As filed with the Securities and Exchange Commission on June 13, 2001 Registration No. 33-55992 ================================================================================ U.S. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ------------------- POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 UNDER THE SECURITIES ACT OF 1933 SYNBIOTICS CORPORATION (Name of registrant as specified in its charter) California 95-3737816 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 11011 Via Frontera San Diego, California 92127 (Address of principal executive offices) (Zip Code) SYNBIOTICS CORPORATION 1991 STOCK OPTION PLAN (Full title of the plan) MICHAEL K. GREEN Senior Vice President and Chief Financial Officer SYNBIOTICS CORPORATION 11011 Via Frontera, San Diego, California 92127 (Name and address of agent for service) (858) 451-3771 (Telephone number, including area code, of agent for service) Copies to: HAYDEN J. TRUBITT, ESQ. BROBECK, PHLEGER & HARRISON LLP 12390 El Camino Real San Diego, CA 92130 This registration statement shall become effective immediately upon filing with the Securities and Exchange Commission, and sales of the registered securities will begin as soon as reasonably practicable after such effective date. ================================================================================ SYNBIOTICS CORPORATION Deregistration ------------------ This registration statement registered 400,000 shares of the Common Stock of Synbiotics Corporation (the "Company"). These shares were offered pursuant to the Company's 1991 Stock Option Plan (the "Option Plan"). 84,350 shares have been issued under the Option Plan. The remaining 315,650 stock options outstanding under the Option Plan have been rolled into the Company's 1995 Stock Option/Stock Issuance Plan, separately registered under a Form S-8 registration statement filed with respect to the 1995 Stock Option/Stock Issuance Plan. Accordingly, the Company hereby deregisters 315,650 of the Common Stock originally covered by the registration statement. II-1 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 of the requirements for filing on Form S-8, and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Diego, State of California, on June 13, 2001. SYNBIOTICS CORPORATION By /s/ Michael K. Green --------------------- Michael K. Green Senior Vice President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. Signature Title Date - ----------------------------------------- ------------------------------------------------ ----------------- /s/ Paul A. Rosinack Chief Executive Officer, President and Director June 13, 2001 - ---------------------------------- (Principal Executive Officer) Paul A. Rosinack /s/ Michael K. Green Chief Financial Officer (Principal Financial June 13, 2001 - ---------------------------------- Officer) Michael K. Green /s/ Keith A. Butler Corporate Controller (Principal Accounting June 13, 2001 - ---------------------------------- Officer) Keith A. Butler /s/ Patrick Owen Burns Director June 13, 2001 - ---------------------------------- Patrick Owen Burns /s/ Rigdon Currie Director June 13, 2001 - ---------------------------------- Rigdon Currie /s/ James C. DeCesare Director June 13, 2001 - ---------------------------------- James C. DeCesare /s/ Joseph Klein III Director June 13, 2001 - ---------------------------------- Joseph Klein III /s/ Donald E. Phillips Director June 13, 2001 - ---------------------------------- Donald E. Phillips II-2