IRON MOUNTAIN INC/PA
424B3, 2000-02-08
PUBLIC WAREHOUSING & STORAGE
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(3)
                                                 Registration File No. 333-91577

PROSPECTUS

                                  8,758,730 SHARES

                           IRON MOUNTAIN INCORPORATED
                     (formerly known as Pierce Leahy Corp.)

                                  COMMON STOCK
                               ------------------

SELLING SHAREHOLDERS

    - The selling shareholders do not have any present intention to sell any
      shares. This prospectus relates to the reoffer and resale of shares
      received in the merger of Iron Mountain Incorporated with and into Pierce
      Leahy Corp. by the selling shareholders identified in this prospectus for
      their own account. We will not receive any of the proceeds from the
      reoffering and resale of the shares.

    - Depending upon the selling shareholders' continuing review of their
      respective investments and various other facts, the selling shareholders
      may, subject to any applicable securities laws, sell all or any part of
      the offered shares.

    - We have not filed the registration statement of which this prospectus
      forms a part because of any present intention of the selling shareholders
      to sell any of the offered shares. Rather, the selling shareholders may
      pledge all or a part of the offered shares they hold to one or more banks
      or brokerage houses as collateral for loans to them in the same manner as
      they did prior to the merger of Iron Mountain Incorporated with and into
      Pierce Leahy Corp. In the event of a default under a loan to a selling
      shareholder that is secured by the pledge of offered shares, the lender
      will have the right to cause the sale of the offered shares under the
      registration statement relating to this prospectus.
                             ---------------------

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

    Our shares are traded on the New York Stock Exchange under the symbol "IRM."
On February 4, 2000, the last sale price for the shares on the NYSE was $34.81.

    Our principal place of business is 745 Atlantic Avenue, Boston,
Massachusetts 02111 and our telephone number is (617) 535-4766.

    SEE "RISK FACTORS" BEGINNING ON PAGE 3 FOR A DISCUSSION OF MATTERS YOU
SHOULD CONSIDER BEFORE YOU INVEST IN THE COMMON STOCK BEING OFFERED PURSUANT TO
THIS PROSPECTUS BY THE SELLING SHAREHOLDERS.

                The date of this prospectus is February 8, 2000.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
The Company.................................................      3

Risk Factors................................................      3

Use of Proceeds.............................................      8

Selling Shareholders........................................      8

Plan of Distribution........................................     10

Legal Matters...............................................     11

Experts.....................................................     11

About This Prospectus.......................................     14

Where You Can Find More Information.........................     14

Incorporation of Documents by Reference.....................     14

Forward Looking Statements..................................     16
</TABLE>

                                       2
<PAGE>
                                  THE COMPANY

    On February 1, 2000, Iron Mountain Incorporated, a Delaware corporation
("Old Iron Mountain"), acquired our company, Pierce Leahy Corp., a Pennsylvania
corporation. Because the transaction was structured as a reverse merger, Old
Iron Mountain merged with and into us and we survived the merger. Prior to
February 1, 2000, we were named "Pierce Leahy Corp.," but immediately after the
merger we changed our name to Iron Mountain Incorporated. Based on the number of
shares of Old Iron Mountain and our common stock outstanding immediately prior
to the completion of the merger, former stockholders of Old Iron Mountain now
own approximately 65% of our common stock. Because of this share ownership, Old
Iron Mountain is considered the acquiring entity for accounting purposes.

    We are the world's largest records and information management services
company. Our management believes that we are the industry leader in business
records management services, off-site data security services, which is the
management of electronic records, and healthcare information management. Iron
Mountain provides storage for all major media, including paper, which is the
dominant form of records storage, and magnetic media, including computer tapes.
Our principal services provided to our storage customers include courier pick-up
and delivery, filing, retrieval and destruction of records, database management,
customized reporting and disaster recovery support. We also sell storage
materials, including cardboard boxes and magnetic media, and provide consulting,
facilities management and other outsourcing activities.

    As an international, full-service provider of records and information
management services, we provide services to over 100,000 customer accounts in 77
markets in the United States, including more than half of the Fortune 500, and
over 15,000 customer accounts in 30 markets outside the United States. Our
domestic operations employ about 7,400 people and operate nearly 500 facilities.
Outside the United States, we employ approximately 1,500 people and operate
approximately 90 facilities.

                                  RISK FACTORS

    Investment in our securities involves elements of risk. Investors should
carefully consider the following factors, among others, before investing in our
common stock.

FAILURE TO INTEGRATE OPERATIONS FOLLOWING OUR RECENT MERGER COULD REDUCE OUR
FUTURE RESULTS OF OPERATIONS.

    The integration of the operations of Old Iron Mountain and the operations
formerly conducted under the name Pierce Leahy Corp. will present a significant
challenge to our management. Old Iron Mountain operated on a more decentralized
model, while Pierce Leahy Corp. operated on a more centralized model prior to
the merger. The process of integrating the cultures, operating systems,
procedures and information technologies may involve unforeseen difficulties and
may require a disproportionate amount of our management's attention and our
financial and other resources. We can give no assurance that we will be able to
integrate and manage these operations effectively or maintain or improve the
historical financial performance of Old Iron Mountain and Pierce Leahy Corp. The
failure to successfully integrate these cultures, operating systems, procedures
and information technologies could have a material adverse effect on our results
of operations.

