Aamoth william l - direct investment history in Steris corp

Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4900 shares at $0 remaining shares owned 4900

Option To Purchase Common Shares Steris Corp Ste exercise price 45.34 has valueitem expiration due date 2023-05-31 underlying security shares 4900 underlying security title Common Shares No Par Value

f6 these options become exercisable as follows: 1,225 on may 31, 2014, 1,225 on may 31, 2015, 1,225 on may 31, 2016 and 1,225 on may 31, 2017.


Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1020 shares at $0 remaining shares owned 8794

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f3 5,525 of these common shares are restricted. the restrictions on these common shares lapse as follows: 2,680 on may 20, 2014, 500 on june 2, 2014, 500 on june 1, 2015, 275 on may 30, 2014, 275 on june 1, 2015, 275 on may 31, 2016, 255 on june 2, 2014, 255 on june 1, 2015, 255 on may 31, 2016 and 255 on may 31, 2017.


Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 165 shares at $45.34 remaining shares owned 7774

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f2 165 shares were withheld from the 500 restricted shares that vested on may 31, 2013. these 165 shares represent the value of the taxes required to be withheld pursuant to applicable employment or tax laws, as determined by the issuer. these 500 shares were awarded to mr. aamoth on may 31, 2011 as part of an award of 2,000 restricted shares. these vested shares were valued at the nyse closing market price on may 31, 2013.


Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 88 shares at $45.87 remaining shares owned 7939

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 88 shares were withheld from the 275 restricted shares that vested on may 30, 2013. these 88 shares represent the value of the taxes required to be withheld pursuant to applicable employment or tax laws, as determined by the issuer. these 275 shares were awarded to mr. aamoth on may 30, 2012 as part of an award of 1,100 restricted shares. these vested shares were valued at the nyse closing market price on may 30, 2013.


Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 634

Common Shares No Par Value Steris Corp Ste

f5 represents 647.872 units of the steris corporation 401(k) plan steris stock fund which equals 634 common share equivalents as of may 31, 2013.


Filed on 2013-06-03 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-032175.txt Sec File: edgar/data/1236375/0001181431-13-032175-index.htm

2013-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f4 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1500 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise date 2013-05-21 exercise price 22.83 has valueitem expiration due date 2019-05-21 underlying security shares 1500 underlying security title Common Shares No Par Value


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4650 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 30.84 has valueitem expiration due date 2018-05-21 underlying security shares 4650 underlying security title Common Shares No Par Value

f5 these options became exercisable as follows: 1,162 on may 21, 2009, 1,162 on may 21, 2010, 1,163 on may 21, 2011 and 1,163 on may 21, 2012.


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1500 shares at $46.0473 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f6 this represents the average sales price of the shares sold. the actual 7 sales prices ranged from $45.9800 per share to $46.1500 per share. issuer, upon request by the sec staff, will provide full information regarding the number of shares sold at each of these 7 sales prices.
f2 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.


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1500 shares at $22.83 remaining shares owned 9527

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4650 shares at $45.9307 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 this represents the average sales price of the shares sold. the actual 27 sales prices ranged from $45.6700 per share to $46.1500 per share. issuer, upon request by the sec staff, will provide full information regarding the number of shares sold at each of these 27 sales prices.


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4650 shares at $30.84 remaining shares owned 12677

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 634

Common Shares No Par Value Steris Corp Ste

f4 represents 647.872 units of the steris corporation 401(k) plan steris stock fund which equals 634 common share equivalents as of may 21, 2013.


