MERCANTILE BANK CORP

Major Shareholding Notification • Feb 8, 2006

SC 13G/A 1 merc1230b.htm MERCANTILE BANK CORP. html PUBLIC "-//w3c//dtd html 4.0 transitional//en" MERCANTILE BANK CORPORATION

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

SCHEDULE 13G/A

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED

PURSUANT TO RULE 13d-2(b)

( AMENDMENT 1)

MERCANTILE BANK CORPORATION

( NAME OF ISSUER )

COMMON STOCK

(Title of Class of Securities)

587376104

(CUSIP Number)

DECEMBER 30,2005

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1 (c)
Rule 13d-1 (d)

CUSIP No. 587376104 13G/A Page 1 of 3 pages

1.
I.R.S.

IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) | 13-2624428 |

2.
(b)

1. SEC USE ONLY

4.
Delaware

| NUMBER OF | 5. | SOLE

VOTING POWER | 399,084 |
| --- | --- | --- | --- |
| SHARES | | | |
| BENEFICIALLY | 6. | SHARED

VOTING POWER | 813 |
| OWNED BY | | | |
| EACH | 7. | SOLE

DISPOSITIVE POWER | 430,830 |
| REPORTING | | | |
| PERSON WITH | 8. | SHARED

DISPOSITIVE POWER | 361 |

9.
442,283

10.
CERTAIN SHARES

11.
5.8%

1. TYPE OF REPORTING PERSON* HC

| Item

1(a).
MERCANTILE

BANK CORPORATION |

| Item

1(b).
5650

BYRON CENTER AVENUE, SW WYOMING,

MI 49509 |

| Item

2(a).
JPMorgan

Chase & Co. |

| Item

2(b).
270 PARK

AVE |
| NEW YORK,

NY 10017 |

| Item

2(c).
Delaware

| Item

2(d).
COMMON

STOCK |
| Unless otherwise noted,

security being reported is common stock |

Item 2(e). CUSIP Number: 587376104

| Item

3
Or

(c), Check Whether the Person Filing is a : |

| (a) | | Broker or dealer registered

under Section 15 of the Exchange Act; |
| --- | --- | --- |
| (b) | | Bank as defined in

Section 3(a)(6) of the Exchange Act; |
| (c) | | Insurance company as

defined in Section 3(a)(19) of the |
| | | Exchange Act; |
| (d) | | Investment company

registered under Section 8 of the Investment |
| | | Company Act; |
| (e) | | An investment adviser

in accordance with Rule 13d-1(b)(1)(ii)(E); |
| (f) | | An employee benefit

plan or endowment fund in accordance with |
| | | Rule 13d-1(b)(1)(ii)(F); |
| (g) | X | A parent holding company

or control person in accordance with |
| | | Rule 13d-1(b)(1)(ii)(G); |
| (h) | | A savings association

as defined in Section 3(b) of the Federal |
| | | Deposit Insurance Act; |
| (i) | | A church plan that

is excluded from the definition of an |
| | | Investment company

under Section 3(c)(14) of the Investment |
| | | Company act; |
| (j) | | Group, in accordance

with Rule 13d-1(b)(1)(ii)(J). |

If this statement is filed pursuant to Rule 13d-1(b), check this box. X

Page 2 of 3 pages

ITEM 4. Ownership

| Provide

the following information regarding the aggregate number and
Percentage

of the class of securities of issuer identified in Item 1. | | | |
| (a) | Amount

beneficially owned: 442,283 | | |
| | Including 0 shares where there is a Right to Acquire. | | |
| (b) | Percent

of class: 5.8% | | |
| (c) | Number

of shares as to which such person has: | | |
| | (i) | Sole power to vote or to

direct the vote: | 399,084 |
| | (ii) | Shared power to vote or

to direct the vote: | 813 |
| | (iii) | Sole power to dispose or

to direct the disposition of: | 430,830 |
| | (iv) | Shared power to dispose

or to direct the disposition of: | 361 |

ITEM 5. Ownership of Five Percent or Less of a Class. NOT APPLICABLE

| If this statement

is being filed to report the fact that as of the date
hereof the reporting

person has ceased to be the beneficial owner of more |
| than five percent

of the class of securities, check the following. ( ) |

ITEM 6. Ownership of More than Five Percent on Behalf of Another Person.

| JPMorgan

Chase & Co. is the beneficial owner of 442,283 shares of the
issuer's

common stock on behalf of other persons known to have one or more of |
| the following: |
| the

right to receive dividends for such securities; |
| the

power to direct the receipt of dividends from such securities; |
| the

right to receive the proceeds from the sale of such securities; |
| the

right to direct the receipt of proceeds from the sale of such securities; |
| No such

person is known to have an interest in more than 5% of the class of |
| securities

reported herein unless such person is identified below. |

| Item

7.
Security

being reported on by the Parent Holding Company. |
| This

notice is filed on behalf of JPMorgan Chase & Co. and its wholly owned |
| Subsidiary

(ies), |
| JPMorgan

Chase Bank, National Association |
| J.P.

Morgan Investment Management Inc. |
| Bank

One Trust Co., N.A. |
| JPMorgan

Investment Advisors Inc. |

| Item

8.
Not Applicable

| Item

9.
Not Applicable

ITEM 10. Certifications

| By signing below

I certify that, to the best of my knowledge and belief,
the securities referred

to above were not acquired and are not held for the |
| purpose of or with

the effect of changing or influencing the control of the |
| issuer of the securities

and were not acquired and are not held in connection |
| with or as a participant

in any transaction having that purpose or effect. |

Page 3 of 3 pages

SIGNATURE
After reasonable inquiry and to

the best of my knowledge and belief, I certify that the |
| information set forth in this statement

is true, complete and correct. |

| Dated: February 08,

2006
By: /s/ Margaret R. Rubin
--------------------------------------
Margaret R. Rubin
Corporate Compliance

| The original statement shall be

signed by each person on whose behalf the statement
is filed or his authorized representative.

If the statement is signed on behalf of |
| a person by his authorized representative

(other than an executive officer or general |
| partner of the filing person),

evidence of the representative's authority to sign on |
| behalf of such person shall be

filed with the statement, provided, however, that a |
| power of attorney for this purpose

which is already on file with the commission may |
| be incorporated by reference. The

name and any title of each person who signs the |
| the statement shall be typed or

printed beneath his signature. |