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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	2012-09-21	4,157	$24.72	12,184	No	4	M	Direct
Common Shares, No Par Value	Disposition	2012-09-21	4,157	$35.72	8,027	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	2012-09-21	4,157	$0.00	4,157	$24.72

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		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 4,157 Common Shares is pursuant to a Rule 10b5-1 Stock Trading Plan entered into by the Reporting Person on August 3, 2012.
5,280 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 2,680 on May 20, 2014, 500 on May 31, 2013, 500 on June 2, 2014, 500 on June 1, 2015, 275 on May 30, 2013, 275 on May 30, 2014, 275 on June 1, 2015 and 275 on May 31, 2016.
Represents an investment by Mr. Aamoth in his Vanguard William L. Aamoth - Rollover IRA Brokerage Account.
Represents 648.113 units of the STERIS Corporation 401(k) Plan STERIS Stock Fund which equals 635 Common share equivalents as of September 21, 2012.
These options became exercisable as follows: 1,007 on September 12, 2007, 1,050 on September 12, 2008 1,050 on September 12, 2009 and 1,050 on September 12, 2010.