IRON MOUNTAIN INC /DE
S-4/A, 1998-08-03
PUBLIC WAREHOUSING & STORAGE
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     As filed with the Securities and Exchange Commission on August 3, 1998
                                                      Registration No. 333-44187
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                              --------------------
                                 AMENDMENT NO. 1
                                       TO
                                    FORM S-4
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                              ---------------------
                           IRON MOUNTAIN INCORPORATED
             (Exact name of registrant as specified in its charter)

    DELAWARE                         4226                       04-3107342
(State or other          (Primary Standard Industrial        (I.R.S. Employer
jurisdiction of          Classification Code Number)        Identification No.)
incorporation or
 organization)
                      745 ATLANTIC AVENUE, BOSTON, MA 02111
                                 (617) 357-4455
    (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, MA 02111
                                 (617) 357-4455
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                              --------------------
                                    Copy to:
                           Susan Forest Barrett, Esq.
                            Sullivan & Worcester LLP
                             One Post Office Square
                                Boston, MA 02109
                                 (617) 338-2800

         Approximate  date of commencement of proposed sale to the public:  From
time to time as soon as practicable  after this  Registration  Statement becomes
effective.
         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. |_|

<TABLE>
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE

Title of Each Class of Securities to  Amount to be      Proposed Maximum Offering          Proposed Maximum            Amount of
          be Registered                Registered            Price Per Share           Aggregate Offering Price    Registration Fee
- ----------------------------------  -----------------  ----------------------------  ---------------------------- ------------------
<S>                                   <C>                          <C>                           <C>                      <C>
          Common Stock,               1,337,164 (1)                (2)                           (2)                      (2)
     Par Value $.01 per share
==================================  =================  ============================  ============================ ==================

<FN>
(Footnotes provided on following page)
</FN>
</TABLE>
                             ----------------------
    If, as a result of stock splits,  stock  dividends or similar  transactions,
the  number  of  securities  purported  to be  registered  on this  Registration
Statement  changes,  the provisions of Rule 416 shall apply to this Registration
Statement.
    The  Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant  will
file a  further  amendment  which  specifically  states  that  the  Registration
Statement will  thereafter  become  effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until the Registration Statement will
become effective on such date as the Securities and Exchange Commission,  acting
pursuant to Section 8(a), may determine.
<PAGE>

     (1)  The amount of shares of Common Stock to be registered  was  calculated
          by  subtracting  the  325,672  shares  of Common  Stock  issued by the
          Company in connection with an acquisition from the 1,000,000 shares of
          Common Stock registered  pursuant to the initial filing. The remaining
          674,328  shares of Common  Stock were then  adjusted  to  reflect  the
          Company's three for two stock split effected in the form of a dividend
          on the Company's Common Stock, which resulted in 1,011,492 shares. The
          initial 325,672 shares issued in connection with an acquisition by the
          Company  were  then  added  to the  1,011,492  shares  for a total  of
          1,337,164 shares of Common Stock to be registered.

     (2)  The information  relating to offering price and amount of registration
          fee are left  blank as no fee is  required  because  no new shares are
          being registered.

<PAGE>


                                                      Registration No. 333-44187
PROSPECTUS

                                1,337,164 Shares
                           Iron Mountain Incorporated
                                  Common Stock
                             ----------------------

         This  Prospectus  relates  to the  issuance  from  time to time by Iron
Mountain   Incorporated   (the  "Company"  or  "Iron   Mountain"),   a  Delaware
corporation,  of its  shares of common  stock,  par  value  $.01 per share  (the
"Common Stock"), in an aggregate amount of up to 1,337,164 shares, upon terms to
be determined at the time of each such offering.

         The Common Stock is to be offered directly by the Company in connection
with the  acquisition  of the  assets of, or  ownership  interests  in,  certain
entities  engaged in the same or similar lines of business as the Company or any
of its  subsidiaries.  The consideration for acquisitions will consist of shares
of Common Stock,  cash,  notes or other evidences of  indebtedness,  guarantees,
assumption of  liabilities,  tangible or intangible  property,  or a combination
thereof, as determined from time to time by negotiations between the Company and
the owners or  controlling  persons of the assets or  ownership  interests to be
acquired.  In  addition,  the  Company  may lease  property  from and enter into
management or consulting  agreements  and  non-competition  agreements  with the
former owners and key executive personnel of the businesses to be acquired.

         The  Company  contemplates  that the  terms of an  acquisition  will be
determined by negotiations between the Company's  representatives and the owners
or  controlling  persons of the assets or  ownership  interests  to be acquired.
Factors  taken into  account  in  acquisitions  include,  among  other  relevant
factors,  the quality and reputation of the business,  the assets,  liabilities,
results  of  operations  and cash  flows for the  business,  the  quality of its
management and employees,  its earnings potential,  the geographic  locations of
the  business  and the market  value of the  Common  Stock of the  Company  when
pertinent.  The Company  anticipates  that shares of Common  Stock issued in any
such  acquisition  will be valued at a price  reasonably  related  to the market
value of the Common Stock,  either at the time the terms of the acquisitions are
tentatively  agreed  upon,  or at or about the time of  closing,  or during  the
period or periods prior to delivery of the shares.

         The Company does not expect that underwriting  discounts or commissions
will be paid,  except that finders fees may be paid to persons from time to time
in connection with specific acquisitions. Any person receiving any such fees may
be deemed to be an underwriter within the meaning of the Securities Act of 1933,
as amended (the "Securities Act").

         The Common Stock is traded on the Nasdaq  National  Market System under
the symbol "IMTN." On January 8, 1998 the closing sale price of the Common Stock
on   the    Nasdaq    National    Market    System   was   $35.50   per   share.
                             ----------------------

         See "RISK  FACTORS"  at page 6 for certain  information  that should be
considered by prospective investors.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
       AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
       THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COM-
        MISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
            ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             ----------------------



                The date of this Prospectus is January 20, 1998.



<PAGE>



                              AVAILABLE INFORMATION

         The Company has filed with the Securities and Exchange  Commission (the
"Commission")  in  Washington,  D.C.,  a  registration  statement  on  Form  S-4
(together with all exhibits, schedules and amendments thereto, the "Registration
Statement")  under the  Securities  Act, with respect to the Common Stock.  This
Prospectus,  which is a part of the Registration Statement, does not contain all
of the information set forth in the Registration  Statement.  Statements in this
Prospectus  as to the  contents  of any  contract  or  other  document  are  not
necessarily complete, and in each instance reference is made to the copy of such
contract or other documents filed as an exhibit to the  Registration  Statement,
each such  statement  being  qualified in all respects by such reference and the
exhibits and schedules thereto.  For further information  concerning the Company
and the Common Stock, reference is made to the Registration Statement. Copies of
the Registration  Statement may be obtained from the Commission at its principal
office in Washington, D.C. upon payment of the prescribed fee.

         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  and, in
accordance  therewith,  files reports and other information with the Commission.
The Registration  Statement,  the exhibits and schedules  forming a part thereof
and the reports,  proxy  statements and other  information  filed by the Company
with the Commission can be inspected and copies obtained at the public reference
facilities maintained by the Commission at Judiciary Plaza, Room 1024, 450 Fifth
Street, N.W.,  Washington,  D.C. 20549, and at the following regional offices of
the Commission:  Chicago Regional  Office,  Suite 1400, 500 West Madison Street,
Chicago,  Illinois  60661-2511;  and New York Regional Office, Seven World Trade
Center,  New York,  New York 10048.  Copies of such  material can be obtained at
prescribed  rates from the Public  Reference  Section of the  Commission  at its
principal  office  at 450  Fifth  Street,  N.W.,  Washington,  D.C.  20549.  The
Commission  maintains  a World Wide Web site that  contains  reports,  proxy and
information  statements and other information regarding  registrants,  including
the Company,  that file electronically  with the Commission.  The address of the
site is  http://www.sec.gov.  In addition,  reports,  proxy statements and other
information  concerning  the Company may be  inspected  at the offices of Nasdaq
operations, 1735 K Street N.W., Washington, D.C. 20006.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The  following  documents,  which have been filed by Iron Mountain with
the  Commission  (File No.  0-27584)  pursuant to the  Exchange  Act, are hereby
incorporated  in  this  Prospectus  and  specifically  made  a  part  hereof  by
reference: (i) Annual Report on Form 10-K for the fiscal year ended December 31,
1996 (the "Annual Report"), (ii) Quarterly Reports on Form 10-Q for the quarters
ended March 31,  1997,  June 30, 1997 and  September  30,  1997,  (iii)  Current
Reports on Form 8-K dated June 25, 1997 (as amended August 26, 1997), October 1,
1997,  October  16, 1997 (as  amended  November  10,  1997),  October 30,  1997,
November 25, 1997 and January 13, 1998,  and (iv) the  description of the Common
Stock  contained  in the  Company's  Registration  Statement  on Form 8-A  dated
January 18,  1996.  In addition,  the  financial  information  contained in Iron
Mountain's  Registration  Statements on Form S-4 (i) File No.  333-24635,  filed
with the  Commission  on April 4,  1997,  as  amended on May 7, 1997 and May 13,
1997, as made  effective by the  Commission  on May 14, 1997,  and (ii) File No.
333-41715,  filed with the  Commission on December 8, 1997, as made effective by
the  Commission on December 11, 1997 is  incorporated  herein by reference.  All
documents filed by Iron Mountain  pursuant to Section 13(a),  13(c), 14 or 15(d)
of the Exchange Act  subsequent to the date of this  Prospectus and prior to the
termination  of  the  offering  of  the  Common  Stock  shall  be  deemed  to be
incorporated  by  reference  into the  Registration  Statement  and to be a part
hereof from the respective dates of filing of any such documents.

         Any statement contained herein or in a document  incorporated or deemed
to be  incorporated  herein  by  reference  shall be deemed  to be  modified  or
superseded  for  purposes  of this  Prospectus  to the extent  that a  statement
contained herein (or in the applicable Prospectus  Supplement),  or in any other
subsequently filed document that also is or is deemed to be incorporated  herein
by  reference,  modifies or supersedes  such  statement.  Any such  statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.

                                        2

<PAGE>




         The Company hereby  undertakes to provide without charge to each person
to whom this  Prospectus is delivered,  upon the written or oral request of such
person, a copy of any and all of the information  that has been  incorporated by
reference  in this  Prospectus  (excluding  exhibits  unless such  exhibits  are
specifically incorporated by reference into the information that this Prospectus
incorporates).  Requests  for such  copies  should be made to the Company at its
principal executive offices, 745 Atlantic Avenue,  Boston,  Massachusetts 02111,
Attention:  John F. Kenny,  Jr.,  Executive Vice  President and Chief  Financial
Officer.


                                   THE COMPANY

         Iron  Mountain is America's  largest  records  management  company,  as
measured by its revenues.  The Company is a national,  full-service  provider of
records management and related services, enabling customers to outsource records
management  functions.  Iron Mountain has a  diversified  customer  base,  which
includes  more than half of the  Fortune  500 and  numerous  commercial,  legal,
banking,  healthcare,   accounting,  insurance,   entertainment  and  government
organizations.  The Company  provides storage and related services for all major
media, including paper (the dominant form of record storage),  computer disk and
tapes, microfilm and microfiche,  master audio and video tapes, film and optical
disks, X-rays and blueprints. Iron Mountain's principal services provided to its
storage  customers include courier pick-up and delivery,  filing,  retrieval and
destruction of records,  database management,  customized reporting and disaster
recovery  support.  The  Company  also  sells  storage  materials  and  provides
consulting,  facilities  management,  information  technology staffing and other
outsourcing services.

         Iron Mountain was  incorporated in Delaware in 1990 but its predecessor
operations date from 1951. The principal  executive  officers of the Company are
located at 745 Atlantic  Avenue,  Boston,  Massachusetts  02111.  Its  telephone
number is (617) 357-4455.


                                        3

<PAGE>
            SELECTED CONSOLIDATED FINANCIAL AND OPERATING INFORMATION
                    (In thousands, except per share amounts)

         The  following  selected  consolidated  statements  of  operations  and
balance sheet data of the Company as of and for each of the years ended December
31, 1992, 1993, 1994, 1995 and 1996 have been derived from the Company's audited
consolidated  financial  statements.  The selected  consolidated  statements  of
operations  and balance  sheet data of the  Company  for the nine  months  ended
September  30,  1996 and 1997 have been  derived  from the  Company's  unaudited
condensed consolidated  financial statements.  The Company's unaudited condensed
consolidated financial statements include all adjustments,  consisting of normal
recurring accruals, that the Company considers necessary for a fair presentation
of the  financial  position  and the results of  operations  for those  periods.
Operating  results  for  the  nine  months  ended  September  30,  1997  are not
necessarily  indicative  of the results for the entire year ending  December 31,
1997. The selected  consolidated  financial and operating  information set forth
below should be read in conjunction with Iron Mountain's  Consolidated Financial
Statements  and  the  Notes  thereto   incorporated  by  reference  herein.  See
"Incorporation of Certain Documents by Reference."