FAILURE TO ACHIEVE EXPECTED COST SAVINGS AND UNANTICIPATED COSTS RELATED TO OUR
RECENT MERGER COULD ADVERSELY AFFECT OUR RESULTS OF OPERATIONS.

    We are in the initial stages of our integration plan for Old Iron Mountain
and the business formerly conducted under the name Pierce Leahy Corp. The goal
is to adopt the best practices of both companies to create a new, combined
organization that is stronger and more efficient than either of the

                                       3
<PAGE>
two stand-alone companies. Our estimate of annual cost savings is $15 million,
which we believe will be realized within three years after the merger. These
savings will result primarily from:

    - elimination of redundant corporate expenses;

    - more efficient operations and utilization of real estate; and

    - reduction of workforce, primarily through attrition.

However, unanticipated future operating expenses or other adverse developments
could reduce or delay realization of these cost savings and materially affect
our results of operations.

    We will incur costs and make investments throughout the integration process,
including those necessary to achieve the expected cost savings. Because we are
in the initial stages of implementing our integration plan, our management
cannot reasonably quantify these integration costs. These expenditures will
include:

    - expenses for deployment of Old Iron Mountain's logo, trade names and
      service marks;

    - information technology investments and conversion expenses; and

    - severance payments and relocation costs for certain terminated and
      transferred employees.

Depending upon the details of the ultimate implementation of our integration
plan and the exact nature and timing of the integration costs, these costs will
be accounted for as:

    - purchase accounting reserves;

    - restructuring charges;

    - operating expenses; and/or

    - capital expenditures.

OUR PERFORMANCE MAY DECLINE IF KEY INDIVIDUALS LEAVE OUR COMPANY.

    Our success will depend on the services of certain key personnel, including
C. Richard Reese and J. Peter Pierce. The loss of the services of any of these
key persons could have a material adverse effect on our successful integration
of the merged businesses and our results of operations. J. Peter Pierce entered
into an employment agreement upon the closing of the merger. We do not have
employment agreements with any of our other executive officers. We can provide
no assurance that we will be able to retain our executive officers.

BECAUSE OF THE RISKS ASSOCIATED WITH ACQUISITIONS, WE MAY BE UNABLE TO CONTINUE
OUR GROWTH STRATEGY IN THE FUTURE.

    As part of our growth strategy, we have acquired, and expect to acquire in
the future, records and information management services businesses and related
businesses. This growth strategy involves risks, and we may be unable to pursue
this strategy in the future. For example, we may be unable to:

    - identify suitable companies to acquire; or

    - incur additional debt necessary to acquire suitable companies if we are
      unable to pay the purchase price out of working capital, common stock or
      other equity securities.

    The success of any completed acquisition depends in part on our ability to
integrate the acquired company. The process of integrating acquired businesses
may involve unforeseen difficulties and may require a disproportionate amount of
our management's attention and our financial and other resources.

                                       4
<PAGE>
    Our operating results may fluctuate from quarter to quarter due to the size,
timing and integration of future acquisitions. As a result, operating results
for any fiscal quarter may not indicate the results that may be achieved for any
subsequent quarter or for a full fiscal year.

INTERNATIONAL EXPANSION MAY POSE ADDITIONAL RISKS RESULTING FROM FOREIGN
REGULATIONS AND FOREIGN MARKETS.

    Our growth strategy involves expanding operations into international
markets, and we expect to continue this expansion. Europe and Latin America have
been our primary areas of focus for international expansion. We have entered
into joint ventures and have acquired all or a majority of the equity in
companies operating in these areas and are actively pursuing additional
opportunities. International operations are subject to numerous risks, including
the impact of foreign government regulations, political uncertainties,
differences in business practices and foreign currency fluctuations. In
particular, Pierce Leahy's historical net income has been significantly affected
by fluctuations in the Canadian dollar associated with the 8 1/8% senior notes
issued by our principal Canadian subsidiary.

OUR SUBSTANTIAL INDEBTEDNESS COULD ADVERSELY AFFECT OUR FINANCIAL HEALTH.

    We have a significant amount of indebtedness. Our substantial indebtedness
could have important consequences to you. For example, it could:

    - make us more sensitive to adverse economic conditions than some of our
      competitors with less debt;

    - limit our ability to fund future working capital, acquisitions, capital
      expenditures and other general corporate requirements; and

    - limit our flexibility in planning for, or reacting to, changes in our
      business and the records and information management services industry.

    We expect to continue to borrow under existing and future credit
arrangements in order to finance future acquisitions and for general corporate
purposes. If new debt is added to our current levels, the related risks that we
now face could intensify.

    We cannot assure you that our business will generate sufficient cash flow
from operations, that currently anticipated cost savings will be realized on
schedule or that future borrowings will be available to us under our existing
and future credit arrangements in an amount sufficient to enable us to pay our
indebtedness or to fund our other liquidity needs. We may need to refinance all
or a portion of our indebtedness on or before maturity. We cannot assure you
that we will be able to refinance any of our indebtedness on commercially
reasonable terms or at all.

