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* KENNEDY KIERAN M. (Last) (First) (Middle) 601 MERRITT 7 (Street) NORWALK CT 06851 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 09/07/2007	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 10% Owner X Officer (give title below) Other (specify below) Senior Vice President	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	16,993	D

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	03/13/2000(1)	03/13/2010	FactSet Common Stock	8,995	22.0833	D
FactSet Common Stock	11/13/2000(1)	11/13/2010	FactSet Common Stock	897	22.8333	D
FactSet Common Stock	10/23/2001(1)	10/23/2011	FactSet Common Stock	3,750	17.5667	D
FactSet Common Stock	10/07/2002(1)	10/07/2012	FactSet Common Stock	720	14.9667	D
FactSet Common Stock	10/07/2002(1)	10/07/2012	FactSet Common Stock	4,782	14.9667	D
FactSet Common Stock	01/22/2004(1)	01/22/2014	FactSet Common Stock	10,974	24.4867	D
FactSet Common Stock	04/20/2005(1)	04/20/2015	FactSet Common Stock	12,326	29	D
FactSet Common Stock	08/14/2006(1)	08/14/2013	FactSet Common Stock	12,483	43.39	D
FactSet Common Stock	08/14/2007(1)	08/14/2014	FactSet Common Stock	12,904	59.36	D
FactSet Common Stock	08/14/2006(2)	08/14/2013	FactSet Common Stock	18,791	43.39	D
FactSet Common Stock	08/14/2007(2)	08/14/2014	FactSet Common Stock	19,807	59.36	D

Explanation of Responses:

1. 20% of option grant is exercisable one year from grant date. Months 13-60: 1.66% of original grant per month.

2. This option shall become exercisable based on the achievement by the issuer of certain financial performance criteria. Options that do not vest at the end of a two-year performance period will be forfeited. Options that become exercisable vest 41.67% after the two-year performance period with the remainder vesting at 1.67% per month thereafter.

	Kieran M. Kennedy	09/17/2007
	** 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).
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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