IRON MOUNTAIN INCORPORATED (NYSE:IRM) Files An 8-K Other Events
Item 8.01. Other Events.

On December12, 2017,Iron Mountain Incorporated, or the Company, entered into an underwriting agreement, or the Underwriting Agreement, with J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner& Smith Incorporated, Wells Fargo Securities, LLC, Barclays Capital Inc. and Evercore Group L.L.C., as representatives of the several underwriters named therein, or the Underwriters, relating to the public offering by the Company of 14,500,000 shares, or the Firm Shares, of its common stock, par value $0.01 per share, or Common Stock. The offering price to the public for the Firm Shares is $37.00 per share, and the Company agreed to pay the Underwriters an underwriting commission of $1.38195 per share. to the Underwriting Agreement, the Underwriters have a 30-day option to purchase from the Company up to an additional 2,175,000 shares, or the Option Shares, of Common Stock at the public offering price less the underwriting commission less an amount per share equal to any dividends or distributions declared by the Company and payable on the Firm shares but not payable on the Option Shares.

The offering is being made by the Company to an effective shelf registration statement on FormS-3 (File No.333-209827) on file with the Securities and Exchange Commission, or the SEC. A prospectus supplement relating to the offering has been filed with the SEC. The closing of the offering took place on December15, 2017.

The above description of the Underwriting Agreement is not complete and is subject to and qualified in its entirety by reference to the Underwriting Agreement, a copy of which is attached hereto as Exhibit1.1 and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits