# EDGAR Filing Document

**Accession Number:** 0000066756
**File Stem:** 0001140361-25-045242
**Filing Date:** 2025-12
**Character Count:** 17627
**Document Hash:** 5de9abfc430396269b35d597d8ba9c53
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-045242.hdr.sgml**: 20251211

**ACCESSION NUMBER**: 0001140361-25-045242

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20251210

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251211

**DATE AS OF CHANGE**: 20251211

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ALLETE INC
- **CENTRAL INDEX KEY:** 0000066756
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 410418150
- **STATE OF INCORPORATION:** MN
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03548
- **FILM NUMBER:** 251564585

**BUSINESS ADDRESS:**
- **STREET 1:** 30 W SUPERIOR ST
- **CITY:** DULUTH
- **STATE:** MN
- **ZIP:** 55802-2093
- **BUSINESS PHONE:** 2182795000

**MAIL ADDRESS:**
- **STREET 1:** 30 W SUPERIOR STREET
- **CITY:** DULUTH
- **STATE:** MN
- **ZIP:** 55802-2093

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLETE
- **DATE OF NAME CHANGE:** 20000901

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MINNESOTA POWER INC
- **DATE OF NAME CHANGE:** 19980603

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MINNESOTA POWER & LIGHT CO
- **DATE OF NAME CHANGE:** 19920703

?xml version='1.0' encoding='ASCII'?

------

#### 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) **–** December 10, 2025

#### ALLETE, Inc.
(Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Minnesota**<br>| **1-3548**<br>| **41-0418150**<br>|
| (State or other jurisdiction of incorporation or organization) | (Commission File Number) | (IRS Employer Identification No.) |

---

#### 30 West Superior Street

#### Duluth , Minnesota 55802-2093
(Address of principal executive offices, including zip code)

(218) 279-5000

(Registrant's telephone number, including area code)

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:

☐ 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))

Title of each class Trading symbol Name of each exchange on which registered <br> Common Stock, without par value ALE New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company 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. ☐

------

#### SECTION 7 – REGULATION FD

---

| | |
|:---|:---|
|  **Item 7.01** | **Regulation FD Disclosure.** |

---

On December 11, 2025, ALLETE, Inc. (the "Company") issued a press release announcing that the Company has reviewed the final written order from the Minnesota Public Utilities Commission (the "MPUC") approving the Merger (as defined below) and that the Company expects the Merger to close on or about December 15, 2025, subject to the satisfaction or waiver of the remaining closing conditions. The press release is attached to this report as Exhibit 99.1 and is incorporated herein by reference.

The press release is being furnished, not filed, pursuant to Regulation FD. Accordingly, the press release will not be incorporated by reference into any registration statement filed by the Company under the Securities Act of 1933, as amended (the "Securities Act"), unless specifically identified therein as being incorporated therein by reference. The furnishing of the press release is not intended to, and does not, constitute a determination or admission by the Company that the information in the press release is material or complete, or that investors should consider this information before making an investment decision with respect to any security of the Company or any of its affiliates.

#### SECTION 8 – OTHER EVENTS

---

| | |
|:---|:---|
|  **Item 8.01** | **Other Events.** |

---

*MPUC Final Written Order and Expected Closing Date* 

As previously announced, on May 5, 2024, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") by and among the Company, Alloy Parent LLC, a Delaware limited liability company ("Parent"), and Alloy Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the Merger Agreement, on the terms and subject to the conditions set forth therein, Merger Sub will merge with and into the Company (the "Merger"), with the Company continuing as the surviving corporation in the Merger and becoming a subsidiary of Parent.

On October 3, 2025, the MPUC held a public hearing in which the MPUC voted in favor of approval of the Merger. A final written order approving the Merger was issued by the MPUC on December 10, 2025.

The Company's shareholders previously approved the Merger, and the Company previously received all other regulatory approvals and consents required to consummate the Merger.

The Company expects the Merger to close on or about December 15, 2025, subject to satisfaction or waiver of the remaining conditions to the closing of the Merger in accordance with the Merger Agreement (the "Closing"). There can be no assurance that the closing of the Merger will occur on the expected timeline. As a result of the Closing, shares of common stock, without par value, of the Company (the "Common Stock") will cease to be listed for trading on the New York Stock Exchange.

