X0304 4 2011-10-28 0000075362 PACCAR INC PCAR 0001191931 PLIMPTON THOMAS E 777 106TH AVENUE NE BELLEVUE WA 98004 1 0 0 0 COMMON STOCK 2011-10-28 4 M 0 25255 25.31 A 93066 D COMMON STOCK 2011-10-28 4 S 0 25255 43.97 D 67811 D COMMON STOCK 2011-10-28 4 M 0 40000 32.11 A 107811 D COMMON STOCK 2011-10-28 4 S 0 40000 43.98 D 67811 D COMMON STOCK (SIP) 46607.539 D STOCK OPTION 25.31 2011-10-28 4 M 0 25255 D 2007-01-01 2014-01-15 COMMON STOCK 25255 0 D STOCK OPTION 32.11 2011-10-28 4 M 0 40000 D 2008-01-01 2015-01-20 COMMON STOCK 40000 23990 D STOCK OPTION 32.23 2009-01-01 2016-01-26 COMMON STOCK 60354 60354 D STOCK OPTION 44.56 2010-01-01 2017-01-31 COMMON STOCK 46635 46635 D STOCK OPTION 45.74 2011-01-01 2018-01-30 COMMON STOCK 41636 41636 D STOCK OPTION 30.81 2011-08-01 4 J 0 83030 D 2012-01-01 2019-01-31 COMMON STOCK 83030 0 D STOCK OPTION 36.12 2011-08-01 4 J 0 79700 D 2013-01-01 2020-02-02 COMMON STOCK 79700 0 D STOCK OPTION 50.50 2011-08-01 4 J 0 47070 D 2014-01-01 2021-02-03 COMMON STOCK 47070 0 D COMMON STOCK (LTIP) COMMON STOCK 7808.642 7808.642 D COMMON STOCK (DICP) COMMON STOCK 4383.577 4383.577 D Shares held in PACCAR Savings Investment Plan (SIP). Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP). Option forfeited upon retirement Share units held in deferred phantom stock account under LTIP convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions. Share units held in deferred phantom stock account under PACCAR Deferred Incentive Compensation Plan (DICP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions. Thomas E. Plimpton by Janice M. D'Amato POA 2011-10-31