X0202 3 2005-11-10 0 0001316360 IHS Inc. IHS 0001194065 PERKINS DONALD S C/O IHS INC. 15 INVERNESS WAY EAST ENGLEWOOD CO 80112 0 0 1 0 Class A common stock 41250000 I See footnote Class B common stock Class A common stock 13750000 I See footnote Includes up to 16,692,250 shares of Class A common stock being sold pursuant to a prospectus contained in IHS Inc.'s registration statement on Form S-1 (Registration No. 333-122565) and 4,687,500 shares of Class A common stock being sold pursuant to an Amended and Restated Stock Purchase Agreement by and among Urpasis Investments Limited, Urvanos Investments Limited, IHS Inc., General Atlantic Partners 82, L.P., GAP Coinvestments III, LLC and GAP Coinvestments IV, LLC, dated October 6, 2005. Mr. Perkins is filing this form in his capacity as a director of Tornabuoni Limited, an entity that oversees the trustee of the indirect sole owner of the securities. The board of directors of Tornabuoni Limited may only act by unanimous vote. Mr. Perkins disclaims beneficial ownership of the securities. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock. In addition, each share of Class B common stock shall convert automatically, without any action by the holder, into one share of Class A common stock upon the occurrence of certain events as described in IHS Inc.'s registration statement on Form S-1 (Registration No. 333-122565) in the section captioned "Description of Capital Stock--Common Stock--Conversion." Each share of Class B common stock is convertible into one share of Class A common stock. /s/ STEPHEN GREEN 2005-11-10