Exhibit 4.3


 




	
  

  	
  THIS CERTIFICATE IS TRANSFERABLE IRON MOUNTAIN  IN JERSEY CITY, NJ, NEW YORK, NY
  INCORPORATED UNDER THE LAWS IRON MOUNTAIN INCORPORATED AND PITTSBURGH, PA OF
  THE STATE OF DELAWARE  CUSIP 462846 10
  6 SEE REVERSE FOR CERTAIN DEFINITIONS This is to Certify that SPECIMEN is the
  owner of FULLY PAID AND NON-ASSESSABLE SHARES, $.01 PAR VALUE OF THE COMMON
  STOCK OF CERTIFICATE OF STOCK Iron Mountain Incorporated, transferable on the
  books of the Corporation in person or by attorney upon surrender of this
  certificate properly endorsed. This certificate and the shares represented
  hereby are subject to the laws of the State of Delaware and to the Articles
  of Incorporation and the By-laws of the Corporation as from line to line
  amended. This certificate is not valid until countersigned and registered by
  the Transfer Agent and Registrar. In Witness Whereof, the Corporation has
  caused its facsimile corporate seal and the facsimile signatures of its duly
  authorized officers to be hereunto affired. Dated COUNTERSIGNED AND
  REGISTERED: THE BANK OF NEW YORK MELLON TRANSFER AGENT AND REGISTRAR BY
  AUTHORIZED SIGNATURE SECRETARY 
  CHAIRMAN AND CHIEF EXECUTIVE OFFICER IRON MOUNTAIN INCORPORATED SEAL
  2002 DELWARE CORPORATE

  






 












	
  

  	
  IRON MOUNTAIN
  INCORPORATED THE CORPORATION IS AUTHORIZED TO ISSUE MORE THAN ONE CLASS OF
  STOCK. THE CORPORATION WILL FURNISH TO THE HOLDER HEREOF, UPON REQUEST AND
  WITHOUT CHARGE, (i) A FULL OR SUMMARY STATEMENT OF THE DESIGNATIONS, VOTING
  RIGHTS, PREFERENCES, LIMITATIONS AND SPECIAL RIGHTS OF THE SHARES OF EACH
  CLASS OR SERIES AUTHORIZED TO BE ISSUED BY THE CORPORATION SO FAR AS THE SAME
  HAVE BEEN FIXED AND DETERMINED, AND (ii) THE AUTHORITY OF THE BOARD OF
  DIRECTORS OF THE CORPORATION TO FIX AND DETERMINE SUCH RIGHTS AND
  DESIGNATIONS. The following abbreviations, when used in the inscription on
  the face of this certificate, shall be construed as though they were written
  out in full according to applicable laws or regulations: TEN COM — as tenants
  in common UNIF GIFT MIN ACT—Custodian (Cust) (Minor) TEN ENT - as tenants by
  the entireties JTTEN — as joint tenants with right of survivorship and not as
  tenants in common under Uniform Gifts to Minors Act (State) Additional
  abbreviations may also be used though not in the above For value received
  hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF
  ASSIGNEE of the capital stock represented by the within Certificate, and do
  hereby irrevocably constitute and appoint Attorney to transfer the said stock
  on the books of the within-named Corporation with full power of substitution
  in the premises. Dated, NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST
  CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
  PARTICULAR WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.
  Signature(s) Guaranteed: THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE
  GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND
  CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION
  PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15. This certificate also evidences
  and entitles the holder hereof to the same number of Rights (subject to
  adjustment) equal to the number of shares of common stock represented by this
  certificate, such Rights being on the terms set forth in the Rights Agreement
  by and between Iron Mountain Incorporated (the “Corporation”) and Mellon
  Investor Services LLC (operating with the service name “BNY Mellon Shareowner
  Services”) (the “Rights Agent”), dated as of March 23, 2011, as it may be
  amended from time to time (the “Agreement”), the terms of which are
  incorporated herein by reference and a copy of which is on file at the
  principal executive offices of the Corporation. Under certain circumstances,
  as set forth in the Agreement, such Rights may be redeemed, may become
  exercisable for securities or assets of the Corporation, or securities of
  another entity, may be exchanged for shares of Common Stock or other
  securities or assets of the Corporation or may expire. Under certain
  circumstances, as set forth in the Agreement, such Rights shall be evidenced
  by separate certificates and shall no longer be evidenced by this certificate.
  The Corporation shall mail to the registered holder of this certificate a
  copy of the Agreement without charge within five (5) days after receipt of a
  written request therefor. As provided in Section 7(e) of the Agreement,
  Rights issued to or Beneficially Owned by Acquiring Persons or their
  Affiliates or Associates (as such terms are defined in the Agreement) or any
  subsequent holder of such Rights shall be null and void and may not be
  exercised by or transferred to any Person. list. Shares