NorthWestern Energy Group, Inc.
US ˙ NasdaqGS ˙ US6680743050

SecurityNWE / NorthWestern Energy Group, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership76,104 shares
Latest Disclosed Value $ 5,015,254
Janus Henderson Group Plc reports 29.20% increase in ownership of NWE / NorthWestern Energy Group, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 76,104 shares of NorthWestern Energy Group, Inc. (US:NWE) valued at $5,018,298 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 58,904 shares of NorthWestern Energy Group, Inc.. This represents a change in shares of 29.20% during the quarter. The current value of the position is $5,297,599 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)
2026-05-18 2026-03-31 13F/A-1 NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 76,104 17,200 29.20 5,015 31.90 0.0008
2026-05-15 2026-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 76,104 17,200 29.20 5,015 31.90 0.0009
2026-02-17 2025-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 58,904 31,990 118.86 3,802 141.09 0.0017
2025-11-14 2025-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 0 0.00 1,578 14.28 0.0007
2025-08-14 2025-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 0 0.00 1,381 -9.69 0.0007
2025-05-15 2025-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 0 0.00 1,528 6.26 0.0008
2025-02-14 2024-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 0 0.00 1,439 -6.56 0.0007
2024-11-14 2024-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 0 0.00 1,540 14.17 0.0008
2024-08-14 2024-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 26,914 -316 -1.16 1,349 -2.74 0.0007
2024-05-15 2024-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 27,230 0 0.00 1,386 0.07 0.0008
2024-02-14 2023-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 27,230 -39 -0.14 1,385 5.73 0.0008
2023-11-14 2023-09-30 13F NORTHWESTERN COM NEW 668074305 27,269 3 0.01 1,310 -15.32 0.0009
2023-08-14 2023-06-30 13F NORTHWESTERN COM NEW 668074305 27,266 -17 -0.06 1,547 -1.90 0.0010
2023-05-15 2023-03-31 13F NORTHWESTERN COM NEW 668074305 27,283 19,015 229.98 1,578 221.84 0.0010
2023-02-14 2022-12-31 13F NORTHWESTERN COM NEW 668074305 8,268 0 0.00 491 20.10 0.0004
2022-11-14 2022-09-30 13F NORTHWESTERN COM NEW 668074305 8,268 -2,013 -19.58 408 -32.67 0.0003
2022-08-15 2022-06-30 13F NORTHWESTERN COM NEW 668074305 10,281 -17 -0.17 606 -2.57 0.0004
2022-05-16 2022-03-31 13F NORTHWESTERN COM NEW 668074305 10,298 16 0.16 622 5.96 0.0003
2022-02-14 2021-12-31 13F NORTHWESTERN COM NEW 668074305 10,282 5,174 101.29 587 100.34 0.0002
2021-11-16 2021-09-30 13F NORTHWESTERN COM NEW 668074305 5,108 -295,838 -98.30 293 -98.38 0.0001
2021-08-16 2021-06-30 13F NORTHWESTERN COM NEW 668074305 300,946 -264,505 -46.78 18,123 -50.84 0.0078
2021-05-17 2021-03-31 13F NORTHWESTERN COM NEW 668074305 565,451 45,482 8.75 36,867 21.60 0.0168
2021-02-16 2020-12-31 13F NORTHWESTERN COM NEW 668074305 519,969 32,819 6.74 30,319 27.96 0.0141
2020-11-16 2020-09-30 13F NORTHWESTERN COM NEW 668074305 487,150 154,376 46.39 23,695 30.60 0.0124
2020-08-14 2020-06-30 13F NORTHWESTERN COM NEW 668074305 332,774 -9,158 -2.68 18,143 -11.32 0.0102
2020-05-14 2020-03-31 13F NORTHWESTERN COM NEW 668074305 341,932 -102,584 -23.08 20,458 -35.78 0.0141
2020-02-18 2019-12-31 13F NORTHWESTERN COM NEW 668074305 444,516 0 0.00 31,858 -4.51 0.0163
2019-11-14 2019-09-30 13F NORTHWESTERN COM NEW 668074305 444,516 -140,316 -23.99 33,361 -20.94 0.0181
2019-07-31 2019-06-30 13F NORTHWESTERN COM NEW 668074305 584,832 -111,978 -16.07 42,196 -13.99 0.0230
2019-04-30 2019-03-31 13F NORTHWESTERN COM NEW 668074305 696,810 -74,741 -9.69 49,062 6.98 0.0272
2019-02-06 2018-12-31 13F NORTHWESTERN COM NEW 668074305 771,551 -53,338 -6.47 45,861 -5.22 0.0292
2018-11-09 2018-09-30 13F NORTHWESTERN COM NEW 668074305 824,889 0 0.00 48,388 2.46 0.0259
2018-08-10 2018-06-30 13F NORTHWESTERN COM NEW 668074305 824,889 -235,242 -22.19 47,225 -17.20 0.0269
2018-05-14 2018-03-31 13F NORTHWESTERN COM NEW 668074305 1,060,131 144 0.01 57,035 -9.87 0.0336
2018-03-12 2017-12-31 13F/A-1 NORTHWESTERN COM NEW 668074305 1,059,987 248,412 30.61 63,281 36.94 0.0390
2018-02-09 2017-12-31 13F NORTHWESTERN COM NEW 668074305 1,059,987 248,412 63,281
2017-11-14 2017-09-30 13F NORTHWESTERN COM NEW 668074305 811,575 209,765 34.86 46,211 25.84 0.0296
2017-08-17 2017-06-30 13F/A-1 NORTHWESTERN COM NEW 668074305 601,810 601,810 36,722 0.0250
2017-08-14 2017-06-30 13F NORTHWESTERN COM NEW 668074305 601,810 36,722 0.0251
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.