<TABLE>
<CAPTION>
                                                                                                  Nine Months
                                                         Year Ended December 31,               Ended September 30,
                                             -----------------------------------------------   ------------------
                                               1992     1993     1994      1995      1996       1996      1997
                                             --------  -------  -------  --------- ---------   -------  ---------
<S>                                           <C>      <C>      <C>       <C>       <C>        <C>       <C>      
Consolidated Statements of Operations Data:
Revenues:
   Storage.................................   $44,077  $48,892  $54,098   $ 64,165  $ 85,826   $61,419   $ 86,199
   Service and Storage Material Sales......    26,596   32,781   33,520     40,271    52,892    38,550     57,195
                                             --------  -------  -------  --------- ---------   -------  ---------
        Total Revenues.....................    70,673   81,673   87,618    104,436   138,718    99,969    143,394
Operating Expenses:
   Cost of Sales (Excluding Depreciation)..    35,169   43,054   45,880     52,277    70,747    51,091     73,742
   Selling, General and Administrative.....    17,630   19,971   20,853     26,035    34,342    24,762     35,682
   Depreciation and Amortization...........     5,780    6,789    8,690     12,341    16,936    11,896     18,495
                                             --------  -------  -------  --------- ---------   -------  ---------
        Total Operating Expenses...........    58,579   69,814   75,423     90,653   122,025    87,749    127,919
                                             --------  -------  -------  --------- ---------   -------  ---------
Operating Income...........................    12,094   11,859   12,195     13,783    16,693    12,220     15,475
Interest Expense...........................     8,412    8,203    8,954     11,838    14,901     9,981     17,631
                                             --------  -------  -------  --------- ---------   -------  ---------
Income (Loss) Before Provision (Credit) for
   Income Taxes............................     3,682    3,656    3,241      1,945     1,792     2,239     (2,156)
Provision (Credit) for Income Taxes........     2,095    2,088    1,957      1,697     1,435     1,542       (346)
                                             --------  -------  -------  --------- ---------   -------  ---------
Income (Loss) Before Extraordinary Charge..     1,587    1,568    1,284        248       357       697     (1,810)
Extraordinary Charge, Net of Tax Benefit (1)       --       --       --         --     2,216        --         --
                                             --------  -------  -------  --------- ---------   -------  ---------
Net Income (Loss)..........................     1,587    1,568    1,284        248    (1,769)      697     (1,810)
Accretion of Redeemable Put Warrant........       626      940    1,412      2,107       280       280         --
                                             --------  -------  -------  --------- ---------   -------  ---------
Net Income (Loss) Applicable to Common                                    
   Stockholders............................   $   961  $   628  $  (128)  $ (1,859) $ (2,049)  $   417   $ (1,810)
                                             ========  =======  =======  ========= =========   =======  =========
Income (Loss) Before Extraordinary Item per
   Common and Common Equivalent Share......   $  0.12  $  0.08  $ (0.02)  $  (0.24) $   0.01   $  0.04   $  (0.17)
Net Income (Loss) per Common and Common
   Equivalent Share........................   $  0.12  $  0.08  $ (0.02)  $  (0.24) $  (0.20)  $  0.04   $  (0.17)
Weighted Average Common and Common
   Equivalent Shares Outstanding...........     8,052    8,067    7,984      7,784    10,137    10,101     10,906

Other Data:
EBITDA (2).................................   $17,874  $18,648  $20,885   $ 26,124  $ 33,629   $24,116   $ 33,970
EBITDA as a Percentage of Total Revenues...      25.3%    22.8%    23.8%      25.0%     24.2%     24.1%      23.7%
Capital Expenditures:
   Growth (3)(4)...........................   $11,226  $13,605  $15,829   $ 14,395  $ 23,334   $16,610   $ 20,074
   Maintenance.............................       818    1,846    1,151        858     1,112       803        544
                                             --------  -------  -------  --------- ---------   -------  ---------
Total Capital Expenditures (4).............   $12,044  $15,451  $16,980   $ 15,253  $ 24,446   $17,413   $ 20,618
                                             ========  =======  =======  ========= =========   =======  =========
Additions to Customer Acquisition Costs....   $ 1,268  $   922  $ 1,366   $  1,379  $  1,642   $ 1,265   $    688

(continued on next page)

                                        4
<PAGE>






<CAPTION>
                                                                                                        As of
                                                                As of December 31,                  September 30,
                                            --------------------------------------------------------
                                               1992        1993       1994       1995        1996        1997
                                            ----------  ---------- ----------  ---------  ----------  ----------
<S>                                           <C>         <C>        <C>        <C>         <C>         <C>
Consolidated Balance Sheet Data:
Cash and Cash Equivalents..................   $    498    $    591   $  1,303   $  1,585    $  3,453    $  2,242
Total Assets...............................    115,429     125,288    136,859    186,881     281,799     451,099
Total Debt.................................     73,304      78,460     86,258    121,874     184,733     274,368
Stockholders' Equity.......................     23,419      24,047     22,869     21,011      52,384     113,945
- ---------------

<FN>
(footnotes from the preceding page)
(1) The  extraordinary  charge for 1996  consists of a prepayment  penalty,  the
    write-off of deferred  financing costs,  original issue discount and loss on
    termination of interest rate protection agreements.
(2) Based on its  experience  in the records  management  industry,  the Company
    believes that earnings before interest,  taxes,  depreciation,  amortization
    and  extraordinary  items  ("EBITDA") is an important tool for measuring the
    performance of records management companies (including potential acquisition
    targets) in several  areas,  such as liquidity,  operating  performance  and
    leverage.  In  addition,  lenders  use EBITDA as a criterion  in  evaluating
    records  management  companies,  and  substantially  all  of  the  Company's
    financing  agreements contain covenants in which EBITDA is used as a measure
    of  financial  performance.  However,  EBITDA  should not be  considered  an
    alternative  to operating or net income (as  determined in  accordance  with
    GAAP) as an  indicator  of the  Company's  performance  or to cash flow from
    operations  (as  determined  in  accordance  with  GAAP)  as  a  measure  of
    liquidity.
(3) Growth capital  expenditures  include  investments in racking  systems,  new
    buildings  and  leasehold   improvements,   equipment  for  new  facilities,
    management information systems and facilities restructuring.
(4) Includes  $2,901  in 1994  related  to the cost of  constructing  a  records
    management  facility which was sold in a  sale-leaseback  transaction in the
    fourth quarter of 1994.
</FN>
</TABLE>


                                        5

<PAGE>



                                  RISK FACTORS


         Investors  should  carefully  consider the following  risk factors,  in
addition  to  the  other  information  contained  in  this  Prospectus  and  any
Prospectus  Supplement,   before  purchasing  any  of  the  Common  Stock.  This
Prospectus sets forth or incorporates  by reference  forward-looking  statements
within the meaning of Section 27A of the Securities Act, such as those regarding
the  goals,  beliefs,  plans or  current  expectations  of the  Company  and its
management and other statements  contained in this Prospectus  regarding matters
that are not historical facts. Because such  forward-looking  statements include
risks and  uncertainties,  actual  results  may  differ  materially  from  those
expressed in or implied by such forward-looking  statements.  Factors that could
cause actual results to differ materially  include,  but are not limited to, the
risk  factors  set forth  below and the  matters  set forth or  incorporated  by
reference  in this  Prospectus  generally  and any  Prospectus  Supplement.  The
Company  undertakes  no  obligation  to  release  publicly  the  results  of any
revisions to these forward-looking statements that may be made to reflect future
events or circumstances or to reflect unanticipated events.


Risks Associated with Acquisition Strategy

         Iron   Mountain   has   pursued  and  intends  to  continue  to  pursue
acquisitions  of records  management  and related  service  businesses  as a key
component of its growth  strategy.  Certain risks are inherent in an acquisition
strategy,  such  as  increasing  leverage  and  debt  service  requirements  and
combining  disparate  company  cultures and  facilities,  which could  adversely
affect  Iron  Mountain's   operating  results.  The  success  of  any  completed
acquisition  will  depend  in part  on  Iron  Mountain's  ability  to  integrate
effectively  the  acquired  businesses  into  Iron  Mountain.   The  process  of
integrating such acquired businesses may involve unforeseen difficulties and may
require a disproportionate  amount of management's attention and Iron Mountain's
financial  and  other  resources.  No  assurance  can be given  that  additional
suitable  acquisition  candidates will be identified,  financed and purchased on
acceptable  terms,  or that  recent  acquisitions  or  future  acquisitions,  if
completed, will be successful.

         In  September,  1997  Iron  Mountain  amended  and  restated  its  bank
facility,  dated as of September 30, 1996 among Iron Mountain, the lenders party
thereto and The Chase  Manhattan  Bank,  as  Administrative  Agent (the  "Credit
Agreement").  Under  the terms of the  Credit  Agreement,  acquisitions  by Iron
Mountain  involving in excess of: (i) $65 million (other than the acquisition of
Arcus Group,  Inc. (the "Arcus  Acquisition")  and the  acquisition of HIMSCORP,
Inc.  ("HIMSCORP"))  for  any one  acquisition  and  (ii)  $150  million  in the
aggregate  or $100 million in cash for 1998 or any  subsequent  year require the
approval  of lenders  holding  51% or more of the  commitments  under the Credit
Agreement.  No  assurance  can be given  that the  lenders  will  consent to any
acquisitions that Iron Mountain proposes to make in excess of such limits.

         The size,  timing and integration of possible future  acquisitions  may
cause substantial  fluctuations in operating results from quarter to quarter. As
a result, operating results for any quarter may not be indicative of the results
that may be  achieved  for any  subsequent  fiscal  quarter or for a full fiscal
year.

Competition; Alternative Technologies

         Iron Mountain has one or more competitors in all geographic areas where
it operates.  Iron Mountain  believes that competition for customers is based on
price,  reputation  for  reliability,  quality of service and scope and scale of
technology,  and believes that it generally competes  effectively based on these
factors.  As a result of this competition,  the records management  industry has
for the past several years experienced  downward pricing  pressures.  While Iron
Mountain  believes  that this pricing  climate is  stabilizing,  there can be no
assurance that prices will not decline  further,  as competitors seek to gain or
preserve  market  share.  Should a further  downward  trend in pricing  occur or
continue for an extended period of time, it could have a material adverse effect
on Iron  Mountain's  results of  operations.  Iron  Mountain  also  competes for
acquisition candidates.  Some of Iron Mountain's competitors may possess greater
financial and other resources than Iron Mountain. If any such competitor were to
devote additional resources to the 

                                        6

<PAGE>



records  management  business and such  acquisition  candidates  or to focus its
strategy on Iron Mountain's markets, Iron Mountain's results of operations could
be adversely  affected.  In addition,  Iron Mountain faces  competition from the
internal records management  capability of its current and potential  customers.
There can be no assurance that these  organizations will outsource more of their
records management needs or that they will not bring in-house some or all of the
functions they currently outsource.

         The substantial  majority of Iron Mountain's revenues have been derived
from the storage of paper  documents  and from  related  services.  Such storage
requires  significant physical space.  Alternative  technologies for generating,
capturing,  managing,  transmitting and storing information have been developed,
many of which require  significantly  less space than paper.  Such  technologies
include computer media,  microforms,  audio/video tape, film, CD-ROM and optical
disk. None of these  technologies  has replaced paper as the principal means for
storing  information.  However,  there  can be no  assurance  that  one or  more
non-paper-based  technologies  (whether now existing or developed in the future)
may not in the future reduce or supplant the use of paper as a preferred medium,
which could in turn adversely affect Iron Mountain's business.

Financial Leverage; Debt Service Requirements

         Iron Mountain is highly  leveraged due to the substantial  indebtedness
it has incurred  primarily to finance  acquisitions  and expand its  operations.
Iron  Mountain  expects to continue  to borrow  under the Credit  Agreement  and
possible  future  credit  arrangements  in  order  to  finance  possible  future
acquisitions and for general corporate purposes.

         The ability of Iron  Mountain to repay its  indebtedness  depends  upon
future operating performance, which is subject to the success of Iron Mountain's
business strategy,  prevailing economic conditions, levels of interest rates and
financial,  business and other factors, many of which are beyond Iron Mountain's
control.  The debt service  obligations  of Iron Mountain  could have  important
consequences,  including  the  following:  (i) the  ability of Iron  Mountain to
obtain  additional  financing for future  working  capital needs or for possible
future acquisitions or other purposes may be limited; (ii) a substantial portion
of Iron Mountain's cash flow from operations will be dedicated to the payment of
principal and interest on its indebtedness, thereby reducing funds available for
other purposes;  (iii) Iron Mountain may be more vulnerable to adverse  economic
conditions  than some of its  competitors and thus may be limited in its ability
to withstand  competitive  pressures;  and (iv) Iron Mountain may be more highly
leveraged than certain of its  competitors,  which may place it at a competitive
disadvantage.

         A substantial  portion of Iron  Mountain's cash flow from operations is
required for debt service. Management believes that cash flow from operations in
conjunction with borrowings from existing and possible future credit  facilities
will be sufficient for the foreseeable future to meet debt service  requirements
and to make possible  future  acquisitions  and capital  expenditures.  However,
there can be no assurance in this regard,  and Iron  Mountain's  leverage  could
make  it  vulnerable  to  a  downturn  in  the  operating   performance  of  its
subsidiaries, a downturn in economic conditions or, because borrowings under the
Credit Agreement bear interest at rates which  fluctuate,  increases in interest
rates on  borrowings  under  the  Credit  Agreement.  If such cash flow were not
sufficient to meet such debt service requirements or payments of principal, Iron
Mountain could be required to sell additional equity  securities,  refinance its
obligations or dispose of assets in order to make such scheduled payments. There
can be no  assurance  that Iron  Mountain  would be able to  effect  any of such
transactions or do so on favorable terms.

Casualty

         Iron Mountain currently  maintains and intends to continue to maintain,
to the extent such  insurance  is available on  commercially  reasonable  terms,
comprehensive  liability,  fire,  flood and earthquake  (where  appropriate) and
extended  coverage  insurance with respect to the properties that it now owns or
leases or that it may in the  future  own or lease,  with  customary  limits and
deductibles.  Certain types of loss,  however,  may not be fully  insurable on a
cost-effective  basis,  such as losses from  earthquakes,  or may be  altogether
uninsurable,  such as losses from riots.  Iron Mountain has in the past suffered
damages and losses from an earthquake  and a riot in  California,  which damages
and losses were substantially covered by insurance. In March 1997, Iron Mountain
experienced three fires, all of which

                                        7

<PAGE>



authorities have determined were caused by arson and which resulted in extensive
damage to one and destruction of the Company's other records management facility
in South  Brunswick  Township,  New  Jersey.  Iron  Mountain  has filed  several
insurance claims related to the South Brunswick  fires,  including a significant
claim under its business  interruption  insurance policy.  Some of the Company's
customers or their insurance  carriers have asserted claims or filed lawsuits as
a consequence of the destruction of or damage to their records due to the fires.
The Company is a defendant in three such  lawsuits.  The outcome of these claims
and  proceedings  cannot be  predicted.  Based on its present  assessment of the
situation,  after  consultation with legal counsel,  management does not believe
that the  outcome of these  claims  and  lawsuits  will have a material  adverse
effect on Iron Mountain's financial condition or results of operations, although
there can be no assurance in this regard.

         In the future,  should uninsured losses or damages occur, Iron Mountain
could lose both its investment in and anticipated profits and cash flow from the
affected property and may continue to be obligated on any leasehold obligations,
mortgage  indebtedness  or other  obligations  related  to such  property.  As a
result, any such loss could materially adversely affect Iron Mountain.

