NorthWestern Energy Group, Inc.
US ˙ NasdaqGS ˙ US6680743050

SecurityNWE / NorthWestern Energy Group, Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership1,039 shares
Latest Disclosed Value $ 68,512
Assetmark, Inc reports 0.48% increase in ownership of NWE / NorthWestern Energy Group, Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 1,039 shares of NorthWestern Energy Group, Inc. (US:NWE) valued at $68,512 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 1,034 shares of NorthWestern Energy Group, Inc.. This represents a change in shares of 0.48% during the quarter. The current value of the position is $72,325 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)
2026-05-06 2026-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 1,039 5 0.48 69 3.03 0.0001
2026-01-23 2025-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 1,034 0 0.00 67 10.00 0.0001
2025-11-06 2025-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 1,034 9 0.88 61 15.38 0.0001
2025-08-04 2025-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 1,025 52 5.34 53 -7.14 0.0001
2025-05-06 2025-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 973 0 0.00 56 7.69 0.0002
2025-02-06 2024-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 973 -2 -0.21 52 -5.45 0.0001
2024-11-01 2024-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 975 102 11.68 56 27.91 0.0002
2024-08-13 2024-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 873 0 0.00 44 -2.27 0.0001
2024-05-07 2024-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 873 0 0.00 44 0.00 0.0001
2024-02-09 2023-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 873 0 0.00 44 7.32 0.0002
2023-10-27 2023-09-30 13F NORTHWESTERN COM NEW 668074305 873 0 0.00 42 -16.33 0.0002
2023-08-11 2023-06-30 13F NORTHWESTERN CORP COM COM NEW 668074305 873 0 0.00 50 -2.00 0.0002
2023-05-05 2023-03-31 13F NORTHWESTERN CORP COM COM NEW 668074305 873 0 0.00 51 -1.96 0.0002
2023-02-10 2022-12-31 13F NORTHWESTERN COM NEW 668074305 873 0 0.00 52 18.60 0.0002
2022-11-01 2022-09-30 13F NORTHWESTERN COM NEW 668074305 873 0 0.00 43 -15.69 0.0002
2022-08-03 2022-06-30 13F NORTHWESTERN CORP COM COM NEW 668074305 873 686 366.84 51 363.64 0.0002
2022-05-13 2022-03-31 13F NORTHWESTERN CORP COM COM NEW 668074305 187 -730 -79.61 11 -78.85 0.0000
2022-02-14 2021-12-31 13F NORTHWESTERN CORP COM COM NEW 668074305 917 30 3.38 52 1.96 0.0002
2021-11-12 2021-09-30 13F NORTHWESTERN CORP COM COM 668074305 887 0 0.00 51 -3.77 0.0002
2021-08-16 2021-06-30 13F NORTHWESTERN CORP COM COM 668074305 887 0 0.00 53 -8.62 0.0002
2021-05-14 2021-03-31 13F NORTHWESTERN COM 668074305 887 -19,376 -95.62 58 -95.09 0.0003
2021-02-10 2020-12-31 13F NORTHWESTERN CORP COM COM 668074305 20,263 3,446 20.49 1,182 44.50 0.0066
2020-11-13 2020-09-30 13F NORTHWESTERN CORP COM COM 668074305 16,817 7,564 81.75 818 62.30 0.0053
2020-08-11 2020-06-30 13F NORTHWESTERN CORP COM COM 668074305 9,253 4,767 106.26 504 88.06 0.0036
2020-05-12 2020-03-31 13F NORTHWESTERN CORP COM COM 668074305 4,486 176 4.08 268 -13.27 0.0023
2020-02-11 2019-12-31 13F NORTHWESTERN CORP COM COM 668074305 4,310 1,047 32.09 309 26.12 0.0023
