Sec Form 4 Filing - REESE C RICHARD @ IRON MOUNTAIN INC - 2013-03-11

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person REESE C RICHARD 2. Issuer Name and Ticker or Trading Symbol IRON MOUNTAIN INC [ IRM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Executive Chairman (Last) (First) (Middle) 100 BELVIDERE STREET APARTMENT 9F 3. Date of Earliest Transaction (MM/DD/YY) 03/11/2013 (Street) BOSTON, MA02199 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $.01 per share 03/11/2013 A 28,532 ( 1 ) A $ 0 399,164 D Common Stock, par value $.01 per share 03/11/2013 F 9,480 D $ 35.31 389,684 D Common Stock, par value $.01 per share 2,891,381.553 ( 2 ) ( 3 ) I By Contract Common Stock, par value $.01 per share 280,152 I See Footnote ( 4 ) Common Stock, par value $.01 per share 1,330,625 I See Footnote ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (M M/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 6 ) 03/11/2013 D 28,532 ( 7 ) ( 7 ) Common Stock 28,532 $ 0 57,151 D Performance Units ( 8 ) 03/13/2013 A 76,600 ( 9 ) ( 10 ) ( 10 ) Common Stock 76,600 $ 0 76,600 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other REESE C RICHARD 100 BELVIDERE STREET APARTMENT 9F BOSTON, MA02199 X Executive Chairman Signatures /s/ Garry B. Watzke, under Power of Attorney dated September 16, 2010 from C. Richard Reese 03/13/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person. ( 2 )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. ( 3 )Benefits pursuant to this arrangement are payable in cash or, at the Reporting Person's election, Iron Mountain Incorporated common stock ("Common Stock"). ( 4 )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. ( 5 )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. ( 6 )Each RSU represents a contingent right to receive one share of Common Stock. ( 7 )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. ( 8 )Each performance unit ("PU") represents a contingent right to receive one share of Common Stock. ( 9 )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. ( 10 )The PUs fully vest on March 9, 2015, subject to certain exceptions.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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