History of Losses; EBITDA Objective

          Iron Mountain has a history of experiencing  net losses  applicable to
common  stockholders.  Such net losses are  attributable  in part to significant
non-cash charges associated with Iron Mountain's pursuit of its growth strategy,
namely, (i) depreciation and amortization  expenses associated with expansion of
Iron Mountain's storage capacity and (ii) goodwill amortization  associated with
acquisitions  accounted for under the purchase method.  In addition,  net income
applicable to common  stockholders has been negatively  affected by a charge for
accretion of a redeemable put warrant and, in 1996, by an  extraordinary  charge
related  to the early  retirement  of debt.  The put  warrant  was  redeemed  in
February 1996, upon completion of Iron Mountain's initial public offering.

         Iron Mountain's primary financial objective is to increase its earnings
before  interest,  taxes,  depreciation,  amortization and  extraordinary  items
("EBITDA"),  which  is a  source  of  funds  to  service  indebtedness  and  for
investment in continued internal growth and growth through acquisitions, and not
net income and net income applicable to common  stockholders.  Iron Mountain has
benefited  from  growth  in  EBITDA,  while  net  losses  applicable  to  common
stockholders  have  increased  over such period.  Based on its experience in the
records management industry,  Iron Mountain believes that EBITDA is an important
tool for measuring the performance of records  management  companies  (including
potential  acquisition  targets) in several areas, such as liquidity,  operating
performance  and  leverage.  In  addition,  lenders use EBITDA as a criterion in
evaluating  records  management   companies,   and  Iron  Mountain's   financing
agreements  contain  covenants in which EBITDA is used as a measure of financial
performance.  Other measures of Iron Mountain's financial  performance,  such as
net  income  and  net  income  applicable  to  common  stockholders,  have  been
negatively  affected by pursuit of Iron Mountain's  objective to increase EBITDA
and may be  negatively  affected in the future.  In addition,  execution of Iron
Mountain's  growth  strategy  could result in future net losses due to increased
interest  expense  associated  with  borrowings  under the Credit  Agreement and
possible future credit arrangements and increased  depreciation and amortization
expenses.

Anti-Takeover  Effect of Certain  Provisions of Iron  Mountain's  Certificate of
Incorporation, By-Laws and the Notes Indentures

         Certain provisions of Iron Mountain's Amended and Restated  Certificate
of Incorporation  (the "Restated  Certificate") and Iron Mountain's By-Laws (the
"By-Laws")  could have the effect of making it more  difficult for a third party
to acquire,  or  discouraging  a third party from  acquiring,  a majority of the
outstanding  capital stock of Iron Mountain and could make it more  difficult to
consummate certain types of transactions involving an actual or potential change
in control of Iron  Mountain,  such as a merger,  tender offer or proxy contest.
The Restated Certificate also provides for three classes of Directors,  as equal
in number as possible,  to be elected on a staggered basis (one class per year).
As a  result  of such a  provision,  it would  generally  require  at least  two
elections of the Iron Mountain Board of Directors (the "Iron Mountain Board") to
replace a majority of the members of the Iron Mountain Board,  thereby  enabling
existing management to exercise significant control over Iron Mountain's affairs
during such period. Pursuant

                                        8

<PAGE>



to the Restated Certificate, shares of preferred stock, $.01 par value per share
(the "Preferred Stock") may be issued in the future without further  stockholder
approval and upon such terms and conditions,  and having such rights, privileges
and  preferences  (including  the  right to vote and the right to  convert  into
Common  Stock),  as the Iron  Mountain  Board  may  determine.  Pursuant  to the
By-Laws,  approximately 4 million shares of Common Stock that were issued by the
Company in five acquisitions are subject to restrictions on transfer for varying
periods of time,  all of which expire by January 1999. A significant  portion of
such shares are held by affiliates.

         Iron  Mountain  currently  has  outstanding  $165,000,000  in aggregate
principal amount of 10 1/8% Senior Subordinated Notes due 2006 issued in October
1996 (the "1996 Notes") and $250,000,000 in aggregate principal amount of 8 3/4%
Senior Subordinated Notes due 2009 issued in October 1997 (the "1997 Notes;" and
collectively  with the 1996  Notes,  the  "Senior  Subordinated  Notes").  Under
certain  circumstances  relating  to a change of  control  of Iron  Mountain  (a
"Change of Control") as set forth in the indentures for the Senior  Subordinated
Notes (the "Notes Indentures"),  Iron Mountain will be required to make an offer
to  purchase  all of the  outstanding  Senior  Subordinated  Notes at a purchase
price, in cash,  equal to 101% of the principal  amount thereof plus accrued and
unpaid interest, if any, to the date of purchase. There can be no assurance that
Iron Mountain  would be able to obtain such funds  through a refinancing  of the
Senior  Subordinated  Notes to be purchased or  otherwise,  or that the purchase
would be permitted under the Credit  Agreement.  Also, the requirement that Iron
Mountain  make an offer to purchase  all of the Senior  Subordinated  Notes then
outstanding in the event of a Change of Control may have the effect of deterring
a third party from  effecting a  transaction  that would  constitute a Change of
Control.

Control by Principal Stockholders

         The voting power held by certain  large  stockholders  of Iron Mountain
may have the effect of discouraging  certain types of transactions  involving an
actual or potential change of control of Iron Mountain,  including  transactions
in which the holders of Common Stock might otherwise receive a premium for their
shares over then-current market prices. In addition,  as a result of such voting
power such stockholders have the ability to significantly affect the election of
Directors of Iron Mountain who, in turn,  control the  management and affairs of
Iron Mountain.

Environmental Matters

         As of  September  30,  1997,  Iron  Mountain  owned or leased  over 150
records  management   facilities.   Under  various  federal,   state  and  local
environmental laws, ordinances and regulations  ("Environmental Laws"), an owner
of real estate or a lessee conducting  operations  thereon may become liable for
the costs of  investigation,  removal  or  remediation  of soil and  groundwater
contaminated by certain  hazardous  substances or wastes or petroleum  products.
Certain such laws impose cleanup  responsibility and liability without regard to
whether the owner or operator of the real estate or  operations  thereon knew of
or was responsible for the  contamination,  and whether or not operations at the
property have been  discontinued or title to the property has been  transferred.
In  addition,  the  presence  of such  substances,  or the  failure to  properly
remediate such property,  may adversely  affect the current  property owner's or
operator's  ability  to sell or rent  such  property  or to  borrow  using  such
property as collateral.  The owner or operator of contaminated  real estate also
may be subject to common law claims by third  parties based on damages and costs
resulting from off-site migration of the contamination.

         Certain  Environmental  Laws  govern  the  removal,   encapsulation  or
disturbance  of  asbestos-containing  materials  ("ACMs").  Such laws may impose
liability for release of ACMs and may enable third parties to seek recovery from
owners or operators of real estate for personal injury  associated with exposure
to such substances.  Certain facilities operated by Iron Mountain contain or may
contain ACMs. In addition, certain of the properties formerly or currently owned
or  operated by Iron  Mountain  were  previously  used for  industrial  or other
purposes that  involved the use or storage of hazardous  substances or petroleum
products  or the  generation  and  disposal  of  hazardous  wastes,  and in some
instances,  included the operation of  underground  storage tanks  ("USTs").  In
connection  with its  former  and  current  ownership  or  operation  of certain
properties, Iron Mountain may be potentially liable for environmental costs such
as those discussed above. Iron Mountain has from time to time conducted certain

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environmental  investigations  and remedial  activities at certain of its former
and current facilities,  but an in-depth  environmental review of all properties
has not yet been conducted by or on behalf of Iron Mountain.

         Iron  Mountain  believes  it  is in  substantial  compliance  with  all
applicable  material  Environmental  Laws.  No assurance can be given that there
are,  or  as a  result  of  possible  future  acquisitions  there  will  be,  no
environmental  conditions  for which Iron Mountain might be liable in the future
or  that  future   regulatory   action,   as  well  as  compliance  with  future
Environmental  Laws, will not require Iron Mountain to incur costs for or at its
properties  that  could  have a  material  adverse  effect  on  Iron  Mountain's
financial condition and results of operations.

No Intention to Pay Dividends

         Iron Mountain has never  declared or paid cash dividends on its capital
stock.  Iron Mountain  intends to retain future earnings for use in its business
and does not  anticipate  declaring  or paying any cash  dividends  on shares of
Common Stock in the foreseeable future. In addition,  Iron Mountain is currently
restricted under the terms of the Credit Agreement and the Notes Indentures from
declaring or paying cash dividends on its Common Stock.


                          DESCRIPTION OF CAPITAL STOCK

         The  following  description  of the capital  stock of Iron Mountain and
certain provisions of the Restated  Certificate and the By-Laws is a summary and
is qualified in its  entirety by reference to the Restated  Certificate  and the
By-Laws.

         Iron Mountain's authorized capital stock consists of 100,000,000 shares
of Common Stock,  1,000,000 shares of nonvoting common stock, par value $.01 per
share (the "Nonvoting  Common Stock"),  and 2,000,000 shares of Preferred Stock.
No shares of Preferred Stock have been issued.  There were 13,452,917  shares of
Common  Stock held by 219  holders of record and no shares of  Nonvoting  Common
Stock issued and outstanding as of January 5, 1998.

Common Stock

         The  rights of holders of the  Common  Stock and the  Nonvoting  Common
Stock are identical in all respects except voting and convertibility.

         Dividends.  Holders of record of shares of Common  Stock and  Nonvoting
Common Stock on the record date fixed by the Iron Mountain Board are entitled to
receive  such  dividends  as may be declared by the Iron  Mountain  Board out of
funds legally  available for such purpose.  No dividends may be declared or paid
in cash or property on any share of either class, however, unless simultaneously
the same  dividend is declared or paid on each share of the other class.  In the
case of any stock  dividend,  holders of each class are  entitled to receive the
same percentage dividend (payable in shares of that class) as the holders of the
other class.

         Iron  Mountain is  currently  restricted  under the terms of the Credit
Agreement and the Notes  Indentures from paying cash dividends on the Common and
Nonvoting Common Stock.  Even if funds were to be available,  Iron Mountain does
not intend to pay dividends in the foreseeable future.

         Voting  Rights.  Except as  otherwise  required  by law, on each matter
submitted  for a vote of  stockholders,  holders  of shares of Common  Stock are
entitled to one vote per share and  holders of  Nonvoting  Common  Stock are not
entitled to vote.

         Under the Restated Certificate,  the vote of holders of at least 80% of
the voting power of all  outstanding  shares of capital  stock  entitled to vote
generally in the election of Directors,  voting  together as a single class (the
"Voting Power"),  is required for the amendment or repeal of, or the adoption of
any  provision   inconsistent  with,

                                       10

<PAGE>



provisions  of the  Restated  Certificate  establishing  a  classified  Board of
Directors.  The vote of  holders  of at least  662/3%  of such  Voting  Power is
required  for the  amendment  or repeal  of, or the  adoption  of any  provision
inconsistent  with,  provisions  of the  Restated  Certificate  authorizing  the
Preferred Stock, Common Stock and Nonvoting Common Stock or specifying the terms
of the Common Stock and the Nonvoting  Common Stock  (including any amendment to
increase any shares of authorized capital stock).  Certain other provisions also
require such a 662/3%  vote.  See "DGCL and Certain  Provisions  of the Restated
Certificate  and the  By-Laws."  There are no  cumulative  voting  rights in the
election of the Board of Directors of the Company.

         Conversion   Provisions.   Shares  of   Nonvoting   Common   Stock  are
convertible, at any time at the option of the holder, on a share-for-share basis
into shares of Common Stock without the payment of any additional consideration;
provided that the conversion of any shares of Nonvoting  Common Stock by a "bank
holding  company" under the Bank Holding Company Act of 1956, as amended,  or an
affiliate  thereof is prohibited if the conversion of the total number of shares
of Nonvoting  Common Stock held by such holder would cause it to be in violation
of such Act.

         Liquidation Rights. Upon liquidation, dissolution or winding-up of Iron
Mountain, the holders of Common Stock and Nonvoting Common Stock are entitled to
share ratably  (based on the number of shares held) in all assets  available for
distribution  after  payment  in full of  creditors  and  payment in full to any
holders of Preferred  Stock then  outstanding of any amount  required to be paid
under the terms of such Preferred Stock.

         Other Provisions.  The outstanding shares of Common Stock and Nonvoting
Common Stock are validly issued,  fully paid and  nonassessable.  In any merger,
consolidation  or  business  combination,  holders of each  class  will  receive
identical consideration,  except that in any such transaction in which shares of
stock are distributed,  such shares may differ as to voting rights to the extent
that voting  rights now differ  between the two  classes.  Neither  class may be
subdivided,   consolidated,    reclassified   or   otherwise   changed   unless,
concurrently,  the other  class is  subdivided,  consolidated,  reclassified  or
otherwise changed in the same proportion and in the same manner.

         The  Transfer  Agent  and  Registrar  for the  Common  Stock is  Boston
Equiserve Limited Partnership,  150 Royall Street,  Canton,  Massachusetts 02021
(telephone number (781) 575-2000).

         The Iron Mountain Board has the power to issue shares of authorized but
unissued  Common Stock and Nonvoting  Common Stock without  further  stockholder
action.  The holders of Common Stock and Nonvoting Common Stock are not entitled
to preemptive or subscription rights. The issuance of such unissued shares could
have the effect of diluting  the  earnings per share and book value per share of
currently outstanding shares of Common Stock.

