FORM 8-A/A


                     U.S. SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

                     PURSUANT TO SECTION 12(b) OR (g) OF THE

                         SECURITIES EXCHANGE ACT OF 1934


                           MERCANTILE BANK CORPORATION

             (Exact name of registrant as specified in its charter)

                MICHIGAN                                 38-3360865
(State of incorporation or organization)    (I.R.S. Employer Identification No.)

               310 LEONARD STREET NW, GRAND RAPIDS, MICHIGAN 49504
               (Address of Principal Executive Offices) (Zip Code)

Securities to be registered pursuant to Section 12(b) of the Act:

          Title of each class                 Name of each exchange on which
          to be so registered                 each class is to be registered

            None

         If this form relates to the registration of a class of securities
pursuant to Section 12(b) of the Exchange Act and is effective pursuant to
General Instruction A.(c), check the following box. [ ]

         If this form relates to the registration of a class of securities
pursuant to Section 12(g) of the Exchange Act and is effective pursuant to
General Instruction A.(d), check the following box. [X]

         Securities Act registration statement file number to which this form
relates: ......... if applicable.

         Securities to be registered pursuant to Section 12(g) of the Act:

                                  COMMON STOCK
--------------------------------------------------------------------------------
                                (Title of Class)





EXPLANATORY NOTE.

         This amendment is intended to update the disclosures included in the
Form 8-A, dated July 9, 1999, that Mercantile Bank Corporation ("Mercantile")
filed with the Securities and Exchange Commission on July 15, 1999 to register
its common stock under Section 12(g) of the Securities Exchange Act of 1934.

ITEM 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         The authorized capital stock of Mercantile Bank Corporation
("Mercantile") consists of 20,000,000 shares of common stock and 1,000,000
shares of preferred stock. As of November 8, 2005, there were 7,589,278 shares
of common stock issued and outstanding. No shares of preferred stock have been
issued by Mercantile.

         Michigan law allows Mercantile's Board of Directors to issue additional
shares of stock up to the total amount of common stock and preferred stock
authorized without obtaining the prior approval of the shareholders.

PREFERRED STOCK

         Mercantile's Board of Directors is authorized to issue preferred stock,
in one or more series, from time to time, with such voting powers, full or
limited but not to exceed one vote per share, or without voting powers, and with
such designations, preferences and relative, participating, optional or other
special rights, and qualifications, limitation or restrictions, as may be
provided in the resolution or resolutions adopted by the Board of Directors. The
authority of the Board of Directors includes, but is not limited to, the
determination or fixing of the following with respect to shares of such class or
any series:

   o   the number of shares and designation of the series;

   o   the dividend rate and whether dividends are to be cumulative;

   o   whether shares are to be redeemable, and, if so, whether redeemable for
       cash, property or rights;

   o   the rights to which the holders of shares will be entitled, and the
       preferences, if any, over any other series;

   o   whether the shares will be subject to the operation of a purchase,
       retirement or sinking fund, and, if so, upon what conditions;

   o   whether the shares will be convertible into or exchangeable for shares of
       any other class or of any other series of any class of capital stock and
       the terms and conditions of such conversion or exchange;


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   o   the voting powers, full or limited, if any, of the shares;

   o   whether the issuance of any additional shares, or of any shares of any
       other series, will be subject to restrictions as to issuance, or as to
       the powers, preferences or rights of any other series; and

   o   any other preferences, privileges and powers and relative, participating,
       optional or other special rights and qualifications, limitations or
       restrictions.

COMMON STOCK

         Dividend Rights

         Subject to any prior rights of any holders of preferred stock then
outstanding, the holders of the common stock will be entitled to dividends when,
as and if declared by Mercantile's Board of Directors out of funds legally
available for dividends. Under Michigan law, dividends may be legally declared
or paid only if after the distribution Mercantile can pay its debts as they come
due in the usual course of business, and Mercantile's total assets equal or
exceed the sum of its liabilities plus the amount that would be needed to
satisfy the preferential rights upon dissolution of any holders of preferred
stock then outstanding whose preferential rights are superior to those receiving
the distribution.

