FactSet Research Systems (FDS) 10-Q 2011 Q2 Quarterly report

EXHIBIT 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of FactSet Research Systems Inc. (the “Company”) on Form 10-Q for the quarter ended February 28, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Maurizio Nicolelli, do hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ MAURIZIO NICOLELLI

Maurizio Nicolelli

Senior Vice President and Director of Finance

(Principal Financial Officer)

April 6, 2011