Filed on 2013-05-22 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-029746.txt Sec File: edgar/data/1236375/0001181431-13-029746-index.htm

2013-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-28 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4525 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 27.68 has valueitem expiration due date 2017-07-27 underlying security shares 4525 underlying security title Common Shares No Par Value

f8 these options became exercisable as follows: 1,131 on july 27, 2008, 1,131 on july 27, 2009, 1,131 on july 27, 2010 and 1,132 on july 27, 2011.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-25 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2000 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 27.45 has valueitem expiration due date 2016-09-12 underlying security shares 2000 underlying security title Common Shares No Par Value

f7 these options became exercisable as follows: 500 on november 1, 2008, 500 on november 1, 2009, 500 on november 1, 2010 and 500 on november 1, 2011.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-28 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4525 shares at $37.68 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f3 these open market sales of a total of 4,525 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on august 3, 2012.
f4 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.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-28 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4525 shares at $27.68 remaining shares owned 12552

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-25 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2000 shares at $37.4678 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 these open market sales of a total of 2,000 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on august 3, 2012.
f2 this represents the average sales price of the shares sold. the actual 7 sales prices ranged from $37.45 per share to $37.50 per share. issuer, upon request by the sec staff, will provide full information regarding the number of shares sold at each of these 7 sales prices.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-25 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2000 shares at $27.45 remaining shares owned 10027

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-25 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f6 represents 647.944 units of the steris corporation 401(k) plan steris stock fund which equals 635 common share equivalents as of january 28, 2013.


Filed on 2013-01-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-13-005400.txt Sec File: edgar/data/1236375/0001181431-13-005400-index.htm

2013-01-25 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f5 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2012-09-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-051878.txt Sec File: edgar/data/1236375/0001181431-12-051878-index.htm

2012-09-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4157 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 24.72 has valueitem expiration due date 2016-09-12 underlying security shares 4157 underlying security title Common Shares No Par Value

f5 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.


Filed on 2012-09-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-051878.txt Sec File: edgar/data/1236375/0001181431-12-051878-index.htm

2012-09-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4157 shares at $35.7211 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 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.
f2 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.


Filed on 2012-09-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-051878.txt Sec File: edgar/data/1236375/0001181431-12-051878-index.htm

2012-09-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4157 shares at $24.72 remaining shares owned 12184

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2012-09-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-051878.txt Sec File: edgar/data/1236375/0001181431-12-051878-index.htm

2012-09-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 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.


Filed on 2012-09-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-051878.txt Sec File: edgar/data/1236375/0001181431-12-051878-index.htm

2012-09-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2012-09-05 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-048627.txt Sec File: edgar/data/1236375/0001181431-12-048627-index.htm

2012-09-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4500 shares at $0 remaining shares owned 1500

Employee Stock Option Exercise Steris Corp Ste exercise price 22.83 has valueitem expiration due date 2019-05-21 underlying security shares 4500 underlying security title Common Shares No Par Value

f5 these options became exercisable as follows: 1,500 on may 21, 2010, 1,500 on may 21, 2011 and 1,500 on may 21, 2012.


Filed on 2012-09-05 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-048627.txt Sec File: edgar/data/1236375/0001181431-12-048627-index.htm

2012-09-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4500 shares at $34.83 remaining shares owned 8027

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 these open market sales of a total of 4,500 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on august 3, 2012.
f2 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.


Filed on 2012-09-05 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-048627.txt Sec File: edgar/data/1236375/0001181431-12-048627-index.htm

2012-09-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4500 shares at $22.83 remaining shares owned 12527

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2012-09-05 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-048627.txt Sec File: edgar/data/1236375/0001181431-12-048627-index.htm

2012-09-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.151 units of the steris corporation 401(k) plan steris stock fund which equals 635 common share equivalents as of september 4, 2012.


Filed on 2012-09-05 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-048627.txt Sec File: edgar/data/1236375/0001181431-12-048627-index.htm

2012-09-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2012-06-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-034070.txt Sec File: edgar/data/1236375/0001181431-12-034070-index.htm

2012-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 5200 shares at $0 remaining shares owned 5200

Option To Purchase Common Shares Steris Corp Ste exercise price 29.94 has valueitem expiration due date 2022-05-30 underlying security shares 5200 underlying security title Common Shares No Par Value

f5 these options become exercisable as follows: 1,300 on may 30, 2013, 1,300 on may 30, 2014, 1,300 on may 30, 2015 and 1,300 on may 30, 2016.


