X0201 4/A 2003-10-27 2003-10-28 0 0000319201 KLA TENCOR CORP klac 0001182169 SCHROEDER KENNETH L C/O KLA-TENCOR CORP. 160 RIO ROBLES SAN JOSE CA 95134 1 1 0 0 Chief Executive Officer Common Stock 211230 D Non-Qualified Stock Option 10.63 1999-08-31 2008-08-31 Common Stock 129272 129272 D Non-Qualified Stock Option 16.97 1999-10-23 2008-10-23 Common Stock 220728 220728 D Non-Qualified Stock Option 26.25 2001-11-10 2010-11-10 Common Stock 37900 37900 D Non-Qualified Stock Option 29.31 2002-10-02 2011-10-02 Common Stock 341100 341100 D Non-Qualified Stock Option 32.75 2002-04-04 2011-04-04 Common Stock 37900 37900 D Non-Qualified Stock Option 33.75 2000-10-27 2009-10-27 Common Stock 150000 150000 D Non-Qualified Stock Option 34.67 2003-11-08 2013-01-28 Common Stock 62900 62900 D Non-Qualified Stock Option 37.05 2003-11-08 2012-11-08 Common Stock 31450 31450 D Non-Qualified Stock Option 44.6875 2000-08-13 2010-08-13 Common Stock 75800 75800 D Non-Qualified Stock Option 51.229 2003-11-08 2013-07-30 Common Stock 31450 31450 D Non-Qualified Stock Option 53.86 2003-10-27 4 A 0 29680 53.86 A 2004-10-27 2013-10-27 Common Stock 29680 29680 D Non-Qualified Stock Option 53.86 2003-10-27 4 A 0 30320 53.86 A 2006-10-27 2013-10-27 Common Stock 30320 30320 D Original Form 4 filing amended to reflect change in number of options and lengthened vesting schedule. Kenneth L. Schroeder 2003-10-29