Page 1 of 12 Pages
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
IRON MOUNTAIN, INC.
-----------------------------------------------------
(Name of Issuer)
COMMON
-----------------------------------------------------
(Title of Class of Securities)
46284P104
-----------------------------------------------------
(CUSIP Number)
Check the following box if a fee is being paid with this statement [ ].
(A fee is not required only if the filing person: (1) has a previous statement
on file reporting beneficial ownership of more than five percent of the class
of securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
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Page 2 of 12 Pages
Amendment Number 1 to Schedule 13G (continued)
CUSIP No. 46284P104
- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Baron Capital Group, Inc.
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3 SEC USE ONLY
- --------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
New York
- --------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 793,250
REPORTING --------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
--------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
793,250
- --------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
793,250
- --------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
- --------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
HC, CO
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
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Page 3 of 12 Pages
Amendment Number 1 to Schedule 13G (continued)
CUSIP No. 46284P104
- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
BAMCO, Inc.
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3 SEC USE ONLY
- --------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
New York
- --------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 772,500
REPORTING --------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
--------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
772,500
- --------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
772,500
- --------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
- --------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
IA, CO
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
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Page 4 of 12 Pages
Amendment Number 1 to Schedule 13G (continued)
CUSIP No. 46284P104
- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Baron Capital Management, Inc.
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3 SEC USE ONLY
- --------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
New York
- --------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 20,750
REPORTING --------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
--------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
20,750
- --------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
20,750
- --------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
0.06%
- --------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
IA, CO
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
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Page 5 of 12 Pages
Amendment Number 1 to Schedule 13G (continued)
CUSIP No. 46284P104
- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Baron Small Cap Fund
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3 SEC USE ONLY
- --------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
USA
- --------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 712,500
REPORTING --------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
--------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
712,500
- --------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
712,500
- --------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.0%
- --------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
HC, IN
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
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Page 6 of 12 Pages
Amendment Number 1 to Schedule 13G (continued)
CUSIP No. 46284P104
- --------------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Ronald Baron
- --------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3 SEC USE ONLY
- --------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
USA
- --------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 793,250
REPORTING --------------------------------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH
--------------------------------------------------------------
8 SHARED DISPOSITIVE POWER
793,250
- --------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
793,250
- --------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
- --------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
HC, IN
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
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Page 7 of 12 Pages
Item 1.
(a) Name of Issuer:
Iron Mountain, Inc.
(b) Address of Issuer's Principal Executive Offices:
745 Atlantic Avenue
Boston, MA 02111
Item 2.
(a) Name of Persons Filing:
Baron Capital Group, Inc. ("BCG")
BAMCO, Inc. ("BAMCO")
Baron Capital Management, Inc. ("BCM")
Baron Small Cap Fund ("BSC")
Ronald Baron
(b) Address of Principal Business Office:
767 Fifth Avenue
New York, NY 10153
(c) Citizenship:
BCG, BAMCO and BCM are New York corporations.
BSC is a series of a Massachusetts business trust and
Ronald Baron is a citizen of the United States.
(d) Title of Class Securities:
Common
(e) CUSIP Number:
46284P104
Item 3. PERSONS FILING:
BCG and Ronald Baron are:
(g) Parent holding companies, in accordance with
Section 240.13d-1(b)(ii)(G)
BAMCO and BCM are:
(e) Investment Advisers registered under Section 203 of
the Investment Advisers Act of 1940
BSC is:
(d) Investment Company registered under Section 8 of the
Investment Company Act
All persons filing are:
(h) Group, in accordance with Rule 13d-1(b)(1)(ii)(F)
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Page 8 of 12 Pages
Item 4. OWNERSHIP^
(a) Amount Beneficially Owned as of December 31, 1999:
BCG: 793,250 shares
BAMCO: 772,500 shares
BCM: 20,750 shares
BSC: 712,500 shares
Ronald Baron: 793,250 shares
(b) Percent of Class:
BCG: 2.2%
BAMCO: 2.2%
BCM: 0.06%
BSC: 2.0%
Ronald Baron: 2.2%
^BCG and Ronald Baron disclaim beneficial ownership of
shares held by their controlled entities (or the investment
advisory clients thereof) to the extent such shares are held
by persons other than BCG and Ronald Baron. BAMCO and
BCM disclaim beneficial ownership of shares held by their
investment advisory clients to the extent such shares are held
by persons other than BAMCO, BCM and their affiliates.
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Page 9 of 12 Pages
(c) Number of shares as to which such person has:
(i) sole power to vote or direct the vote:
BCG: 0
BAMCO: 0
BCM: 0
BSC: 0
Ronald Baron: 0
(ii) shared power to vote or direct the vote:
BCG: 793,250
BAMCO: 772,500
BCM: 20,750
BSC: 712,500
Ronald Baron: 793,250
(iii) sole power to dispose or to direct
the disposition of:*
BCG: 0
BAMCO: 0
BCM: 0
BSC: 0
Ronald Baron: 0
(iv) shared power to dispose or direct
the disposition of:*
BCG: 793,250
BAMCO: 772,500
BCM: 20,750
BSC: 712,500
Ronald Baron: 793,250
Item 5. OWNERSHIP OF 5% OR LESS OF A CLASS
Filing Persons have ceased being the beneficial owners of more
than 5% of the class of securities reported herein.
Item 6. OWNERSHIP OF MORE THAN 5% ON BEHALF OF ANOTHER PERSON
Not applicable.
Item 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
HOLDING COMPANY
BAMCO and BCM are subsidiaries of BCG. BSC is a series of a
Massachusetts business trust which is an advisory client of
BAMCO. Ronald Baron owns a controlling interest in BCG.
Item 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
See Item 3.
* By virtue of investment advisory agreements with their respective
clients, BAMCO and BCM have been given the discretion to dispose
or the disposition of the securities in the advisory accounts.
All such discretionary agreements, are however, revocable.
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Page 10 of 12 Pages
Item 9. NOTICE OF DISSOLUTION OF GROUP
Not applicable.
Item 10. Certification
By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the purpose
of and do not have the effect of changing or influencing the control
of the issuer of such securities and were not acquired in connection
with or as a participant in any transaction having such purposes or
effect.
Signature
After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true,
complete and correct.
Date: February 11, 2000
Baron Capital Group, Inc.,
BAMCO, Inc., Baron Small Cap Fund and
Baron Capital Management, Inc.
By:
/s/ Ronald Baron
_______________________________________
Ronald Baron, Chairman and CEO
Ronald Baron, Individually
By:
/s/ Ronald Baron
_______________________________________
Ronald Baron
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Page 11 of 12 Pages
Joint Filing Agreement
The undersigned each hereby agree that the Schedule 13G dated
February 11, 2000, which relates to the common stock of Iron Mountain, Inc.,
is to be filed jointly on behalf of each of them for the reasons stated
therein, and any amendments thereto shall be filed jointly by the undersigned.
Dated: February 11, 2000
Baron Capital Group, Inc.,
BAMCO, Inc., Baron Small Cap Fund
and Baron Capital Management, Inc.
By:
/s/ Ronald Baron
_______________________________________
Ronald Baron, Chairman and CEO
Ronald Baron, Individually
By:
/s/ Ronald Baron
_______________________________________
Ronald Baron