Filed on 2012-06-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-034070.txt Sec File: edgar/data/1236375/0001181431-12-034070-index.htm

2012-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 167 shares at $29.86 remaining shares owned 10699

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 mr. aamoth elected to have 167 shares withheld from the 500 restricted shares that were awarded to him on may 31, 2011 and which vested on may 31, 2012. these shares were valued as of the nyse closing market price on may 31, 2012.
f2 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 and 500 on june 1, 2015, 275 on may 30, 2013, 275 on may 30, 2014, 275 on june 1, 2015 and 275 on may 30, 2016.


Filed on 2012-06-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-034070.txt Sec File: edgar/data/1236375/0001181431-12-034070-index.htm

2012-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1100 shares at $0 remaining shares owned 10866

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition


Filed on 2012-06-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-034070.txt Sec File: edgar/data/1236375/0001181431-12-034070-index.htm

2012-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.192 units of the steris corporation 401(k) plan steris stock fund which equals 635 common share equivalents as of may 31, 2012.


Filed on 2012-06-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-034070.txt Sec File: edgar/data/1236375/0001181431-12-034070-index.htm

2012-05-30 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2012-05-23 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-031875.txt Sec File: edgar/data/1236375/0001181431-12-031875-index.htm

2012-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 659 shares at $29.59 remaining shares owned 9766

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 mr. aamoth elected to have 659 shares withheld from the 2,000 restricted shares that were awarded to him on may 21, 2009 and which vested on may 21, 2012. these shares were valued as of the nyse closing market price on may 21, 2012.
f2 4,680 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, 2012, 500 on may 31, 2013, 500 on june 2, 2014 and 500 on june 1, 2015.


Filed on 2012-05-23 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-031875.txt Sec File: edgar/data/1236375/0001181431-12-031875-index.htm

2012-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.192 units of the steris corporation 401(k) plan steris stock fund which equals 635 common share equivalents as of may 21, 2012.


Filed on 2012-05-23 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-12-031875.txt Sec File: edgar/data/1236375/0001181431-12-031875-index.htm

2012-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2011-06-02 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-034163.txt Sec File: edgar/data/1236375/0001181431-11-034163-index.htm

2011-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 8000 shares at $0 remaining shares owned 8000

Option To Purchase Common Shares Steris Corp Ste exercise price 36.09 has valueitem expiration due date 2021-05-31 underlying security shares 8000 underlying security title Common Shares No Par Value

f4 these options become exercisable as follows: 2,000 on may 31, 2012, 2,000 on may 31, 2013, 2,000 on may 31, 2014 and 2,000 on may 31, 2015.


Filed on 2011-06-02 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-034163.txt Sec File: edgar/data/1236375/0001181431-11-034163-index.htm

2011-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2000 shares at $0 remaining shares owned 10425

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 6,680 of these common shares are restricted. the restrictions on these common shares lapse as follows: 2,000 on may 21, 2012, 2,680 on may 20, 2014, 500 on may 31, 2012, 500 on may 31, 2013, 500 on june 2, 2014 and 500 on june 1, 2015.


Filed on 2011-06-02 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-034163.txt Sec File: edgar/data/1236375/0001181431-11-034163-index.htm

2011-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 634

Common Shares No Par Value Steris Corp Ste

f3 this represents 648.470 units of the steris corporation 401(k) plan steris stock fund which equals 634 common share equivalents as of may 31, 2011.


Filed on 2011-06-02 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-034163.txt Sec File: edgar/data/1236375/0001181431-11-034163-index.htm

2011-05-31 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f2 this represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2011-05-25 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-032580.txt Sec File: edgar/data/1236375/0001181431-11-032580-index.htm

2011-05-23 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 527 shares at $34.78 remaining shares owned 8425

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 mr.aamoth elected to have 527 shares withheld from the 1,600 restricted shares that were awarded to him on may 21, 2008 and which vested on may 23, 2011. these shares were valued as of the nyse closing market price on may 23, 2011.
f2 4,680 of these common shares are restricted. the restrictions on these common shares lapse as follows: 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2011-05-25 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-032580.txt Sec File: edgar/data/1236375/0001181431-11-032580-index.htm

2011-05-23 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.470 units of the steris corporation 401(k) plan steris stock fund which equals 635 common share equivalents as of march 23, 2011.


