X0202 4 2005-05-31 0001020569 IRON MOUNTAIN INC/PA IRM 0001319944 Radtke Kenneth F Jr IRON MOUNTAIN EUROPE LIMITED THIRD FLOOR COTTONS CENTRE TOOLEY STREET LONDON X0 SE1 2TT UNITED KINGDOM 0 1 0 0 Pres. Iron Mountain Europe Common Stock, par value, $.01 per share 1393 D This includes 114 shares that were acquired by Mr. Kenneth Radtke on May 31, 2005 under the Iron Mountain Employee Stock Purchase Plan. Clare A. Dever, under Power of Attorney dated March 7, 2005. 2005-06-08