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) August 21, 1998 TELLABS, INC. (Exact name of registrant as specified in charter) Delaware 0-9692 36-3831568 (State or other jurisdiction (Commission (IRS employer of incorporation) file number) identification no.) 4951 Indiana Avenue, Lisle, Illinois 60532 (Address of principal executive office) (Zip Code) Registrant's telephone number, including area code (630) 378-8800 N/A (Former name or former address, if changed since last report) 1 ITEM 5. OTHER EVENTS Tellabs, Inc. (the "Company") and CIENA Corporation have agreed to adjourn their respective shareholders meeting until September 9, 1998. Further details are included in a copy of the press release, which is attached hereto as Exhibit 20.10 and incorporated herein by reference. Item 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS (c) Exhibits Exhibit 20.10 - Press release issued by Tellabs, Inc. dated August 21, 1998. 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. TELLABS, INC. August 21, 1998 s\ J. Peter Johnson --------------------- J. Peter Johnson Vice President, Conroller, and Chief Accounting Officer 2