IRON MOUNTAIN INC — Director's Dealing 2013

Mar 13, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2013-03-11

Reporting Person: REESE C RICHARD (Director, Executive Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-11	Common Stock, par value $.01 per share	A	28532	—	Acquired	399164	Direct
2013-03-11	Common Stock, par value $.01 per share	F	9480	$35.31	Disposed	389684	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-11	Restricted Stock Units	$	D	28532	Disposed		Common Stock (28532)	Direct
2013-03-13	Performance Units	$	A	76600	Acquired		Common Stock (76600)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $.01 per share	2891381.553	Indirect
Common Stock, par value $.01 per share	280152	Indirect
Common Stock, par value $.01 per share	1330625	Indirect

Footnotes

F1: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person.

F2: The Reporting Person shares beneficial ownership of these shares with Schooner Capital Corporation as a result of a 1988 deferred compensation arrangement, as amended, between Schooner Capital LLC ("Schooner") and the Reporting Person relating to the Reporting Person's former services as President of the predecessor corporation to Schooner (the "Arrangement"). Pursuant to the Arrangement, the Reporting Person is entitled to receive benefits equivalent to the fair market value of such shares with payments to the Reporting Person commencing on the first business day of 2014 and payable in nine annual installments; however, the Reporting Person has the right to defer the commencement of such installments in certain circumstances. In addition, any unpaid benefits pursuant to this arrangement shall be payable to the Reporting Person's beneficiary(ies) in a lump sum upon his death.

F3: Benefits pursuant to this arrangement are payable in cash or, at the Reporting Person's election, Iron Mountain Incorporated common stock ("Common Stock").

F4: These shares are held by the GST Trust. The Reporting Person disclaims beneficial ownership of the GST Trust, and this report should not be deemed an admission that the Reporting Person is beneficial owner of such securities for the purposes of Section 16 of the Exchange Act of 1934, as amended, or for any purpose.

F5: These shares are held by the Reese Family 2005 LLC (the "LLC"). The Reporting Person disclaims beneficial ownership of all securities held by the LLC, 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 Exchange Act of 1934, as amended, or for any purpose.

F6: Each RSU represents a contingent right to receive one share of Common Stock.

F7: The RSUs, representing a contingent right to receive a total of 85,683 shares of Common Stock, were granted to the Reporting Person on March 9, 2012 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date. The number of RSUs granted includes previously reported RSUs allocated on November 21, 2012 in connection with the Reporting Person's receipt of his pro rata portion of a special dividend declared by the Board of Directors of Iron Mountain Incorporated on October 11, 2012 and paid on November 21, 2012.

F8: Each performance unit ("PU") represents a contingent right to receive one share of Common Stock.

F9: The PUs were previously granted to the Reporting Person on March 9, 2012, and on March 13, 2013 the Compensation Committee of Iron Mountain Incorporated's Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period.

F10: The PUs fully vest on March 9, 2015, subject to certain exceptions.