<SEC-DOCUMENT>0001104659-17-017617-index.html : 20170317
<SEC-HEADER>0001104659-17-017617.hdr.sgml : 20170317
<ACCEPTANCE-DATETIME>20170317162137
ACCESSION NUMBER:		0001104659-17-017617
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170317
DATE AS OF CHANGE:		20170317
EFFECTIVENESS DATE:		20170317

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CyrusOne Inc.
		CENTRAL INDEX KEY:			0001553023
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35789
		FILM NUMBER:		17698317

	BUSINESS ADDRESS:	
		STREET 1:		2101 CEDAR SPRINGS ROAD
		STREET 2:		SUITE 900
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		(972) 350-0060

	MAIL ADDRESS:	
		STREET 1:		2101 CEDAR SPRINGS ROAD
		STREET 2:		SUITE 900
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>a17-2249_3defa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: a17-2249_3defa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g22493bci001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g22493bci001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g22493bci002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g22493bci002.jpg

</DOCUMENT>
</SEC-DOCUMENT>