Filed on 2011-05-25 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-11-032580.txt Sec File: edgar/data/1236375/0001181431-11-032580-index.htm

2011-05-23 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2010-12-21 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-063093.txt Sec File: edgar/data/1236375/0001181431-10-063093-index.htm

2010-12-17 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 43 shares at $0 remaining shares owned 4157

Employee Stock Option Exercise Steris Corp Ste exercise date 2007-09-12 exercise price 24.72 has valueitem expiration due date 2016-09-12 underlying security shares 43 underlying security title Common Shares No Par Value


Filed on 2010-12-21 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-063093.txt Sec File: edgar/data/1236375/0001181431-10-063093-index.htm

2010-12-17 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 43 shares at $38 remaining shares owned 8952

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 these open market sales of a total of 43 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on may 10, 2010.
f2 6,280 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,600 on may 23, 2011, 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2010-12-21 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-063093.txt Sec File: edgar/data/1236375/0001181431-10-063093-index.htm

2010-12-17 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 43 shares at $24.72 remaining shares owned 8995

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2010-12-21 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-063093.txt Sec File: edgar/data/1236375/0001181431-10-063093-index.htm

2010-12-17 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.646 units of the steris corporation 401(k) plan steris stock fund which equals 635 share equivalents as of december 17, 2010.


Filed on 2010-12-21 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-063093.txt Sec File: edgar/data/1236375/0001181431-10-063093-index.htm

2010-12-17 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2010-12-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-061169.txt Sec File: edgar/data/1236375/0001181431-10-061169-index.htm

2010-12-10 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 9000 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 24.45 has valueitem expiration due date 2015-06-16 underlying security shares 9000 underlying security title Common Shares No Par Value

f5 these options became exercisable as follows: 2,250 on may 16, 2006, 2,250 on may 16, 2007, 2,250 on may 16, 2008 and 2,250 on may 16, 2009.


Filed on 2010-12-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-061169.txt Sec File: edgar/data/1236375/0001181431-10-061169-index.htm

2010-12-10 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 9000 shares at $37.056 remaining shares owned 8952

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 these open market sales of a total of 9,000 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on may 10, 2010.
f2 6,280 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,600 on may 23, 2011, 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2010-12-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-061169.txt Sec File: edgar/data/1236375/0001181431-10-061169-index.htm

2010-12-10 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 9000 shares at $24.45 remaining shares owned 17952

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2010-12-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-061169.txt Sec File: edgar/data/1236375/0001181431-10-061169-index.htm

2010-12-10 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.646 units of the steris corporation 401(k) plan steris stock fund which equals 635 share equivalents as of december 10, 2010.


Filed on 2010-12-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-061169.txt Sec File: edgar/data/1236375/0001181431-10-061169-index.htm

2010-12-10 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2010-12-06 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-059538.txt Sec File: edgar/data/1236375/0001181431-10-059538-index.htm

2010-12-03 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4500 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 22.58 has valueitem expiration due date 2013-05-23 underlying security shares 4500 underlying security title Common Shares No Par Value

f5 these options became exercisable as follows: 1,500 on april 23, 2006 and 3,000 on april 23, 2007.


Filed on 2010-12-06 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-059538.txt Sec File: edgar/data/1236375/0001181431-10-059538-index.htm

2010-12-03 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 4500 shares at $36.047 remaining shares owned 8952

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 these open market sales of a total of 4,500 common shares is pursuant to a rule 10b5-1 stock trading plan entered into by the reporting person on may 10, 2010.
f2 6,280 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,600 on may 23, 2011, 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2010-12-06 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-059538.txt Sec File: edgar/data/1236375/0001181431-10-059538-index.htm

2010-12-03 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4500 shares at $22.58 remaining shares owned 13452

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2010-12-06 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-059538.txt Sec File: edgar/data/1236375/0001181431-10-059538-index.htm

2010-12-03 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 635

Common Shares No Par Value Steris Corp Ste

f4 represents 648.685 units of the steris corporation 401(k) plan steris stock fund which equals 635 share equivalents as of december 3, 2010.


