SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                          FactSet Research Systems Inc.
             (Exact name of registrant as specified in its charter)




       Delaware                                             13-3362547
- ---------------------------------                 ----------------------------
(State of incorporation or                        (I.R.S. Employer
    organization)                                      Identification No.)

      One Greenwich Plaza
      Greenwich, Connecticut                                  06830
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(Address of principal executive offices)                    (Zip Code)

If this Form relates to the registration of a class of debt securities and is
effective upon filing pursuant to General Instruction A.(c)(1), please check the
following box. |_|

If this Form relates to the registration of a class of debt securities and is to
become effective simultaneously with the effectiveness of a concurrent
registration statement under the Securities Act of 1933 pursuant to General
Instructions A.(c)(2), please check the following box. |_|

Securities to be registered pursuant to Section 12(b) of the Act:


  Title of each class                            Name of each exchange on which
  to be so registered                            each class is to be registered
  -------------------                            ------------------------------

Common Stock, par value $.01 per share               New York Stock Exchange
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Securities to be registered pursuant to Section 12(g) of the Act:


                                      None
- -------------------------------------------------------------------------------
                                (Title of Class)


- -------------------------------------------------------------------------------
                                (Title of Class)



INFORMATION REQUIRED IN REGISTRATION STATEMENT Item 1. Description of Registrant's Securities to be Registered. ------------------------------------------------------- A description of the Common Stock of FactSet Research Systems Inc. (the "Company") is incorporated by reference from page 47 of the Company's Registration Statement on Form S-1 (Reg. No. 333-4238), filed with the Securities and Exchange Commission on April 30, 1996. Item 2. Exhibits. 1. -- All exhibits required to by Instruction II to Item 2 will be supplied to the New York Stock Exchange. SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized. REGISTRANT: FactSet Research Systems Inc. DATE: June 20, 1996 By: -------------------------- Howard E. Wille Chairman of the Board and Chief Executive Officer Page 2