Preferred Stock

         The  authorized  and unissued  shares of Preferred  Stock may be issued
with such designations, preferences, limitations and relative rights as the Iron
Mountain Board may authorize including,  but not limited to: (i) the distinctive
designation  of each series and the number of shares that will  constitute  such
series;  (ii) the voting  rights,  if any, of shares of such  series;  (iii) the
dividend  rate on the shares of such  series,  any  restriction,  limitation  or
condition  upon  the  payment  of such  dividends,  whether  dividends  shall be
cumulative,  and the dates on which  dividends  are payable;  (iv) the prices at
which,  and the terms and conditions on which,  the shares of such series may be
redeemed,  if such  shares are  redeemable;  (v) the  purchase  or sinking  fund
provisions,  if any,  for the purchase or  redemption  of shares of such series;
(vi) any preferential  amount payable upon shares of such series in the event of
the liquidation,  dissolution or winding-up of Iron Mountain or the distribution
of its  assets;  and (vii) the price or rates of  conversion  at which,  and the
terms and  conditions  on which the shares of such series may be converted  into
other securities, if such shares are convertible.  Although Iron Mountain has no
present  intention to issue shares of Preferred Stock, the issuance of Preferred
Stock,  or the issuance of rights to purchase such shares,  could  discourage an
unsolicited  acquisition proposal and the rights of holders of Common Stock will
be subject to, and may be  adversely  affected  by, the rights of holders of any
Preferred Stock that may be issued in the future.


                                       11

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             DGCL AND CERTAIN PROVISIONS OF THE RESTATED CERTIFICATE
                                 AND THE BY-LAWS

         The Restated  Certificate and the By-Laws  contain  certain  provisions
that could delay or make more  difficult  the  acquisition  of Iron  Mountain by
means of a tender  offer,  a proxy contest or otherwise.  These  provisions,  as
described below, are expected to discourage  certain types of coercive  takeover
practices  and  inadequate  takeover  bids and to encourage  persons  seeking to
acquire  control of Iron Mountain first to negotiate  with Iron  Mountain.  Iron
Mountain  believes  that the benefits of increased  protection of its ability to
negotiate with the proponent of an unfriendly or unsolicited proposal to acquire
or restructure Iron Mountain  outweigh the  disadvantages  of discouraging  such
proposals  because,  among  other  things,  negotiations  with  respect  to such
proposals could result in an improvement of their terms.

Classified Board of Directors

         The  Restated  Certificate  and the  By-Laws  provide  for a  Board  of
Directors  that is divided into three classes of  Directors,  as nearly equal in
number as possible,  with the term of each class  expiring in a different  year.
The ByLaws  provide that the number of Directors will be fixed from time to time
exclusively  by the Iron Mountain  Board,  but shall consist of not more than 15
nor less than three Directors. The classified Iron Mountain Board is intended to
promote  continuity  and stability of Iron  Mountain's  management  and policies
since a majority of the  Directors at any given time will have prior  experience
as  Directors  of Iron  Mountain.  Such  continuity  and  stability  facilitates
long-range  planning of Iron Mountain's  business and ensures the quality of its
business operations. The classification of Directors has the effect of making it
more difficult to change the  composition of the Iron Mountain  Board.  At least
two annual stockholder  meetings,  instead of one, would be required to effect a
change in the majority  control of the Iron Mountain Board,  except in the event
of vacancies  resulting from removal (in which case the remaining Directors will
fill the vacancies so created).  See "--Removal of Directors;  Filling Vacancies
on the Iron Mountain Board."

Removal of Directors; Filling Vacancies on the Iron Mountain Board

         The Restated Certificate and Iron Mountain By-Laws provide that an Iron
Mountain  Director may be removed by the stockholders only for cause at any time
during such Director's  term of office by affirmative  vote of the holders of at
least 80% of the Voting Power.

         The By-Laws and the Restated Certificate both provide that a vacancy on
the Iron Mountain Board,  including a vacancy created by an increase in the size
of the Iron Mountain Board by the Directors,  may be filled by a majority of the
remaining Directors or by a sole remaining Director,  or if no Directors remain,
then by the  stockholders.  The  Restated  Certificate  also  provides  that any
Director  elected by the Iron Mountain  Board to replace  another  Director of a
given class of Directors  will hold office until the next election of such class
of  Directors.  These  provisions  are to  ensure  that a third  party  would be
precluded from removing incumbent  Directors and simultaneously  gaining control
of the Iron Mountain Board by filling the vacancies created by such removal with
its own nominees.  Moreover, even if the holders of the outstanding Common Stock
were to vote to remove Directors for cause,  only the remaining  Directors would
have the power to fill the vacancies  created by such removal,  unless such vote
provided for the removal of the entire Iron Mountain Board for cause.

Amendment of Certain Provisions of the Restated Certificate and the By-Laws

         The Restated  Certificate and the By-Laws contain provisions  requiring
the  affirmative  vote of the holders of at least  662/3% of the Voting Power to
amend  certain  provisions  of the Restated  Certificate  and the By-Laws.  This
supermajority  voting  provision  also  applies  to (i)  the  provisions  of the
Restated Certificate authorizing Iron Mountain to release its Directors from any
liability  for  monetary  damages as a result of any  breach of their  fiduciary
duties,  with certain  exceptions  mandated by the DGCL, and (ii) the provisions
allowing for the indemnification of officers and Directors of Iron Mountain. The
Restated Certificate provides that the By-Laws may be amended only by a majority
of the full Iron Mountain Board or by the  stockholders  holding at least 662/3%
of the Voting Power. The DGCL

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<PAGE>



provides that by-laws may not be amended by a  corporation's  Board of Directors
unless the corporation's  certificate of incorporation expressly authorizes such
amendments by the Board of Directors;  the Restated  Certificate includes such a
provision.  Under the Restated Certificate,  at least 80% of the Voting Power is
required to approve  amendments to those provisions of the Restated  Certificate
or Iron Mountain  By-Laws  establishing a classified  Board,  specifying  notice
requirements for stockholder  nominations of Directors or business to be brought
by  a  stockholder   before  an  annual  meeting  and  limiting  the  rights  of
stockholders  to remove  Directors or fill vacancies on the Iron Mountain Board,
to call special meetings or to effect actions by written consent.

Stockholder Actions and Meetings

         Iron Mountain's Restated  Certificate  provides that stockholder action
may be taken only at an annual or special meeting of stockholders  and prohibits
stockholders  action by  written  consent  in lieu of a  meeting.  The  Restated
Certificate  and  Iron  Mountain   By-Laws  provide  that  special  meetings  of
stockholders can be called by the Chairman of the Board of Directors, if any, or
the Iron Mountain Board  pursuant to a resolution  approved by a majority of the
members of the Iron Mountain  Board.  The business  permitted to be conducted at
any special meeting of  stockholders  is limited to the business  brought before
the meeting by the Iron Mountain Board.  The By-Laws set forth an advance notice
procedure  with regard to the  nomination,  other than by or at the direction of
the Iron Mountain Board, of candidates for election as directors and with regard
to business brought before an annual meeting of stockholders of Iron Mountain.

Delaware Anti-Takeover Statute

         Subject to certain  exceptions  set forth  therein,  Section 203 of the
DGCL provides that a  corporation  shall not engage in any business  combination
with any "interested  stockholder"  for a three-year  period  following the date
that such stockholder becomes an interested stockholder unless (i) prior to such
date,  the board of directors of the  corporation  approved  either the business
combination  or the  transaction  that resulted in the  stockholder  becoming an
interested stockholder,  (ii) upon consummation of the transaction that resulted
in  the  stockholder   becoming  an  interested   stockholder,   the  interested
stockholder  owned  at  least  85%  of  the  voting  stock  of  the  corporation
outstanding at the time the transaction  commenced (excluding certain shares) or
(iii) on or subsequent to such date, the business combination is approved by the
board of directors of the corporation  and by the  affirmative  vote of at least
662/3% of the  outstanding  voting  stock  which is not owned by the  interested
stockholder.  Except as specified therein, an interested  stockholder is defined
to mean  any  person  that (a) is the  owner  of 15% or more of the  outstanding
voting  stock of the  corporation  or (b) is an  affiliate  or  associate of the
corporation and was the owner of 15% or more of the outstanding  voting stock of
the corporation at any time within three years immediately prior to the relevant
date, or any affiliate or associate of such person  referred to in (a) or (b) of
this  sentence.  Under certain  circumstances,  Section 203 of the DGCL makes it
more  difficult  for  an  interested  stockholder  to  effect  various  business
combinations  with  a  corporation  for  a  three-year   period,   although  the
stockholders may, by adopting an amendment to the  corporation's  certificate of
incorporation  or by-laws,  elect not to be governed by this section,  effective
twelve months after  adoption.  The Restated  Certificate and the By-Laws do not
exclude Iron  Mountain  from the  restrictions  imposed under Section 203 of the
DGCL.  It is  anticipated  that the  provisions  of Section  203 of the DGCL may
encourage  companies  interested  in  acquiring  Iron  Mountain to  negotiate in
advance with the Iron Mountain Board.


                                  LEGAL MATTERS

         The validity of the shares of Common Stock  offered by this  Prospectus
have been  passed upon for the  Company by  Sullivan &  Worcester  LLP,  Boston,
Massachusetts.  Jas. Murray Howe,  Secretary of Iron Mountain,  is of counsel to
Sullivan & Worcester LLP and beneficially owns 3,855 shares of Common Stock.


                                       13

<PAGE>
                                     EXPERTS

         The  consolidated  financial  statements  and schedule of Iron Mountain
Incorporated  and its  subsidiaries for the three years ended December 31, 1996,
included in Iron  Mountain's  Annual  Report on Form 10-K,  have been audited by
Arthur Andersen LLP, independent public accountants,  as stated in their reports
with respect thereto,  and are incorporated by reference herein in reliance upon
the authority of said firm as experts in giving said reports.

         The financial statements of Nashville Vault Company,  Ltd. for the year
ended December 31, 1995, included in Iron Mountain's  Registration  Statement on
Form S-4 (file No. 333-24635, effective date May 14, 1997), have been audited by
Geo.  S. Olive & Co. LLC,  independent  public  accountants,  as stated in their
report  with  respect  thereto,  and are  incorporated  by  reference  herein in
reliance upon the authority of said firm as experts in giving said report.

         The financial  statements of International Record Storage and Retrieval
Services, Inc. for the year ended December 31, 1995, included in Iron Mountain's
Registration  Statement on Form S-4 (file No. 333-24635,  effective date May 14,
1997), have been audited by Rothstein,  Kass & Company, P.C., independent public
accountants,   as  stated  in  their  report  with  respect  thereto,   and  are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.

         The financial  statements of Mohawk Business  Record Storage,  Inc. for
the year ended  December  31,  1995,  included in Iron  Mountain's  Registration
Statement on Form S-4 (file No.  333-24635,  effective date May 14, 1997),  have
been audited by Arthur Andersen LLP,  independent public accountants,  as stated
in their report with respect  thereto,  and are incorporated by reference herein
in reliance upon the authority of said firm as experts in giving said report.

         The financial statements of Security Archives of Minnesota for the year
ended December 31, 1996,  included in Iron Mountain's Current Report on Form 8-K
dated October 30, 1997,  have been audited by Arthur  Andersen LLP,  independent
public  accountants,  as stated in their  report with respect  thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.

         The financial statements of Wellington Financial Services, Inc. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K  dated  October  30,  1997,  have  been  audited  by  Arthur  Andersen  LLP,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial statements of Allegiance Business Archives,  Ltd. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K dated November 25, 1997, have been audited by Stout, Causey & Horning, P.A.,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial  statements and schedule of Safesite  Records  Management
Corporation  for the three  years  ended  December  31,  1996,  included in Iron
Mountain's  Registration  Statement on Form S-4 (file no.  333-24635,  effective
date May 14, 1997), have been audited by Arthur Andersen LLP, independent public
accountants,   as  stated  in  their  reports  with  respect  thereto,  and  are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said reports.

         The financial statements of Concorde Group, Inc. and Neil Trucker Trust
for the year ended December 31, 1996, included in Iron Mountain's Current Report
on Form 8-K dated  October  30,  1997,  have been  audited by Fisher,  Schacht &
Oliver  LLP,  independent  public  accountants,  as stated in their  report with
respect  thereto,  and are incorporated by reference herein in reliance upon the
authority of said firm as experts in giving said report.

         The financial statements of Data Securities International, Inc. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K  dated  October  30,  1997,  have  been  audited  by  Arthur  Andersen  LLP,

                                       14

<PAGE>



independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial statements of Records Retention/FileSafe,  LP for the two
years ended  December 31, 1996,  included in Iron  Mountain's  Current Report on
Form 8-K dated November 25, 1997, have been audited by Abbott Stringham & Lynch,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in accounting and auditing.

         The   consolidated   financial   statements   of  HIMSCORP,   Inc.  and
Subsidiaries  for the period  February 1, 1995 to December  31, 1995 and for the
year ended December 31, 1996,  appearing in Iron  Mountain's  Current Reports on
Form 8-K dated  October 30, 1997 and  November  25,  1997,  have been audited by
Ernst & Young LLP, independent  auditors,  as set forth in their reports thereon
included therein,  and are incorporated by reference herein in reliance upon the
authority of said firm as experts in giving said report.

         The consolidated  financial  statements of Arcus  Technology  Services,
Inc.  (Successor  Company)  for the year ended  December  31,  1996 and the five
months ended  December 31, 1995 and the  consolidated  financial  statements  of
Arcus, Inc.  (Predecessor  Company) for the seven months ended July 31, 1995 and
the year ended December 31, 1994,  appearing in Iron Mountain's  Current Reports
on Form 8-K dated  October 30, 1997 and November 25, 1997,  have been audited by
Ernst & Young LLP, independent  auditors,  as set forth in their reports thereon
included  therein,  and  incorporated  by reference  herein in reliance upon the
authority of such firm as experts in accounting and auditing.

         The consolidated  financial statements of Arcus Group, Inc. for the two
years in the period  ended  December  31,  1996,  appearing  in Iron  Mountain's
Current  Reports on Form 8-K dated October 30, 1997 and November 25, 1997,  have
been audited by Ernst & Young LLP, independent  auditors,  as set forth in their
reports  thereon  included  therein,  and  incorporated  by reference  herein in
reliance upon the authority of such firm as experts in accounting and auditing.

         The consolidated financial statements of Arcus Group, Inc. for the year
ended December 31, 1994,  included in Iron Mountain's Current Report on Form 8-K
dated November 25, 1997, have been audited by Arthur  Andersen LLP,  independent
public  accountants,  as stated in their  report with respect  thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.