WE HAVE A HISTORY OF EXPERIENCING NET LOSSES APPLICABLE TO OUR COMMON
SHAREHOLDERS AS OUR PRIMARY FINANCIAL OBJECTIVE IS TO INCREASE OUR EBITDA.

    We have a history of experiencing net losses applicable to common
shareholders. These net losses are attributable primarily to significant
non-cash charges and interest expense associated with our growth strategies,
namely:

    - depreciation expenses associated with the expansion of storage capacity;
      and

    - goodwill amortization associated with acquisitions accounted for under the
      purchase method.

    Our primary financial objective has been, and will continue to be, to
increase EBITDA, which is a source of funds to service indebtedness and for
investment in continued internal growth and growth through acquisitions, rather
than net income. Having an objective of increasing EBITDA may negatively affect
other measures of financial performance, such as net income. In addition,
execution of our growth strategy could result in future net losses due to
increased interest expense associated with borrowings and increased depreciation
and amortization expenses.

                                       5
<PAGE>
RESTRICTIONS IMPOSED BY TERMS OF OUR INDEBTEDNESS MAY ADVERSELY AFFECT OUR
ABILITY TO PURSUE OUR ACQUISITION STRATEGY.

    We entered into a new credit facility in connection with the merger. Our new
credit facility and our indentures contain covenants restricting or limiting our
ability to, among other things:

    - incur additional indebtedness;

    - pay dividends or make other restricted payments;

    - make asset dispositions;

    - permit liens; and

    - make certain investments.

    These restrictions may adversely affect our ability to pursue our
acquisition and other growth strategies.

WE FACE COMPETITION FOR CUSTOMERS AND ACQUISITION OPPORTUNITIES.

    We compete with our current and potential customers' internal records and
information management services capabilities. We can provide no assurance that
these organizations will begin or continue to use an outside company such as our
company for their future records and information management services.

    We compete with multiple records and information management services
providers in all geographic areas where we operate. We believe that competition
for customers is based on price, reputation for reliability, quality of service
and scope and scale of technology and that we generally compete effectively
based on these factors. As a result of this competition, the records and
information management services industry could experience downward pricing
pressures.

    We also compete with other records and information management services
providers for companies to acquire. Some of our competitors possess greater
financial and other resources than we do. If any such competitor were to devote
additional resources to the records and information management services business
and such acquisition candidates or focus its strategy on our markets, our
results of operations could be adversely affected.

OUR CUSTOMERS MAY SHIFT FROM PAPER STORAGE TO ALTERNATIVE TECHNOLOGIES THAT
REQUIRE LESS PHYSICAL SPACE.

    We derive most of our revenues from the storage of paper documents and
related services. This storage requires significant physical space. Alternative
storage technologies exist, many of which require significantly less space than
paper. These technologies include computer media, microform, CD-ROM and optical
disk. To date, none of these technologies has replaced paper as the principal
means for storing information. However, we can provide no assurance that our
customers will continue to store most of their records in paper format. A
significant shift by our customers to storage of data through non-paper based
technologies, whether now existing or developed in the future, could adversely
affect our business.

UNINSURED LOSSES OR DAMAGES TO OUR STORAGE FACILITIES OR THE RECORDS STORED IN
THOSE FACILITIES COULD HURT OUR BUSINESS OPERATIONS AND/OR FINANCIAL CONDITION.

    We maintain comprehensive liability, fire, flood, earthquake (where
appropriate) and extended coverage insurance with respect to the properties that
we own or lease, to the extent such insurance is available on commercially
reasonable terms, with customary limits and deductibles. We may be unable to
obtain full coverage on a cost-effective basis for some casualties, such as
earthquakes, or may be unable to obtain any insurance for certain losses, such
as losses from riots.

                                       6
<PAGE>
    In March 1997, three fires extensively damaged one and destroyed another of
Old Iron Mountain's records and information management services facilities in
South Brunswick Township, New Jersey. Some of Old Iron Mountain's customers or
their insurance carriers have asserted claims or filed lawsuits against Old Iron
Mountain as a consequence of the destruction of or damage to their records
caused by the fires. We cannot predict the outcome of these claims and
proceedings. Based on our present assessment of the situation, after
consultation with our legal counsel, we do not believe these claims will have a
material adverse effect on our financial condition or results of operations,
although we can provide no assurance.

    In the future, should uninsured losses or damages occur, we could lose both
our investment in and anticipated profits and cash flow from the affected
property and may continue to be responsible for any leasehold obligation,
mortgage indebtedness or other obligations related to such property.

BECAUSE VARIOUS LAWS MAY IMPOSE LIABILITY ON OWNERS AND OPERATORS OF REAL ESTATE
FOR A VARIETY OF ENVIRONMENTAL PROBLEMS, REGARDLESS OF FAULT, WE COULD BE
POTENTIALLY LIABLE FOR ENVIRONMENTAL COSTS ATTRIBUTABLE TO THE PROPERTIES WE OWN
OR LEASE.

