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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1553023	Cyrusone Inc.	CONE	Real Estate Investment Trusts (6798)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1502801	Marcato, L.p.	One Montgomery Street Suite 3250 San Francisco CA 94104	No	No	Yes	No
1502803	Marcato International Master Fund, Ltd.	C/O Ogier Fiduciary Services (Cayman)Ltd 89 Nexus Way, Camana Bay Grand Cayman E9 KY1-9007	No	No	Yes	No
1502825	Marcato Ii, L.p.	One Montgomery Street Suite 3250 San Francisco CA 94104	No	No	Yes	No
1541996	Marcato Capital Management Llc	One Montgomery Street Suite 3250 San Francisco CA 94104	No	No	Yes	No
1558320	Richard Mcguire	One Montgomery Street Suite 3250 San Francisco CA 94104	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, $0.01 Par Value Per Share	Acquisiton	2013-02-28	167,066	$21.25	2,502,292	No	4	P	Indirect	See Footnote
Common Stock, $0.01 Par Value Per Share	Acquisiton	2013-03-01	56,000	$21.35	2,558,292	No	4	P	Indirect	See Footnote
Common Stock, $0.01 Par Value Per Share	Acquisiton	2013-03-04	6,600	$22.02	2,564,892	No	4	P	Indirect	See Footnote
Common Stock, $0.01 Par Value Per Share	Acquisiton	2013-03-05	25,002	$22.79	2,589,894	No	4	P	Indirect	See Footnote
Common Stock, $0.01 Par Value Per Share	Acquisiton	2013-03-12	2,500	$22.02	2,592,394	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Footnotes

The securities are held in the account of Marcato International Master Fund, Ltd., Marcato, L.P. and Marcato II, L.P. (collectively, the "Funds") and may be deemed to be beneficially owned by (i) Marcato Capital Management LLC, the investment manager or general partner, as applicable, of the Funds, and (ii) Richard McGuire III, the managing member of Marcato Capital Management LLC. Each of Marcato Capital Management LLC and Richard McGuire III disclaims beneficial ownership of these reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that any such person is the beneficial owner of these securities for purposes of Section 16 of the U.S. Securities Exchange Act of 1934, as amended, or for any other purpose.