NorthWestern Energy Group, Inc.
US ˙ NasdaqGS ˙ US6680743050

SecurityNWE / NorthWestern Energy Group, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership2,335,081 shares
Latest Disclosed Value $ 153,975,241
State Street Corp reports 11.47% decrease in ownership of NWE / NorthWestern Energy Group, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 2,335,081 shares of NorthWestern Energy Group, Inc. (US:NWE) valued at $153,975,241 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,637,718 shares of NorthWestern Energy Group, Inc.. This represents a change in shares of -11.47% during the quarter. The current value of the position is $161,494,202 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,335,081 -302,637 -11.47 153,975 -9.55 0.0053
2026-02-13 2025-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,637,718 14,751 0.56 170,238 10.74 0.0057
2025-11-14 2025-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,622,967 28,482 1.10 153,732 15.50 0.0053
2025-08-14 2025-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,594,485 12,530 0.49 133,097 -10.92 0.0050
2025-05-15 2025-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,581,955 25,125 0.98 149,418 9.31 0.0062
2025-02-14 2024-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,556,830 52,430 2.09 136,688 -4.61 0.0054
2024-11-14 2024-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,504,400 42,104 1.71 143,302 16.21 0.0058
2024-08-14 2024-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,462,296 -17,986 -0.73 123,312 -2.38 0.0054
2024-05-15 2024-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,480,282 210,293 9.26 126,321 9.35 0.0056
2024-02-14 2023-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 2,269,989 70,832 3.22 115,520 9.30 0.0056
2023-11-14 2023-09-30 13F NORTHWESTERN COM NEW 668074305 2,199,157 17,389 0.80 105,691 -14.65 0.0059
2023-08-14 2023-06-30 13F NORTHWESTERN COM NEW 668074305 2,181,768 1,226 0.06 123,837 -1.85 0.0065
2023-05-15 2023-03-31 13F NORTHWESTERN COM NEW 668074305 2,180,542 -450,032 -17.11 126,166 -19.18 0.0071
2023-05-15 2022-12-31 13F/A-99 NORTHWESTERN COM NEW 668074305 2,630,574 131,243 5.25 156,098 26.74 0.0092
2023-05-15 2022-12-31 13F NORTHWESTERN COM NEW 668074305 2,630,574 131,243 156,098 0.0092
2022-11-15 2022-09-30 13F NORTHWESTERN COM NEW 668074305 2,499,331 46,229 1.88 123,167 -14.80 0.0078
2022-08-15 2022-06-30 13F NORTHWESTERN COM NEW 668074305 2,453,102 59,449 2.48 144,561 -0.16 0.0087
2022-05-16 2022-03-31 13F NORTHWESTERN COM NEW 668074305 2,393,653 711,238 42.27 144,792 50.56 0.0072
2022-02-14 2021-12-31 13F NORTHWESTERN COM NEW 668074305 1,682,415 68,504 4.24 96,167 3.99 0.0046
2021-11-15 2021-09-30 13F NORTHWESTERN COM NEW 668074305 1,613,911 20,756 1.30 92,477 -3.61 0.0049
2021-08-16 2021-06-30 13F NORTHWESTERN COM NEW 668074305 1,593,155 33,580 2.15 95,940 -5.65 0.0051
2021-07-09 2021-03-31 13F/A-1 NORTHWESTERN COM NEW 668074305 1,559,575 -17,627 -1.12 101,684 10.57 0.0058
2021-05-17 2021-03-31 13F NORTHWESTERN COM NEW 668074305 1,559,575 -17,627 101,684 0.0058
2021-02-16 2020-12-31 13F NORTHWESTERN COM NEW 668074305 1,577,202 5,419 0.34 91,967 20.29 0.0056
2020-11-10 2020-09-30 13F NORTHWESTERN COM NEW 668074305 1,571,783 -97,611 -5.85 76,452 -16.00 0.0052
2020-08-14 2020-06-30 13F NORTHWESTERN COM NEW 668074305 1,669,394 -173,761 -9.43 91,015 -17.47 0.0066
2020-06-19 2020-03-31 13F/A-1 NORTHWESTERN COM NEW 668074305 1,843,155 28,814 1.59 110,276 -15.19 0.0096
