UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A Amendment No. 1 to Form 10-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 27, 1997 [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to _______ Commission File Number 0-23263 EXCEL SWITCHING CORPORATION ----------------------------------------------------- (Exact name of registrant as specified in its charter) MASSACHUSETTS 04-2992806 ------------- ---------- (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification Number) 255 INDEPENDENCE DRIVE ---------------------- HYANNIS, MASSACHUSETTS 02601 ---------------------------- (Address of principal executive offices) (Zip code) (508) 862-3000 -------------- (Registrant's telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: None Securities registered pursuant to Section 12(g) of the Act: Common Stock, $.01 par value Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES: [X] NO: [ ] Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ] The aggregate market value of the Registrant's Common Stock, $.01 par value, held by non-affiliates of the Registrant as of March 6, 1998 was $629,092,888 based on the price of $19.25 on that date as reported on the Nasdaq National Market. As of March 6, 1998, 32,720,200 shares of the Registrant's Common Stock, $.01 par value, were issued and outstanding. DOCUMENTS INCORPORATED BY REFERENCE (1) Specified portions of the Company's Proxy Statement, which is expected to be filed within 120 days after the end of the Company's fiscal year, are incorporated by reference into Part III (Items 10, 11, 12 and 13) of this Report. 1 This Amendment No. 1 on Form 10-K/A to the Registrant's Annual Report on Form 10-K for the fiscal year ended December 27, 1997 (the "Report") if being filed to amend and restate Exhibit 27 to the Report. Such Exhibit 27 is hereby amended and restated in its entirety. The other exhibits to the Report are not being amended and have been previously filed with the Securities and Exchange Commission with the Report. 2 SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Amendment No. 1 to the Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized, this 1st day of May 1998. EXCEL SWITCHING CORPORATION By: /s/ Robert P. Madonna ----------------------------------------------- Robert P. Madonna President, Chief Executive Officer and Chairman of the Board Pursuant to the requirements of the Securities Exchange Act of 1934, this Amendment No. 1 to the Annual Report on Form 10-K has been signed by the following persons in the capacities and on the dates indicated. SIGNATURE TITLE(S) DATE - -------------------------------------- ------------------------------------------ ---------------------- /s/ Robert P. Madonna Director, President, Chief Executive May 1, 1998 - -------------------------------------- Officer and Chairman of the Board Robert P. Madonna (Principal Executive Officer) /s/ Stephen S. Galliker Vice President, Finance and May 1, 1998 - -------------------------------------- Administration and Chief Financial Stephen S. Galliker Officer (Principal Financial and Accounting Officer) /s/ Christopher Stavros Director, Vice President, General Counsel May 1, 1998 - -------------------------------------- and Clerk Christopher Stavros /s/ Edward L. Breslow Director May 1, 1998 - -------------------------------------- Edward L. Breslow /s/ John Loughlin Director May 1, 1998 - -------------------------------------- John Loughlin 3