NorthWestern Energy Group, Inc.
US ˙ NasdaqGS ˙ US6680743050

SecurityNWE / NorthWestern Energy Group, Inc.
InstitutionD. E. Shaw & Co., Inc.
ManagerDE Shaw
Latest Disclosed Ownership176,557 shares
Latest Disclosed Value $ 11,642,169
D. E. Shaw & Co., Inc. reports 1,096.92% increase in ownership of NWE / NorthWestern Energy Group, Inc.

On May 15, 2026 - D. E. Shaw & Co., Inc. filed a 13F-HR form disclosing ownership of 176,557 shares of NorthWestern Energy Group, Inc. (US:NWE) valued at $11,642,169 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 14,751 shares of NorthWestern Energy Group, Inc.. This represents a change in shares of 1,096.92% during the quarter. The current value of the position is $12,210,682 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 176,557 161,806 1,096.92 11,642 1,122.90 0.0070
2026-02-17 2025-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 14,751 14,751 952 0.0005
2025-11-14 2025-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 0 -7,950 -100.00 0 -100.00
2025-08-14 2025-06-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 7,950 7,950 408 0.0003
2025-02-14 2024-12-31 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 0 -16,034 -100.00 0 -100.00
2024-11-14 2024-09-30 13F NORTHWESTERN ENERGY GROUP IN COM NEW 668074305 16,034 16,034 917 0.0008
2024-11-14 2023-12-31 13F/A-1 NORTHWESTERN COM NEW 668074305 0 -11,409 -100.00 0 -100.00
2024-02-14 2023-12-31 13F NORTHWESTERN COM NEW 668074305 0 -11,409 0
2023-11-14 2023-09-30 13F NORTHWESTERN COM NEW 668074305 11,409 11,409 548 0.0006
2023-08-14 2023-06-30 13F NORTHWESTERN COM NEW 668074305 0 -9,449 -100.00 0 -100.00
2023-05-15 2023-03-31 13F NORTHWESTERN COM NEW 668074305 9,449 9,449 547 0.0006
2023-02-14 2022-12-31 13F NORTHWESTERN COM NEW 668074305 0 -30,602 -100.00 0 -100.00
2022-11-14 2022-09-30 13F NORTHWESTERN COM NEW 668074305 30,602 30,602 1,508 0.0018
2021-05-17 2021-03-31 13F NORTHWESTERN COM NEW 668074305 0 -51,196 -100.00 0 -100.00
2021-02-16 2020-12-31 13F NORTHWESTERN COM NEW 668074305 51,196 -54,978 -51.78 2,985 -42.20 0.0027
2020-11-16 2020-09-30 13F NORTHWESTERN COM NEW 668074305 106,174 77,278 267.43 5,164 227.87 0.0053
2020-08-14 2020-06-30 13F NORTHWESTERN COM NEW 668074305 28,896 28,896 1,575 0.0019
2018-08-14 2018-06-30 13F NORTHWESTERN COM NEW 668074305 0 -8,149 -100.00 0 -100.00
2018-05-15 2018-03-31 13F NORTHWESTERN COM NEW 668074305 8,149 -17,237 -67.90 438 -71.11 0.0006
2018-02-14 2017-12-31 13F NORTHWESTERN COM NEW 668074305 25,386 -43,423 -63.11 1,516 -61.31 0.0021
2017-11-14 2017-09-30 13F NORTHWESTERN COM NEW 668074305 68,809 47,885 228.85 3,918 206.81 0.0060
2017-08-14 2017-06-30 13F NORTHWESTERN COM NEW 668074305 20,924 -43,848 -67.70 1,277 -66.41 0.0021
2017-05-15 2017-03-31 13F NORTHWESTERN COM NEW 668074305 64,772 5,586 9.44 3,802 12.95 0.0067
2017-02-14 2016-12-31 13F NORTHWESTERN COM NEW 668074305 59,186 20,956 54.82 3,366 53.07 0.0057
2016-11-14 2016-09-30 13F NORTHWESTERN COM NEW 668074305 38,230 -10,945 -22.26 2,199 -29.11 0.0039
2016-08-15 2016-06-30 13F NORTHWESTERN COM NEW 668074305 49,175 -33,897 -40.80 3,102 -39.53 0.0057
2016-05-16 2016-03-31 13F NORTHWESTERN COM NEW 668074305 83,072 46,107 124.73 5,130 155.86 0.0092
2016-02-16 2015-12-31 13F NORTHWESTERN COM NEW 668074305 36,965 29,786 414.90 2,005 419.43 0.0030
2015-11-16 2015-09-30 13F NORTHWESTERN COM NEW 668074305 7,179 7,179 0.00 386 0.0006
2015-08-14 2015-06-30 13F NORTHWESTERN COM NEW 668074305 0 -11,794 -100.00 0 -100.00
2015-05-15 2015-03-31 13F NORTHWESTERN COM NEW 668074305 11,794 -19,477 -62.28 634 -64.16 0.0010
2015-02-17 2014-12-31 13F NORTHWESTERN COM NEW 668074305 31,271 -29,199 -48.29 1,769 -35.51 0.0023
2014-11-14 2014-09-30 13F NORTHWESTERN COM NEW 668074305 60,470 -10,437 -14.72 2,743 -25.88 0.0036
2014-08-14 2014-06-30 13F NORTHWESTERN COM NEW 668074305 70,907 -24,313 -25.53 3,701 -18.07 0.0050
2014-05-15 2014-03-31 13F NORTHWESTERN COM NEW 668074305 95,220 -7,941 -7.70 4,517 1.07 0.0064
2014-02-14 2013-12-31 13F NORTHWESTERN COM NEW 668074305 103,161 -110,203 -51.65 4,469 -53.38 0.0061
2013-11-20 2013-09-30 13F/A-1 NORTHWESTERN COM NEW 668074305 213,364 76,722 56.15 9,585 75.81 0.0153
2013-11-14 2013-09-30 13F NORTHWESTERN COM NEW 668074305 213,364 9,585
2013-08-14 2013-06-30 13F NORTHWESTERN COM NEW 668074305 136,642 136,642 5,452 0.0103
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.