    Various environmental laws impose liability on an owner of real estate for
the costs of investigation and cleanup of soil and groundwater contaminated by
certain hazardous substances or wastes or petroleum products. These laws also
impose liability on lessees conducting operations on contaminated real estate.
Some of these environmental laws impose cleanup liability without regard to
whether the owner or operator of the real estate or operations knew of or was
responsible for the contamination. Moreover, some of these laws impose liability
whether or not operations at the property have been discontinued or title to the
property has been transferred. Third parties may make claims against the owner
or operator of contaminated real estate based on damages and costs resulting
from off-site migration of the contamination. Accordingly, the presence of
contamination or the failure to properly clean up contaminated property may:

    - adversely affect our ability to sell, rent or use the property as
      collateral; or

    - subject us to third party claims.

    Certain environmental laws also govern asbestos-containing materials. These
laws may impose liability for release of asbestos-containing materials and may
enable third parties to sue owners or operators of real estate for personal
injuries associated with exposure to these substances. Although we believe that
future costs related to any removal or encapsulation of asbestos-containing
materials at our facilities will not be material, we can make no such
assurances.

    In addition, some of our current and formerly owned or operated properties
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. In some instances these properties included the
operation of underground storage tanks. We may be potentially liable for
environmental costs like those discussed above.

    We have from time to time conducted limited environmental investigations and
remedial activities at some of our former and current facilities, but we have
not undertaken an in-depth environmental review of all of our properties.

    Environmental conditions for which we might be liable may exist at our
properties or at properties that we may acquire in the future. In addition,
future regulatory action and environmental laws may impose costs for
environmental compliance that do not exist today.

                                       7
<PAGE>
                                USE OF PROCEEDS

    We will receive no proceeds from any sale of the shares offered by the
selling shareholders. The selling shareholders will receive all proceeds.

                              SELLING SHAREHOLDERS

    The selling shareholders are Kent P. Dauten, B. Thomas Golisano, C. Richard
Reese, Vincent J. Ryan and Schooner Capital LLC, a Delaware limited liability
company. Prior to the offering of shares described in this prospectus, the
selling shareholders beneficially owned the following shares. The number of
shares beneficially owned by each person is determined according to the rules of
the Securities and Exchange Commission, and the information is not necessarily
indicative of beneficial ownership for any other purpose. The percentage of
outstanding shares beneficially owned prior to the offering assumes that
54,289,541 shares were issued and outstanding immediately after the merger of
Old Iron Mountain and Pierce Leahy as of February 1, 2000, the date as of which
the information in this table is given:

<TABLE>
<CAPTION>
                                                                                      PERCENTAGE OF
                                                    SHARES         MAXIMUM NUMBER   OUTSTANDING SHARES
                                              BENEFICIALLY OWNED     OF SHARES      BENEFICIALLY OWNED
SELLING SHAREHOLDER                           PRIOR TO OFFERING    BEING OFFERED    PRIOR TO OFFERING*
- -------------------                           ------------------   --------------   ------------------
<S>                                           <C>                  <C>              <C>
Kent P. Dauten..............................       1,411,375(1)      1,409,227             2.6%
B. Thomas Golisano..........................       1,522,788(2)      1,515,213             2.8%
C. Richard Reese............................       1,690,739(3)        793,665             3.1%
Vincent J. Ryan.............................       5,042,773(4)      2,304,549             9.3%
Schooner Capital LLC........................       2,736,076(5)      2,736,076             5.0%
</TABLE>

- ------------------------

*   Includes all shares beneficially owned, not just those being offered. Except
    as otherwise indicated, the persons named in the table above have sole
    voting and investment power with respect to all shares shown as beneficially
    owned by them.

(1) Mr. Dauten is a director of Iron Mountain. Includes 2,148 shares that
    Mr. Dauten has the right to acquire pursuant to currently exercisable
    options not being offered under this prospectus.

(2) Mr. Golisano is a director of Iron Mountain. Includes 7,575 shares that
    Mr. Golisano has the right to acquire pursuant to currently exercisable
    options not being offered under this prospectus.

(3) Mr. Reese is a director and Chairman of the Board and Chief Executive
    Officer of Iron Mountain. Includes 22,825 shares of common stock held by
    trusts for the benefit of Mr. Reese's children not being offered under this
    prospectus, as to which Mr. Reese disclaims beneficial ownership. Also
    includes 874,249 shares of common stock as to which Mr. Reese shares
    beneficial ownership with Schooner Capital LLC, as a result of a 1988
    deferred compensation arrangement, as amended, between Schooner Capital LLC
    and Mr. Reese relating to Mr. Reese's former services as President of the
    predecessor corporation of Schooner Capital LLC. Pursuant to such
    arrangement, upon the earlier to occur of (a) Schooner Capital LLC's sale or
    exchange of substantially all of the shares of our common stock held by
    Schooner Capital LLC or (b) the cessation of Mr. Reese's employment with
    Iron Mountain, Schooner Capital LLC is required to transfer such shares of
    common stock to Mr. Reese or remit to Mr. Reese cash in an amount equal to
    the then current fair value of such shares of common stock. Such shares are
    included in the maximum number of shares being offered under this prospectus
    by Schooner Capital LLC. Schooner Capital LLC has agreed to vote the shares
    of common stock subject to such arrangement at the direction of Mr. Reese.

