<SEC-DOCUMENT>0001104659-21-048066-index.html : 20210408
<SEC-HEADER>0001104659-21-048066.hdr.sgml : 20210408
<ACCEPTANCE-DATETIME>20210408162005
ACCESSION NUMBER:		0001104659-21-048066
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20210408
DATE AS OF CHANGE:		20210408

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:		21815138

	BUSINESS ADDRESS:	
		STREET 1:		2850 N HARWOOD ST
		STREET 2:		SUITE 2200
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		(972) 350-0060

	MAIL ADDRESS:	
		STREET 1:		2850 N HARWOOD ST
		STREET 2:		SUITE 2200
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>tm212293d3_defa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: tm212293d3_defa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>tm212293d3_def14aimg01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: tm212293d3_def14aimg01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>tm212293d3_def14aimg02.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: tm212293d3_def14aimg02.jpg

</DOCUMENT>
</SEC-DOCUMENT>