8-K

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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             ----------------------


                                    FORM 8-K


                                 CURRENT REPORT

     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


          Date of Report (Date of earliest event reported: MAY 13, 2005


                                IDEX CORPORATION
             (Exact Name of Registrant as Specified in its Charter)


             DELAWARE                    1-10235                36-3555336
 (State or other jurisdiction of       (Commission           (I.R.S. Employer
  incorporation or organization)       File Number)         Identification No.)




                                 630 DUNDEE ROAD
                           NORTHBROOK, ILLINOIS 60062
          (Address of principal executive offices, including zip code)



                                 (847) 498-7070
                         (Registrant's telephone number)



         Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligations of the registrant under any of the
following provisions:

|_|  Written communications pursuant to Rule 425 under the Securities Act
     (17CFR230.425)

|_|  Soliciting material pursuant to Rule 14a-12 under the Exchange Act
     (17CFR240.14a-12)

|_|  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17CFR240.14d-2(b))

|_|  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17CFR240.13e-4(c))


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ITEM 8.01     OTHER EVENTS

On May 13, 2005, IDEX Corporation issued a press release announcing that Dennis
K. Williams, the Company's chairman of the board, has adopted a prearranged
trading plan, in accordance with the guidelines specified by Rule 10b5-1 under
the Securities Exchange Act of 1934. A copy of this press release is filed as
Exhibit 99.1 to this Current Report on Form 8-K.


ITEM 9.01     FINANCIAL STATEMENTS AND EXHIBITS

              Exhibits

              99.1  Press release dated May 13, 2005




                                   SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                     IDEX CORPORATION

                                     /s/ Dominic A. Romeo
                                     --------------------------
                                     Dominic A. Romeo
                                     Vice President and Chief Financial Officer


May 17, 2005

EX-99.1

                                                                    EXHIBIT 99.1



                 IDEX CORPORATION CHAIRMAN TO ADOPT 10b5-1 PLAN

NORTHBROOK, IL, MAY 13, 2005 -- IDEX CORPORATION (NYSE: IEX) today announced
that Dennis K. Williams, the company's chairman of the board, has adopted a
prearranged trading plan, in accordance with the guidelines specified by Rule
10b5-1 under the Securities and Exchange Act of 1934, to sell up to 897,300
option shares of IDEX common stock over the next 12 months.

As previously announced, Mr. Williams retired as the company's president and
chief executive officer in March 2005 and will continue to serve as chairman of
the board through the later of March 31, 2006 or the date of the company's 2006
annual meeting, at which time he plans to retire from the company and its Board
of Directors.

Within 30 days of his retirement from the Board of Directors, the stock options
granted to Mr. Williams during his tenure as president and chief executive
officer will expire. The trading plan is designed to allow Mr. Williams to
exercise his options in an orderly fashion over the next approximately 12
months.

ABOUT IDEX CORPORATION
IDEX Corporation is the world leader in fluid-handling technologies for positive
displacement pumps and metering products, dispensing equipment for color
formulation, and other highly engineered products including fire suppression
equipment, rescue tools and stainless steel band clamping systems. Its products
are sold in niche markets to a wide range of industries throughout the world.
IDEX shares are traded on the New York Stock Exchange and Chicago Stock Exchange
under the symbol "IEX."

       FOR FURTHER INFORMATION ON IDEX CORPORATION AND ITS BUSINESS UNITS,
               VISIT THE COMPANY'S WEB SITE AT www.idexcorp.com.