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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1014507	Sirona Dental Systems Inc.	SIRO	Dental Equipment & Supplies (3843)	113374812

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1246224	W Nicholas Alexos	C/O Madison Dearborn Partners, Llc Three First National Plaza,Suite 4600 Chicago IL 60602		Yes	No	No	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	Disposition	2011-03-16	4,500,000	$48.50	9,747,480	No	4	S	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnotes

Footnotes

Owned by Sirona Holdings Luxco S.C.A. ("Luxco").
The following entities may be deemed to have a beneficial interest in the Common Stock held by Luxco: Sirona Holdings S.A. ("Luxco Manager"), by virtue of its being the sole manager of Luxco; MDCP Global Aggregator, L.P. ("MDCP Global Aggregator") by virtue of its being the controlling shareholder of Luxco, MDCP IV Global Investments LP by virtue of its being the controlling shareholder of Sirona Holdings S.A., MDP IV Global GP, LP by virtue of its being the sole general partner of MDCP IV Global Investments LP and MDP Global Investors Limited by virtue of its being the sole general partner of MDP IV Global GP, LP and MDCP Global Aggregator. (Continued in Footnote 3)
A majority of the following members of MDP Global Investors Limited have the authority to vote or dispose of the shares: John A. Canning, Jr., Paul J. Finnegan, Samuel M. Mencoff, Paul R. Wood, Justin S. Huscher, James N. Perry, Jr., Thomas R. Reusche, Cynthia Reusche, Timothy P. Sullivan, Nicholas W. Alexos, Robin P. Selati, Gary J. Little GST Exempt Marital Trust, David F. Mosher and Thomas Souleles. Each of the members of MDP Global Investors Limited and each of MDCP Global Aggregator, MDCP IV Global Investments LP, MDP IV Global GP, LP and MDP Global Investors Limited disclaims beneficial ownership of any shares directly held by Luxco except to the extent of their respective pecuniary interests therein.