                                       15

<PAGE>



         No person has been  authorized to give any  information  or to make any
representations  other than those contained or incorporated by reference in this
Prospectus in connection  with the offer  contained in this  Prospectus  and, if
given or made, such  information or  representations  must not be relied upon as
having been  authorized by the Company or any  underwriters,  agents or dealers.
This Prospectus does not constitute an offer to sell or solicitation of an offer
to buy  securities in any  jurisdiction  to any person to whom it is unlawful to
make such offer or solicitation. Neither the delivery of this Prospectus nor any
sale made hereunder shall, under any  circumstances,  create an implication that
there has been no change in the  affairs  of the  Company  and its  subsidiaries
since the date hereof or the information  contained or incorporated by reference
herein is correct at any time subsequent to the date hereof.

                                TABLE OF CONTENTS
                                                                          Page
Available Information                                                     2
Incorporation of Certain Documents by Reference                           2
The Company                                                               3
Selected Consolidated Financial and Operating Information                 4
Risk Factors                                                              6
Description of Capital Stock                                              10
DGCL and Certain Provisions of the
 Restated Certificate and the By-laws                                     12
Legal Matters                                                             13
Experts                                                                   14


                                       16

<PAGE>



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20.  Indemnification of Directors and Officers.

         Section  145 of the  Delaware  General  Corporation  Law  (the  "DGCL")
provides, in effect, that any person made a party to any action by reason of the
fact that he is or was a Director,  officer,  employee or agent of Iron Mountain
may and, in certain cases, must be indemnified by Iron Mountain against,  in the
case of a non-derivative  action,  judgments,  fines, amounts paid in settlement
and reasonable expenses (including  attorney's fees) incurred by him as a result
of  such  action,  and in the  case of a  derivative  action,  against  expenses
(including  attorney's fees), if in either type of action he acted in good faith
and in a manner  he  reasonably  believed  to be in or not  opposed  to the best
interests of Iron Mountain. This indemnification does not apply, in a derivative
action,  to  matters  as to which it is  adjudged  that the  Director,  officer,
employee  or agent is liable to Iron  Mountain,  unless  upon court  order it is
determined that, despite such adjudication of liability,  but in view of all the
circumstances of the case, he is fairly and reasonably entitled to indemnity for
expenses,  and, in a non-derivative  action, to any criminal proceeding in which
such person had reasonable cause to believe his conduct was unlawful.

         Article Sixth of Iron Mountain's Restated  Certificate of Incorporation
provides that Iron Mountain shall indemnify each person who is or was an officer
or Director of Iron Mountain to the fullest  extent  permitted by Section 145 of
the DGCL.

         Article   Seventh   of  Iron   Mountain's   Restated   Certificate   of
Incorporation  states that no Director of Iron Mountain  shall be liable to Iron
Mountain or its  stockholders  for monetary damages for breach of fiduciary duty
as a  Director,  except to the extent that  exculpation  from  liability  is not
permitted under the DGCL as in effect when such breach occurred.


Item 21.  Exhibits

         Exhibits  indicated below are incorporated by reference to documents of
Iron Mountain on file with the Commission.  Exhibit numbers in parentheses refer
to the exhibit  numbers in the applicable  filing.  All other exhibits are filed
herewith.



<TABLE>
<CAPTION>
      Exhibit No.                                     Item                                             Exhibit
<S>                       <C>                                                                     <C>
           2.1            Agreement and Plan of Merger, dated as of September                          (2.2)7
                          26,  1997,  by and among Iron  Mountain,  Arcus Group,
                          United  Acquisition  Company and Arcus  (collectively,
                          the "Arcus Parties")
           2.1A           Amendment No. 1 to Agreement and Plan of Merger,                            (2.1A)9
                          dated as of November 25, 1997, by and among Iron
                          Mountain and each of the Arcus Parties
           2.2            Agreement and Plan of Merger, dated as of February 19,                        (2)3
                          1997, by and among Iron Mountain, IM-1 Acquisition
                          Corp. and Safesite Records Management Corporation
           2.3            Amendment No. 1 to Agreement and Plan of Merger,                             (2A)5
                          dated as of April 1, 1997, by and among Iron Mountain,
                          IM-1 Acquisition Corp. and Safesite Records
                          Management Corporation


                                      II-1

<PAGE>




           2.4            Amendment No. 2 to Agreement and Plan of Merger,                             (2B)5
                          dated as of May 7, 1997, by and among Iron Mountain,
                          IM-1 Acquisition Corp. and Safesite Records
                          Management Corporation
           2.5            Agreement and Plan of Merger, dated as of August 25,                         (2.3)7
                          1997, by and among Iron Mountain, DSI Acquisition
                          Corporation and Data Securities International, Inc.
           2.6            Agreement and Plan of Merger, dated as of September                          (2.2)8
                          17, 1997, by and among Iron Mountain, IM-3
                          Acquisition Corp. and HIMSCORP, Inc.
           2.7            Agreement and Plan of Merger, dated as of February 24,                      (2.7)13
                          1998, by and among Iron Mountain, IM-3 Acquisition
                          Corp. and InterMation, Inc. (portions of this exhibit have
                          been omitted pursuant to a request for confidential
                          treatment)
           2.8            The Agreement and Plan of Merger by and among Iron                          (2.1)14
                          Mountain Records Management, Inc., Iron
                          Mountain/NUS, Inc. and National Underground Storage,
                          Inc. dated as of June 5, 1998. (portions of this exhibit
                          have been omitted pursuant to a request for confidential
                          treatment)
           3.1            Amended and Restated Certificate of Incorporation of                        (3.1)10
                          Iron Mountain, as amended
           3.2            Amended and Restated By-Laws of Iron Mountain, as                           (3.2)10
                          amended
           5              Opinion of Sullivan & Worcester LLP                                          (5)11
           10.1           Second Amended and Restated Credit Agreement, dated                         (10.1)7
                          as of September  26, 1997,  among Iron  Mountain,  the
                          lenders party thereto and The Chase Manhattan Bank, as
                          Administrative Agent
           10.2           Amendment No. 1 to the Second Amended and Restated                       Filed herewith
                          Credit Agreement, dated December 31, 1997, among                        as Exhibit 10.2
                          Iron Mountain, the lenders party thereto and The Chase
                          Manhattan Bank, as Administrative Agent
           10.3           Indenture for 101/8 Senior Subordinated Notes due 2006                      (10.3)3
                          by and among Iron Mountain, certain of its subsidiaries
                          and First National Association, as trustee, dated October
                          1, 1996
           10.4           Indenture of 8 3/4% Senior Subordinated Notes due 2009                       (4.1)6
                          by and among Iron Mountain, certain of its subsidiaries
                          and The Bank of New York, as trustee, dated October 24,
                          1997
           10.5           Iron Mountain Incorporated 1995 Stock Incentive Plan, as                    (10.1)4
                          amended


                                                       II-2

<PAGE>




           10.6           Iron Mountain/UAC 1995 Stock Option Plan                                    (10.1)12
           10.7           Iron Mountain/ATSI 1995 Stock Option Plan                                   (10.2)12
           10.8           Iron Mountain Incorporated 1998 Employee Stock                           Filed herewith
                          Purchase Plan                                                           as Exhibit 10.8
           10.9           Record Center Storage Services Agreement between                            (10.18)1
                          IMRM and Resolution Trust Corporation,  dated July 31,
                          1992, as renewed by letter  agreement  effective  July
                          26, 1996 between Iron Mountain and the Federal Deposit
                          Insurance Corporation
           10.10          Lease between IMRM and IM Houston (CR) Limited                              (10.19)1
                          Partnership, dated January 1, 1991
           10.11          Asset Purchase and Sale Agreement, dated July 11, 1996,                     (10.20)2
                          among IMRM, The Fortress Corporation and certain
                          subsidiaries
           10.12          Asset Purchase Agreement, dated as of September 6,                          (10.23)2
                          1996, among IMRM, Mohawk Business Record Storage,
                          Inc., Michael M. Rabin, Richard K. Rabin, Herman
                          Ladin and Sidney Ladin
           10.13          Amended and Restated Registration Rights Agreement                          (10.2)4
                          between Iron Mountain and certain Stockholders, dated as
                          of June 12, 1997
           10.14          Joinder to Registration Rights Agreement, dated as of                       (10.12)9
                          October 31, 1997, by and between Iron Mountain and
                          Kent P. Dauten
           10.15          Stockholders' Agreement, dated September 17, 1997, by                      (10.13)10
                          and between Iron Mountain and Kent P. Dauten
           10.16          Stockholders' Agreement, dated as of February 19, 1997                      (10.20)3
                          by and between Iron Mountain and certain stockholders
                          of Safesite Records Management Corporation
           10.17          Asset Purchase and Sale Agreement, dated March 12,                          (10.22)5
                          1997, by and among IMRM, Chicago Data Destruction
                          Corporation, and John Mengel and John S. Mengel
           10.18          Asset Purchase and Sale Agreement, dated as of August                       (10.2)7
                          20, 1997, by and between IMRM and Records
                          Retention/FileSafe, L.P.
           10.19          Stockholders' Agreement, dated as of September 26,                          (10.16)9
                          1997, by and among Iron Mountain and certain
                          stockholders of the Arcus Parties
           11             Statement re: computation of per share earnings                              (11)7
           21             Subsidiaries of Iron Mountain                                            Filed herewith
                                                                                                   as Exhibit 21


                                                       II-3

<PAGE>




           23.1           Consent of Ernst & Young LLP (Arcus Group, Inc. and                         (23.1)11
                          Arcus Technology Services, Inc.
           23.2           Consent of Arthur Andersen LLP (Arcus Group, Inc.)                          (23.2)11
           23.3           Consent of Ernst & Young LLP (HIMSCORP, Inc. and                            (23.3)11
                          Subsidiaries)
           23.4           Consent of Stout, Causey & Horning, P.A. (Allegiance                        (23.4)11
                          Business Archives, Ltd.)
           23.5           Consent of Abbott, Stringham & Lynch (Records                               (23.5)11
                          Retention/FileSafe, LP)
           23.6           Consent of Arthur Andersen LLP (Security Archives of                        (23.6)11
                          Minnesota, Wellington Financial Services, Inc. and Data
                          Securities International, Inc.)
           23.7           Consent of Fisher, Schacht & Oliver, LLP (Concorde                          (23.7)11
                          Group, Inc. and Neil Tucker Trust)
           23.8           Consent of Arthur Andersen LLP (Safesite Records                            (23.8)11
                          Management Corporation and Mohawk Business Record
                          Storage, Inc.)
           23.9           Consent of Geo S. Olive & Co. LLC (Nashville Vault                          (23.9)11
                          Company, Ltd.)
           23.10          Consent of Rothstein, Kass & Company, P.C.                                 (23.10)11
                          (International Record Storage and Retrieval Service, Inc.)
           23.11          Consent of Arthur Andersen LLP (Iron Mountain                              (23.11)11
                          Incorporated)
           23.12          Consent of Sullivan & Worcester LLP                                          (5)11
           27.1           Financial Data Schedule--December 31, 1997                                   (27.1)12
           27.2           Financial Data Schedule--Restated March 31, 1997, June                       (27.2)13
                          30, 1997 and September 30, 1997.
           27.3           Financial  Data   Schedule--Restated  June  30,  1996,                       (27.3)13
                          September 30, 1996 and December 31, 1996.
<FN>
- ----------------

1        Filed  as  an  Exhibit  to  Iron Mountain's Registration  Statement No. 
         33-99950 filed with the Commission on December 1, 1995.
2        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-10359 filed with the Commission on August 16, 1996.
3        Filed as an Exhibit to Iron  Mountain's  Quarterly  Report on Form 10-Q
         for the quarter ended June 30, 1996,  filed with the  Commission,  File
         No. 0-27584.
4        Filed as an Exhibit to Iron  Mountain's  Quarterly  Report on Form 10-Q
         for the quarter ended  September 30, 1996,  filed with the  Commission,
         File No. 0-27584.
5        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-24635 filed with the Commission on April 4, 1997, as amended on May
         7, 1997 and May 13, 1997.
6        Filed as an Exhibit to Iron Mountain's Current Report on Form 8-K dated
         October 30, 1997, filed with the Commission, File No. 0-27584.

                                      II-4

<PAGE>



7        Filed as an Exhibit to Iron  Mountain's  Quarterly  Report on Form 10-Q
         for the quarter ended  September 30, 1997,  filed with the  Commission,
         File No. 0-27584.
8        Filed as an Exhibit  to Iron  Mountain's  Current  Report on Form 8-K/A
         dated November 10, 1997, filed with the Commission, File No. 0-27584.
9        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-41045 filed with the Commission on November 26, 1997.
10       Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-44185 filed with the Commission on January 13, 1998.
11       Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-44187 filed with the Commission on January 13, 1998.
12       Filed as an Exhibit to Iron Mountain's Current Report on Form 8-K dated
         March 9, 1998, filed with the Commission, File No. 0-27584.
13       Filed as an Exhibit to Iron  Mountain's  Annual Report on Form 10-K for
         the year ended December 31, 1997,  filed with the Commission,  File No.
         0-27584.
14       Filed as an Exhibit to Iron Mountain's Current Report on Form 8-K dated
         July 10, 1998, filed with the Commission, File No. 0-27584.
</FN>
</TABLE>


Item 22.  Undertakings

         Iron Mountain hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this Registration Statement:

              (i) To include any prospectus  required by Section 10(a)(3) of the
         Securities Act of 1933, as amended (the "Securities Act");

             (ii) To reflect in the prospectus any facts or events arising after
         the effective date of this  Registration  Statement (or the most recent
         post-effective  amendment  thereof)  which,   individually  or  in  the
         aggregate,  represent a fundamental change in the information set forth
         in this  Registration  Statement.  Notwithstanding  the foregoing,  any
         increase  or  decrease  in volume of  securities  offered (if the total
         dollar  value of  securities  offered  would not exceed  that which was
         registered) and any deviation from the low or high and of the estimated
         maximum offering range may be reflected in the form of prospectus filed
         with the Commission  pursuant to Rule 424(b) if, in the aggregate,  the
         changes in volume and price represent no more than 20 percent change in
         the maximum  aggregate  offering price set forth in the "Calculation of
         Registration Fee" table in the effective Registration Statement;

