Ownership Submission
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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
GRUDNOWSKI THOMAS
   2. Issuer Name and Ticker or Trading Symbol
FAIR ISAAC CORP [FIC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President & CEO
(Last)
(First)
(Middle)
901 MARQUETTE AVENUE, SUITE 3200		 3. Date of Earliest Transaction (Month/Day/Year)
03/01/2005
(Street)

MINNEAPOLIS, MN 55402		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 03/01/2005   M   100,000 A $ 9.6297 122,500 D  
Common Stock 03/01/2005   S   9,500 D $ 34.25 113,000 D  
Common Stock 03/01/2005   S   1,500 D $ 34.188 111,500 D  
Common Stock 03/01/2005   S   13,800 D $ 34.1701 97,700 D  
Common Stock 03/01/2005   S   1,000 D $ 34.119 96,700 D  
Common Stock 03/01/2005   S   700 D $ 34.1 96,000 D  
Common Stock 03/01/2005   S   1,500 D $ 34.0813 94,500 D  
Common Stock 03/01/2005   S   4,100 D $ 34.0487 90,400 D  
Common Stock 03/01/2005   S   500 D $ 34.02 89,900 D  
Common Stock 03/01/2005   S   200 D $ 34.01 89,700 D  
Common Stock 03/01/2005   S   3,600 D $ 34.0006 86,100 D  
Common Stock 03/01/2005   S   2,700 D $ 34 83,400 D  
Common Stock 03/01/2005   S   1,100 D $ 33.9909 82,300 D  
Common Stock 03/01/2005   S   1,000 D $ 33.99 81,300 D  
Common Stock 03/01/2005   S   3,500 D $ 33.9891 77,800 D  
Common Stock 03/01/2005   S   1,900 D $ 33.98 75,900 D  
Common Stock 03/01/2005   S   5,100 D $ 33.9782 70,800 D  
Common Stock 03/01/2005   S   8,700 D $ 33.97 62,100 D  
Common Stock 03/01/2005   S   4,200 D $ 33.96 57,900 D  
Common Stock 03/01/2005   S   2,400 D $ 33.9596 55,500 D  
Common Stock 03/01/2005   S   700 D $ 33.95 54,800 D  
Common Stock 03/01/2005   S   2,500 D $ 33.94 52,300 D  
Common Stock 03/01/2005   S   1,100 D $ 33.939 51,200 D  
Common Stock 03/01/2005   S   400 D $ 33.93 50,800 D  
Common Stock 03/01/2005   S   800 D $ 33.9275 50,000 D  
Common Stock 03/01/2005   S   3,800 D $ 33.92 46,200 D  
Common Stock 03/01/2005   S   400 D $ 33.91 45,800 D  
Common Stock 03/01/2005   S   1,700 D $ 33.9 44,100 D  
Common Stock 03/01/2005   S   12,200 D $ 33.89 31,900 D  
Common Stock 03/01/2005   S   9,400 D $ 33.84 (1) 22,500 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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 Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 9.6297 03/01/2005   M     100,000 12/02/2000(2) 08/23/2009 Common Stock 100,000 $ 0 642,500 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GRUDNOWSKI THOMAS
901 MARQUETTE AVENUE
SUITE 3200
MINNEAPOLIS, MN 55402		   X     President & CEO  

Signatures

 /s/ Andrea M. Fike, Attorney-in-fact   03/02/2005
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) $33.84 was the average sale price. Actuals were: 2,200 shares sold at $33.88; 200 shares sold at $33.87; 400 shares sold at $33.86; 500 shares sold at $33.85; 100 shares sold at $33.84; 200 shares sold at $33.83; 100 shares sold at $33.82; 1,200 shares sold at $33.81; 4,500 shares sold at $33.80.
(2) 25% of the shares vested on this date; the remaining 75% vested in equal monthly installments thereafter over three years.

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