(4) Mr. Ryan is a director of Iron Mountain. Mr. Ryan owns 2,306,674 shares
    directly. Also includes 2,148 shares that Mr. Ryan has the right to acquire
    pursuant to currently exercisable options not being offered under this
    prospectus. The remaining shares of common stock listed as being

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    beneficially owned by Mr. Ryan are held by Schooner Capital LLC. Mr. Ryan is
    the Chairman of the Board of Schooner Capital LLC and the principal
    shareholder, President and a Trustee of Schooner Capital Trust, the sole
    member of Schooner Capital LLC, and, accordingly, has sole voting and
    investment power with respect to the shares of common stock held by Schooner
    Capital LLC. Such shares are included in the maximum number of shares being
    offered under this prospectus by Schooner Capital LLC.

(5) Includes 874,249 shares of common stock as to which Schooner Capital LLC
    shares beneficial ownership with C. Richard Reese, a Director and Chairman
    of the Board and Chief Executive Officer of Iron Mountain, as a result of a
    1988 deferred compensation arrangement, as amended, between Schooner Capital
    LLC and Mr. Reese. See footnote 3.

    The selling shareholders are offering the shares described in this
prospectus. From time to time, depending upon the selling shareholders'
continuing review of their respective investments and various other facts, the
selling shareholders may, subject to any applicable securities laws, sell all or
any part of the shares offered by this prospectus. However, we have not filed
the registration statement of which this prospectus forms a part because of any
present intention of the selling shareholders to sell any of the offered shares.
Rather, we filed the registration statement to facilitate the pledge by the
selling shareholders of all or a part of the offered shares to one or more banks
or brokerage houses as collateral for loans to the selling shareholders. Because
we are registering the offered shares to facilitate the pledge of those shares
and because this offering is not being underwritten on a firm commitment basis,
we cannot give an estimate as to the number or percentage of shares that the
selling shareholders will own upon termination of this offering. More
information about the possible distribution of the offered shares is given in
"Plan of Distribution" below.

    Iron Mountain Records Management, Inc. ("IMRM"), one of our subsidiaries,
was the tenant under a lease dated January 1, 1991 for a 31,500 square-foot
building in Houston, Texas. The owner of the building was IM Houston (CR)
Limited Partnership, a Texas limited partnership, of which Mountain
Realty, Inc., a Massachusetts corporation whose sole stockholder is Mr. Ryan, is
the sole general partner, and the limited partners of which are Messrs. C.
Richard Reese, the Chairman of our Board of Directors and our Chief Executive
Officer, and Eugene B. Doggett, one of our directors. IMRM paid annual rent of
approximately $99,326 for the year ended December 31, 1998. As tenant, IMRM was
responsible for taxes, insurance and maintenance. Iron Mountain Statutory
Trust-1998 ("IMST"), a non-affiliated entity formed to acquire and lease records
storage properties to IMRM, purchased the property from IM Houston (CR) Limited
Partnership in January 1999 for a purchase price of approximately $930,000. The
purchase price was determined through an independent appraisal of the property.
IMRM leases the space from IMST and will continue to use the space as a records
and information management services facility. The prior lease and the
acquisition of the property by IMST were, in the opinion of our management, on
commercially reasonable terms and no less favorable to IMRM and IMST than could
have been obtained from an unaffiliated party at the time of the transactions.

    Schooner Capital LLC leases space from us at our corporate headquarters.
Such lease is a tenancy-at-will and may be terminated by either us or Schooner
at any time. As consideration for such lease, Schooner pays rent to us based on
its pro rata share of all expenses related to the use and occupancy of the
premises. The rent paid by Schooner to Old Iron Mountain under such lease was
approximately $93,930 in the year ended December 31, 1999, and Schooner
currently pays annual rent of approximately $98,182. We believe that the terms
of this lease are no less favorable to it than would have been negotiated with
an unrelated third party.

    In November 1997, we entered into a management advisory agreement with
Keystone Capital, Inc., of which Mr. Dauten, one of our directors, is president.
Keystone received fees of approximately $20,000 per month under such agreement
relating to consulting with respect to medical records

                                       9
<PAGE>
management services. We paid Keystone fees totaling $60,000 in 1998 for
consulting services through March 1998, after which time the agreement was
terminated. In addition, Keystone provided acquisition and divestiture
investment banking consulting services to us from May 1998 through
September 1998 in connection with the exchange of assets between one of our
subsidiaries and a third party. We paid Keystone a contingent fee of $92,000 in
October 1998 for such services. We believe that the terms of each of these
agreements were no less favorable to us than would have been negotiated with an
unrelated third party.

                              PLAN OF DISTRIBUTION

    We will not receive any proceeds from the sale of the offered shares.
Depending upon the selling shareholders' continuing review of their respective
investments and various other facts, the selling shareholders may, subject to
any applicable securities laws, sell all or any part of the offered shares.
However, we have not filed the registration statement of which this prospectus
forms a part because of any present intention of the selling shareholders to
sell any of the offered shares. Rather, the selling shareholders may pledge all
or a part of the offered shares held by them to one or more banks or brokerage
houses as collateral for loans to the selling shareholders. Prior to the merger
of Old Iron Mountain into us, the selling shareholders were permitted to pledge
shares of common stock of Old Iron Mountain to lenders who could sell their
collateral without registration under applicable securities laws. Due to the
merger of Old Iron Mountain with us, the exemptions from registration previously
available in connection with such pledges became unavailable. In order to permit
the selling shareholders to pledge the shares of our common stock that they
received as a result of the merger, we have agreed to file a registration
statement that would allow the selling shareholders to offer such shares under
this prospectus. In the event of a default under a loan to a selling shareholder
that is secured by the pledge of offered shares, the lender will have the right
to cause the sale of the offered shares under the registration statement of
which this prospectus forms a part.

