Edgar Filing: STERIS CORP

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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3235-0287

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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

AAMOTH WILLIAM L

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

(Last)

(First)

(Middle)

5960 HEISLEY ROAD

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2008

(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)
1.Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
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⁾

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option Exercise

$ 19.6

05/12/2008

7,500

⁽⁴⁾

05/23/2012

Common Shares, No Par Value

7,500

$ 0

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
AAMOTH WILLIAM L 5960 HEISLEY ROAD MENTOR, OH 44060			V P - Corporate Treasurer

Signatures

Dennis P. Patton, Authorized Representative under Power of Attorney		05/14/2008
^**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)	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.

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