2020-05-11 2020-03-31 13F NORTHWESTERN COM NEW 668074305 1,843,155 28,814 110,276 9,684.4532
2020-02-06 2019-12-31 13F NORTHWESTERN COM NEW 668074305 1,814,341 138,445 8.26 130,034 3.39 0.0089
2019-11-14 2019-09-30 13F NORTHWESTERN COM NEW 668074305 1,675,896 -31,784 -1.86 125,776 2.08 0.0094
2019-08-14 2019-06-30 13F NORTHWESTERN COM NEW 668074305 1,707,680 51,131 3.09 123,209 5.63 0.0092
2019-05-15 2019-03-31 13F NORTHWESTERN COM NEW 668074305 1,656,549 -20,441 -1.22 116,638 17.01 0.0091
2019-02-12 2018-12-31 13F NORTHWESTERN COM NEW 668074305 1,676,990 -80,134 -4.56 99,680 -3.30 0.0091
2018-11-09 2018-09-30 13F NORTHWESTERN Common equity shares 668074305 1,757,124 39,554 2.30 103,079 4.82 0.0079
2018-08-14 2018-06-30 13F NORTHWESTERN Common equity shares 668074305 1,717,570 -48,908 -2.77 98,336 3.47 0.0082
2018-05-15 2018-03-31 13F NORTHWESTERN Common equity shares 668074305 1,766,478 -44,807 -2.47 95,035 -12.11 0.0081
2018-02-14 2017-12-31 13F NORTHWESTERN Common equity shares 668074305 1,811,285 35,567 2.00 108,134 6.94 0.0087
2017-11-14 2017-09-30 13F NORTHWESTERN Common equity shares 668074305 1,775,718 -23,928 -1.33 101,112 -7.92 0.0087
2017-08-14 2017-06-30 13F NORTHWESTERN Common equity shares 668074305 1,799,646 118,101 7.02 109,811 11.25 0.0097
2017-05-15 2017-03-31 13F NORTHWESTERN Common equity shares 668074305 1,681,545 69,473 4.31 98,705 7.66 0.0088
2017-02-09 2016-12-31 13F NORTHWESTERN Common equity shares 668074305 1,612,072 -2,957 -0.18 91,684 -1.32 0.0086
2017-01-13 2016-09-30 13F/A-1 NORTHWESTERN Common equity shares 668074305 1,615,029 533,615 49.34 92,914 36.22 0.0094
2016-11-14 2016-09-30 13F NORTHWESTERN Common equity shares 668074305 1,615,029 92,914
2016-08-12 2016-06-30 13F NORTHWESTERN Common equity shares 668074305 1,081,414 39,316 3.77 68,207 5.99 0.0073
2016-05-20 2016-03-31 13F/A-1 NORTHWESTERN Common equity shares 668074305 1,042,098 4,415 0.43 64,354 14.31 0.0070
2016-05-12 2016-03-31 13F NORTHWESTERN Common equity shares 668074305 1,042,098 64,354
2016-02-16 2015-12-31 13F NORTHWESTERN Common equity shares 668074305 1,037,683 7,615 0.74 56,297 1.53 0.0062
2015-11-16 2015-09-30 13F NORTHWESTERN Common equity shares 668074305 1,030,068 -38,477 -3.60 55,449 6.44 0.0065
2015-08-13 2015-06-30 13F NORTHWESTERN Common equity shares 668074305 1,068,545 -30,263 -2.75 52,093 -11.86 0.0056
2015-05-15 2015-03-31 13F NORTHWESTERN Common equity shares 668074305 1,098,808 52,606 5.03 59,104 -0.15 0.0061
2015-02-11 2014-12-31 13F NORTHWESTERN Common equity shares 668074305 1,046,202 120,835 13.06 59,192 41.03 0.0059
2014-11-12 2014-09-30 13F/A-1 NORTHWESTERN Common equity shares 668074305 925,367 -11,035 -1.18 41,972 -14.12 0.0045
2014-11-10 2014-09-30 13F NORTHWESTERN Common equity shares 668074305 925,367 41,972
2014-08-12 2014-06-30 13F NORTHWESTERN Common equity shares 668074305 936,402 -4,787 -0.51 48,873 9.47 0.0053
2014-05-15 2014-03-31 13F/A-1 NORTHWESTERN Common equity shares 668074305 941,189 -7,900 -0.83 44,644 8.58 0.0051
2014-05-13 2014-03-31 13F NORTHWESTERN Common equity shares 668074305 941,189 44,644
2014-02-06 2013-12-31 13F/A-1 NORTHWESTERN Common equity shares 668074305 949,089 4,218 0.45 41,117 -3.13 0.0046
2014-02-06 2013-12-31 13F NORTHWESTERN Common equity shares 668074305 912,680 31,698
2013-11-12 2013-09-30 13F NORTHWESTERN Common equity shares 668074305 944,871 12,208 1.31 42,447 14.04 0.0052
2013-08-08 2013-06-30 13F NORTHWESTERN Common equity shares 668074305 932,663 932,663 37,220 0.0049
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.