*Stub Period Dividend*

As previously disclosed, the board of directors of the Company (the "Board") fixed October 16, 2025, as the record date for the Stub Period Dividend (defined below), provided holders of Common Stock hold their shares to the Closing. The Company expects that prior to the Closing, the Board will declare a Stub Period Dividend as allowed by the terms and provisions of the Merger Agreement. The Company expects that the dividend, as and when declared by the Board, will be in an amount equal to $0.008 per share of Common Stock (which reflects the most recent regular quarterly dividend rate of $0.73 per share, divided by 91 days) multiplied by the number of days from and including August 16, 2025, the day after the record date for the most recent regular quarterly Common Stock dividend, to and including the Closing (the "Stub Period Dividend"). The Company expects that the Stub Period Dividend, as and when declared by the Board, will be payable to all holders of Common Stock who also receive the Merger Consideration (as defined in the Merger Agreement).

#### SECTION 9 – FINANCIAL STATEMENTS AND EXHIBITS

---

| | |
|:---|:---|
|  **Item 9.01** | **Financial Statements and Exhibits.** |

---

(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit** | Description |
| [99.1](ef20060783_ex99-1.htm) | Press Release, dated December 11, 2025 |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

*Readers are cautioned that forward-looking statements should be read in conjunction with disclosures under the heading: "Forward-Looking Statements" located on page 2 of this Current Report on Form 8-K.*

ALLETE, Inc. Form 8-K dated December 11, 2025

------

#### Forward-Looking Statements
This Form 8-K contains "forward-looking statements" within the meaning of the federal securities laws, including safe harbor provisions of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding the proposed acquisition of the Company, payment or timing of dividends, if any, regulatory approvals, the expected timetable for completing the proposed transaction and any other statements regarding the Company's future expectations, beliefs, plans, objectives, financial conditions, assumptions or future events or performance that are not historical facts. This information may involve risks and uncertainties that could cause actual results to differ materially from such forward-looking statements. These risks and uncertainties include, but are not limited to: the timing to consummate the proposed transaction; the risk that the conditions to closing of the proposed transaction may not be satisfied; the risk that a regulatory approval that may be required for the proposed transaction is not obtained or is obtained subject to conditions that are not anticipated; the outcome of any legal proceedings, regulatory proceedings, or enforcement matters that may be instituted against the Company and others relating to the merger agreement; and the diversion of management's time on transaction-related issues.

When used in this Form 8-K, or any other documents, words such as "anticipate," "believe," "estimate," "expect," "forecast," "target," "could," "goal," "intend," "objective," "plan," "project," "seek," "strategy," "target," "may," "will" and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based on the beliefs and assumptions of management at the time that these statements were prepared and are inherently uncertain. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied in the forward-looking statements. These risks and uncertainties, as well as other risks and uncertainties that could cause the Company's actual results to differ materially from those expressed in the forward looking statements, are described in greater detail under the heading "Item 1A. Risk Factors" in the Company's Form 10-Q for the quarter ended September 30, 2025, the Company's Form 10-K for the year ended December 31, 2024 and in subsequently filed Forms 10-Q and 8-K, and in any other SEC filings made by the Company. Management cautions against putting undue reliance on forward-looking statements or projecting any future results based on such statements or present or prior earnings levels. Forward-looking statements speak only as of the date hereof, and the Company does not undertake any obligation to update or supplement any forward-looking statements to reflect actual results, new information, future events, changes in its expectations or other circumstances that exist after the date as of which the forward-looking statements were made.

ALLETE, Inc. Form 8-K dated December 11, 2025

------

#### 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 thereunto duly authorized.

---

| | |
|:---|:---|
| **ALLETE, Inc.** | **ALLETE, Inc.** |
| December 11, 2025 | /s/ Julie L. Padilla |
|  | Julie L. Padilla |
|  | Vice President, Chief Legal Officer and Corporate Secretary |

---

ALLETE, Inc. Form 8-K dated December 11, 2025

------

## Exhibit 99.1

------

#### Exhibit 99.1<br>

---

| | | |
|:---|:---|:---|
| ![](image00003.jpg) | **FOR RELEASE:** <br>| December 11, 2025 |
| ![](image00003.jpg) |  |  |
| ![](image00003.jpg) | **MEDIA CONTACT:** | Amy Rutledge<br> Director, Corporate Communications <br>(218) 723-7400<br> arutledge@allete.com |
| ![](image00003.jpg) |  | Amy Rutledge<br> Director, Corporate Communications <br>(218) 723-7400<br> arutledge@allete.com |
| ![](image00003.jpg) |  | Amy Rutledge<br> Director, Corporate Communications <br>(218) 723-7400<br> arutledge@allete.com |
| ![](image00003.jpg) |  | Amy Rutledge<br> Director, Corporate Communications <br>(218) 723-7400<br> arutledge@allete.com |

