X0201 42003-12-03 0001020569 IRON MOUNTAIN INC/PA IRM 0001183339 LITTLE ARTHUR D P.O. BOX 166 HUNTRESS BRIDGE ROAD S. EFFINGHAM NH 03882 1000Common Stock, par value $.01 per share2003-12-034M0607927.4133A6079DCommon Stock, par value $0.01 per share2003-12-034S0607937.76D0DStock Option (Right to Buy)27.41332003-12-034M0607927.4133D2003-12-032011-06-01Common Stock60790DThe full per share exercise price of this grant is $27.413333.As of the date of the filing, Mr. Little holds no direct ownership of Iron Mountain Common Stock and holds 45,000 shares indirectly. The indirectly held shares are held by Mr. Little as a beneficiary of the Little Family Trust.Mr. Little has exercised 6,079 shares of the NQ stock option granted to him on 6/1/01. There is no balance of unexercised option shares remaining on this stock option.Garry B. Watzke, under Power of Attorney dated November 14, 2002 from Arthur D. Little2003-12-03