Filed on 2010-12-06 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-059538.txt Sec File: edgar/data/1236375/0001181431-10-059538-index.htm

2010-12-03 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2010-07-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-039089.txt Sec File: edgar/data/1236375/0001181431-10-039089-index.htm

2010-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 480 shares at $31.91 remaining shares owned 8952

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 mr. aamoth elected to have 480 shares withheld from the 1,500 restricted shares that were awarded to him on july 27, 2007 and which vested on july 27, 2010. these shares were valued as of the nyse closing market price on july 27, 2010.
f2 6,280 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,600 on may 23, 2011, 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2010-07-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-039089.txt Sec File: edgar/data/1236375/0001181431-10-039089-index.htm

2010-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 637

Common Shares No Par Value Steris Corp Ste

f4 represents 648.717 units of the steris corporation 401(k) plan steris stock fund which equals 637 share equivalents as of july 27, 2010.


Filed on 2010-07-29 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-039089.txt Sec File: edgar/data/1236375/0001181431-10-039089-index.htm

2010-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in his vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2010-05-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-029035.txt Sec File: edgar/data/1236375/0001181431-10-029035-index.htm

2010-05-20 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 7200 shares at $0 remaining shares owned 7200

Option To Purchase Common Shares Steris Corp Ste exercise price 31.87 has valueitem expiration due date 2020-05-20 underlying security shares 7200 underlying security title Common Shares No Par Value

f4 these options become exercisable as follows: 1,800 on may 20, 2011, 1,800 on may 20, 2012, 1,800 on may 20, 2013 and 1,800 on may 20, 2014.


Filed on 2010-05-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-029035.txt Sec File: edgar/data/1236375/0001181431-10-029035-index.htm

2010-05-20 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2680 shares at $0 remaining shares owned 9432

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 7,780 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,500 on july 27, 2010, 1,600 on may 23, 2011, 2,000 on may 21, 2012 and 2,680 on may 20, 2014.


Filed on 2010-05-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-029035.txt Sec File: edgar/data/1236375/0001181431-10-029035-index.htm

2010-05-20 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 624

Common Shares No Par Value Steris Corp Ste

f3 represents 648.7163 units of the steris corporation 401(k) plan steris stock fund which equals 624 share equivalents as of may 20, 2010.


Filed on 2010-05-24 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-10-029035.txt Sec File: edgar/data/1236375/0001181431-10-029035-index.htm

2010-05-20 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f2 represents an investment by mr. aamoth in the vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2009-09-09 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-043187.txt Sec File: edgar/data/1236375/0001181431-09-043187-index.htm

2009-09-08 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 448 shares at $28.21 remaining shares owned 6752

Common Shares No Par Value Steris Corp Ste Transaction code: F Payment of exercise price or tax liability by delivering or withholding securities

f1 mr. aamoth elected to have 448 shares withheld from the 1,400 restricted shares that were awarded to him on september 7, 2006 and which vested on september 7, 2009. these shares were valued as of the nyse closing market price on september 8, 2009, the first trading day following the vesting of these shares.
f2 5,100 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,500 on july 27, 2010, 1,600 on may 23, 2011 and 2,000 on may 21, 2012.


Filed on 2009-09-09 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-043187.txt Sec File: edgar/data/1236375/0001181431-09-043187-index.htm

2009-09-08 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 629

Common Shares No Par Value Steris Corp Ste

f4 represents 646.3096 units of the steris corporation 401(k) plan steris stock fund which equals 629 share equivalents as of september 8, 2009.


Filed on 2009-09-09 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-043187.txt Sec File: edgar/data/1236375/0001181431-09-043187-index.htm

2009-09-08 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f3 represents an investment by mr. aamoth in the vanguard william l. aamoth - rollover ira brokerage account.