            (iii) To include any material  information  with respect to the plan
         of distribution not previously disclosed in the Registration  Statement
         or  any  material  change  to  such  information  in  the  Registration
         Statement;

provided,  however,  that the  undertakings  set forth in paragraphs  (1)(i) and
(1)(ii)  above do not apply if the  information  required  to be  included  in a
post-effective  amendment by those  paragraphs is contained in periodic  reports
filed  by  the  Registrant  pursuant  to  Section  13 or  Section  15(d)  of the
Securities Act of 1934, as amended (the "Exchange Act") that are incorporated by
reference in this Registration Statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
Registration  Statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof;

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering;


                                      II-5

<PAGE>



         (4)  That,  for  purposes  of  determining   any  liability  under  the
Securities  Act,  each  filing of the  Registrant's  Annual  Report  pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and where  applicable,  each
filing of an employee  benefit plan's annual report pursuant to Section 15(d) of
the  Exchange  Act)  that is  incorporated  by  reference  in this  Registration
Statement  shall be deemed to be a new  registration  statement  relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof;

         (5) That prior to any public  reoffering of the  securities  registered
hereunder  through  use of a  prospectus  which  is a part of this  Registration
Statement,  by any person or party who is deemed to be an underwriter within the
meaning  of  Rule  145(c),  the  Registrant   undertakes  that  such  reoffering
prospectus   will  contain  the   information   called  for  by  the  applicable
registration  form with  respect to  reofferings  by  persons  who may be deemed
underwriters,  in addition to the  information  called for by the other items of
the applicable form;

         (6) That every prospectus:  (i) that is filed pursuant to paragraph (4)
immediately preceding, or (ii) that purports to meet the requirements of Section
10(a)(3) of the  Securities  Act and is used in  connection  with an offering of
securities  subject to Rule 415,  will be filed as a part of an amendment to the
Registration  Statement and will not be used until such  amendment is effective,
and that, for purposes of determining  any liability  under the Securities  Act,
each such  post-effective  amendment  shall be  deemed to be a new  registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof;

         (7) To respond to requests  for  information  that is  incorporated  by
reference into the prospectus  pursuant to Item 4, 10(b), 11 or 13 of this form,
within one business day of receipt of such request, and to send the incorporated
documents  by first class mail or other  equally  prompt  means.  This  includes
information  contained in documents  filed  subsequent to the effective  date of
this Registration Statement through the date of responding to the request;

         (8) To supply by means of a post-effective  amendment,  all information
concerning a transaction,  and the company being acquired involved therein, that
was not the subject of and included in the Registration Statement when it became
effective.

         Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to  Directors,  officers  and  controlling  persons of Iron
Mountain,  Iron Mountain has been advised that in the opinion of the  Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Securities Act and is, therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment  by Iron  Mountain  in the  successful  defense of any  action,  suit or
proceeding)  is  asserted by such  Director,  officer or  controlling  person in
connection with the securities being  registered,  Iron Mountain will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act and will be governed by the final adjudication of such issue.


                                      II-6

<PAGE>



                                   SIGNATURES

         Pursuant to the  requirements  of the  Securities  Act,  Iron  Mountain
Incorporated  has duly caused this  Registration  Statement  to be signed on its
behalf by the  undersigned,  thereunto duly  authorized,  in the City of Boston,
Commonwealth of Massachusetts, on August 3, 1998.


                            IRON MOUNTAIN INCORPORATED



                            By: /s/ C. Richard Reese
                                Name:  C. Richard Reese
                                Title:   Chairman of the Board of Directors
                                         and Chief Executive Officer

         Pursuant to the  requirements of the Securities Act, this 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 of the Board of Directors                August 3, 1998
C. Richard Reese                        and Chief Executive Officer


                  *                     President, Chief Operating Officer                August 3, 1998
- ----------------------------------------
David S. Wendell                        and Director


                  *                     Executive Vice President and Chief Financial      August 3, 1998
- ----------------------------------------
John F. Kenny, Jr.                      Officer


                  *                     Executive Vice President and Director             August 3, 1998
- ----------------------------------------
Eugene B. Doggett


                  *                     Director                                          August 3, 1998
- ----------------------------------------
Constantin R. Boden


                  *                     Director                                          August 3, 1998
- ----------------------------------------
Arthur D. Little


                  *                     Director                                          August 3, 1998
- ----------------------------------------
Vincent J. Ryan


                  *                     Director                                          August 3, 1998
- ----------------------------------- ----
B. Thomas Golisano


                                                       II-7

<PAGE>




                   *                    Director                                          August 3, 1998
- ----------------------------------------
Kent P. Dauten



                   *                    Director                                          August 3, 1998
- ----------------------------------------
Clarke H. Bailey



                   *                    Vice President and Corporate Controller           August 3, 1998
- ----------------------------------------
Jean A. Bua

<FN>
 *By: /s/ C. Richard Reese
Attorney-in-Fact
</FN>
</TABLE>






                                      II-8


                                                                    Exhibit 10.2

                                 AMENDMENT NO. 1

         AMENDMENT  NO. 1 dated as of  December  31,  1997 among  IRON  MOUNTAIN
INCORPORATED,  a corporation  duly organized and validly existing under the laws
of the State of Delaware  (the  "Company");  each of the  lenders  listed on the
signature pages hereof under the caption "LENDERS" (individually, a "Lender" and
collectively,  the "Lenders");  and THE CHASE MANHATTAN BANK, as  administrative
agent for the  Lenders  (in such  capacity,  together  with its  successors  and
assigns in such capacity, the "Agent").

         The Company,  the Lenders and the Agent are parties to a Second Amended
and Restated  Credit  Agreement dated as of September 26, 1997, as modified by a
Waiver  dated as of  December  31,  1997 (as in effect on the date  hereof,  the
"Credit Agreement"), providing, subject to the terms and conditions thereof, for
extensions  of credit (by  making  loans and  issuing  letters of credit) by the
Lenders to the Company in an aggregate  principal  or face amount not  exceeding
$250,000,000.  The Company and the Lenders wish to amend the Credit Agreement in
certain respects. Accordingly, the parties hereto hereby agree as follows:

         Section 1.  Definitions.  Except as otherwise defined in this Amendment
No. 1, terms defined in the Credit Agreement are used herein as defined therein.

         Section 2. Amendments.  Subject to the execution and delivery hereof by
the Company,  the Majority  Lenders and the Agent, and the consent and agreement
hereto by the Subsidiary  Guarantors,  but effective as of the date hereof,  the
Credit Agreement is hereby amended as follows:

         A. General. References in the Credit Agreement to "this Agreement" (and
indirect references such as "hereunder"  "hereby",  "herein" and "hereof") shall
be deemed to be references to the Credit Agreement as amended hereby.

         B. Definitions.

         (a)  Section 1.1 of the Loan  Agreement  shall be amended by adding the
following new definition thereto to read as follows:

                  "Acquired Debt" shall mean, with respect to the Company or any
         Subsidiary, Indebtedness of any other Person, existing at the time such
         other Person  merged with or into or became a Subsidiary of the Company
         or any Subsidiary  thereof in connection with a Permitted  Acquisition,
         provided  that (i) such  Indebtedness  was not  created  by such  other
         Person in  contemplation  of such  acquisition  and (ii) the  aggregate
         outstanding principal amount of such Indebtedness shall not at any time
         exceed $7,500,000.

         (b) The  definition of "Permitted  Indebtedness"  in Section 1.1 of the
Credit  Agreement  shall be amended by (i) deleting  the word "and"  immediately
after the semicolon at the end of paragraph (viii) thereof, (ii) adding the word
"and" immediately after the semicolon at the end of paragraph (ix) thereof,  and
(iii) adding a new paragraph (x) thereto to read as follows:  "(x) Acquired Debt
of the Company or any Subsidiary;"



<PAGE>


                                       -2-

         C.  Liens.  Section  9.13 of the Credit  Agreement  shall be amended by
amending clause (iii) thereto in its entirety to read as follows:

         (iii) (A)  Liens  contemplated  by  clauses  (ii),  (iv) and (v) of the
         definition of Permitted  Indebtedness;  and (B) Liens securing Acquired
         Debt,  provided  that such  Liens  cover only  those  assets  that were
         covered by such Liens prior to the relevant acquisition;

         Section 3.  Representations and Warranties.  The Company represents and
warrants to the Lenders that, after giving effect to the Waiver dated as of even
date  herewith  among the  Company,  the  Majority  Lenders  and the Agent,  and
consented to by the Subsidiary Guarantors:

         (a) no Default has occurred and is continuing; and

         (b) the  representations and warranties made by each of the Company and
the  Subsidiary  Guarantors in each Basic Document to which it is a party (other
than the  representations and warranties set forth in Section 8.10 of the Credit
Agreement) are true on and as of the date hereof, with the same force and effect
as if  made  on and as of  such  date  and as if  each  reference  in the  Basic
Documents to "this Agreement" or "the Credit  Agreement"  included  reference to
this Amendment No. 1.

         Section  4.  Miscellaneous.  Except  as  herein  provided,  the  Credit
Agreement  shall remain  unchanged and in full force and effect.  This Amendment
No. 1 may be executed in any number of counterparts, all of which taken together
shall  constitute one and the same amendatory  instrument and any of the parties
hereto may execute this  Amendment No. 1 by signing any such  counterpart.  This
Amendment No. 1 shall be governed by, and construed in accordance  with, the law
of the State of New York.

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1
to be duly executed and delivered as of the day and year first above written

                                      THE COMPANY:

                                      IRON MOUNTAIN INCORPORATED


                                      By:  /s/ J.P. Lawrence
                                           Title:  VP, Treasurer


<PAGE>


                                       -3-


                                      THE LENDERS:

                                      THE CHASE MANHATTAN BANK


                                      By:  /s/ Carol A. Ulmer
                                           Title:  Vice President

                                      BANKBOSTON, N.A.


                                      By:
                                           Title:

                                      THE BANK OF NEW YORK


                                      By:  /s/ Thomas C. McCrohan
                                            Title:  Assistant Vice President
                                      
                                      CIBC INC.
                                      
                                      
                                      By:  /s/ Colleen Risorto
                                            Title:  Executive Director

                                      FLEET NATIONAL BANK
                                      
                                      
                                      By:_________________________
                                            Title:
                                      
                                      CREDIT LYONNAIS NEW YORK BRANCH
                                      

                                      By:  /s/ Vladimir Labun
                                           Title: First Vice President - Manager
                                      
                                      THE SUMITOMO BANK, LIMITED
                                      
                                      
                                      By:_________________________
                                            Title:



<PAGE>


                                       -4-

                                      UNION BANK OF CALIFORNIA, N.A.
                                      
                                      
                                      By:_________________________
                                            Title:
                                      
                                      THE BANK OF NOVA SCOTIA
                                      

                                      By:_________________________
                                            Title:
                                      
                                      HELLER FINANCIAL, INC.
                                      
                                      
                                      By:  /s/ Patrick Hayes
                                            Title:  Vice President

                                      NATIONAL CITY BANK
                                      
                                      
                                      By:_________________________
                                            Title:
                                      
                                      GIROCREDIT BANK AG DER
                                         SPARKASSEN, GRAND CAYMAN
                                         ISLAND BRANCH
                                      
                                      By:_________________________
                                            Title:
                                      
                                      THE ADMINISTRATIVE AGENT
                                      
                                      THE CHASE MANHATTAN BANK, as
                                      Administrative Agent
                                      
                                      
                                      By:  /s/ Carol A. Ulmer
                                           Title:  Vice President
                                      
                                      
                                      

<PAGE>


                                       -5-
CONSENTED TO AND AGREED:

IRON MOUNTAIN RECORDS MANAGEMENT, INC.
IRON MOUNTAIN/SAFESITE, INC.
DATA SECURITIES INTERNATIONAL, INC.
IM-3 ACQUISITION CORP.
CRITERION PROPERTY, INC.
CRITERION ATLANTIC PROPERTY, INC.
HOLLYWOOD PROPERTY, INC.
IRON MOUNTAIN DATA PROTECTION
   SERVICES, INC.
IRON MOUNTAIN CONSULTING SERVICES, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF OHIO, INC.
METRO BUSINESS ARCHIVES, INC.
IM SAN DIEGO, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF MARYLAND, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF FLORIDA, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF MISSOURI LLC
IRON MOUNTAIN RECORDS MANAGEMENT
   OF BOSTON, INC.
IRON MOUNTAIN WILMINGTON, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF MINNESOTA, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF MICHIGAN, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   WISCONSIN, INC.
WILLAMETTE ARCHIVES, INC.
CRITICAL FILES SECURITY, INC.
IM EARHART, INC.
IM BILLERICA, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF SAN ANTONIO, INC.
IRON MOUNTAIN RECORDS MANAGEMENT
   OF SAN ANTONIO-FP, INC.
IM-AEI ACQUISITION CORP.
ARCHIVES EXPRESS INCORPORATED


By:  /s/ J.P. Lawrence
     Title:  VP, Treasurer


                                                                    Exhibit 10.8


                           IRON MOUNTAIN INCORPORATED

                        1998 EMPLOYEE STOCK PURCHASE PLAN


1.       PURPOSE

         The purpose of this 1998 Employee  Stock  Purchase Plan (the "Plan") is
to provide  employees of Iron  Mountain  Incorporated  (the  "Company")  and its
Subsidiaries the opportunity to acquire a proprietary interest in the Company by
providing  favorable terms for them to purchase its stock. This Plan is intended
to qualify as an employee stock purchase plan within
the meaning of Section 423 of the Code.

2.       DEFINITIONS

         (a)  "Compensation"  shall mean the amount reported (or to be reported)
in Box 1 of Form W-2,  or its  equivalent,  increased  by any  salary  reduction
elected pursuant to Sections 402(g) or 125 of the Code.

         (b) "Board" shall mean the Board of Directors of the Company.

         (c) "Code" shall mean the Internal Revenue Code of 1986, as amended.

         (d) "Committee" shall have the meaning set forth in Section 3.

         (e) "Common Stock" shall mean the shares of the Company's common stock,
$0.01 par value per share.

         (f) "Employee"  shall mean any  individual who is customarily  employed
for more than twenty hours per week and more than five months in a calendar year
by the Company or any Subsidiary.  The term Employee shall not include:  (i) any
individual who is not a common law employee of the Company or a Subsidiary; (ii)
any  Employee who owns,  directly or  indirectly,  as of the Offering  Date five
percent or more of the Company or a Subsidiary;  and (iii) any Employee who is a
member of a  collective  bargaining  unit with which the Company or a Subsidiary
has bargained in good faith with respect to  participation  in the Plan and as a
result of such bargaining the labor  organization  made an affirmative  decision
not to participate in the Plan.

