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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
815065	Steris Corp	STE	Orthopedic, Prosthetic & Surgical Appliances & Supplies (3842)	341482024

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1236375	L William Aamoth	5960 Heisley Road Mentor OH 44060	V P - Corporate Treasurer	No	Yes	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 Shares, No Par Value	Acquisiton	2010-12-17	43	$24.72	8,995	No	4	M	Direct
Common Shares, No Par Value	Disposition	2010-12-17	43	$38.00	8,952	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Shares, No Par Value	Employee Stock Option Exercise	Disposition	2010-12-17	43	$0.00	43	$24.72

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
4,157	2007-09-12	2016-09-12	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, No Par Value	500	Indirect	See Footnote Below.
Common Shares, No Par Value	635	Indirect	See Footnote Below.

Footnotes

These open market sales of a total of 43 Common Shares is pursuant to a Rule 10b5-1 Stock Trading Plan entered into by the Reporting Person on May 10, 2010.
6,280 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 1,600 on May 23, 2011, 2,000 on May 21, 2012 and 2,680 on May 20, 2014.
Represents an investment by Mr. Aamoth in his Vanguard William L. Aamoth - Rollover IRA Brokerage Account.
Represents 648.646 units of the STERIS Corporation 401(k) Plan STERIS Stock Fund which equals 635 share equivalents as of December 17, 2010.