<SEC-DOCUMENT>0001104659-18-028541-index.html : 20180430
<SEC-HEADER>0001104659-18-028541.hdr.sgml : 20180430
<ACCEPTANCE-DATETIME>20180430161516
ACCESSION NUMBER:		0001104659-18-028541
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20180430
DATE AS OF CHANGE:		20180430
EFFECTIVENESS DATE:		20180430

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IRON MOUNTAIN INC
		CENTRAL INDEX KEY:			0001020569
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				232588479
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13045
		FILM NUMBER:		18789920

	BUSINESS ADDRESS:	
		STREET 1:		ONE FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		617-535-4781

	MAIL ADDRESS:	
		STREET 1:		ONE FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IRON MOUNTAIN INC/PA
		DATE OF NAME CHANGE:	20000201

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PIERCE LEAHY CORP
		DATE OF NAME CHANGE:	19960807
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>a18-2903_3defa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: a18-2903_3defa14a.htm

</DOCUMENT>
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<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g29033bgi001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g29033bgi001.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g29033bgi002.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g29033bgi002.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g29033bgi003.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g29033bgi003.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g29033bgi004.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g29033bgi004.gif

</DOCUMENT>
</SEC-DOCUMENT>