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
                                                                                  
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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 *

SIEBECKER WALTER F 		2. Issuer Name and Ticker or Trading Symbol

FACTSET RESEARCH SYSTEMS INC [ FDS ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

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

601 MERRITT 7 		3. Date of Earliest Transaction (MM/DD/YYYY)

1/13/2016
(Street)

NORWALK, CT 06851
(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
FactSet Common Stock   1/13/2016     M    1611   A $91.06   27439   D    
FactSet Common Stock   1/13/2016     M    964   A $107.65   28403   D    
FactSet Common Stock   1/13/2016     M    461   A $138.48   28864   D    
FactSet Common Stock   1/13/2016     M    2097   A $87.26   30961   D    
FactSet Common Stock   1/13/2016     M    3085   A $66.81   34046   D    
FactSet Common Stock   1/13/2016     M    2419   A $95.05   36465   D    
FactSet Common Stock   1/13/2016     M    4500   A $58.78   40965   D    
FactSet Common Stock   1/13/2016     S    1611   D $147.15   39354   D    
FactSet Common Stock   1/13/2016     S    964   D $147.23   38390   D    
FactSet Common Stock   1/13/2016     S    461   D $147.25   37929   D    
FactSet Common Stock   1/13/2016     S    2097   D $146.84   35832   D    
FactSet Common Stock   1/13/2016     S    3085   D $146.12   32747   D    
FactSet Common Stock   1/13/2016     S    6919   D $146.11   25828   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
Non-Qualified Stock Option (right to buy)   $91.06   1/13/2016     M         1611    1/15/2014   1/15/2020   FactSet Common Stock   1611     (1) 18409   D    
Non-Qualified Stock Option (right to buy)   $107.65   1/13/2016     M         964    1/15/2015   1/15/2021   FactSet Common Stock   964     (1) 17445   D    
Non-Qualified Stock Option (right to buy)   $138.48   1/13/2016     M         461    1/13/2016   1/15/2022   FactSet Common Stock   461     (1) 16984   D    
Non-Qualified Stock Option (right to buy)   $87.26   1/13/2016     M         2097    1/13/2013   1/13/2019   FactSet Common Stock   2097     (1) 14887   D    
Non-Qualified Stock Option (right to buy)   $66.81   1/13/2016     M         3085    1/15/2011   1/15/2017   FactSet Common Stock   3085     (1) 11802   D    
Non-Qualified Stock Option (right to buy)   $95.05   1/13/2016     M         2419    1/14/2012   1/14/2018   FactSet Common Stock   2419     (1) 9383   D    
Non-Qualified Stock Option (right to buy)   $58.78   1/13/2016     M         4500    1/16/2008   1/16/2017   FactSet Common Stock   4500     (1) 4883   D    
Non-Qualified Stock Option (right to buy)   $87.26   1/13/2016     J         525   (2)   1/13/2017   1/13/2019   FactSet Common Stock   525     (2) 4358   D    
Non-Qualified Stock Option (right to buy)   $91.06   1/13/2016     J         1072   (2)   1/15/2017   1/15/2020   FactSet Common Stock   1072     (2) 3286   D    
Non-Qualified Stock Option (right to buy)   $107.65   1/13/2016     J         1440   (2)   1/15/2017   1/15/2021   FactSet Common Stock   1440     (2) 1846   D    
Non-Qualified Stock Option (right to buy)   $138.48   1/13/2016     J         1846   (2)   1/15/2017   1/15/2022   FactSet Common Stock   1846     (2) 0   D    

Explanation of Responses:
( 1)  Column 8 has been intentionally left blank because the transaction was an exercise of a derivative security.
( 2)  Walter F. Siebecker resigned from the Board effective December 15, 2015, concurrent with the date of FactSet's 2015 Annual Meeting of Stockholders. These amounts represent a pre-vesting forfeiture of non-qualified stock options granted to Mr. Siebecker during his term as a Director.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SIEBECKER WALTER F
601 MERRITT 7
NORWALK, CT 06851 		X



Signatures
/s/ Walter F. Siebecker 1/15/2016
** 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.
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