UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report: December 1012, 2013

FIRSTBANK CORPORATION

(Exact Name of Registrant as Specified in Charter)

Michigan 000-14209 38-2633910 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.) 311 Woodworth Avenue Alma, Michigan 48801 (Address of principal executive office) (Zip Code)

Michigan

000-14209

38-2633910

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

311 Woodworth Avenue

Alma, Michigan

48801

(Address of principal executive office)

(Zip Code)

Registrant's telephone number, including area code: (989) 463-3131

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)).

Section 5.07 Submission of Matters to a Vote of Security Holders.

Firstbank Corporation (the "Company") held a special meeting of shareholders on December 12, 2013. At that meeting, the Company's shareholders voted on the matters set forth below:

Proposal 1: Proposal to approve the Agreement and Plan of Merger, dated as of August 14, 2013, between the Company and Mercantile Bank Corporation:

Votes for:			5,623,015
Votes against:			275,187
Abstentions:			62,365
Broker Non-Votes:			0

The Company's shareholders approved Proposal 1.

Proposal 2: Proposal to approve, on an advisory basis, the compensation that may be paid or become payable to the Company's named executive officers that is based on or otherwise related to the proposed merger of the Company and Mercantile Bank Corporation:

Votes for:			4,550,666
Votes against:			1,285,738
Abstentions:			124,164
Broker Non-Votes:			0

The Company's shareholders approved, on an advisory basis, Proposal 2.

Proposal 3: Proposal to approve the adjournment of the Company's special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve Proposal 1:

Votes for:			5,421,313
Votes against:			453,419
Abstentions:			85,836
Broker Non-Votes:			0

There were sufficient votes and the meeting was not adjourned until after Proposal 1 and Proposal 2 had been approved.

Section 7.01 Regulation FD Disclosure.

~~Firstbank~~On ~~Corporation~~December ~~("Firstbank")~~12, ~~will~~2013, ~~broadcast~~the ~~its~~Company ~~previously~~issued ~~announced~~a ~~special~~press ~~shareholder~~release ~~meeting~~announcing bythe ~~telephone~~results ~~conference~~of ~~call.~~the ~~Investors~~special ~~may~~meeting ~~call~~of inshareholders. toA ~~the~~copy ~~meeting~~of onthe apress ~~“listen~~release ~~only”~~is ~~basis~~attached byas ~~dialing~~Exhibit 99.1~~-888-317-6016~~ ~~(toll-free)~~hereto, ~~beginning~~and atis ~~9:30~~incorporated ~~a.m.~~by ~~EST~~reference ~~on Thursday, December 12, 2013~~herein.

~~Section~~The 8information in this Item 7.01 ~~Other~~ ~~Events~~(including the press release) is furnished and shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

~~The~~Section ~~information set forth under Item 7~~9.01 ~~is incorporated herein by reference~~ Exhibits.

(d) Exhibits: The following document is attached as an exhibit to this report on Form 8-K:

99.1 Press Release dated December 12, 2013.

Important Information for Investors

Communications in this Current Report on Form 8-K do not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. ~~The~~Mercantile ~~proposed~~has ~~Merger~~filed ~~and~~a ~~the~~registration ~~issuance~~statement ofon ~~Mercantile~~Form ~~common~~S-4 ~~stock~~(Registration inNo. ~~connection~~333-191212) ~~with~~that ~~the~~includes ~~proposed~~a ~~Merger~~Joint ~~will~~Proxy beStatement ~~submitted~~of to Mercantile’s ~~shareholders for their consideration,~~ and the ~~proposed~~Company ~~Merger~~and ~~will~~also beconstitutes ~~submitted~~a toprospectus ~~Firstbank’s~~of ~~shareholders for their consideration~~Mercantile. InThe ~~connection~~registration ~~therewith~~statement, onas ~~September 17~~amended, ~~2013~~was ~~Mercantile~~declared ~~filed~~effective aby ~~registration~~the ~~statement~~SEC on ~~Form~~November ~~S-4~~6, ~~which~~2013. ~~includes~~The aCompany ~~joint~~and ~~proxy~~Mercantile ~~statement~~mailed tothe bedefinitive ~~used~~Joint byProxy ~~Mercantile~~Statement and ~~Firstbank~~Prospectus to ~~solicit the required approval of~~ their respective shareholders in connection with the ~~proposed~~transaction ~~Merger~~on ~~and~~or ~~which~~about ~~constitutes~~November a7, ~~prospectus of Mercantile~~2013. ~~Mercantile~~The Company and ~~Firstbank~~Mercantile may also file other documents with the SEC concerning the proposed ~~Merger~~merger. INVESTORS AND SECURITY HOLDERS OF ~~MERCANTILE~~THE COMPANY ARE URGED TO READ THE JOINT PROXY STATEMENT AND PROSPECTUS REGARDING THE PROPOSED MERGER AND OTHER RELEVANT DOCUMENTS THAT HAVE BEEN FILED OR ARE TO BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE ~~PROPOSED~~COMPANY, MERCANTILE, THE MERGER AND RELATED MATTERS. Investors and security holders may obtain a free copy of the joint proxy statement and prospectus and other documents containing important information about ~~Mercantile~~the Company and ~~Firstbank~~Mercantile through the website maintained by the SEC at www.sec.gov. Copies of the documents filed with the SEC by ~~Mercantile~~the Company will be available free of charge on ~~Mercantile’~~the Company's website at www.~~mercbank~~firstbankmi.com ~~on the “Investor Relations” page~~. Copies of the documents filed with the SEC by ~~Firstbank~~Mercantile will be available free of charge on ~~Firstbank~~Mercantile’s website at www.~~firstbankmi~~mercbank.com on the “Investor Relations” page.

