Sec Form 4 Filing - Timmons Kevin L @ CyrusOne Inc. - 2016-02-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Timmons Kevin L 2. Issuer Name and Ticker or Trading Symbol CyrusOne Inc. [ CONE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CHIEF TECHNOLOGY OFFICER (Last) (First) (Middle) C/O CYRUSONE INC., 1649 WEST FRANKFORD ROAD 3. Date of Earliest Transaction (MM/DD/YY) 02/01/2016 (Street) CARROLLTON, TX75007 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock ( 1 ) 02/01/2016 A 46,133 A $ 0 239,058 D Common Stock ( 2 ) 02/01/2016 A 4,125 A $ 0 243,183 D Common Stock ( 3 ) 02/01/2016 A 24,314 A $ 0 267,497 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option $ 36.99 02/01/2016 A 28,612 ( 4 ) 02/01/2026 Common Stock 28,612 $ 0 28,612 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Timmons Kevin L C/O CYRUSONE INC. 1649 WEST FRANKFORD ROAD CARROLLTON, TX75007 CHIEF TECHNOLOGY OFFICER Signatures /s/ Robert M. Jackson, Attorney-in-Fact 02/03/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of restricted stock granted to Mr. Timmons which vest on the third anniversary of the year of the grant pursuant to the CyrusOne 2012 Long Term Incentive Plan. ( 2 )Represents shares of time-based restricted stock granted pursuant to the CyrusOne 2012 Long Term Incentive Plan. The shares under the award shall initially be subject to transfer and forfeiture restrictions set forth in the award agreement, and the number of such shares will become free of such restrictions in cumulative installments on February 1, 2017, February 1, 2018 and February 1, 2019. Shares that do not become free of the transfer and forfeiture restrictions pursuant to the terms of the award agreement will be forfeited back to CyrusOne Inc. ( 3 )Represents shares of performance-based restricted stock granted pursuant to the CyrusOne 2012 Long Term Incentive Plan. The amount reported represents the maximum number of shares that can vest under the award. The target number of shares that can vest under the award is fifty percent (50%) of the maximum number of shares. The shares under the award shall initially be subject to transfer and forfeiture restrictions and, subject in each case to the applicable performance criteria set forth in the award agreement, (i) up to 33% and 66% of the target number of such shares will become free of such restrictions in cumulative installments on February 28, 2017 and February 28, 2018 respectively, and (ii) up to the maximum number of such shares that have not previously vested will become free of such restrictions on February 28, 2019. Shares that do not become free of the transfer and forfeiture restrictions pursuant to the terms of the award agreement will be forfeited back to CyrusOne Inc. ( 4 )Represents stock options granted pursuant to the CyrusOne 2012 Long Term Incentive Plan. The stock options shall vest and become exercisable in approximately equal installments on each of February 1, 2017, February 1, 2018 and February 1, 2019.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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