Avg Close $54.52 Range $34.68 - $61.46

Q4 2019

Shares 206,366 Value ($000) $14,790 Avg Close $54.65 Range $51.50 - $57.67

Q3 2019

Shares 216,211 Value ($000) $16,226 Avg Close $54.27 Range $50.60 - $58.08

Q2 2019

Shares 219,863 Value ($000) $15,863 Avg Close $53.01 Range $50.21 - $55.53

Q1 2019

Shares 224,506 Value ($000) $15,807 Avg Close $48.59 Range $42.38 - $53.49

Q4 2018

Shares 228,744 Value ($000) $13,596 Avg Close $45.03 Range $41.21 - $48.18

Q3 2018

Shares 242,804 Value ($000) $14,242 Avg Close $43.15 Range $40.65 - $45.13

Q2 2018

Shares 286,109 Value ($000) $16,379 Avg Close $39.06 Range $37.03 - $41.93

Q1 2018

Shares 297,147 Value ($000) $15,986 Avg Close $37.69 Range $35.55 - $42.53

Q4 2017

Shares 309,057 Value ($000) $18,450 Avg Close $42.54 Range $39.78 - $45.45

Q3 2017

Shares 311,422 Value ($000) $17,732 Avg Close $41.74 Range $40.09 - $43.18

Q2 2017

Shares 312,497 Value ($000) $19,068 Avg Close $42.35 Range $40.29 - $44.62

Q1 2017

Shares 317,622 Value ($000) $18,644 Avg Close $39.52 Range $38.19 - $41.05

Q4 2016

Shares 320,027 Value ($000) $18,199 Avg Close $38.33 Range $36.64 - $40.23

Q3 2016

Shares 323,448 Value ($000) $18,607 Avg Close $40.31 Range $38.22 - $43.00

Q2 2016

Shares 329,853 Value ($000) $20,803 Avg Close $39.68 Range $37.02 - $42.70

Q1 2016

Shares 329,658 Value ($000) $20,356 Avg Close $38.33 Range $34.60 - $41.62

Q4 2015

Shares 330,658 Value ($000) $17,938 Avg Close $35.84 Range $33.71 - $37.52

Q3 2015

Shares 331,308 Value ($000) $17,834 Avg Close $34.01 Range $31.66 - $36.90

Q2 2015

Shares 332,508 Value ($000) $16,209 Avg Close $33.40 Range $31.54 - $35.25

Q1 2015

Shares 335,913 Value ($000) $18,068 Avg Close $35.30 Range $32.73 - $38.16

Q4 2014

Shares 329,505 Value ($000) $18,643 Avg Close $33.16 Range $28.63 - $37.51

Q3 2014

Shares 336,197 Value ($000) $15,249 Avg Close $30.29 Range $28.46 - $33.15

Q2 2014

Shares 337,397 Value ($000) $17,608 Avg Close $30.04 Range $28.38 - $33.02

Q1 2014

Shares 339,847 Value ($000) $16,118 Avg Close $27.98 Range $26.36 - $29.86

Q4 2013

Shares 409,529 Value ($000) $17,740 Avg Close $27.40 Range $25.54 - $28.91

Q3 2013

Shares 410,985 Value ($000) $18,461 Avg Close $25.46 Range $23.73 - $28.10

Q2 2013

Shares 416,110 Value ($000) $17,630 Avg Close $24.78 Range $23.14 - $25.97

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	85,765	$5,535	$62.82	$56.07 - $68.56
Q3 2025	86,449	$5,067	$54.14	$49.85 - $58.24
Q2 2025	88,644	$4,547	$53.53	$49.39 - $57.89
Q1 2025	93,699	$5,422	$52.06	$48.49 - $56.12
Q4 2024	98,295	$5,255	$51.38	$48.17 - $54.22
Q3 2024	101,245	$5,793	$49.89	$45.22 - $54.21
Q2 2024	107,845	$5,401	$46.58	$43.68 - $48.79
Q1 2024	106,945	$5,447	$44.40	$41.90 - $47.03
Q4 2023	109,045	$5,549	$44.88	$41.24 - $48.79
Q3 2023	121,236	$5,827	$47.33	$42.66 - $51.72
Q2 2023	127,582	$7,242	$51.34	$48.87 - $53.67
Q1 2023	135,345	$7,831	$49.59	$46.79 - $52.43
Q4 2022	145,330	$8,624	$46.84	$41.72 - $52.07
Q3 2022	146,330	$7,211	$46.61	$42.04 - $51.24
Q2 2022	152,780	$9,003	$49.98	$45.98 - $52.83
Q1 2022	341,927	$20,683	$48.63	$46.08 - $51.75
Q4 2021	342,512	$19,577	$46.70	$43.99 - $49.52
Q3 2021	302,923	$17,357	$50.51	$46.92 - $53.26
Q2 2021	303,676	$18,287	$52.44	$48.13 - $56.92
Q1 2021	305,726	$19,933	$47.20	$42.31 - $53.28
Q4 2020	301,016	$17,552	$43.87	$37.97 - $49.46
Q3 2020	271,454	$13,203	$41.40	$37.35 - $45.52
Q2 2020	212,511	$11,586	$44.67	$39.68 - $50.33
Q1 2020	204,121	$12,212	$54.52	$34.68 - $61.46
Q4 2019	206,366	$14,790	$54.65	$51.50 - $57.67
Q3 2019	216,211	$16,226	$54.27	$50.60 - $58.08
Q2 2019	219,863	$15,863	$53.01	$50.21 - $55.53
Q1 2019	224,506	$15,807	$48.59	$42.38 - $53.49
Q4 2018	228,744	$13,596	$45.03	$41.21 - $48.18
Q3 2018	242,804	$14,242	$43.15	$40.65 - $45.13
Q2 2018	286,109	$16,379	$39.06	$37.03 - $41.93
Q1 2018	297,147	$15,986	$37.69	$35.55 - $42.53
Q4 2017	309,057	$18,450	$42.54	$39.78 - $45.45
Q3 2017	311,422	$17,732	$41.74	$40.09 - $43.18
Q2 2017	312,497	$19,068	$42.35	$40.29 - $44.62
Q1 2017	317,622	$18,644	$39.52	$38.19 - $41.05
Q4 2016	320,027	$18,199	$38.33	$36.64 - $40.23
Q3 2016	323,448	$18,607	$40.31	$38.22 - $43.00
Q2 2016	329,853	$20,803	$39.68	$37.02 - $42.70
Q1 2016	329,658	$20,356	$38.33	$34.60 - $41.62
Q4 2015	330,658	$17,938	$35.84	$33.71 - $37.52
Q3 2015	331,308	$17,834	$34.01	$31.66 - $36.90
Q2 2015	332,508	$16,209	$33.40	$31.54 - $35.25
Q1 2015	335,913	$18,068	$35.30	$32.73 - $38.16
Q4 2014	329,505	$18,643	$33.16	$28.63 - $37.51
Q3 2014	336,197	$15,249	$30.29	$28.46 - $33.15
Q2 2014	337,397	$17,608	$30.04	$28.38 - $33.02
Q1 2014	339,847	$16,118	$27.98	$26.36 - $29.86
Q4 2013	409,529	$17,740	$27.40	$25.54 - $28.91
Q3 2013	410,985	$18,461	$25.46	$23.73 - $28.10
Q2 2013	416,110	$17,630	$24.78	$23.14 - $25.97