    One or more selling shareholders, at the direction of a lender or otherwise,
or any lender may sell offered shares from time to time to purchasers directly.
Alternatively, one or more selling shareholders, at the direction of a lender or
otherwise, or any lender may from time to time offer the offered shares through
underwriters, dealers or agents who may receive compensation in the form of
underwriting discounts, concessions or commissions from the selling shareholders
and/or the purchasers of offered shares for whom they may act as agent. The
selling shareholders and any underwriters, dealers or agents who participate in
the distribution of the offered shares may be deemed to be underwriters, and any
profits on the sale of the offered shares by them and any discounts, commissions
or concessions received by any underwriters, dealers or agents might be deemed
to be underwriting discounts and commissions under the Securities Act of 1933,
as amended.

    To the extent the selling shareholders may be deemed to be underwriters, the
selling shareholders may be subject to certain statutory liabilities of the
Securities Act of 1933, as amended, including but not limited to, Sections 11,
12 and 17 of that Act and Rule 10b-5 under the Securities Exchange Act of 1934,
as amended. At any time a selling shareholder or underwriter makes a particular
offer of the offered shares under this prospectus, if required, the selling
shareholder or underwriter will distribute a prospectus supplement that will
identify the aggregate amount of the shares being offered and the terms of the
offering, including the name or names of any underwriters, dealers or agents,
any discounts, commissions and other items constituting compensation from the
selling shareholders and any discounts, commissions or concessions allowed or
reallowed or paid to dealers. We will file the prospectus supplement and, if
necessary, a post-effective amendment to the registration statement of which
this prospectus is a part with the SEC to reflect the disclosure of additional
information with respect to the distribution of the offered shares.

    The offered shares may be sold from time to time in one or more transactions
at a fixed offering price, which may be changed, or at varying prices determined
at the time of sale or at negotiated

                                       10
<PAGE>
prices. The offered shares may be sold in transactions in which this prospectus
is delivered or, for selling shareholders who are not underwriters and who are
not affiliates of us, in which this prospectus is not delivered. The selling
shareholders will determine those prices, or those prices will be determined by
agreement between the selling shareholders and underwriters or dealers.

    The selling shareholders and any other person participating in a
distribution may be subject to applicable provisions of the Exchange Act and the
rules and regulations thereunder, including without limitation Rule 10b-3 and
Regulation M, which provisions may limit the timing or purchases and sales of
any of the offered shares by the selling shareholders and any other such person.
Furthermore, under Regulation M under the Exchange Act, to the extent
applicable, any person engaged in a distribution of the offered shares may not
simultaneously engage in market making activities with respect to the particular
offered shares being distributed for a period of nine business days prior to the
commencement of the distribution. All of the foregoing may affect the
marketability of the offered shares and the ability of any person or entity to
engage in market making activities with respect to the offered shares.

                                 LEGAL MATTERS

    Cozen and O'Connor, Philadelphia, Pennsylvania, counsel to us prior to our
merger with Old Iron Mountain, has rendered its opinion that the shares of
common stock offered hereby are legally issued, fully paid and non-assessable.
Two members of Cozen and O'Connor are limited partners in certain limited
partnerships that lease facilities to Iron Mountain.

                                    EXPERTS

    The consolidated financial statements and schedule of Old Iron Mountain and
its subsidiaries for the three years ended December 31, 1998, included in Old
Iron Mountain's Current Report on Form 8-K dated July 9, 1999, and its
supplemental schedule, Valuation and Qualifying Accounts, included in its Annual
Report on Form 10-K dated March 31, 1999, have been audited by Arthur Andersen
LLP, independent public accountants, as indicated in their reports with respect
thereto, and are included or incorporated by reference herein in reliance upon
the authority of said firm as experts in giving said reports.

    The consolidated financial statements and schedule of Iron Mountain
Incorporated (f/k/a Pierce Leahy Corp.) and its subsidiaries for the three years
ended December 31, 1998, included in its Annual Report on Form 10-K for the year
ended December 31, 1998, have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their reports with respect thereto, and are
included or incorporated by reference herein in reliance upon the authority of
said firm as experts in giving said reports.

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

                                       11
<PAGE>
    The consolidated financial statements of Arcus Technology Services, Inc. for
each of the two years in the period ended December 31, 1997 and the five-month
period ended December 31, 1995 and the consolidated financial statements of
Arcus, Inc. (Predecessor Company) for the seven-month period ended July 31,
1995, appearing in Old Iron Mountain's Current Report on Form 8-K dated
March 9, 1998, have been audited by Ernst & Young LLP, independent auditors, as
indicated in their report thereon included therein, and are incorporated by
reference herein in reliance upon such report given upon the authority of said
firm as experts in accounting and auditing.

    The consolidated financial statements of Arcus Group, Inc. for each of the
two years in the period ended December 31, 1996, appearing in Old 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 indicated
in their reports thereon included therein, and are incorporated by reference
herein in reliance upon such reports given upon the authority of said firm as
experts in accounting and auditing.

