X0202 4 2006-03-15 0 0001278382 GLOBAL SIGNAL INC GSL 0001292336 GREENHILL CAPITAL PARTNERS, LLC 300 PARK AVENUE, 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001292339 GCP MANAGING PARTNER, L.P. 300 PARK AVENUE, 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001292345 GCP, L.P. 300 PARK AVENUE, 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001282977 GREENHILL & CO INC 300 PARK AVENUE 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001292335 GCP 2000, LLC 300 PARK AVENUE, 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001120194 GREENHILL CAPITAL PARTNERS LP 300 PARK AVE 23RD FL NEW YORK NY 10022 0 0 1 0 0001288439 BOK SCOTT L 300 PARK AVENUE 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001288437 GREENHILL ROBERT F 300 PARK AVENUE 23RD FLOOR NEW YORK NY 10022 0 0 1 0 0001241677 NIEHAUS ROBERT H 300 PARK AVENUE, 23RD FLOOR NEW YORK NY 10022 0 0 1 0 Common Stock; par value $0.01 per share 2006-03-15 4 X 0 128800 18.00 A 10543978 I Through limited partnerships Option to buy Common Stock ("Options") 18.00 2006-03-15 4 X 0 128800 0 D 2014-06-08 Common Stock 128800 0 I Through limited partnerships Immediately. This Form 4 is being filed by more than one reporting person. Greenhill Capital Partners, LLC, which is the record owner of 32,200 shares of Common Stock and which may be deemed to be the beneficial owner of an additional 10,382,978 shares of Common Stock through the beneficial ownership of such shares by certain affiliated ownerships and whose sole member is Greenhill & Co., Inc., is the general partner of GCP Managing Partner, L.P. GCP Managing Partner, L.P. and GCP, L.P. are general partners of Greenhill Capital Partners, L.P., which acquired 79,476 shares of Common Stock pursuant to its exercise of the Options, Greenhill Capital Partners (Executives), L.P., which acquired 12,544 shares of Common Stock pursuant to its exercise of the Options, Greenhill Capital, L.P., which acquired 25,424 shares of Common Stock pursuant to its exercise of the Options, and Greenhill Capital Partners (Cayman), L.P., which acquired 11,356 shares of Common Stock pursuant to its exercise of the Options. GCP 2000, LLC is the general partner of GCP, L.P. GCP 2000, LLC is in turn controlled by its Senior Members, Scott L. Bok, Robert F. Greenhill and Robert H. Niehaus. Mr. Niehaus is also a member of the Board of Directors of the Issuer. Each reporting person disclaims beneficial ownership of the reported securities except and to the extent of its or his pecuniary interest therein. Greenhill Capital Partners, LLC, By: Ulrika Ekman, /s/ Ulrika Ekman 2006-03-15 GCP 2000, LLC, By: Robert H. Niehaus, Chairman, /s/ Robert H. Niehaus 2006-03-15 GCP, L.P., By: GCP 2000, LLC, its general partner, By: Robert H. Niehaus, Chairman, /s/ Robert H. Niehaus 2006-03-15 Greenhill Capital Partners, L.P., By: GCP 2000, LLC, its general partner and GCP, L.P., its general partner, By: Robert H. Niehaus, Chairman, /s/ Robert H. Niehaus 2006-03-15 Greenhill Capital Partners, L.P., By: GCP Managing Partner, L.P., its managing general partner and Greenhill Capital Partners, LLC, its general partner, By: Robert H. Niehaus, Chairman, /s/ Robert H. Niehaus 2006-03-15 GCP Managing Partner, L.P., By: Greenhill Capital Partners, LLC, its general partner, By: Robert H. Niehaus, Chairman, /s/ Robert H. Niehaus 2006-03-15 Greenhill & Co., Inc., By: Ulrika Ekman, General Counsel and Secretary, /s/ Ulrika Ekman 2006-03-15 Scott L. Bok, /s/ Scott L. Bok 2006-03-15 Robert F. Greenhill, /s/ Robert F. Greenhill 2006-03-15 Robert H. Niehaus, /s/ Robert H. Niehaus 2006-03-15