================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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): NOVEMBER 19, 2003 IONICS, INCORPORATED (Exact name of registrant as specified in its charter) MASSACHUSETTS 1-7211 04-2068530 (State of incorporation) (Commission File Number) (IRS Employer Identification No.) 65 GROVE STREET, WATERTOWN, MA 02472 (617) 926-2500 (Address of principal executive offices) (Zip Code) (Registrant's telephone number, including area code) ================================================================================ Item 5. Other Events and Required FD Disclosure. ---------------------------------------- On November 19, 2003, Ionics, Incorporated issued a press release announcing the signing of a definitive agreement to acquire Ecolochem, Inc. and its affiliated companies. A copy of the press release is attached hereto as Exhibit 99.1 and is hereby incorporated by reference. Item 7. Financial Statements and Exhibits. ---------------------------------- (c) Exhibits Exhibit Number Description -------------- ----------- 99.1 Press release dated November 19, 2003 announcing the signing of a definitive agreement to acquire Ecolochem, Inc. and its affiliated companies. 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 duly authorized. IONICS, INCORPORATED November 19, 2003 By: /s/ Stephen Korn --------------------------- Name: Stephen Korn Title: Vice President and General Counsel 2 EXHIBIT INDEX ------------- Number Description Page Number ------ ----------- ----------- 99.1 Press release dated November 19, 2003 announcing the 4 signing of a definitive agreement to acquire Ecolochem, Inc. and its affiliated companies. 3