NorthWestern Energy Group, Inc.
US ˙ NasdaqGS ˙ US6680743050

SecurityNWE / NorthWestern Energy Group, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership738,638 shares
Latest Disclosed Value $ 48,705,790
Citigroup Inc reports 53.05% increase in ownership of NWE / NorthWestern Energy Group, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 738,638 shares of NorthWestern Energy Group, Inc. (US:NWE) valued at $48,705,790 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 482,614 shares of NorthWestern Energy Group, Inc.. This represents a change in shares of 53.05% during the quarter. The current value of the position is $51,084,204 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)
2026-05-11 2026-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 738,638 256,024 53.05 48,706 56.37 0.0105
2026-02-13 2025-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 482,614 52,253 12.14 31,148 23.49 0.0137
2025-11-10 2025-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 430,361 397,544 1,211.40 25,223 1,398.69 0.0112
2025-08-11 2025-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 32,817 -23,786 -42.02 1,684 -48.61 0.0008
2025-05-12 2025-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 56,603 -8,482 -13.03 3,276 -5.86 0.0017
2025-02-12 2024-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 65,085 7,756 13.53 3,479 6.07 0.0021
2024-11-12 2024-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 57,329 39,572 222.85 3,280 268.95 0.0019
2024-08-12 2024-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 17,757 2,913 19.62 889 17.59 0.0006
2024-05-10 2024-03-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 14,844 -12,673 -46.06 756 -46.00 0.0005
2024-02-09 2023-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 27,517 23,552 594.00 1,400 636.84 0.0010
2023-12-06 2023-09-30 13F/A-1 NORTHWESTERN COM NEW 668074305 3,965 -21,152 -84.21 191 -86.67 0.0001
2023-11-09 2023-09-30 13F NORTHWESTERN COM NEW 668074305 3,965 -21,152 191 0.0001
2023-08-10 2023-06-30 13F NORTHWESTERN COM NEW 668074305 25,117 18,287 267.75 1,426 260.76 0.0009
2023-05-11 2023-03-31 13F NORTHWESTERN COM NEW 668074305 6,830 -424 -5.85 395 -8.14 0.0003
2023-02-09 2022-12-31 13F NORTHWESTERN COM NEW 668074305 7,254 -7,739 -51.62 430 -41.81 0.0003
2022-11-10 2022-09-30 13F NORTHWESTERN COM NEW 668074305 14,993 7,566 101.87 739 69.11 0.0005
2022-08-10 2022-06-30 13F NORTHWESTERN COM NEW 668074305 7,427 1,312 21.46 437 18.43 0.0003
2022-05-12 2022-03-31 13F NORTHWESTERN COM NEW 668074305 6,115 -12,896 -67.83 369 -66.05 0.0002
2022-02-10 2021-12-31 13F NORTHWESTERN COM NEW 668074305 19,011 10,239 116.72 1,087 116.10 0.0006
2021-11-10 2021-09-30 13F NORTHWESTERN COM NEW 668074305 8,772 3,033 52.85 503 45.80 0.0003
2021-08-10 2021-06-30 13F NORTHWESTERN COM NEW 668074305 5,739 3 0.05 345 -7.75 0.0002
2021-05-13 2021-03-31 13F NORTHWESTERN COM NEW 668074305 5,736 -9,766 -63.00 374 -58.58 0.0002
