X0202 4 2005-12-20 0001092367 SYCAMORE NETWORKS INC SCMR 0001012501 FERRI PAUL J C/O MATRIX PARTNERS 1000 WINTER STREET, SUITE 4500 WALTHAM MA 02451 1 0 0 0 Common Stock 100818 I Partnership Common Stock 294735 D Non-Qualified Stock Option (right to buy) 4.81 2005-12-19 4 A 0 30000 4.81 A 2005-12-19 2015-12-19 Common Stock 30000 180000 D By Matrix V Entrepreneurs Fund, L.P. Affiliated partnership under common control. The reporting person disclaims beneficial ownership of the securities indicated to the extent to which such person does not have an actual pecuniary interest in such securities. The reporting herein of such securities shall not be construed as an admission that the undersigned is the beneficial owner of any such securities for purposes of Section 16 of the Securities Exchange Act of 1934 or for any other purpose. \s\ Paul J. Ferri 2005-12-20