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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1. Name and Address of Reporting Person * Day Roderick   2. Issuer Name and Ticker or Trading Symbol IRON MOUNTAIN INC [IRM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) C/O IRON MOUNTAIN INCORPORATED, ONE FEDERAL STREET 3. Date of Earliest Transaction (Month/Day/Year) 03/16/2015 (Street) BOSTON, MA 02110 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 03/16/2015   M   565 (1) A $ 0 11,426 D   Common Stock, par value $.01 per share 03/16/2015   F   265 D $ 37.38 11,161 D   Common Stock, par value $.01 per share 03/16/2015   M   3,122 (2) A $ 0 14,283 D   Common Stock, par value $.01 per share 03/16/2015   F   1,467 D $ 37.38 12,816 D

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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

(3)

03/16/2015

M

565

(4)

(4)

Common Stock

565

$ 0

569

D

Restricted Stock Units

(3)

03/16/2015

M

3,122

(5)

(5)

Common Stock

3,122

$ 0

6,258

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Day Roderick C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON, MA 02110			Chief Financial Officer

Signatures

/s/ Sarah Cammarata, under Power of Attorney dated October 11, 2013, from Roderick Day		03/18/2015
**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 on March 15, 2013.
(2)	This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 14, 2014.
(3)	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
(4)	The RSUs, representing a contingent right to receive a total of 1,657 shares of Common Stock, were granted to the Reporting Person on March 15, 2013 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 4, 2014 in connection with the special distribution declared by the Board of Directors of Iron Mountain Incorporated on September 15, 2014 and paid on November 4, 2014 (the "Special Distribution").
(5)	The RSUs, representing a contingent right to receive a total of 9,380 shares of Common Stock, were granted to the Reporting Person on March 14, 2014 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 4, 2014 in connection with the Special Distribution.

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