SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Blair Nancy E (Last) (First) (Middle) BLAIR & POTTS P.O. BOX 1214 (Street) STAMFORD CT 06904-1214 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 09/07/2005	3. Issuer Name and Ticker or Trading Symbol FACTSET RESEARCH SYSTEMS INC [ FDS ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Factset Common Stock	3,900,555(1)	I	Executor of Estate
Factset Common Stock	1,500,000(2)	I	Executor of Estate holding beneficial interest

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Factset Common Stock Options	12/22/2005	12/22/2014	Factset Common Stock	22,500	0	I	Executor of Estate

Explanation of Responses:

1. On Sep. 27, 2005 the estate sold 1,800,000 shares of Factset common stock through a Rule 144 transaction.

2. The estate is the non-managing member of Wille Family Investments LLC, which owns 1,500,000 shares of Factset common stock. Brian C. Wille is the manager of Wille Family Investments LLC.

Remarks:

This Form 3 is also filed on behalf of the Estate of Howard E. Wille, P.O. Box 1214, Stamford, CT 06904-1214 and the co-executor of the estate Brian C. Wille, 1088 Park Avenue, New York, NY 10128.

	/s/ Nancy E. Blair	09/29/2005
	/s/ Brian C. Wille	09/29/2005
	/s/ Nancy E. Blair, for the Estate	09/29/2005
	** 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 5 (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).
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