Sec Form 4 Filing - WAREHAM JOHN P @ STERIS CORP - 2012-08-03

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 WAREHAM JOHN P 2. Issuer Name and Ticker or Trading Symbol STERIS CORP [ STE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 5960 HEISLEY ROAD 3. Date of Earliest Transaction (MM/DD/YY) 08/03/2012 (Street) MENTOR, OH44060 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 Shares, No Par Value 08/03/2012 A 1,854 A $ 0 20,256 ( 1 ) D Common Shares, No Par Value 08/06/2012 M 10,000 A $ 20.89 30,256 D Common Shares, No Par Value 08/06/2012 S 7,000 D $ 32.9283 23,256 D Common Shares, No Par Value 08/06/2012 M 10,000 A $ 22.98 33,256 D Common Shares, No Par Value 08/06/2012 S 10,000 D $ 32.9283 ( 2 ) 23,256 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 Option to Purchase Common Shares $ 32.36 08/03/2012 A 5,150 02/03/2013 08/03/2022 Common Shares, No Par Value 5,150 $ 0 5,150 D Option to Purchase Common Shares $ 20.89 08/06/2012 M 10,000 02/01/2003 08/31/2012 Common Shares, No Par Value 10,000 $ 0 0 D Option to Purchase Common Shares $ 22.98 08/06/2012 M 10,000 02/01/2004 08/30/2013 Common Shares, No Par Value 10,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other WAREHAM JOHN P 5960 HEISLEY ROAD MENTOR, OH44060 X Signatures /s/ Dennis P. Patton, Authorized Representative under Power of Attorney 08/07/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )1,854 of these Common Shares are restricted. The restrictions on these 1,854 Common Shares lapse on February 4, 2013. ( 2 )This represents the average sales price of the shares sold. The actual 19 sales prices ranged from $32.90 per share to $32.9571 per share. Issuer, upon request by the SEC staff, will provide full information regarding the number of shares sold at each of these 19 sales prices.

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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