Sec Form 4 Filing - Deering Jesse A @ MACKINAC FINANCIAL CORP /MI/ - 2021-09-03

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 Deering Jesse A 2. Issuer Name and Ticker or Trading Symbol MACKINAC FINANCIAL CORP /MI/ [ MFNC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP and CFO (Last) (First) (Middle) 260 EAST BROWN ST., SUITE 300 3. Date of Earliest Transaction (MM/DD/YY) 09/03/2021 (Street) BIRMINGHAM, MI48009 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 09/03/2021 D 30,288 D 0 D

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 Deering Jesse A 260 EAST BROWN ST. SUITE 300 BIRMINGHAM, MI48009 EVP and CFO Signatures /s/ Jeffrey H. Kuras, by Power of Attorney 09/08/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On September 3, 2021, pursuant to the Agreement and Plan of Merger ("Merger Agreement") dated as of April 12, 2021, by and between Nicolet Bankshares, Inc. ("Nicolet") and Mackinac Financial Corporation ("MFNC"), MFNC merged with and into Nicolet ("Merger"), and each outstanding share of MFNC common stock was converted into the right to receive 0.22 of a share of Nicolet common stock, with cash payable in lieu of a fractional share in an amount equal to the fraction of a share of Nicolet common stock which the holder would otherwise be entitled to receive multiplied by $4.64. In connection with the Merger, the reporting person has the right to receive, in exchange for all of the MFNC common stock reported in Table I, an aggregate of 6,663 shares of Nicolet common stock having a market value of $76.74 per share on the effective date of the Merger, and cash in lieu of a fractional share of Nicolet common stock, subject to any required tax withholding under applicable law. ( 2 )Pursuant to the Merger Agreement, the amount of securities disposed of includes MFNC restricted shares. At the effective time of the Merger, any vesting conditions applicable to outstanding restricted share awards under MFNC's equity incentive plans automatically accelerated in full and such restricted shares converted into, and will be exchanged for, the merger consideration as described in note (1) above, less any applicable taxes required to be withheld with respect to such vesting.

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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