         (g) "Exercise Date" shall, unless changed by the Committee, mean August
31,  1999 and each  August 31  thereafter  while  the Plan  remains  in  effect;
provided,  however,  that if August 31 is not a business  day, the Exercise Date
shall be the business day immediately preceding August 31.

         (h) "Exchange Act" shall mean the  Securities  Exchange Act of 1934, as
amended.


<PAGE>


                                       -2-


         (i) "Fair Market Value" shall be determined  according to the following
rules:  (i) if the Common Stock is not at the time listed or admitted to trading
on a stock exchange or the Nasdaq National  Market,  the fair market value shall
be the  closing  price  of the  Common  Stock  on the  date in  question  in the
over-the-counter  market,  as such price is reported in a publication of general
circulation  selected  by the Board  and  regularly  reporting  the price of the
Common Stock in such market; provided,  however, that if the price of the Common
Stock is not so  reported,  the fair market  value shall be  determined  in good
faith by the Board, which may take into consideration (1) the price paid for the
Common Stock in the most recent trade of a substantial number of shares known to
the Board to have  occurred at arm's length  between  willing and  knowledgeable
investors,  or (2) an appraisal by an independent party, or (3) any other method
of valuation  undertaken in good faith by the Board, or some or all of the above
as the Board shall in its  discretion  elect;  or (ii) if the Common Stock is at
the time  listed or  admitted  to  trading on any stock  exchange  or the Nasdaq
National Market, then the fair market value shall be the mean between the lowest
and  highest  reported  sale  prices (or the lowest  reported  bid price and the
highest reported asked price) of the Common Stock on the date in question on the
principal  exchange  on which the Common  Stock is then  listed or  admitted  to
trading. If no reported sale of Common Stock takes place on the date in question
on the principal  exchange or the Nasdaq  National  Market,  as the case may be,
then the reported  closing sale price (or the reported  closing  asked price) of
the  Common  Stock on such prior date on the  principal  exchange  or the Nasdaq
National  Market,  as the case may be,  shall be  determinative  of fair  market
value.

         (j) "Insider" shall mean a person subject to Section 16 of the Exchange
Act.

         (k)  "Offering"  shall mean any offering of Common Stock in  accordance
with Section 7.

         (l)  "Offering  Date"  shall,  unless  changed by the  Committee,  mean
September  1, 1998 and each  September 1  thereafter  while the Plan  remains in
effect;  provided,  however,  that if  September  1 is not a business  day,  the
Offering Date shall be the business day immediately preceding September 1.

         (m) "Option" shall mean the right of a Participant  to purchase  Common
Stock pursuant to an Offering.

         (n) "Option Price" shall have the meaning set forth in Section 8.

         (o) "Optionee" shall mean any individual who has been granted an Option
that  remains  outstanding  under the terms of any  Offering  or who owns Common
Stock as a result of an Offering.

         (p)  "Participant"  shall mean an Employee  who has in effect a payroll
deduction authorization in accordance with Section 6.



<PAGE>


                                       -3-

         (q) "Securities Act" shall mean the Securities Act of 1933, as amended.

         (r)  "Subsidiary"  shall mean a corporation  of which the Company owns,
directly or indirectly through an unbroken chain of ownership,  fifty percent or
more of the total combined voting power of all classes of stock,  whether or not
such corporation now exists or is hereafter organized or acquired by the Company
or a Subsidiary.

3.       ADMINISTRATION OF THE PLAN

         The Plan shall be  administered  by the Board or, in the  discretion of
the Board, a committee  composed of at least two  individuals who may be members
of the Board or employees of the Company or a Subsidiary (the  "Committee").  In
the event that a vacancy on the Committee  occurs on account of the  resignation
of a member or the removal of a member by vote of the Board, a successor  member
shall be appointed  by vote of the Board.  No member of the  Committee  shall be
liable for any action or  determination  made in good faith with  respect to the
Plan. All references in the Plan to the "Committee" shall be understood to refer
to the Committee or the Board, whoever shall administer the Plan.

         The  Committee  shall  select one of its members as Chairman  and shall
hold  meetings at such times and places as it may  determine.  A majority of the
Committee shall constitute a quorum, and acts of the Committee at which a quorum
is present,  or acts reduced to or approved in writing by all the members of the
Committee,  shall be the valid acts of the Committee.  The Committee  shall have
the authority to adopt,  amend and rescind such rules and regulations as, in its
opinion,  may be advisable in the  administration  of the Plan. All questions of
interpretation and application of such rules and regulations, of the Plan and of
Options  granted  thereunder  shall  be  subject  to  the  determination  of the
Committee, which shall be final and binding.

         The Committee  shall have the  authority,  without the need for further
approval, to establish a different Offering Date and/or Exercise Date, to modify
the amount of time between an Offering Date and an Exercise Date and to increase
the number of Offerings in a year.

         With respect to Insiders,  transactions  under the Plan are intended to
comply with all applicable  conditions of Rule 16b-3 or its successor  under the
Exchange Act. To the extent any provision of the Plan or action by the Committee
fails to so comply,  it shall be deemed to be modified so as to be in compliance
with such Rule, or, if such modification is not possible,  it shall be deemed to
be null and void,  to the extent  permitted  by law and deemed  advisable by the
Committee.

4.       OPTION SHARES

         The total amount of Common  Stock with respect to which  Options may be
granted  under the Plan shall not exceed in the  aggregate  250,000  shares from
either  authorized but unissued shares or treasury  shares;  provided,  however,
that  such  aggregate  number  of  shares  shall be  subject  to  adjustment  in
accordance with Section 16. If any outstanding Option


<PAGE>


                                       -4-

expires for any reason,  or  terminates by reason of the severance of employment
of the Participant or any other cause,  or is surrendered,  the shares of Common
Stock  allocable  to the  unexercised  portion  of the  Option may again be made
subject to an Option under the Plan.

5.       ELIGIBILITY

         An Employee  shall be eligible to become a  Participant  in the Plan on
any  Offering  Date on which he is  employed  by the  Company  or a  Subsidiary;
provided, however, that no Employee shall be granted an Option:

                  (i) if  immediately  after the grant the  aggregate  amount of
         stock that he would own, or would be  considered  to own under  Section
         424(d) of the Code,  or would hold  outstanding  options  to  purchase,
         would represent five percent or more of the total combined voting power
         or value of all  classes  of  capital  stock of the  Company  or of any
         Subsidiary; or

                  (ii) that  permits  his  right to  purchase  shares  under all
         employee stock purchase plans (within the meaning of Section 423 of the
         Code) of the  Company  and its  Subsidiaries  to  accrue at a rate that
         exceeds  $25,000 for any calendar year,  determined by reference to the
         Fair Market Value of the shares at the time the Option is granted.

6.       PARTICIPATION

         (a) An  Employee  may become a  Participant  in any future  Offering by
completing  an  authorization  for payroll  deductions  in  connection  with the
Offering  at such time  (prior to the  Offering  Date) and in such manner as the
Committee may prescribe.  Payroll deductions  pursuant to an authorization shall
commence with the payroll period in which the Offering Date occurs and shall end
with the last payroll  completed  prior to the Exercise Date for the Offering to
which the authorization  applies,  unless the authorization is sooner terminated
by the  Participant as provided in Section 10. The Committee may provide that in
the case of the first Offering, payroll deductions shall commence with the first
payroll period ending after the initial  Offering  Date. All payroll  deductions
shall be made on an after-tax basis.

         (b)  A  Participant  shall  elect  in  his  authorization  for  payroll
deduction to have  deductions  made from his  Compensation  on each payday in an
amount  equal  to a whole  percentage  of from  one to  fifteen  percent  of his
Compensation. All payroll deductions made for a Participant shall be credited to
a  bookkeeping  account  maintained  for him under the Plan.  In no event  shall
interest be paid to a Participant with respect to payroll deductions credited to
his account, whether such deductions are used in connection with the exercise of
an Option or are returned to the Participant or his estate in cash.

         (c) Except as may be  required by law, a  Participant  may not make any
payments to his account other than by his authorization for payroll deduction. A
Participant may elect to decrease his payroll deduction rate at such time and in
such manner as the  Committee  may  prescribe.  In no event shall a  Participant
increase the amount of his payroll deductions during


<PAGE>


                                       -5-

an Offering.  A Participant may discontinue his participation in the Offering as
provided in Section 10.

7.       GRANT OF OPTIONS

         (a) Options  under the Plan shall be granted in a series of  Offerings,
the first of which shall begin on September 1, 1998.  Successive Offerings shall
begin on each Offering Date  thereafter  until all of the shares of Common Stock
available under the Plan are exhausted or until the Plan is terminated  pursuant
to Section 19 or Section 20.  Participation by an Employee in any Offering shall
neither limit nor require his participation in any other Offering.

         (b)  Each  Participant  in an  Offering  shall  be  granted,  as of the
applicable  Offering  Date, an Option to purchase that number of whole shares of
Common Stock that the  accumulated  payroll  deductions  credited to his account
during the Offering is able to purchase at the Option Price.

         (c) If the total  number of shares for which  Options are to be granted
as of any Offering  Date exceeds the number of shares then  available  under the
Plan, the Committee shall make a pro rata allocation of the available  shares in
a manner as nearly  uniform  as  practicable,  and as it shall  determine  to be
equitable.  In that event, the payroll deductions made or to be made pursuant to
authorizations for that Offering shall be reduced accordingly, and the Committee
shall give written notice of such reduction to each affected Participant.

         (d) In no  event  shall a  Participant  be  granted  an  Option  in any
Offering to acquire  more than that number of whole shares of Common Stock equal
to $25,000  divided by the Fair  Market  Value of the shares as of the  Offering
Date;  provided,  however,  that such limit  shall be subject to  adjustment  in
accordance with Section 16.

8.       OPTION PRICE

         The Option Price of shares of Common  Stock for any  Offering  shall be
the lesser of: (a) eighty-five percent of the Fair Market Value of the shares on
the Offering  Date; or (b)  eighty-five  percent of the Fair Market Value of the
shares on the Exercise Date.

9.       EXERCISE OF OPTIONS

         (a)  A   Participant's   Option  for  an  Offering  will  be  exercised
automatically  as of the Exercise  Date for the Offering to purchase that number
of whole  shares of Common  Stock equal to the  accumulated  payroll  deductions
credited to his account as of the Exercise Date divided by the Option Price.

         (b) A Participant may elect prior to the Exercise Date at such time and
in such manner as the Committee may prescribe to receive in cash an amount equal
to the  accumulated  payroll  deductions  in his account on the  Exercise  Date,
rather than exercising his Option.


<PAGE>


                                       -6-


         (c) As promptly as  practicable  after each  Exercise  Date the Company
shall  deliver to each  Participant  in the  Offering,  in  accordance  with his
election,  either (a) the shares  purchased  upon the  exercise  of his  Option,
together  with a cash  payment  equal to the balance of any  payroll  deductions
credited to his account  during the Offering that were not used for the purchase
of shares,  other than amounts  representing  fractional  shares,  or (b) a cash
payment  equal to the total of the  payroll  deductions  credited to his account
during  the  Offering.  Amounts  representing  fractional  shares  will,  at the
discretion  of the  Committee,  either be  carried  forward  for use in the next
Offering if the  Participant  will  participate  in that Offering or paid to the
Participant in cash.

         (d) The shares  purchased upon exercise of an Option shall be deemed to
be transferred to the Participant on the Exercise Date.

10.      WITHDRAWAL FROM OFFERING

         A  Participant  may at any time prior to the Exercise Date at such time
and in such manner as the Committee may prescribe  withdraw from an Offering and
request  payment  to him of an amount in cash equal to the  accumulated  payroll
deductions  credited to his account under the Plan.  Such amount will be paid to
the  Participant  as promptly  as  practicable  after  receipt of his request to
withdraw,  and no further payroll  deductions will be made from his Compensation
with respect to the Offering then in progress and any  outstanding  Option shall
be cancelled.  A  Participant's  withdrawal from an Offering will have no effect
upon  his  eligibility  to  participate  in any  subsequent  Offering  or in any
employee  stock  purchase  plan  (within the meaning of Section 423 of the Code)
that may hereafter be adopted by the Company or a Subsidiary.

11.      EXPIRATION OF OPTIONS ON TERMINATION OF EMPLOYMENT

         Options  shall  not be  transferable  by a  Participant  and no  amount
credited to a  Participant's  account may be assigned,  transferred,  pledged or
otherwise  disposed  of in any way by a  Participant.  An  Option  shall  expire
unexercised immediately if a Participant ceases to satisfy the definition of the
term  Employee  for any  reason  other  than his  death  and the  amount  of the
accumulated  payroll deductions then credited to his account under the Plan will
be paid to him in cash. Upon  termination of the  Participant's  employment with
the Company or a Subsidiary  for any reason other than death,  an amount in cash
equal to the accumulated  payroll  deductions then credited to his account under
the  Plan  will be  paid to him.  In the  case  of a  Participant's  death,  the
provisions of Section 17 shall control.

         An  authorized  leave of absence or absence on military  or  government
service shall not constitute  severance of the employment  relationship  between
the Company or Subsidiary and the  Participant  for purposes of this Section 11,
provided that either (a) the absence is for a period of no more than ninety days
or (b) the Employee's  right to be  re-employed  after the absence is guaranteed
either by statute or by contract.



<PAGE>


                                       -7-

12.      REQUIREMENTS OF LAW

         The Company shall not be required to sell or issue any shares of Common
Stock under the Plan if the issuance of such shares would  constitute  or result
in a  violation  by the  Optionee or the  Company of any  provision  of any law,
statute or regulation of any governmental authority. Specifically, in connection
with the  Securities  Act, upon the exercise of any Option the Company shall not
be required to issue shares unless the Board has received evidence  satisfactory
to it to the effect that the  Optionee  will not  transfer  such  shares  except
pursuant to a  registration  statement  in effect  under the  Securities  Act or
unless an opinion of counsel  satisfactory  to the Company has been  received by
the  Company  to  the  effect  that  such  registration  is  not  required.  Any
determination  in this  connection  by the  Board  shall be final,  binding  and
conclusive. The Company shall not be obligated to take any affirmative action to
cause the exercise of an Option or the issuance of shares  pursuant to an Option
to comply with any laws or regulations of any governmental  authority including,
without limitation, the Securities Act or applicable state securities laws.

