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): October 27, 2004 IRIS INTERNATIONAL, INC. (Exact name of registrant as specified in its charter) DELAWARE 1-11181 94-2579751 (State or other jurisdiction (Commission File Number) (I.R.S. Employer of incorporation) Identification No.) 9172 ETON AVENUE CHATSWORTH, CA 91311 (Address of Principal Executive Offices/Zip Code) (818) 709-1244 (Registrant's telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (SEE General Instruction A.2. below): |_| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange ct (17 CFR 240.14d-2(B)) |_| Pre-commencement communications pursuant to Rule 13e-4(c)) under the Exchange Act (17 CFR 240.13e-4c)) ITEM 7.01 - REGULATION FD DISCLOSURE On October 27, 2004, IRIS International, Inc. issued a press release updating its outlook for fiscal 2004 results of operations. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by this reference. The information in this report is furnished pursuant to Item 7.01 and shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except as shall be expressly set forth by specific reference in such a filing. ITEM 9.01 - FINANCIAL STATEMENTS AND EXHIBITS (Information furnished in this Item 9.01 is furnished pursuant to Item 7.01) (a) Financial Statements of business acquired. Not applicable. (b) Pro Forma Financial Information. Not applicable. (c) Exhibits. The following exhibits are filed herewith: Exhibit Number Description ------- ----------- 99.1 Press Release dated October 27, 2004, published by IRIS International, Inc. 2 SIGNATURE 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. IRIS INTERNATIONAL, INC. Date: October 27, 2004 By: /s/ Martin G. Paravato --------------------------------- Martin G. Paravato Chief Financial Officer 3 EXHIBIT INDEX Exhibit Number Description - ------- ----------- 99.1 Press Release dated October 27, 2004, published by IRIS International, Inc. 4