Sec Form 4 Filing - Padilla Julie L @ ALLETE INC - 2025-12-15

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Padilla Julie L 2. Issuer Name and Ticker or Trading Symbol ALLETE INC [ ALE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) VP, Ch Legal Offcr & Secretary (Last) (First) (Middle) 30 WEST SUPERIOR STREET 3. Date of Earliest Transaction (MM/DD/YY) 12/15/2025 (Street) DULUTH, MN55802 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/15/2025 D 2,096.47 ( 1 ) ( 2 ) D 0 D Common Stock 12/15/2025 D 210.2 ( 4 ) D $ 67 ( 1 ) 0 I By RSOP Trust

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Padilla Julie L 30 WEST SUPERIOR STREET DULUTH, MN55802 VP, Ch Legal Offcr & Secretary Signatures Julie L. Padilla 12/16/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the terms of that certain Agreement and Plan of Merger ("Merger Agreement"), dated as of May 5, 2024, by and among ALLETE, Inc., a Minnesota corporation (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"), at the effective time on December 15, 2025 (the "Effective Time"), Merger Sub merged with and into the Company, with the Company surviving such merger (the "Merger") as a subsidiary of Parent. In connection with the Merger, each share of Company common stock, no par value ("Common Stock"), was automatically converted into the right to receive $67.00 in cash per share without interest (the "Merger Consideration"). The disposition of the securities by the Reporting Person in the Merger was approved by the Company's board of directors in the manner contemplated by Rule 16b-3 under the Securities Exchange Act of 1934, as amended. ( 2 )Includes shares acquired in exempt transactions under the dividend equivalent feature of restricted stock unit ("RSU") grants pursuant to the Company's executive long-term incentive compensation plan, based on plan information available as of immediately prior to the Effective Time. ( 3 )Pursuant to the Merger Agreement, each RSU with respect to Common Stock that was outstanding and unvested immediately prior to the Effective Time was canceled as of the Effective Time and converted into a contingent right to receive a converted cash award with respect to an aggregate amount, without interest, equal in value to (x) the number of shares of Common Stock subject to such RSU immediately prior to the Effective Time after giving effect to the accumulation of dividend equivalents credited in respect of such RSU, multiplied by (y) the Merger Consideration, subject to deduction for any applicable withholding taxes. Each such converted cash award will continue to have, and payment will be subject to, the same terms and conditions, including vesting conditions, as applied to the corresponding RSU immediately prior to the Effective Time. ( 4 )Includes shares acquired in exempt transactions pursuant to the Company's retirement savings and stock ownership plan ("RSOP"), based on RSOP plan information available as of immediately prior to the Effective Time.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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