Sec Form 4 Filing - Duale Marc A @ IRON MOUNTAIN INC - 2017-03-02

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 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Duale Marc A 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) President, Iron Mountain Int. (Last) (First) (Middle) THIRD FLOOR, COTTONS CENTRE,, TOOLEY STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/02/2017 (Street) LONDON, X0SE1 2TT 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 03/02/2017( 1 ) M 11,347 A $ 22.0356 55,385 D Common Stock, par value $.01 per share 03/02/2017( 1 ) F 7,054 D $ 36.32 48,331 D Common Stock, par value $.01 per share 03/02/2017( 1 ) M 8,783 A $ 24.8037 57,114 D Common Stock, par value $.01 per share 03/02/2017( 1 ) F 6,099 D $ 36.32 51,015 D Common Stock, par value $.01 per share 03/31/2017 M 1,936 ( 2 ) A $ 0 52,951 D Common Stock, par value $.01 per share 03/31/2017 F 109 D $ 35.39 52,842 D Common Stock, par value $.01 per share 03/31/2017 M 8,532 ( 3 ) A $ 0 61,374 D Common Stock, par value $.01 per share 03/31/2017 F 430 D $ 35.39 60,944 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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) $ 22.0356 03/02/2017( 1 ) M 11,347 ( 4 ) 03/01/2019 Common Stock 11,347 $ 0 0 D Employee Stock Option (Right to Buy) $ 24.8037 03/02/2017( 1 ) M 8,783 ( 5 ) 02/13/2024 Common Stock 8,783 $ 0 0 D Restricted Stock Units ( 6 ) 03/31/2017 M 1,936 ( 7 ) ( 7 ) Common Stock 1,936 $ 0 0 D Restricted Stock Units ( 6 ) 03/31/2017 M 8,532 ( 8 ) ( 8 ) Common Stock 8,532 $ 0 8,559 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Duale Marc A THIRD FLOOR, COTTONS CENTRE, TOOLEY STREET LONDON, X0SE1 2TT President, Iron Mountain Int. Signatures /s/ Elizabeth Tammaro, under Power of Attorney dated May 26, 2016, from Marc A. Duale 04/03/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This report is being filed late due to an administrative error by a third party broker firm that is the administrator of this transaction. ( 2 )This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on February 19, 2015. ( 3 )This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 18, 2016. ( 4 )This stock option, representing a right to purchase a total of 113,451 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on October 18, 2012 made in connection with a special dividend declared by the Board of Directors of the Issuer and on September 26, 2014 made in connection with the special distribution declared by the Board of Directors of the Issuer (the "Special Distribution"). ( 5 )This stock option, representing a right to purchase a total of 26,296 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the Special Distribution. ( 6 )Each RSU represents a contingent right to receive one share of the Issuer's common stock ("Common Stock"). ( 7 )The RSUs, representing a contingent right to receive a total of 5,794 shares of Common Stock, 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. In connection with the Reporting Person's resignation from the Issuer on March 31, 2017, the unvested portion of this RSU award became fully vested. ( 8 )The RSUs, representing a contingent right to receive a total of 25,623 shares of Common Stock, were granted to the Reporting Person on February 18, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date. In connection with the Reporting Person's resignation from the Issuer on March 31, 2017, the unvested portion of this RSU award became partially vested.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Int entional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.