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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(Print or Type Responses)

1. Name and Address of Reporting Person *   Kidd Mark 2. Date of Event Requiring Statement (Month/Day/Year) 02/14/2018 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) SVP, GM Data Centers 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) Common Stock, par value $.01 per share 1,339 D Â

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	538	$ (2)	D	Â
Restricted Stock Units	  (3)	  (3)	Common Stock	1,379	$ (2)	D	Â
Restricted Stock Units	  (4)	  (4)	Common Stock	6,756	$ (2)	D	Â
Restricted Stock Units	  (5)	  (5)	Common Stock	2,027	$ (2)	D	Â
Employee Stock Option (Right to Buy)	  (6)	02/13/2024	Common Stock	1,376	$ 24.8	D	Â
Employee Stock Option (Right to Buy)	  (7)	02/19/2025	Common Stock	4,458	$ 38.83	D	Â
Employee Stock Option (Right to Buy)	  (8)	03/09/2026	Common Stock	7,306	$ 31.46	D	Â
Employee Stock Option (Right to Buy)	  (9)	02/16/2027	Common Stock	6,839	$ 37	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kidd Mark C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON, MA 02110	Â	Â	  SVP, GM Data Centers	Â

Signatures

/s/ Elizabeth Tammaro, under Power of Attorney dated February 13, 2018 from Mark Kidd		02/20/2018
**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"), representing a contingent right to receive a total of 1,609 shares of Iron Mountain Incorporated common stock ("Common Stock"), were granted to the Reporting Person on February 19, 2015. As of February 14, 2018, 1,071 of the granted RSUs have vested, and the balance of the RSUs vest on February 19, 2018.
(2)	Each RSU represents a contingent right to receive one share of Common Stock.
(3)	The RSUs, representing a contingent right to receive a total of 2,066 shares of Common Stock, were granted to the Reporting Person on March 9, 2016. As of February 14, 2018, 687 of the granted RSUs have vested, and the balance of the RSUs vest in two substantially equal annual installments beginning on the second anniversary of the grant date.
(4)	The RSUs, representing a contingent right to receive a total of 6,756 shares of Common Stock, were granted to the Reporting Person on February 16, 2017. As of February 14, 2018, none of the RSUs have vested, and the RSUs vest 25% on the second anniversary of the grant date, 25% on the third anniversary of the grant date and 50% on the fourth anniversary of the grant date.
(5)	The RSUs, representing a contingent right to receive a total of 2,027 shares of Common Stock, were granted to the Reporting Person on February 16, 2017. As of February 14, 2018, none of the RSUs have vested, and the RSUs vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
(6)	This stock option was granted on February 13, 2014. As of February 14, 2018, this stock option has fully vested and has been exercised with respect to 2,743 shares out of 4,119 shares originally granted.
(7)	This stock option was granted on February 19, 2015. As of February 14, 2018, this stock option has vested with respect to 2,969 shares. The remaining shares vest on the third anniversary of the grant date.
(8)	This stock option was granted on March 9, 2016. As of February 14, 2018, this stock option has vested with respect to 2,432 shares. The remaining shares vest in two substantially equal annual installments beginning on the second anniversary of the grant date.
(9)	This stock option was granted on February 16, 2017. As of February 14, 2018, this stock option will vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

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