UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
(Amendment No. 3)
Under the Securities Exchange Act of 1934
Information to be included in statements filed pursuant to
Rules 13d-1(b), (c) and (d) and amendments thereto filed
pursuant to 13d-2.
IRON MOUNTAIN INCORPORATED
____________
(Name of Issuer)
Common Stock, par value $0.01 per share
_______________________________________
(Title of Class Securities)
46284P 10 4
___________
(CUSIP Number)
December 31, 1999
CUSIP NO.46284P 10 4 SCHEDULE 13G
___________
1) Names of Reporting Persons
B. Thomas Golisano
2) Check the Appropriate Box if a Member of a Group (See Instructions)
(a) [ ]
(b) [ ]
3) SEC Use Only _________________________________________________________
__________________________________________________________________________
4) Citizenship or Place of Organization: United States of America
Number of Shares 5) Sole Voting Power 1,522,788
Beneficially 6) Shared Voting Power -0-
Owned by Each 7) Sole Dispositive Power 1,522,788
Reporting Person 8) Shared Dispositive Power -0-
Includes 7,575 shares that Mr. Golisano has the right to acquire pursuant to
currently exercisable options or options becoming exercisable within 60 days.
Does not include 1,535 shares subject to options not yet exercisable.
9) Aggregate Amount Beneficially Owned by Each Reporting Person 1,522,788
10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares
(See Instructions): [ ]
11) Percent of Class Represented by Amount in Row 9 4.3%
(1,522,788 / 35,471,310 at 12/31/99)
12) Type of Reporting Person (See Instructions): IN
Item 1. (a) Name of Issuer:
______________
Iron Mountain Incorporated
(b) Address of Issuer's Principal Executive Offices:
_______________________________________________
745 Atlantic Avenue
Boston, Massachusetts 02111
Item 2. (a) Name of Person Filing:
_____________________
B. Thomas Golisano
(b) Address of Principal Business Office:
____________________________________
c/o Paychex, Inc.
911 Panorama Trail South
Rochester, NY 14625
(c) Citizenship:
___________
United States of America
(d) Title of Class of Securities:
____________________________
Common Stock, par value $0.01 per share
(e) CUSIP Number:
____________
46284P 10 4
Item 3. Not Applicable
Item 4. Ownership
_________
(a) Amount beneficially owned: 1,522,788
(b) Percent of Class: 4.3%
(c) (i) sole power to vote or to
direct the vote: 1,522,788
(ii) shared power to vote or to
direct the vote: -0-
(iii) sole power to dispose or to direct
the disposition of: 1,522,788
(iv) shared power to dispose or to direct
the disposition of: -0-
Item 5. Ownership Five Percent or Less of a Class: [X]
_________________________________________
This statement is being filed to report the fact that as of
the date hereof the reporting person has ceased to be the
beneficial owner of more than five percent of the class of
securities.
Item 6. Ownership of more than Five Percent on Behalf of Another Person:
_______________________________________________________________
N/A
Item 7. Identification and Classification of the Subsidiary Which Acquired
and Security Being Reported by the Parent Holding Company
__________________________________________________________________
N/A
Item 8. Identification and Classification of Members of the Group
_________________________________________________________
N/A
Item 9. Notice of Dissolution of Group
______________________________
N/A
Item 10. Certification
_____________
By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are
not held for the purpose of or with 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 purpose 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.
Dated: February 4, 2000
/s/ B. THOMAS GOLISANO
_________________________
B. Thomas Golisano
Director of Issuer