         Funds for the payment of dividends by Mercantile are expected to be
obtained primarily from dividends from one or more of its subsidiaries. There
can be no assurance that Mercantile will have funds available for dividends, or
that if funds are available, that dividends will be declared by the its Board of
Directors.

         Voting Rights

         Subject to the rights, if any, of holders of shares of preferred stock
then outstanding, all voting rights are vested in the holders of shares of
common stock. Each share of common stock entitles the holder to one vote on all
matters, including the election of directors. Shareholders of Mercantile do not
have cumulative voting rights.

         Preemptive Rights

         Holders of common stock do not have preemptive rights.

         Liquidation Rights

         Subject to any rights of any preferred stock then outstanding, holders
of common stock are entitled to share on a pro rata basis in the net assets of
Mercantile that remain after satisfaction of all liabilities.

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CERTAIN CHARTER PROVISIONS

         The following provisions of Mercantile's Articles of Incorporation may
delay, defer, prevent, or make it more difficult for a person to acquire
Mercantile or to change control of Mercantile's Board of Directors, reducing
Mercantile's vulnerability to an unsolicited takeover attempt.

         Classification of the Board of Directors

         Mercantile's Articles of Incorporation provide for the Board of
Directors to be divided into three classes with staggered terms; each class to
be as nearly equal in number as possible. Each director is elected for a three
year term. Approximately one-third of the Board positions are filled by a
shareholder vote each year. Any vacancies in the Board, or newly created
director positions, may be filled by vote of the directors then in office. The
Articles of Incorporation provide that the number of directors shall be fixed by
majority of the Board at no fewer than six nor more than fifteen.

         Removal of Directors

         The Michigan Business Corporation Act provides that, unless the
articles of incorporation otherwise provide, shareholders may remove a director
or the entire Board of Directors with or without cause. Mercantile's Articles of
Incorporation provide that a director may be removed only for cause and only by
the affirmative vote of the holders of a majority of the voting power of all the
shares entitled to vote generally in the election of directors.

         Filling Vacancies on the Board of Directors

         Mercantile's Articles of Incorporation provide that any vacancies in
the Board of Directors, or newly created director positions, may be filled by
vote of the directors then in office. A new director chosen to fill a vacancy on
the Board of Directors will serve for the remainder of the full term of the
class in which the vacancy occurred.

         Nominations of Director Candidates

         Mercantile's Articles of Incorporation include a provision governing
nominations of director candidates. Nominations for the election of directors
may be made by the Board of Directors, a nominating committee appointed by the
Board of Directors, or any shareholder entitled to vote for directors. In the
case of a shareholder nomination, the Articles of Incorporation provide certain
procedures that must be followed. A shareholder intending to nominate candidates
for election must deliver written notice containing certain specified
information to the Secretary of the Company at least sixty (60) days but not
more than ninety (90) days prior to the anniversary date of the immediately
preceding annual meeting of shareholders.


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         Certain Shareholder Action

         Mercantile's Articles of Incorporation require that any shareholder
action must be taken at an annual or special meeting of shareholders, that any
meeting of shareholders must be called by the Board of Directors or the Chairman
of the Board, and, unless otherwise provided by law, prohibit shareholder action
by written consent. Shareholders of the Company are not permitted to call a
special meeting of shareholders or require that the Board call such a special
meeting. The Michigan Business Corporation Act permits shareholders holding 10%
or more of all of the shares entitled to vote at a meeting to request the
Circuit Court of the County in which the Company's principal place of business
or registered office is located to order a special meeting of shareholders for
good cause shown.

         Increased Shareholders' Vote for Alteration, Amendment or Repeal of
Article Provisions

         Mercantile's Articles of Incorporation require the affirmative vote of
the holders of at least 66 2/3 percent of the voting stock entitled to vote
generally in the election of directors for the alteration, amendment or repeal
of, or the adoption of any provision inconsistent with the above provisions of
Mercantile's Articles of Incorporation.