2019-11-13 2019-09-30 13F NORTHWESTERN CORP COM COM 668074305 3,263 -579 -15.07 245 -11.55 0.0021
2019-08-14 2019-06-30 13F NORTHWESTERN CORP COM COM 668074305 3,842 2,463 178.61 277 185.57 0.0023
2019-05-14 2019-03-31 13F NORTHWESTERN CORP COM COM 668074305 1,379 22 1.62 97 19.75 0.0009
2019-02-13 2018-12-31 13F NORTHWESTERN CORP COM COM 668074305 1,357 -256 -15.87 81 -14.74 0.0008
2018-11-13 2018-09-30 13F NORTHWESTERN CORP COM COM 668074305 1,613 -332 -17.07 95 -14.41 0.0009
2018-08-01 2018-06-30 13F NORTHWESTERN CORP COM COM 668074305 1,945 -132 -6.36 111 -0.89 0.0011
2018-05-16 2018-03-31 13F NORTHWESTERN CORP COM COM 668074305 2,077 77 3.85 112 -5.88 0.0012
2018-02-13 2017-12-31 13F NORTHWESTERN CORP COM COM 668074305 2,000 51 2.62 119 7.21 0.0012
2017-11-08 2017-09-30 13F NORTHWESTERN CORP COM COM 668074305 1,949 35 1.83 111 -5.13 0.0013
2017-08-14 2017-06-30 13F NORTHWESTERN CORP COM COM 668074305 1,914 93 5.11 117 9.35 0.0015
2017-09-15 2017-03-31 13F/A-1 NORTHWESTERN CORP COM COM 668074305 1,821 -64 -3.40 107 0.00 0.0014
2017-05-08 2017-03-31 13F NORTHWESTERN CORP COM COM 668074305 1,821 -64 107
2017-09-15 2016-12-31 13F/A-1 NORTHWESTERN CORP COM COM 668074305 1,885 -2 -0.11 107 -1.83 0.0016
2017-02-14 2016-12-31 13F NORTHWESTERN CORP COM COM 668074305 1,885 -2 107
2017-09-14 2016-09-30 13F/A-1 NORTHWESTERN CORP COM COM 668074305 1,887 29 1.56 109 -6.84 0.0017
2016-11-04 2016-09-30 13F NORTHWESTERN CORP COM COM 668074305 1,887 29 109
2017-09-14 2016-06-30 13F/A-1 NORTHWESTERN CORP COM COM 668074305 1,858 1,047 129.10 117 134.00 0.0020
2016-08-08 2016-06-30 13F NORTHWESTERN CORP COM COM 668074305 1,858 1,047 117
2017-09-14 2016-03-31 13F/A-1 NORTHWESTERN CORP COM COM 668074305 811 -4,052 -83.32 50 -81.06 0.0009
2016-05-13 2016-03-31 13F NORTHWESTERN CORP COM COM 668074305 811 -4,052 50
2017-09-14 2015-12-31 13F/A-1 NORTHWESTERN CORP COM COM 668074305 4,863 306 6.71 264 7.76 0.0049
2016-02-12 2015-12-31 13F NORTHWESTERN CORP COM COM 668074305 4,863 306 264
2016-01-05 2015-09-30 13F/A-1 NORTHWESTERN CORP COM COM 668074305 4,557 -10,332 -69.39 245 -66.25 0.0051
2015-11-10 2015-09-30 13F NORTHWESTERN CORP COM COM 668074305 4,557 245
2015-08-13 2015-06-30 13F NORTHWESTERN CORP COM COM 668074305 14,889 -543 -3.52 726 -12.53 0.0151
2015-05-12 2015-03-31 13F NORTHWESTERN CORP COM COM 668074305 15,432 15,432 0.00 830 0.0177
2015-02-03 2014-12-31 13F NORTHWESTERN CORP COM COM 668074305 0 -16,691 -100.00 0 -100.00
2014-11-10 2014-09-30 13F NORTHWESTERN CORP COM COM 668074305 16,691 -863 -4.92 757 -17.36 0.0175
2014-08-12 2014-06-30 13F NORTHWESTERN CORP COM COM 668074305 17,554 250 1.44 916 11.57 0.0195
2014-05-06 2014-03-31 13F NORTHWESTERN CORP COM COM 668074305 17,304 -1,477 -7.86 821 0.86 0.0200
2014-02-11 2013-12-31 13F NORTHWESTERN CORP COM COM 668074305 18,781 1,978 11.77 814 7.81 0.0193
2014-02-11 2013-09-30 13F/A-1 NORTHWESTERN CORP COM COM 668074305 16,803 16,803 755 0.0191
2013-11-14 2013-09-30 13F NORTHWESTERN CORP COM COM 668074305 16,803 755 0.0191
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.