~~Participants~~Cautionary inStatement ~~the~~Regarding ~~Solicitation~~Forward-Looking Statements

~~Mercantile,~~This ~~Firstbank,~~Current ~~and~~Report ~~certain~~on ofForm ~~their~~8-K ~~respective~~contains ~~directors~~“forward-looking ~~and~~statements” ~~executive~~within ~~officers~~the ~~may~~meaning beof ~~deemed~~Section to27A beof ~~participants in~~ the ~~solicitation~~Securities Act of ~~proxies~~1933 ~~from~~and ~~the~~Section ~~shareholders~~21E of ~~Mercantile~~the Securities and ~~the~~Exchange ~~shareholders~~Act of ~~Firstbank~~1934. inThese ~~connection~~include ~~with~~statements preceded by, followed by or that otherwise include the ~~proposed~~words ~~Merger~~“expects” or similar expressions. ~~Information~~Forward-looking statements relating to expectations about future results or events are based upon information available to the ~~directors~~Company and ~~executive~~Mercantile ~~officers~~as of ~~Mercantile~~today’s isdate ~~set~~and ~~forth~~are innot ~~its~~guarantees ~~proxy~~of ~~statement~~the ~~for~~future ~~its~~performance ~~2013~~of ~~annual~~the ~~meeting~~Company, ofMercantile ~~shareholders~~or the combined company, ~~which~~and ~~was~~actual ~~filed~~results ~~with~~may ~~the~~vary ~~SEC~~materially onfrom ~~March~~the ~~15,~~results ~~2013~~and expectations discussed. ~~Information~~There ~~about~~is no assurance that the ~~directors~~parties ~~and~~will ~~executive~~complete ~~officers~~the proposed merger. Payment of ~~Firstbank~~the iscontemplated ~~set~~special ~~forth~~dividend inis ~~its~~subject ~~proxy~~to ~~statement~~the ~~for~~satisfaction ~~its~~of ~~2013~~the ~~annual~~closing ~~meeting~~conditions ofin ~~shareholders~~the merger agreement, ~~which~~not ~~was~~all ~~filed~~of ~~with~~which are within the ~~SEC~~control onof ~~March~~the ~~15,~~Company ~~2013~~and Mercantile. ~~These~~The ~~documents~~merger ~~can~~agreement may be ~~obtained~~terminated ~~free~~if ofthe ~~charge~~companies ~~from~~do not receive the ~~sources~~necessary ~~indicated~~government ~~above.~~approvals ~~Other~~or ~~information~~if ~~regarding~~either the ~~participants~~Company inor ~~the~~Mercantile ~~proxy~~fails ~~solicitation~~to ~~and~~satisfy aall ~~description~~conditions ofto ~~their~~closing ~~direct~~stated in the merger agreement. Additional risks and ~~indirect~~uncertainties ~~interests,~~related byto ~~security~~the ~~holdings~~proposed ormerger ~~otherwise~~include, ~~will~~but beare ~~contained~~not inlimited to, the ~~joint~~successful ~~proxy~~integration ~~statement~~of the Company's and ~~prospectus~~Mercantile’s businesses and ~~other~~the ~~relevant~~combined ~~materials~~company’s ability to becompete ~~filed~~in ~~with~~ the ~~SEC~~highly ~~when~~competitive ~~they~~banking ~~become~~and ~~available~~financial services industries.

The Company cautions that the foregoing list of risks and uncertainties is not exclusive. Additional information concerning these and other risks is contained in the Company's and Mercantile’s most recently filed Annual Reports on Form 10-K, subsequent Quarterly Reports on Form 10-Q, recent Current Reports on Form 8-K and other SEC filings. The Company undertakes no obligation to publicly update any of these forward-looking statements to reflect events or circumstances that may arise after the date of this Current Report.

SIGNATURE

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.

Dated: December 1012, 2013 FIRSTBANK CORPORATION (Registrant) By: /s/ Samuel G. Stone Samuel G. Stone Executive Vice President and CFO

EXHIBIT INDEX

Exhibit Number		Document

99.1		Press release dated December 12, 2013.

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