2021-02-11 2020-12-31 13F NORTHWESTERN COM NEW 668074305 15,502 9,658 165.26 903 217.96 0.0005
2020-11-12 2020-09-30 13F NORTHWESTERN COM NEW 668074305 5,844 -12,378 -67.93 284 -71.40 0.0002
2020-08-12 2020-06-30 13F NORTHWESTERN COM NEW 668074305 18,222 -1,292 -6.62 993 -14.98 0.0008
2020-05-12 2020-03-31 13F NORTHWESTERN COM NEW 668074305 19,514 4,009 25.86 1,168 5.23 0.0011
2020-02-12 2019-12-31 13F NORTHWESTERN COM NEW 668074305 15,505 7,252 87.87 1,110 79.03 0.0008
2019-11-08 2019-09-30 13F NORTHWESTERN COM NEW 668074305 8,253 -2,292 -21.74 620 -18.64 0.0005
2019-08-12 2019-06-30 13F NORTHWESTERN COM NEW 668074305 10,545 -22,160 -67.76 762 -66.91 0.0006
2019-05-13 2019-03-31 13F NORTHWESTERN COM NEW 668074305 32,705 -1,646 -4.79 2,303 12.78 0.0022
2019-02-12 2018-12-31 13F NORTHWESTERN COM NEW 668074305 34,351 -988 -2.80 2,042 -1.50 0.0021
2018-11-13 2018-09-30 13F NORTHWESTERN COM NEW 668074305 35,339 -2,073 -5.54 2,073 -3.22 0.0018
2018-08-10 2018-06-30 13F NORTHWESTERN COM NEW 668074305 37,412 -11,516 -23.54 2,142 -18.62 0.0020
2018-05-11 2018-03-31 13F NORTHWESTERN COM NEW 668074305 48,928 38,463 367.54 2,632 321.12 0.0022
2018-02-12 2017-12-31 13F NORTHWESTERN COM NEW 668074305 10,465 3,145 42.96 625 49.88 0.0005
2017-11-13 2017-09-30 13F NORTHWESTERN COM NEW 668074305 7,320 2,402 48.84 417 39.00 0.0003
2017-08-11 2017-06-30 13F NORTHWESTERN COM NEW 668074305 4,918 -4,353 -46.95 300 -44.85 0.0003
2017-05-12 2017-03-31 13F NORTHWESTERN COM NEW 668074305 9,271 -50,757 -84.56 544 -84.07 0.0005
2017-02-10 2016-12-31 13F NORTHWESTERN COM NEW 668074305 60,028 36,792 158.34 3,414 155.35 0.0031
2016-11-10 2016-09-30 13F NORTHWESTERN COM NEW 668074305 23,236 -3,350 -12.60 1,337 -20.27 0.0012
2016-08-12 2016-06-30 13F NORTHWESTERN COM NEW 668074305 26,586 -22,327 -45.65 1,677 -44.49 0.0017
2016-05-13 2016-03-31 13F NORTHWESTERN COM NEW 668074305 48,913 26,228 115.62 3,021 145.61 0.0034
2016-02-12 2015-12-31 13F NORTHWESTERN COM NEW 668074305 22,685 17,180 312.08 1,230 314.14 0.0012
2015-11-13 2015-09-30 13F NORTHWESTERN COM NEW 668074305 5,505 4,128 299.78 297 343.28 0.0003
2015-08-13 2015-06-30 13F NORTHWESTERN COM NEW 668074305 1,377 -17,533 -92.72 67 -93.41 0.0001
2015-05-14 2015-03-31 13F NORTHWESTERN COM NEW 668074305 18,910 -20,866 -52.46 1,017 -54.80 0.0010
2015-02-17 2014-12-31 13F NORTHWESTERN COM NEW 668074305 39,776 22,350 128.26 2,250 184.45 0.0020
2014-11-14 2014-09-30 13F NORTHWESTERN COM NEW 668074305 17,426 1,801 11.53 791 -3.06 0.0007
2014-08-14 2014-06-30 13F NORTHWESTERN COM NEW 668074305 15,625 -11,400 -42.18 816 -36.35 0.0008
2014-05-15 2014-03-31 13F NORTHWESTERN COM NEW 668074305 27,025 -9,304 -25.61 1,282 -18.50 0.0013
2014-02-14 2013-12-31 13F NORTHWESTERN COM NEW 668074305 36,329 13,370 58.23 1,573 52.57 0.0014
2013-11-14 2013-09-30 13F NORTHWESTERN COM NEW 668074305 22,959 1,250 5.76 1,031 19.05 0.0010
2013-08-14 2013-06-30 13F NORTHWESTERN COM NEW 668074305 21,709 21,709 866 0.0009
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.