Filed on 2009-05-26 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-027011.txt Sec File: edgar/data/1236375/0001181431-09-027011-index.htm

2009-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 6000 shares at $0 remaining shares owned 6000

Option To Purchase Common Shares Steris Corp Ste exercise price 22.83 has valueitem expiration due date 2019-05-21 underlying security shares 6000 underlying security title Common Shares No Par Value

f3 these options become exercisable as follows: 1,500 on may 21, 2010, 1,500 on may 21, 2011, 1,500 on may 21, 2012 and 1,500 on may 21, 2013.


Filed on 2009-05-26 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-027011.txt Sec File: edgar/data/1236375/0001181431-09-027011-index.htm

2009-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2000 shares at $0 remaining shares owned 7200

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 6,500 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,400 on september 7, 2009, 1,500 on july 27, 2010, 1,600 on may 23, 2011 and 2,000 on may 21, 2012.


Filed on 2009-05-26 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-09-027011.txt Sec File: edgar/data/1236375/0001181431-09-027011-index.htm

2009-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 91

Common Shares No Par Value Steris Corp Ste

f2 represents 93.7033 units of the steris corporation 401(k) plan steris fund which equals 91 share equivalents as of may 21, 2009.


Filed on 2008-08-04 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-045875.txt Sec File: edgar/data/1236375/0001181431-08-045875-index.htm

2008-08-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 7500 shares at $0 remaining shares owned 4500

Employee Stock Option Exercise Steris Corp Ste exercise price 22.58 has valueitem expiration due date 2013-05-23 underlying security shares 7500 underlying security title Common Shares No Par Value

f2 these options became exercisable as follows: 3,000 on april 23, 2004, 3,000 on april 23, 2005 and 1,500 on april 23, 2006.


Filed on 2008-08-04 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-045875.txt Sec File: edgar/data/1236375/0001181431-08-045875-index.htm

2008-08-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 7500 shares at $35.4581 remaining shares owned 5200

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 4,500 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,400 on september 7, 2009, 1,500 on july 27, 2010, and 1,600 on may 23, 2011.


Filed on 2008-08-04 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-045875.txt Sec File: edgar/data/1236375/0001181431-08-045875-index.htm

2008-08-04 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 7500 shares at $22.58 remaining shares owned 12700

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2008-05-23 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-034407.txt Sec File: edgar/data/1236375/0001181431-08-034407-index.htm

2008-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4650 shares at $0 remaining shares owned 4650

Option To Purchase Common Shares Steris Corp Ste exercise price 30.84 has valueitem expiration due date 2018-05-21 underlying security shares 4650 underlying security title Common Shares No Par Value

f2 these options become exercisable in 25% increments on may 21, 2009, may 21, 2010, may 21, 2011 and may 21, 2012.


Filed on 2008-05-23 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-034407.txt Sec File: edgar/data/1236375/0001181431-08-034407-index.htm

2008-05-21 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1600 shares at $0 remaining shares owned 5200

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 4,500 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,400 on september 7, 2009, 1,500 on july 27, 2010, and 1,600 on may 23, 2011.


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 7500 shares at $0 remaining shares owned 0

Employee Stock Option Exercise Steris Corp Ste exercise price 19.60 has valueitem expiration due date 2012-05-23 underlying security shares 7500 underlying security title Common Shares No Par Value

f4 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.


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1011 shares at $31.46 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f3 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.


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1496 shares at $31.7215 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f2 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.


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2100 shares at $31.3016 remaining shares owned 3600

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 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.


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 5400 shares at $31.30 remaining shares owned 5700

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities


Filed on 2008-05-14 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-08-031167.txt Sec File: edgar/data/1236375/0001181431-08-031167-index.htm

2008-05-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 7500 shares at $19.60 remaining shares owned 11100

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2007-11-05 by Aamoth William L SEC CIK 1236375 Form 4/a

Accession 0001181431-07-066175.txt Sec File: edgar/data/1236375/0001181431-07-066175-index.htm

2007-11-01 Aamoth William L (CIK 1236375) through Direct (V P Corporate Treasurer)

Invested in Steris Corp bought 2000 shares at $0 remaining shares owned 2000

Option To Purchase Common Shares Steris Corp Ste exercise price 27.45 has valueitem expiration due date 2017-11-01 underlying security shares 2000 underlying security title Common Shares No Par Value

f1 this amended form 4 is being filed solely to correct the exercise price to accurately reflect the closing stock price on the date of grant.
f2 these options become exercisable in 25% increments on november 1, 2008, november 1, 2009, november 1, 2010 and november 1, 2011.