---

------

#### <br>

#### ALLETE receives written order from MPUC approving acquisition by CPP Investments and Global Infrastructure Partners, closing expected Dec. 15

DULUTH, Minn. - ALLETE, Inc. (NYSE: ALE) (the Company) today announced that it has reviewed the written order from the Minnesota Public Utilities Commission (MPUC) approving the company's acquisition by Canada Pension Plan Investment Board (CPP Investments) and Global Infrastructure Partners (GIP), two leading global investors in infrastructure and sustainable energy.

The acquisition, which is expected to close on or about Dec. 15, subject to the satisfaction or waiver of the remaining closing conditions, aligns with ALLETE's strategy to support a stronger, more flexible electric grid and other clean-energy transition investments while safeguarding reliability and reasonable rates for customers. Approximately $200 million in historic benefits are expected to be delivered to Minnesota Power customers and the regional economy through bill credits, assistance with past-due bills, and economic development opportunities as a result of the acquisition.

ALLETE Chair, President and CEO Bethany Owen said the acquisition by GIP and CPP Investments will strengthen ALLETE's ability to invest in regional transmission infrastructure and renewable and other clean-energy technologies and meet Minnesota's energy and environmental goals, including a carbon-free energy supply by 2040. ALLETE remains committed to ensuring these investments enhance reliability while keeping bills as low as possible for customers.

The acquisition has also been approved by ALLETE shareholders and federal and state agencies, including the Federal Energy Regulatory Commission and the Public Service Commission of Wisconsin. As a result of the acquisition, shares of ALLETE common stock will cease to be listed for trading on the New York Stock Exchange.

#### About ALLETE, Inc.
ALLETE, Inc. is an energy company headquartered in Duluth, Minnesota. ALLETE is committed to providing sustainable energy solutions to its customers and communities while delivering value to all of its stakeholders. The company's businesses include Minnesota Power and Superior Water Light and Power, both regulated public utilities; ALLETE Clean Energy, a developer and operator of renewable energy projects; BNI Energy, which provides energy solutions in North Dakota; and New Energy Equity, headquartered in Annapolis, Maryland. ALLETE also has an 8% equity interest in the American Transmission Co. More information about ALLETE is available at www.allete.com. *ALE-CORP*

![](image00008.jpg)<br>

------

#### About CPP Investments
Canada Pension Plan Investment Board (CPP Investments™) is a professional investment management organization that manages the Canada Pension Plan Fund in the best interest of the more than 22 million contributors and beneficiaries. In order to build diversified portfolios of assets, CPP Investments makes investments around the world in public equities, private equities, real estate, infrastructure, fixed income, and alternative strategies including in partnership with funds. Headquartered in Toronto, with offices in Hong Kong, London, Mumbai, New York City, San Francisco, São Paulo, and Sydney, CPP Investments is governed and managed independently of the Canada Pension Plan and at arm's length from governments. On September 30, 2025, the Fund totaled C$777.5 billion. For more information, please visit www.cppinvestments.com or follow us on LinkedIn, Instagram or on X @CPPInvestments.

#### Global Infrastructure Partners
Global Infrastructure Partners (GIP), a part of BlackRock, is a leading infrastructure investor that specializes in investing in, owning and operating some of the largest and most complex assets across the energy, transport, digital infrastructure and water and waste management sectors. With energy pragmatism central to its investment thesis, GIP is well positioned to support the global energy transition.

GIP's scaled platform has over $189 billion in assets under management. GIP's focus on real infrastructure assets, combined with its deep proprietary origination network and comprehensive operational expertise, enables GIP to be responsible stewards of its clients' capital and to create positive economic impact for communities. For more information, visit www.global-infra.com.

Forward-Looking Statements

This press release contains forward-looking statements regarding the anticipated closing of the acquisition and its expected benefits. These statements are based on current expectations and assumptions and are subject to risks and uncertainties that could cause actual results to differ materially. For a discussion of factors that could impact ALLETE's performance, please refer to the company's filings with the Securities and Exchange Commission.

*ALLETE calculates and reports carbon emissions based on the GHG Protocol. Details in ALLETE's <u>Corporate Sustainability Report</u>.*

###

![](image00008.jpg)

------