Annual report
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , DC 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE + ACT OF 1934 ☐ For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period to Maryland Commission File Number : 001-35789 CyrusOne Inc. ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) Title of Each Class 2850 N. Harwood Street , Suite 2200 , Dallas , TX 75201 ( Address of Principal Executive Offices ) ( Zip Code ) ( 972 ) 350-0060 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Common Stock , $ .01 par value 1.450 % Senior Notes due 2027 Trading Symbol CONE CONE27 46-0691837 ( I.R.S. Employer Identification No. ) Name of Each Exchange on Which Registered The NASDAQ Global Select Market The Nasdaq Stock Market LLC Securities registered pursuant to Section 12 ( g ) of the Act : None . Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes ý No " Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . No ý Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ý No " Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ý No "