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 * MacLean Theodore   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) EVP, Adjacent Businesses (Last) (First) (Middle) C/O IRON MOUNTAIN INCORPORATED, ONE FEDERAL STREET 3. Date of Earliest Transaction (Month/Day/Year) 02/15/2018 (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 02/15/2018   S(1)   1,345 D $ 33.43 5,839 D   Common Stock, par value $.01 per share 02/16/2018   M   1,619 (2) A $ 0 7,458 D   Common Stock, par value $.01 per share 02/16/2018   F   562 D $ 33.17 6,896 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

Employee Stock Option (Right to Buy)

$ 33.72

02/15/2018

A

24,889

(3)

02/15/2028

Common Stock

24,889

$ 0

24,889

D

Restricted Stock Units

(4)

02/15/2018

A

5,338

(5)

(5)

Common Stock

5,338

$ 0

5,338

D

Restricted Stock Units

(4)

02/16/2018

M

1,619

(6)

(6)

Common Stock

1,619

$ 0

3,245

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MacLean Theodore C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON, MA 02110			EVP, Adjacent Businesses

Signatures

/s/ Elizabeth Tammaro, under Power of Attorney dated May 26, 2016, from Theodore MacLean		02/20/2018
**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 transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of September 7, 2017.
(2)	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on February 16, 2017.
(3)	This stock option becomes exercisable in three substantially equal annual installments beginning on the first anniversary of the grant date.
(4)	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
(5)	The RSUs vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
(6)	The RSUs, representing a contingent right to receive a total of 4,864 shares of Common Stock, were granted to the Reporting Person on February 16, 2017 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

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