Ownership Submission
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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
MOSS ROBERT E
   2. Issuer Name and Ticker or Trading Symbol
STERIS CORP [STE] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Senior Vice President
(Last)
(First)
(Middle)
5960 HEISLEY ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
05/13/2015
(Street)

MENTOR, OH 44060		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 05/13/2015   M   9,130 A $ 30.84 35,841 D  
Common Shares, No Par Value 05/13/2015   F   4,173 D $ 67.49 (1) 31,668 D  
Common Shares, No Par Value 05/13/2015   M   9,000 A $ 22.83 40,668 D  
Common Shares, No Par Value 05/13/2015   F   5,001 D $ 67.49 (1) 35,667 D  
Common Shares, No Par Value 05/13/2015   M   3,000 A $ 30.51 38,667 D  
Common Shares, No Par Value 05/13/2015   F   1,897 D $ 67.49 (1) 36,770 D  
Common Shares, No Par Value 05/13/2015   M   11,000 A $ 31.87 47,770 D  
Common Shares, No Par Value 05/13/2015   F   7,638 D $ 67.49 (1) 40,132 D  
Common Shares, No Par Value 05/13/2015   M   10,875 A $ 36.09 51,007 D  
Common Shares, No Par Value 05/13/2015   F   8,217 D $ 67.49 (1) 42,790 D  
Common Shares, No Par Value 05/13/2015   M   8,000 A $ 29.94 50,790 D  
Common Shares, No Par Value 05/13/2015   F   5,661 D $ 67.49 (1) 45,129 D  
Common Shares, No Par Value 05/13/2015   M   2,500 A $ 45.34 47,629 D  
Common Shares, No Par Value 05/13/2015   F   2,069 D $ 67.49 (1) 45,560 (2) D  
Common Shares, No Par Value               13,822 I See Footnote Below. (3)

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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
Employee Stock Option (right to buy) $ 30.84 05/13/2015   M     9,130   (4) 05/21/2018 Common Shares, No Par Value 9,130 $ 0 0 D  
Employee Stock Option (right to buy) $ 22.83 05/13/2015   M     9,000   (5) 05/21/2019 Common Shares, No Par Value 9,000 $ 0 0 D  
Employee Stock Option (right to buy) $ 30.51 05/13/2015   M     3,000   (6) 10/06/2019 Common Shares, No Par Value 3,000 $ 0 0 D  
Employee Stock Option (right to buy) $ 31.87 05/13/2015   M     11,000   (7) 05/20/2020 Common Shares, No Par Value 11,000 $ 0 0 D  
Employee Stock Option (right to buy) $ 36.09 05/13/2015   M     10,875   (8) 05/31/2021 Common Shares, No Par Value 10,875 $ 0 3,625 D  
Employee Stock Option (right to buy) $ 29.94 05/13/2015   M     8,000   (9) 05/30/2022 Common Shares, No Par Value 8,000 $ 0 4,000 D  
Employee Stock Option (right to buy) $ 45.34 05/13/2015   M     2,500   (10) 05/31/2023 Common Shares, No Par Value 2,500 $ 0 7,500 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MOSS ROBERT E
5960 HEISLEY ROAD
MENTOR, OH 44060		       Senior Vice President  

Signatures

 /s/ Dennis P. Patton, Authorized Representative under Power of Attorney   05/14/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Closing market price on the NYSE on the day on which the cashless stock option transaction occurred.
(2) 5,800 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 800 on June 1, 2015; 800 on June 1, 2015; 1,000 on June 1, 2015; 1,000 on May 31, 2016; 1,000 on May 31, 2017; 600 on June 1, 2015 and 600 on May 30, 2016.
(3) This indirect ownership by Mr. Moss is through the Moss Family Trust, Robert E. Moss and Patricia J. Moss as Co-Trustees dated May 24, 1999.
(4) These options became exercisable as follows: 2,282 on May 21, 2009; 2,283 on May 21, 2010; 2,282 on May 21, 2011 and 2,283 on May 21, 2012.
(5) These options became exercisable as follows: 2,250 on May 21, 2010; 2,250 on May 21, 2011; 2,250 on May 21, 2012 and 2,250 on May 21, 2013.
(6) These options became exercisable as follows: 750 on October 6, 2010; 750 on October 6, 2011; 750 on October 6, 2012 and 750 on October 6, 2013.
(7) These options became exercisable as follows: 2,750 on May 20, 2011; 2,750 on May 20, 2012; 2,750 on May 20, 2013; and 2,750 on May 20, 2014.
(8) These options became exercisable as follows: 3,625 on May 31, 2012; 3,625 on May 31, 2013; and 3,625 on May 31, 2014.
(9) These options became exercisable as follows: 4,000 on May 30, 2013; and 4,000 on May 30, 2014.
(10) These options became exercisable as follows: 2,500 on May 31, 2014.

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