FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   Sweeney Eileen 2. Date of Event Requiring Statement (Month/Day/Year) 04/02/2015 3. Issuer Name and Ticker or Trading Symbol IRON MOUNTAIN INC [IRM] (Last) (First) (Middle) C/O IRON MOUNTAIN INCORPORATED, ONE FEDERAL STREET 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr VP and GM, Data Management 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) BOSTON, MA 02110 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	  (1)	  (1)	Common Stock	21,088	$ (2)	D	Â
Restricted Stock Units	  (3)	  (3)	Common Stock	6,326	$ (2)	D	Â
Restricted Stock Units	  (4)	  (4)	Common Stock	5,794	$ (2)	D	Â
Employee Stock Option (Right to Buy)	  (5)	10/28/2024	Common Stock	13,475	$ 35.565	D	Â
Employee Stock Option (Right to Buy)	  (6)	02/19/2025	Common Stock	16,049	$ 38.83	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Sweeney Eileen C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON, MA 02110	Â	Â	  Sr VP and GM, Data Management	Â

Signatures

/s/ Sarah Cammarata, under Power of Attorney dated April 9, 2015, from Eileen Sweeney		04/13/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	The restricted stock units ("RSUs") were granted to the Reporting Person on October 28, 2014 and vest in four substantially equal annual installments beginning on the first anniversary of the grant date.
(2)	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock.
(3)	The RSUs were granted to the Reporting Person on October 28, 2014 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
(4)	The RSUs were granted to the Reporting Person on February 19, 2015 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
(5)	This option vests in three substantially equal installments on October 28, 2015, October 28, 2016 and October 28, 2017.
(6)	This option vests in three substantially equal installments on February 19, 2016, February 19, 2017 and February 19, 2018.

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