    The financial statements of Midwest Records Management for the year ended
December 31, 1997, included in Old Iron Mountain's Current Report on Form 8-K
dated September 18, 1998, have been audited by Arthur Andersen LLP, independent
public accountants, as indicated 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 Sloan Vaults, Inc. and Affiliate for the year
ended December 31, 1997, included in Old Iron Mountain's Current Report on
Form 8-K dated September 18, 1998, have been audited by Arthur Andersen LLP,
independent public accountants, as indicated 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 InterMation, Inc. for the year ended
December 31, 1997, included in Old Iron Mountain's Current Report on Form 8-K
dated September 18, 1998, have been audited by Arthur Andersen LLP, independent
public accountants, as indicated 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 National Underground Storage, Inc. for the two
years ended December 31, 1997, included in Old Iron Mountain's Current Report on
Form 8-K/A dated August 7, 1998, have been audited by Carbis Walker &
Associates, LLP, independent public accountants, as indicated 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 Britannia Data Management Limited for the two
years ended October 31, 1998, included in Old Iron Mountain's Current Report on
Form 8-K/A dated March 22, 1999, have been audited by RSM Robson Rhodes,
chartered accountants, as indicated 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 Base, Inc. and Affiliate for the three
years ended December 31, 1998, included in Old Iron Mountain's Current Report on
Form 8-K dated April 16, 1999, have been audited by Moss Adams LLP, independent
public accountants, as indicated 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 First American Records Management for the two
years ended December 31, 1998, included in Old Iron Mountain's Current Report on
Form 8-K dated July 9, 1999, have been audited by Brach, Neal, Daney & Spence,
LLP, independent public accountants, as indicated

                                       12
<PAGE>
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 MAP, S.A. for the year ended February 28, 1999,
included in Old Iron Mountain's Current Report on Form 8-K dated July 9, 1999,
have been audited by Barbier Frinault & Associes, independent public
accountants, as indicated 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 Central File, Inc. for the year ended
December 31, 1998, included in Old Iron Mountain's Current Report on Form 8-K
dated November 23, 1999, have been audited by Fernandez & Bravo, independent
public accountants, as indicated 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 combined audited financial statements of Sistemas de Archivo, S.A. de
C.V. and Sistemas de Archivo Mexico, S.A. de C.V. (collectively Sistemas de
Archivo) for the year ended December 31, 1998, included in Old Iron Mountain's
Current Report on Form 8-K dated November 23, 1999, have been audited by Ruiz,
Urquiza, y Cia, S.C., independent public accountants, as indicated 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 Stortext (Holdings) Limited Group for the year
ended March 31, 1999, included in Old Iron Mountain's Current Report on
Form 8-K dated November 23, 1999, have been audited by Arthur Andersen,
independent public accountants, as indicated 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 Midtown Professional Records Centre, Inc. for
the year ended December 31, 1998, included in Old Iron Mountain's Current Report
on Form 8-K dated November 23, 1999, have been audited by Arthur Andersen LLP,
independent public accountants, as indicated 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 Archivex Inc. as of November 30, 1996 and 1997,
and for the years then ended, included in Iron Mountain Incorporated's (f/k/a
Pierce Leahy Corp.) Current Report on Form 8-K dated July 2, 1998, have been
audited by Friedman & Friedman, Chartered Accountants, independent auditors, as
stated in their report with respect thereto, and are incorporated by reference
herein in reliance upon the report of such firm given upon their authority as
experts in giving said reports.

    The financial statements of Kestrel Holdings, Inc. as of September 30, 1997,
and for the year then ended, included in Iron Mountain Incorporated's (f/k/a
Pierce Leahy Corp.) Current Report on Form 8-K dated July 2, 1998, have been
audited by James N. Howard & Associates, P.C., independent auditors, as stated
in their report with respect thereto, and are incorporated by reference herein
in reliance upon the report of such firm given upon their authority as experts
in giving said reports.

                                       13
<PAGE>
                             ABOUT THIS PROSPECTUS

    This prospectus is part of a post-effective amendment on Form S-3 to our
registration statement on Form S-4 that we have filed with the Securities and
Exchange Commission. This prospectus does not contain all of the information
that you will find in the registration statement. Statements in this prospectus
about the contents of any contract or other document are not necessarily
complete. In addition to reading this prospectus, you should read the copies of
the contracts and other documents that we have filed as exhibits to the
registration statement. The statements we make in this prospectus are qualified
in all respects by the information contained in the exhibits to the registration
statement. The section called "Where You Can Find More Information" below
contains information about how you can obtain copies of the registration
statement and additional information about us.