Filed on 2007-11-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-065575.txt Sec File: edgar/data/1236375/0001181431-07-065575-index.htm

2007-11-01 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2000 shares at $0 remaining shares owned 2000

Option To Purchase Common Shares Steris Corp Ste exercise price 27.41 has valueitem expiration due date 2017-11-01 underlying security shares 2000 underlying security title Common Shares No Par Value

f4 these options become exercisable in 25% increments on november 1, 2008, november 1, 2009, november 1, 2010 and november 1, 2011.


Filed on 2007-11-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-065575.txt Sec File: edgar/data/1236375/0001181431-07-065575-index.htm

2007-11-01 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 700 shares at $0 remaining shares owned 3600

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 all 3,600 of these common shares are restricted. the restrictions on these common shares lapse as follows: 1,400 on september 7, 2009, 1,500 on july 27, 2010 and 700 thirty (30) days following the first day of employment of the company's chief financial officer, as elected by the company's board of directors after the november 1, 2007 date of grant.


Filed on 2007-11-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-065575.txt Sec File: edgar/data/1236375/0001181431-07-065575-index.htm

2007-11-01 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 1469

Common Shares No Par Value Steris Corp Ste

f3 represents 1,523.0163 units of the steris corporation 401(k) plan steris fund which equals 1,469 share equivalents as of october 31, 2007.


Filed on 2007-11-01 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-065575.txt Sec File: edgar/data/1236375/0001181431-07-065575-index.htm

2007-11-01 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 1000

Common Shares No Par Value Steris Corp Ste

f2 shares held by the william l. aamoth rollover ira.


Filed on 2007-07-30 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-048272.txt Sec File: edgar/data/1236375/0001181431-07-048272-index.htm

2007-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4525 shares at $0 remaining shares owned 4525

Option To Purchase Common Shares Steris Corp Ste exercise price 27.68 has valueitem expiration due date 2017-07-27 underlying security shares 4525 underlying security title Common Shares No Par Value

f4 these options become exercisable in 25% increments on july 27, 2008, july 27, 2009, july 27, 2010 and july 27, 2011.


Filed on 2007-07-30 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-048272.txt Sec File: edgar/data/1236375/0001181431-07-048272-index.htm

2007-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1500 shares at $0 remaining shares owned 2900

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 all 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.


Filed on 2007-07-30 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-048272.txt Sec File: edgar/data/1236375/0001181431-07-048272-index.htm

2007-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 1453

Common Shares No Par Value Steris Corp Ste

f3 represents 1,519.7438 units of the steris fund which equals 1,453 share equivalents as of july 27, 2007.


Filed on 2007-07-30 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-07-048272.txt Sec File: edgar/data/1236375/0001181431-07-048272-index.htm

2007-07-27 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 1000

Common Shares No Par Value Steris Corp Ste

f2 shares held by the william l. aamoth rollover ira.


Filed on 2006-09-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-06-052745.txt Sec File: edgar/data/1236375/0001181431-06-052745-index.htm

2006-09-12 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 4200 shares at $0 remaining shares owned 4200

Option To Purchase Common Shares Steris Corp Ste exercise price 24.72 has valueitem expiration due date 2016-09-12 underlying security shares 4200 underlying security title Common Shares No Par Value

f1 these options become exercisable in 25% increments on september 12, 2007, september 12, 2008, september 12, 2009 and september 12, 2010.


Filed on 2006-09-11 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-06-052152.txt Sec File: edgar/data/1236375/0001181431-06-052152-index.htm

2006-09-07 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1400 shares at $0 remaining shares owned 1400

Common Shares No Par Value Steris Corp Ste Transaction code: A Grant, award, or other acquisition

f1 these common shares are restricted and vest on september 7, 2009.


