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SEC FORM 4 SEC Form 4
FORM 4 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
or Section 30(h) of the Investment Company Act of 1940 		 
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
AAMOTH WILLIAM L
(Last) (First) (Middle)
5960 HEISLEY ROAD
(Street)
MENTOR OH 44060
(City) (State) (Zip)
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)
V P - Corporate Treasurer
3. Date of Earliest Transaction (Month/Day/Year)
05/12/2008
4. If Amendment, Date of 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
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 05/12/2008 M 7,500 A $19.6 11,100 D
Common Shares, No Par Value 05/12/2008 S 5,400 D $31.3 5,700 D
Common Shares, No Par Value 05/12/2008 S 2,100 D $31.3016 3,600(1) D
Common Shares, No Par Value 05/12/2008 S 1,496 D $31.7215 0 I See Footnote Below.(2)
Common Shares, No Par Value 05/12/2008 S 1,011 D $31.46 0 I See Footnote Below.(3)
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 Securities Underlying Derivative Security (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: 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 Exercise $19.6 05/12/2008 M 7,500 (4) 05/23/2012 Common Shares, No Par Value 7,500 $0 0 D
Explanation of Responses:
1. 2,900 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 1,400 on September 7, 2009 and 1,500 on July 27, 2010.
2. This transaction represents an investment transfer by Mr. Aamoth in the STERIS Corporation 401(k) Plan. Mr. Aamoth transferred $47,455.41 from the STERIS Stock Fund to another Fund under the Plan. The amount represents 1,529.65418 units of the STERIS Corporation 401(k) Plan STERIS Fund which equals 1,496 share equivalents as of May 12, 2008.
3. This transaction represents an investment transfer by Mr. Aamoth in the William L. Aamoth Rollover IRA. Mr. Aamoth sold the 1,011 STERIS Common Shares held by the William L. Aamoth Rollover IRA for $31.46 per share.
4. These options became exercisable as follows: 2,500 on April 23, 2004, 2,500 on April 23, 2005 and 2,500 on April 23, 2006.
Dennis P. Patton, Authorized Representative under Power of Attorney 05/14/2008
** Signature of Reporting Person Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.