Ownership Submission
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 OF SECURITIES

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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(Print or Type Responses)
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 (Month/Day/Year)
03/11/2013
(Street)

BOSTON, MA 02199
4. If Amendment, Date Original Filed(Month/Day/Year)
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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)
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, MA 02199
  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:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(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.

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