Ownership Submission
FORM 5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Form 3 Holdings Reported
Form 4 Transactions Reported
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL 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
OMB APPROVAL
OMB Number: 3235-0362
Expires: January 31, 2005
Estimated average burden hours per response... 1.0

1. Name and Address of Reporting Person *
LITTLE ARTHUR D
 2. Issuer Name and Ticker or Trading Symbol
IRON MOUNTAIN INC [IRM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)

P.O. BOX 166, HUNTRESS BRIDGE ROAD		 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2006
(Street)


S. EFFINGHAM, NH 03882		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Reporting
(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 at end of Issuer's Fiscal Year
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Amount (A) or (D) Price
Common Stock, par value, $01.per share             37,500 (1) I Shares held by the Little Family Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. 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 control number. SEC 2270 (9-02)

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 at End of Issuer's Fiscal Year
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
(A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 19.6178 12/29/2006   J 3,398     (2) 05/26/2014 Common Stock
10,195
$ 0 10,195
D
 
Stock Option (Right to Buy) $ 24.6033 (3) 12/29/2006   J 2,641     (4) 05/24/2016 Common Stock
7,923
$ 0 7,923
D
 

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
LITTLE ARTHUR D
P.O. BOX 166
HUNTRESS BRIDGE ROAD
S. EFFINGHAM, NH 03882		   X      

Signatures

Arthur D. Little 02/12/2007
**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) The Common Stock of Iron Mountain Incorporated split, December 29, 2006 3-for-2 to record holders as of December 18, 2006, resulting in the reporting person's acquisition of 12,500 shares of Common Stock. Due to an administrative error, the total number of Iron Mountain Common Stock held indirectly by Mr. Little as part of The Little Family Trust prior to the 3-for-2 stock split, effective December 29, 2006 should be 25,000.
(2) This stock option was previously reported as covering 6,797 shares at an exercise price of $29.4267 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 8,496 shares that are vested.
(3) Due to software limitations, the post stock split exercise price should be $24.6033333.
(4) This stock option was previously reported as covering 5,282 shares at an exercise price of $36.9050 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are no shares that are vested.

Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.