Filed on 2006-09-11 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-06-052152.txt Sec File: edgar/data/1236375/0001181431-06-052152-index.htm

2006-09-07 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 1089

Common Shares No Par Value Steris Corp Ste

f3 represents 1,117.2929 units held in the steris fund of the steris corporation 401(k) plan. these units are the equivalent of 1,089 steris corporation common shares.


Filed on 2006-09-11 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-06-052152.txt Sec File: edgar/data/1236375/0001181431-06-052152-index.htm

2006-09-07 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 500

Common Shares No Par Value Steris Corp Ste

f2 shares are held by the william l. aamoth ira.


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2500 shares at $0 remaining shares owned 7500

Stock Option Exercise Steris Corp Ste exercise price 19.60 has valueitem expiration due date 2012-05-23 underlying security shares 2500 underlying security title Common Shares No Par Value

f2 the date these 2,500 stock options became exercisable was 04/23/03.


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2500 shares at $0 remaining shares owned 0

Stock Option Exercise Steris Corp Ste exercise price 18.25 has valueitem expiration due date 2011-04-05 underlying security shares 2500 underlying security title Common Shares No Par Value

f1 the dates these stock options became exercisable are as follows: 625 on 03/05/02; 625 on 03/05/03; 625 on 03/05/04; and 625 on 03/05/05.


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1000 shares at $25.89 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1000 shares at $19.60 remaining shares owned 1000

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1500 shares at $25.86 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 1500 shares at $19.60 remaining shares owned 1500

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2500 shares at $25.86 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities


Filed on 2005-08-12 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-046525.txt Sec File: edgar/data/1236375/0001181431-05-046525-index.htm

2005-08-11 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 2500 shares at $18.25 remaining shares owned 2500

Common Shares No Par Value Steris Corp Ste Transaction code: M Exercise or conversion of derivative security


Filed on 2005-05-18 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-05-028888.txt Sec File: edgar/data/1236375/0001181431-05-028888-index.htm

2005-05-16 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp bought 9000 shares at $0 remaining shares owned 9000

Option To Purchase Common Shares Steris Corp Ste exercise price 24.45 has valueitem expiration due date 2015-06-16 underlying security shares 9000 underlying security title Common Shares No Par Value

f1 these options become exercisable in 25% increments on may 16, 2006, may 16, 2007, may 16, 2008, and may 16, 2009.


Filed on 2004-02-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-04-009155.txt Sec File: edgar/data/1236375/0001181431-04-009155-index.htm

2004-02-13 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 1200 shares at $26.15 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f2 sold shares had been held in the name of william l. aamoth and sharon l. aamoth, jtwros.


Filed on 2004-02-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-04-009155.txt Sec File: edgar/data/1236375/0001181431-04-009155-index.htm

2004-02-13 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 500 shares at $26.18 remaining shares owned 1200

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f2 sold shares had been held in the name of william l. aamoth and sharon l. aamoth, jtwros.


Filed on 2004-02-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-04-009155.txt Sec File: edgar/data/1236375/0001181431-04-009155-index.htm

2004-02-13 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 250 shares at $26.19 remaining shares owned 1700

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f2 sold shares had been held in the name of william l. aamoth and sharon l. aamoth, jtwros.


Filed on 2004-02-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-04-009155.txt Sec File: edgar/data/1236375/0001181431-04-009155-index.htm

2004-02-13 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp sold 2500 shares at $26.19 remaining shares owned 0

Common Shares No Par Value Steris Corp Ste Transaction code: S Open market or private sale of securities

f1 sold shares had been held by the william l. aamoth ira.


Filed on 2004-02-13 by Aamoth William L SEC CIK 1236375 Form 4

Accession 0001181431-04-009155.txt Sec File: edgar/data/1236375/0001181431-04-009155-index.htm

2004-02-13 Aamoth William L (CIK 1236375) through Direct (V P - Corporate Treasurer)

Invested in Steris Corp remaining shares owned 551

Common Shares No Par Value Steris Corp Ste

f3 held by william l. aamoth in the steris corporation 401(k) plan.