X0202 5 2004-12-31 0 0 0001020569 IRON MOUNTAIN INC/PA (IRM) 0001032365 REESE C RICHARD 100 BELVEDERE STREET APT. 9F BOSTON MA 02199 1 1 0 0 Chairman of the Board & CEO Common Stock, par value, $.01 per share 2004-12-15 5 G 0 2160 0 D 1476868 D Common Stock, par value, $.01 per share 63744 I In trust for children sharing household Common Stock, par value, $.01 per share 1967059 I By contract Gift of 1,440 shares to trust for the benefit of the reporting person's children and a gift of 720 shares to a trust for the benefit of the reporting person's brother. This total reflects a decrease of 1,715 shares that were previously reported in error on 9/7/04. The reporting person disclaims beneficial ownership of all securities held in trust for the benefit of his children, and this report should not be deemed an admission that the reporting person is beneficial owner of such securities for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, or for any other purpose. Pursuant to a deferred compensation arrangement relating to Mr. Reese's former services as President of Schooner Capital Corporation ("Schooner"), upon the earlier to occur of (i) sale or exchange by Schooner Capital Trust of substantially all of the shares of Iron Mountain Incorporated Common Stock, par value $.01 per share ("Common Stock") held by Schooner Capital Trust and (ii) the cessation of Mr. Reese's employment with Iron Mountain Incorporated, Schooner Capital Trust is required to transfer such shares of Common Stock to Mr. Reese or cash in an amount equal to then current fair market value of such shares of Common Stock. C. Richard Reese 2005-02-04