X0101 42003-05-02 0001020569 IRON MOUNTAIN INC/PA IRM0001183339 LITTLE ARTHUR D 1000Common Stock, par value $.01 per share2003-05-024M0552518.1111A5525DCommon Stock, par value $0.01 per share2003-05-024S0552537.5D0DStock Option (Right to Buy)18.11112003-05-024M0552518.1111D2003-05-022008-05-27Common Stock55250DThe full per share exercise price of this grant is $18.1111111.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 5,525 shares of the NQ stock option granted to him on 5/28/98. There are no further shares outstanding on this option.Clare A. Dever, under Power of Attorney dated November 14, 2002 from Arthur D. Little2003-05-08