This Current Report on Form 8-K is being filed by Iron Mountain Incorporated, or the Company, to clarify the Company’s disclosure regarding board of directors and committee meeting attendance contained on page 16 of the Company’s Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on April 13, 2017 relating to the Company’s 2017 annual meeting of stockholders.

The Company wishes to clarify that in 2016, each incumbent director attended at least 75% of the aggregate number of meetings of the Company’s board of directors and all committees thereof on which such director served that were held during the period for which such director served. The clarification is to specify that each of Mr. Neil Chatfield and Ms. Wendy Murdock met the 75% attendance threshold during the period for which they served on the board of directors.

IRON MOUNTAIN INCORPORATED (NYSE:IRM) Recent Trading Information

IRON MOUNTAIN INCORPORATED (NYSE:IRM) closed its last trading session up +0.28 at 35.08 with 836,781 shares trading hands.