IRON MOUNTAIN INC /DE
POS AM, 2000-05-01
PUBLIC WAREHOUSING & STORAGE
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       As filed with the Securities and Exchange Commission on May 1, 2000
                                                      Registration No. 333-44187


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             -----------------------

                         POST-EFFECTIVE AMENDMENT NO. 1

                                       to

                                    FORM S-4


             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             -----------------------


                         IRON MOUNTAIN INCORPORATED (1)

             (Exact name of registrant as specified in its charter)
                             -----------------------


           Delaware                         4226                  04-3107342
(State or other jurisdiction of      (Primary Standard        (I.R.S. Employer
incorporation or organization)    Industrial Classification  Identification No.)
                                      Code Number)

                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                 (617) 535-4766
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)
                              ---------------------
                                C. Richard Reese
                       Chairman of the Board of Directors
                           and Chief Executive Officer
                           Iron Mountain Incorporated
                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                 (617) 535-4766
 (Name, address, including zip code, telephone number, including area code,
                             of agent for service)
                              ---------------------
                                    Copy to:
                           Susan Forest Barrett, Esq.
                            Sullivan & Worcester LLP
                             One Post Office Square
                           Boston, Massachusetts 02109
                                 (617) 338-2800
                              ---------------------



Approximate date of commencement of proposed sale to the public:  N/A.

If the securities  being registered on this Form are being offered in connection
with the  formation of a holding  company and there is  compliance  with General
Instruction G, check the following box. |_|

If this form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the  Securities  Act,  check the following box and list the
Securities  Act  registration   statement   number  of  the  earlier   effective
registration statement for the same offering. |_|

If this form is a  post-effective  amendment filed pursuant to Rule 462(d) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_|

- -------------------
(1) On February 1, 2000,  Iron  Mountain  Incorporated,  a Delaware  corporation
("Old Iron  Mountain"),  merged with and into Pierce Leahy Corp., a Pennsylvania
corporation  ("Pierce Leahy").  Pierce Leahy survived the merger and immediately
changed its name to "Iron Mountain  Incorporated,"  a  Pennsylvania  corporation
("New Iron Mountain"). This Post-Effective Amendment No. 1 is being filed by New
Iron Mountain on behalf of Old Iron Mountain.
<PAGE>



                         Deregistration of Common Stock

     On January 13, 1998, Old Iron Mountain  filed a  Registration  Statement on
Form S-4  (Registration No. 333-44187) for the sale of an aggregate of 1,500,000
shares (as adjusted for a 3 for 2 stock split in July 1998) of common stock, par
value $.01 per share,  of Old Iron  Mountain  ("Common  Stock").  On February 1,
2000, Old Iron Mountain merged with and into Pierce Leahy.  Pursuant to Old Iron
Mountain's  undertaking  in  the  Registration  Statement,  this  Post-Effective
Amendment  No. 1 is  being  filed by New Iron  Mountain  on  behalf  of Old Iron
Mountain to  deregister  all shares of Common Stock  registered  pursuant to the
Registration  Statement but remaining unsold as of the date this  Post-Effective
Amendment No. 1 is filed.




<PAGE>



                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant  has  duly  caused  this4  Post-Effective  Amendment  No.  1  to  the
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Boston, Commonwealth of Massachusetts, on May 1,
2000.

                                      IRON MOUNTAIN INCORPORATED


                                      By: /s/ C. Richard Reese
                                           C. Richard Reese
                                           Chairman and Chief Executive Officer

     Pursuant to the  requirements  of the  Securities  Act of 1933, as amended,
this  Post-Effective  Amendment  No. 1 to the  Registration  Statement  has been
signed  below  by the  following  persons  in the  capacities  and on the  dates
indicated.
<TABLE>
<CAPTION>

      Signature                                    Title                                           Date

<S>                                     <C>                                                    <C>

 /s/ C. Richard Reese                    Chairman, Chief Executive                               May 1, 2000
C. Richard Reese                         Officer and Director

J. Peter Pierce                          President and Director

 /s/ John F. Kenny, Jr.                  Executive Vice President, Chief                         May 1, 2000
John F. Kenny, Jr.                       Financial Officer and Director

  *                                      Vice President and Corporate                            May 1, 2000
Jean A. Bua                              Controller (principal accounting
                                         officer)

  *                                      Director                                                May 1, 2000
Clarke H. Bailey

  *                                      Director                                                May 1, 2000
Constantin R. Boden




<PAGE>



  *                                      Director                                                May 1, 2000
Kent P. Dauten

  *                                      Director                                                May 1, 2000
Eugene B. Doggett

  *                                      Director                                                May 1, 2000
B. Thomas Golisano

  *                                      Director                                                May 1, 2000
Arthur D. Little

                                         Director
Howard D. Ross

  *                                      Director                                                May 1, 2000
Vincent J. Ryan


*By:  /s/ C. Richard Reese
     C. Richard Reese
     Attorney-in-Fact pursuant to Power
     of Attorney previously filed as a
     part of this Registration Statement
</TABLE>





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