FORM 4
[ X ] 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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

SCHLUETER THOMAS 		2. Issuer Name and Ticker or Trading Symbol

FIRSTBANK CORP [ FBMI ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Vice President
(Last)          (First)          (Middle)

311 WOODWORTH AVENUE 		3. Date of Earliest Transaction (MM/DD/YYYY)

6/1/2014
(Street)

ALMA, MI 48801
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   6/1/2014     J (1)    1313   D   (1) 0   I   by Spouse Trust  
Common Stock   6/1/2014     J (2)    1800   D   (2) 0   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Stock Option   $22.8662   6/1/2014     J   (3)       1378.13    11/28/2010   11/28/2015   Common Stock   1378.13     (3) 0   D    
Stock Option   $22   6/1/2014     J   (3)       1312.50    11/27/2011   11/27/2016   Common Stock   1312.50     (3) 0   D    
Stock Options   $16   6/1/2014     J   (3)       3075    12/3/2012   12/3/2017   Common Stock   3075     (3) 0   D    
Stock Option   $7.80   6/1/2014     J   (3)       3075    11/24/2013   11/24/2018   Common Stock   3075     (3) 0   D    
Stock Option   $8.60   6/1/2014     J   (3)       3075    11/23/2014   11/23/2019   Common Stock   3075     (3) 0   D    
Stock Option   $5.19   6/1/2014     J   (3)       3075    11/22/2015   11/22/2020   Common Stock   3075     (3) 0   D    

Explanation of Responses:
( 1)  (1) On June 1, 2014, pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated August 14, 2013, between Firstbank Corporation ("Firstbank") and Mercantile Bank Corporation ("Mercantile"), each share of common stock of Firstbank was converted into the right to receive 1 share of Mercantile common stock.
( 2)  (2) On June 1, 2014, pursuant to the Merger Agreement, these shares of restricted common stock of Firstbank accelerated vesting consistent with the Merger Agreement and applicable plan documents and, as with each other share of common stock of Firstbank, each such vested share was converted into the right to receive 1 share of Mercantile common stock.
( 3)  (3) On June 1, 2014, pursuant to the Merger Agreement, each Firstbank stock option will be converted into an option to purchase Mercantile common stock per the equity award exchange ratio as referred to in the Merger Agreement.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SCHLUETER THOMAS
311 WOODWORTH AVENUE
ALMA, MI 48801

Vice President

Signatures
/s/ Thomas O. Schlueter 6/3/2014
** Signature of Reporting Person Date


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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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