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 *   McIntosh Greg W 2. Date of Event Requiring Statement (Month/Day/Year) 03/01/2019 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) EVP, Strategic Accounts 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 127 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	637	$ (2)	D	Â
Restricted Stock Units	  (3)	  (3)	Common Stock	678	$ (2)	D	Â
Restricted Stock Units	  (4)	  (4)	Common Stock	1,663	$ (2)	D	Â
Restricted Stock Units	  (5)	  (5)	Common Stock	1,435	$ (2)	D	Â
Employee Stock Option (Right to Buy)	  (6)	03/09/2026	Common Stock	6,744	$ 31.46	D	Â
Employee Stock Option (Right to Buy)	  (7)	02/16/2027	Common Stock	6,839	$ 37	D	Â
Employee Stock Option (Right to Buy)	  (8)	02/15/2028	Common Stock	4,009	$ 33.72	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
McIntosh Greg W C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON, MA 02110	Â	Â	  EVP, Strategic Accounts	Â

Signatures

/s/ Elizabeth Tammaro, under Power of Attorney dated February 26, 2019 from Greg McIntosh		03/11/2019
**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 1,907 shares of Iron Mountain Incorporated common stock ("Common Stock"), were granted to the Reporting Person on March 9, 2016. As of March 1, 2019, 1,270 of the granted RSUs have vested, and the balance of the RSUs vest on March 9, 2019.
(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 2,027 shares of Common Stock, were granted to the Reporting Person on Febrauary 16, 2017. As of March 1, 2019, 1,349 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 2,493 shares of Common Stock, were granted to the Reporting Person on October 17, 2017. As of March 1, 2019, 830 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.
(5)	The RSUs, representing a contingent right to receive a total of 2,150 shares of Common Stock, were granted to the Reporting Person on February 15, 2018. As of March 1, 2019, 715 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.
(6)	This stock option was granted on March 9, 2019. As of March 1, 2019, this stock option has vested with respect to 4,491 shares. The remaining shares vest on the third anniversary of the grant date.
(7)	This stock option was granted on February 16, 2017. As of March 1, 2019, this stock option has vested with respect to 4,554 shares. The remaining shares vest on the third anniversary of the grant date.
(8)	This stock option was granted on February 15, 2018. As of March 1, 2019, this stock option has vested with respect to 1,334 shares. The remaining shares vest in two substantially equal annual installments beginning on the second anniversary of the grant date.

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