13.      RESTRICTIONS ON TRANSFER

         A  Participant  may not sell,  assign,  pledge,  encumber or  otherwise
transfer  Common Stock acquired  pursuant to the exercise of an Option until the
second day  following  the first  anniversary  of the Exercise Date on which the
shares  were  purchased;  provided,  however,  that the  Committee  may,  in its
discretion,  lengthen, shorten or eliminate entirely this restriction. The stock
certificate or certificates evidencing shares of Common Stock issued pursuant to
the  exercise of an Option  shall bear a legend  setting  forth any  restriction
described in this Section.

14.      NO RIGHTS AS STOCKHOLDER

         No  Participant  shall have  rights as a  stockholder  with  respect to
shares covered by his Option until the applicable  Exercise Date and,  except as
otherwise  provided in Section 16, no adjustment  shall be made for dividends of
which the record date precedes the applicable Exercise Date.

15.      FORFEITURE FOR DISHONESTY

         Notwithstanding  anything  to the  contrary  in the Plan,  if the Board
determines,  after full  consideration  of the facts presented on behalf of both
the Company  and the  individual,  that a  Participant  or an Optionee  has been
engaged  in  fraud,  embezzlement,  theft,  commission  of a  felony  or  proven
dishonesty in the course of his employment by the Company or a Subsidiary, which
damaged the  Company or  Subsidiary,  or has  disclosed  trade  secrets or other
proprietary  information of the Company or a Subsidiary,  (a) such  individual's
participation  in an Offering shall  terminate and he shall forfeit his right to
receive any Common Stock pursuant to an Offering that has not yet been delivered
and (b) the Company  shall have the right to  repurchase  all or any part of the
shares of Common Stock acquired by an Optionee upon the earlier  exercise of any
Option,  at a price equal to the amount paid to the Company upon such  exercise,
increased  by an amount  equal to the  interest  that would have  accrued in the
period


<PAGE>


                                       -8-

between the date of exercise of the Option and the date of such  repurchase upon
a debt in the amount of the exercise price, at the prime rate(s)  announced from
time to time  during  such period in the  Federal  Reserve  Statistical  Release
Selected  Interest  Rates.  The  decision  of the  Board  as to the  cause  of a
Participant's  or  Optionee's  discharge and the damage done to the Company or a
Subsidiary  shall be final,  binding and  conclusive.  No decision of the Board,
however,  shall  affect  in  any  manner  the  finality  of the  discharge  of a
Participant or Optionee by the Company or a Subsidiary.

16.      CHANGES IN THE COMPANY'S CAPITAL STRUCTURE

         (a) In the  event  that the  outstanding  shares  of  Common  Stock are
hereafter  changed for a different  number or kind of shares or other securities
of the Company,  by reason of a  reorganization,  recapitalization,  exchange of
shares,  stock  split,  combination  of shares or dividend  payable in shares or
other securities,  a corresponding  adjustment shall be made by the Committee in
the number  and kind of shares or other  securities,  and in the  Option  Price,
covered by outstanding  Options,  and for which Options may be granted under the
Plan; provided,  however, that no adjustment shall be made that would constitute
a modification  as defined in Section 424 of the Code. Any such  adjustment made
by the  Committee  shall be  conclusive  and binding upon all affected  persons,
including the Company and all Participants and Optionees.

         (b) If while unexercised  Options remain outstanding under the Plan the
Company merges or consolidates with a wholly-owned subsidiary for the purpose of
reincorporating  itself under the laws of another  jurisdiction,  the  Optionees
will be entitled to acquire shares of Common Stock of the reincorporated Company
upon the same terms and conditions as were in effect  immediately  prior to such
reincorporation (unless such reincorporation  involves a change in the number of
shares  or the  capitalization  of  the  Company,  in  which  case  proportional
adjustments  shall be made as provided  above),  and the Plan,  unless otherwise
rescinded by the Board, will remain the Plan of the reincorporated Company.

         (c) Except as otherwise provided in the preceding  paragraph,  if while
unexercised  Options  remain  outstanding  under the Plan the Company  merges or
consolidates  with one or more  corporations  (whether or not the Company is the
surviving  corporation),  or is  liquidated  or sells or  otherwise  disposes of
substantially  all of its assets to another entity,  or upon a Change of Control
(as defined herein), then the Committee,  in its discretion,  shall provide that
either:

                  (i) after the  effective  date of such merger,  consolidation,
         liquidation,  sale or  Change  of  Control,  as the case  may be,  each
         Optionee  shall be entitled,  upon  exercise of an Option to receive in
         lieu of shares of Common  Stock the  number and class of shares of such
         stock or other securities to which he would have been entitled pursuant
         to the terms of the merger, consolidation,  liquidation, sale or Change
         of  Control if he had been the holder of record of the number of shares
         of Common Stock as to which the Option is being exercised; or



<PAGE>


                                       -9-

                  (ii) all outstanding  Options shall be exercised as of the day
         preceding  the  effective  date  of  any  such  merger,  consolidation,
         liquidation, sale or Change of Control, which day shall be the Exercise
         Date  for  purposes  of the  Offering;  provided,  however,  that  each
         Optionee  shall be notified of the right to withdraw  from the Offering
         in accordance with the requirements of Section 10.

         (d) A  "Change  of  Control"  of the  Company  shall be  deemed to have
occurred  if any person (as such term is used in Section  13(d) and  14(d)(2) of
the  Exchange  Act)  other  than a trust  related to an  employee  benefit  plan
maintained by the Company  becomes the  beneficial  owner (within the meaning of
Rule 13d-3 under the  Exchange  Act) of fifty  percent or more of the  Company's
outstanding  Common  Stock,  and within the  period of  twenty-four  consecutive
months immediately thereafter, individuals other than (a) individuals who at the
beginning  of such  period  constitute  the  entire  Board of  Directors  or (b)
individuals  whose  election,  or  nomination  for  election  by  the  Company's
stockholders,  was approved by a vote of at least  two-thirds  of the  directors
then still in office who were directors at the beginning of the period, become a
majority of the Board of Directors.

         (e) Except as  expressly  provided to the  contrary in this Section 16,
the issuance by the Company of shares of stock of any class for cash or property
or for  services,  either  upon  direct  sale or upon the  exercise of rights or
warrants, or upon conversion of shares or obligations of the Company convertible
into such  shares or other  securities,  shall not affect the  number,  class or
price of shares of Common Stock then subject to outstanding Options.

17.      DISPOSITION OF ACCOUNT AT DEATH

         In the event that a Participant dies after the Exercise Date but before
the delivery of the stock  certificates,  such certificates when issued together
with any cash remaining in the Participant's account shall be transferred to the
Participant's estate. In the event that a Participant dies prior to the Exercise
Date, a payment shall be made to the  Participant's  estate of an amount in cash
equal  to the  accumulated  payroll  deductions  credited  to the  Participant's
account under the Plan; provided,  however, that the executor,  administrator or
personal  representative  of the estate of the  Participant may by notice to the
Committee in the form and manner  prescribed by the  Committee  request that the
balance of the  Participant's  account shall be used to exercise on the Exercise
Date the outstanding  Option granted prior to the Participant's  death. Any such
election by the executor, administrator or personal representative shall be made
not later than the Exercise Date. The Company shall transfer such shares and any
cash remaining in the  Participant's  account to the executor,  administrator or
personal representative of the estate of the Participant.

18.      MISCELLANEOUS

         (a)  Accumulated  payroll  deductions and the proceeds from the sale of
shares pursuant to the exercise of Options shall constitute general funds of the
Company.



<PAGE>


                                      -10-

         (b) To the extent  required by law, the Company or a  Subsidiary  shall
withhold  or cause to be  withheld  income and other  taxes with  respect to any
income  recognized  by an  Optionee by reason of the  exercise of an Option.  An
Optionee  shall  agree that if the amount  payable to him by the Company and any
Subsidiary in the ordinary  course is  insufficient  to pay such taxes,  then he
shall upon  request of the Company pay to the  Company an amount  sufficient  to
satisfy its tax withholding obligations.

         (c) All notices or other communications by a Participant or Optionee to
the  Company  pursuant  to the Plan  shall be  deemed to have  been  given  when
received in the form  specified  by the Company at the location or by the person
designated by the Company for the receipt thereof.

         (d)  Neither  the Plan nor the grant of an Option  pursuant to the Plan
shall  impose  upon the  Company or a  Subsidiary  any  obligation  to employ or
continue to employ any Participant, and the right of the Company or a Subsidiary
to terminate the employment of any person shall not be diminished or affected by
reason of the fact that an Option has been granted to him.

         (e) The title of the sections of the Plan are included for  convenience
only and shall not be construed as modifying or affecting their provisions.  The
masculine gender shall include both sexes; the singular shall include the plural
and the plural the singular unless the context otherwise requires.

         (f) The Plan shall be governed by and construed in accordance  with the
laws of the Commonwealth of  Massachusetts,  without regard to the principles of
conflicts of law.

19.      AMENDMENT OR TERMINATION OF PLAN

         The Board may at any time terminate or from time to time amend,  modify
or suspend this Plan (or any part thereof);  provided, however, that without the
further  approval  of the  holders of a majority  of the  outstanding  shares of
Common Stock,  there shall be no: (a) material increase in the benefits accruing
to Participants under the Plan or any  "modifications,"  as that term is defined
in Section 424 (or its  successor)  of the Code, if such increase in benefits or
modifications  would  adversely  affect (i) the  availability to the Plan of the
protections  of Section 16(b) of the Exchange Act, if applicable to the Company,
or (ii) the  qualification of the Plan as an employee stock purchase plan within
the  meaning of Section  423 of the Code;  (b) change in the number of shares of
Common  Stock  that may be issued  under the Plan,  except by  operation  of the
provisions  of  Section  16;  (c)  change in the class of  persons  eligible  to
participate  in the  Plan;  or  (d)  other  change  in the  Plan  that  requires
stockholder  approval  under  applicable  law.   Notwithstanding  the  preceding
sentence,  the Board shall in all events have the power to make such  changes in
the Plan and the  Committee  shall in all  events  have the  power to make  such
changes in the regulations and  administrative  provisions  under the Plan or in
any  outstanding  Option as, in the opinion of counsel for the  Company,  may be
necessary or appropriate  from time to time to enable the Plan and any Option to
qualify as an  employee  stock  purchase  plan as defined in Section  423 of the
Code, so as to receive preferential  federal income tax treatment.  No amendment
shall adversely affect outstanding Options without the


<PAGE>


                                      -11-

consent  of the  Optionee  and the  termination  of the Plan will not  terminate
Options then outstanding, without the consent of the Optionee.

         Notwithstanding  the  foregoing,  at such time after the Company is not
required to file periodic  reports  under the Exchange  Act, at its option,  the
Company may terminate  the Plan and upon the  termination,  outstanding  Options
shall be cancelled and each Participant shall receive in cash an amount equal to
the accumulated payroll deductions  credited to the Participant's  account under
the Plan immediately prior to termination.


20.      EFFECTIVE DATE AND DURATION OF THE PLAN

         The Plan  shall be  effective  as of April  1,  1998,  subject  only to
ratification by the holders of a majority of the  outstanding  shares of capital
stock present, or represented,  and entitled to vote thereon (voting as a single
class) at a duly held meeting of the  shareholders  of the Company within twelve
months after such date. Unless the Plan shall have terminated earlier,  the Plan
shall  terminate on August 31, 2003 (or, if that date is not a business day, the
business day  immediately  preceding  August 31,  2003),  and no Option shall be
granted pursuant to the Plan after that date.




                                                                      Exhibit 21

                       LIST OF SUBSIDIARIES OF REGISTRANT


<TABLE>
<CAPTION>
                                Subsidiaries                                      Jurisdiction of Incorporation

<S>                                                                                            <C>
Iron Mountain Records Management, Inc.                                                          DE
Data Securities International, Inc.                                                             DE
Iron Mountain/Safesite, Inc.                                                                    DE
Iron Mountain Records Management of Ohio, Inc.                                                  DE
IM San Diego, Inc.                                                                              DE
Iron Mountain Consulting Services, Inc.                                                         DE
Iron Mountain Records Management of San Antonio-FP, Inc.                                        DE
Iron Mountain Records Management of San Antonio, Inc.                                           DE
Criterion Atlantic Property, Inc.                                                               DE
Hollywood Property, Inc.                                                                        CA
IM Earhart, Inc.                                                                                DE
IM Billerica                                                                                    MA
Iron Mountain Records Management of Michigan, Inc.                                              DE
Iron Mountain Safe Deposit Corp.                                                                MI
National Underground Storage Inc.                                                               PA
Iron Mountain Records Management of Maryland, Inc.                                              DE
Iron Mountain Records Management of Missouri, LLC                                               DE
Arcus Data Security, Inc.                                                                       DE
Towler Data Services, Inc.                                                                      OK
Arcus Data Security Limited (UK)                                                               (UK)
HIMSCORP of Philadelphia, Inc.                                                                  DE
HIMSCORP of Pittsburgh, Inc.                                                                    DE
HIMSCORP of New Orleans, Inc.                                                                   DE
HIMSCORP of San Diego, Inc.                                                                     DE
HIMSCORP of Los Angeles, Inc.                                                                   DE
Recordkeepers, Inc.                                                                             MD
HIMSCORP of Cleveland, Inc.                                                                     DE
HIMSCORP of Portland, Inc.                                                                      DE


                                                    

<PAGE>


<CAPTION>
                                Subsidiaries                                      Jurisdiction of Incorporation
<S>                                                                                            <C>
HIMSCORP of Detroit, Inc.                                                                       DE
HIMSCORP of Houston, Inc.                                                                       DE
Copyright, Inc.                                                                                 DE
IM-AEI Acquisition Corp.                                                                        DE
Iron Mountain Records Management of Utah, Inc.                                                  DE
Arcus Staffing Resources, Inc.                                                                  DE
Wolf Advisory International, Inc.                                                               FL
Wolf Advisory International, Ltd.                                                               PA
Trinity Holdings Corp.                                                                          CA
</TABLE>


                                        2


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