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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): May 27, 2026

NorthWestern Energy Group, Inc.
(Exact name of registrant as specified in its charter)

Delaware | 000-56598 | 93-2020320
(State or other jurisdiction of incorporation or organization) | (Commission File Number) | (I.R.S. Employer Identification No.)
3010 W. 69th Street | Sioux Falls | South Dakota |  | 57108
(Address of principal executive offices) |  | (Zip Code)

Registrant’s telephone number, including area code: 605-978-2900
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:

Registrant | Title of each class | Trading Symbol(s) | Name of each exchange on which registered
NorthWestern Energy Group, Inc. | Common stock | NWE | Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging Growth Company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
☐

Item 7.01 Regulation FD Disclosure.
On May 27, 2026, Crystal Lail, vice president and chief financial officer, and Travis Meyer, director corporate development and investor relations officer, of NorthWestern Energy Group, Inc. d/b/a NorthWestern Energy (Nasdaq: NWE) (the “Company”) will be attending the Bank of America Power, Utilities & Cleantech Conference in New York. On June 2, 2026, Ms. Lail and Mr. Meyer will be in Boston and will be joined by Emilie Ng, the Company's treasurer, as part of a non-deal roadshow organized by BMO, and on June 4, 2026, these three Company representatives will be participating in the Mizuho Mid-Cap Utilities Conference in New York. In connection with these conferences and meetings, they will be providing certain information concerning the Company in a slide presentation to current and potential investors and will be affirming the Company's 2026 non-GAAP earnings guidance range of $3.68 to $3.83 per diluted share.
A copy of the presentation is being furnished pursuant to Regulation FD as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in the presentation will not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Furthermore, the presentation will not be deemed to be incorporated by reference into the Company's filings under the Securities Act of 1933, as amended, or under the Securities Exchange Act of 1934, as amended, except as set forth with respect thereto in any such filing.
Item 9.01 Financial Statements and Exhibits.

Exhibit No. |  | Description of Document
99.1* |  | Company Presentation, dated May 27, 2026
104 |  | Cover Page Interactive Data File – the cover page XBRL tags are embedded within the Inline XBRL document
* filed herewith

Signatures
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

|  | NorthWestern Energy Group, Inc. |
| By: | /s/ Timothy P. Olson |
|  | Timothy P. Olson |
|  | Corporate Secretary |

Date: May 27, 2026