CERTAIN ANTI-TAKEOVER PROVISIONS

         Michigan Fair Price Act

         Certain provisions of the Michigan Business Corporation Act establish a
statutory scheme similar to the supermajority and fair price provisions found in
many corporate charters (the "Fair Price Act"). The Fair Price Act provides that
a supermajority vote of 90 percent of the shareholders and no less than
two-thirds of the votes of noninterested shareholders must approve a "business
combination." The Fair Price Act defines a "business combination" to encompass
any merger, consolidation, share exchange, sale of assets, stock issue,
liquidation, or reclassification of securities involving an "interested
shareholder" or certain "affiliates." An "interested shareholder" is generally
any person who owns 10 percent or more of the outstanding voting shares of the
company. An "affiliate" is a person who directly or indirectly controls, is
controlled by, or is under common control with, a specified person.

         The supermajority vote required by the Fair Price Act does not apply to
business combinations that satisfy certain conditions. These conditions include,
among others: (i) the purchase price to be paid for the shares of the company in
the business combination must be at least equal to the highest of either (a) the
market value of the shares or (b) the highest per share price paid by the
interested shareholder within the preceding two-year period or in the
transaction in which the shareholder became an interested shareholder, whichever
is higher; (ii) once becoming an interested shareholder, the person may not
become the beneficial owner of any additional shares of the company except as
part of the transaction which resulted in the interested shareholder becoming an
interested shareholder or by virtue of proportionate stock splits or stock
dividends; and (iii) five years must have elapsed since the person involved
became an interested shareholder.

         The requirements of the Fair Price Act do not apply to business
combinations with an interested shareholder that the Board of Directors has
approved or exempted from the requirements


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of the Fair Price Act by resolution prior to the time that the interested
shareholder first became an interested shareholder.

         Control Share Act

         The Michigan Business Corporation Act regulates the acquisition of
"control shares" of large public Michigan corporations (the "Control Share
Act"). The Control Share Act establishes procedures governing "control share
acquisitions." A control share acquisition is defined as an acquisition of
shares by an acquiror which, when combined with other shares held by that person
or entity, would give the acquiror voting power, alone or as part of a group, at
or above any of the following thresholds: 20 percent, 33-1/3 percent or 50
percent. Under the Control Share Act, an acquiror may not vote "control shares"
unless the company's disinterested shareholders (defined to exclude the
acquiring person, officers of the target company, and directors of the target
company who are also employees of the company) vote to confer voting rights on
the control shares. The Control Share Act does not affect the voting rights of
shares owned by an acquiring person prior to the control share acquisition.

         The Control Share Act entitles corporations to redeem control shares
from the acquiring person under certain circumstances. In other cases, the
Control Share Act confers dissenters' right upon all of the corporation's
shareholders except the acquiring person.

ITEM 2.  EXHIBITS.

The following exhibits are filed with this form:





        EXHIBIT NO.                            EXHIBIT DESCRIPTION
        -----------                            -------------------
                          
             1               Mercantile's Articles of Incorporation are incorporated by
                             reference to exhibit 3.1 of its Form 10-Q for the quarter
                             ended June 30, 2004

             2               Mercantile's Amended and Restated Bylaws dated as
                             of January 16, 2003 are incorporated by reference
                             to exhibit 3.2 of its Registration Statement on
                             Form S-3 (Commission File No. 333-103376) that was
                             filed and became effective on February 21, 2003



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                                    SIGNATURE



         Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the registrant has duly caused this registration statement to be
signed on its behalf by the undersigned, thereto duly authorized, on this 23rd
day of November, 2005.

                           MERCANTILE BANK CORPORATION


                           By: /s/Charles E. Christmas
                               -----------------------
                               Charles E. Christmas
                               Senior Vice President, Chief Financial Officer
                                  and Treasurer
















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                                  EXHIBIT INDEX
                                  -------------





        EXHIBIT NO.                             EXHIBIT DESCRIPTION
        -----------                             -------------------
                          
             1               Mercantile's Articles of Incorporation are incorporated
                             by reference to exhibit 3.1 of its Form 10-Q for the
                             quarter ended June 30, 2004

             2               Mercantile's Amended and Restated Bylaws dated as
                             of January 16, 2003 are incorporated by reference
                             to exhibit 3.2 of its Registration Statement on
                             Form S-3 (Commission File No. 333-103376) that was
                             filed and became effective on February 21, 2003


























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