As filed with the Securities and Exchange Commission on June 11, 1999 Registration No. 333-23007 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ____________________ AMERICAN POWER CONVERSION CORPORATION (Exact name of registrant as specified in its charter) Massachusetts 04-2722013 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification Number) 132 Fairgrounds Road West Kingston, Rhode Island 02892 (401) 789-5735 (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) ____________________ Rodger B. Dowdell, Jr. President and Chief Executive Officer 132 Fairgrounds Road West Kingston, Rhode Island 02892 (401) 789-5735 (Name and address, including zip code, and telephone number, including area code, of agent for service of process) ____________________ Copies to: Jeffrey Giguere, Esq. William B. Simmons, Jr., Esq. AMERICAN POWER CONVERSION TESTA, HURWITZ & THIBEAULT, LLP CORPORATION High Street Tower 132 Fairgrounds Road 125 High Street West Kingston, Rhode Island Boston, Massachusetts 02110 02892 (617) 248-7000 (401) 789-5735 The Registrant hereby removes from registration under this Registration Statement (333-23007) 354,746 shares of Common Stock, par value $.01 per share (the "Common Stock"), registered hereunder (all shares originally registered hereunder being referred to as the "Offered Shares"), that have not been sold pursuant to this Registration Statement. By the terms of this Registration Statement and a Registration Rights Agreement among the Registrant and the holders of Offered Shares, the Registrant was required to keep this Registration Statement effective until the earlier of the sale of all the Offered Shares pursuant to the registration statement or February 14, 1999 (being the second anniversary of the effective date of the Merger). As of the date hereof, 605,542 Offered Shares have been sold or otherwise transferred by selling stockholders under this Registration Statement. Pursuant to the Registrant's Undertaking in Item 17 of this Registration Statement, the Registrant hereby removes from registration the 354,746 Offered Shares that have not been sold pursuant to this Registration Statement prior to the date hereof SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment No. 1 to this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in West Kingston, Rhode Island on June 11, 1999. AMERICAN POWER CONVERSION CORPORATION By: /s/ Donald M. Muir Donald M. Muir Chief Financial Officer Pursuant to the requirements of the Securities Act of 1933, this Post- Effective Amendment No. 1 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated. Signature Title(s) Date * President, Chief Executive Officer and June 11, 1999 Chairman of the Board of Directors Rodger B. Dowdell, Jr. (Principal Executive Officer) * Vice President, Clerk and Director June 11, 1999 Emanuel E. Landsman * Vice President and Director June 11, 1999 Neil E. Rasmussen * Director June 11, 1999 Ervin F. Lyons * Director June 11, 1999 James D. Gerson /s/ Donald M. Muir Chief Financial Officer June 11, 1999 Donald M. Muir (Principal Financial and Accounting Officer) *By: /s/ Donald M. Muir Donald M. Muir Attorney-in-Fact