    You should rely only on the information contained or incorporated by
reference in this prospectus. We have not, and the selling shareholders have
not, authorized any other person to provide you with different information. If
anyone provides you with different or inconsistent information, you should not
rely on it. We are not, and the selling shareholders are not, making an offer to
sell these securities in any jurisdiction where the offer or sale is not
permitted. You should assume that the information appearing in this prospectus,
as well as the information we have previously filed with the SEC and
incorporated by reference, is accurate only as of the date on the front cover of
this prospectus. Our business, financial condition, results of operations and
prospects may have changed since that date.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and current reports, proxy statements and other
information with the SEC. You may read and copy any reports, statements or other
information filed by Old Iron Mountain and filed or to be filed by Iron Mountain
Incorporated (f/k/a Pierce Leahy Corp.) at the SEC's public reference rooms in
Washington, D.C., New York, New York and Chicago, Illinois. Please call the SEC
at 1-800-SEC-0330 for further information on the public reference rooms. You may
access the filings of Iron Mountain Incorporated (f/k/a Pierce Leahy Corp.) and
Old Iron Mountain on the SEC's website at http://www.sec.gov.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to another document filed separately with the SEC. The information
incorporated by reference is considered to be part of this prospectus, except
for any information superseded by information included in, or incorporated by
reference in, this prospectus. This prospectus incorporates by reference the
documents listed below filed with the SEC. These documents contain important
information about our companies and their finances.

    The following documents filed by us (File No. 1-13045) are incorporated into
this prospectus by reference (unless noted, they were filed under the name
"Pierce Leahy Corp."):

    - Annual Report on Form 10-K for the fiscal year ended December 31, 1998.

    - Quarterly Reports on Form 10-Q for the quarters ended March 31, June 30
      and September 30, 1999.

    - Current Reports on Form 8-K filed October 22, 1999 and February 1, 2000
      (filed under the name "Iron Mountain Incorporated").

    - The financial information contained in the Current Report on Form 8-K
      filed July 2, 1998.

                                       14
<PAGE>
    - The description of the common stock contained in the Registration
      Statement on Form 8-A dated May 27, 1997, including all amendments and
      reports filed for the purpose of updating such description.

    The following documents filed by Old Iron Mountain (File No. 0-27584 for
documents filed through August 13, 1999 and File No. 1-14937 for all documents
filed thereafter) are incorporated into this prospectus by reference:

    - Annual Report on Form 10-K for the fiscal year ended December 31, 1998.

    - Quarterly Reports on Form 10-Q for the quarters ended March 31, June 30
      and September 30, 1999.

    - Current Reports on Form 8-K filed January 19 (amended by Current Report on
      Form 8-K/A filed March 22), March 3, April 16, April 22, May 7, May 11,
      July 9, July 29, October 21 and November 23, 1999.

    - The financial information contained in Current Reports on Form 8-K filed
      October 30, 1997, November 25, 1997, March 9, 1998, July 10, 1998 (amended
      by Current Report on Form 8-K/A filed August 7, 1998) and September 18,
      1998.

We also incorporate by reference each of the following documents that we will
file with the SEC after the date of this prospectus but before the end of the
offering of the offered shares:

    - Reports filed under Sections 13(a) and (c) of the Securities Exchange Act
      of 1934;

    - Definitive proxy or information statements filed under Section 14 of the
      Securities Exchange Act of 1934 in connection with any subsequent
      shareholders' meeting; and

    - Any reports filed under Section 15(d) of the Securities Exchange Act of
      1934.

    We also incorporate by reference each of the reports and statements
described in the preceding paragraph which we will file with the SEC after the
date of post-effective amendment no. 1 to the registration statement of which
this prospectus is a part but before the effectiveness of that post-effective
amendment no. 1 to the registration statement.

    Documents incorporated by reference are available from the SEC, or from us
without charge, excluding exhibits, unless we have specifically incorporated by
reference an exhibit in this prospectus.

    You may obtain documents incorporated by reference in this prospectus by
requesting them in writing or by telephone from us at the following address and
telephone number:

                               John F. Kenny, Jr.
                          Executive Vice President and
                            Chief Financial Officer
                           Iron Mountain Incorporated
                              745 Atlantic Avenue
                          Boston, Massachusetts 02111
                                 (617) 535-4766

                                       15
<PAGE>
                           FORWARD LOOKING STATEMENTS

    We have made statements in this prospectus or in other documents
incorporated by reference that constitute "forward-looking statements" as that
term is defined in the federal securities laws. Such forward-looking statements
concern the operations, economic performance and financial condition of Iron
Mountain. The forward-looking statements are subject to various known and
unknown risks, uncertainties and other factors. When we use words such as
"believes," "expects," "anticipates," "estimates" or similar expressions, we are
making forward-looking statements.

    Although we believe that our forward-looking statements are based on
reasonable assumptions, our expected results may not be achieved and actual
results may differ materially from our expectations. Important factors that
could cause actual results to differ from expectations include, among others,
the following:

    - difficulties related to the integration of acquisitions generally and,
      more specifically, the integration of the operations of Old Iron Mountain
      and us;

    - our significant indebtedness and the cost and availability of financing
      for contemplated growth;

    - the cost and availability of appropriate storage facilities;

    - changes in customer preferences and demand for our services;

    - rapid and significant changes in technology;

    - intense competition in the industry; and

    - other general economic and business conditions.

    Certain of these and other factors are described more fully or set forth
under "Risk Factors" in this prospectus. These cautionary statements should not
be construed by you to be exhaustive, and they are made only as of the date of
this prospectus or, in the case of documents incorporated by reference, the date
of such documents. You should read these cautionary statements as being
applicable to all forward-looking statements wherever they appear. We assume no
obligation to update or revise the forward-looking statements or to update the
reasons why actual results could differ from those projected in the
forward-looking statements.

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