Sec Form 4 Filing - Witbrodt Kenneth A JR @ CASS INFORMATION SYSTEMS INC - 2006-09-07

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 Witbrodt Kenneth A JR 2. Issuer Name and Ticker or Trading Symbol CASS INFORMATION SYSTEMS INC [ CASS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President, CCB (Last) (First) (Middle) 13001 HOLLENBERG DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 09/07/2006 (Street) BRIDGETON, MO63044 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 09/07/2006 M 324 A $ 16.497 5,073 D Commom Stock 09/07/2006 M 95 A $ 11.751 5,168 D Common Stock ( 1 ) 510 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 Exer cisable Expiration Date Title Amount or Number of Shares Option (Right to buy) $ 11.751 09/07/2006 M 324 01/02/2004 01/02/2007 Common Stock 324 $ 53.725 0 D Option (Right to buy) $ 16.497 09/07/2006 M 95 01/02/2006 01/02/2010 Common Stock 95 $ 53.725 2,492 D Option (Right to buy) $ 23.94 01/02/2011 01/02/2011 Common Stock 678 678 D Option (Right to buy) $ 23.833 01/02/2012 01/02/2012 Common Stock 654 654 D Option (Right to buy) $ 34.1 01/02/2013 01/02/2013 Common Stock 872 872 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Witbrodt Kenneth A JR 13001 HOLLENBERG DRIVE BRIDGETON, MO63044 President, CCB Signatures /s/ Kenneth A. Witbrodt, Jr. 10/26/2006 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Restricted stock bonus; restriction expires equally over a 3 year period.

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.
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