 STOCKHOLDER RETURN PERFORMANCE GRAPH The following line graph compares the yearly percentage change in the cumulative total stockholder return on the  Company’s common stock, to the cumulative total return of the Standard & Poor’s Composite 500 Stock Index  and the return of two industry peer groups of companies identified in the graph (the Current Peer Group Index  and the Prior Peer Group Index) for the last five fiscal years ending December 31, 2011. Effective January 1, 2011,  the Company revised its peer group to better reflect global manufacturing and the cyclicality of the commercial  vehicle industry. Standard & Poor’s has calculated a return for each company in both the Current Peer Group  Index and the Prior Peer Group Index weighted according to its respective capitalization at the beginning of each  period with dividends reinvested on a monthly basis. Management believes that the identified companies and  methodology used in the graph for the peer group indices provides a better comparison than other indices  available. The Current Peer Group Index consists of AGCO Corporation, Caterpillar Inc., Cummins Inc., Dana  Holding Corporation, Deere & Company, Eaton Corporation, Meritor Inc., Navistar International Corp., Oshkosh  Corporation, Scania AB and AB Volvo. The Prior Peer Group Index consists of Caterpillar Inc., Cummins Inc.,  Danaher Corporation, Deere & Company, Dover Corporation, Eaton Corporation, Harley-Davidson, Inc.,  Honeywell International Inc., Illinois Tool Works Inc., Ingersoll-Rand Company Ltd. and United Technologies  Corporation. The comparison assumes that $100 was invested on December 31, 2006 in the Company’s common  stock and in the stated indices and assumes reinvestment of dividends. 100 2006 2007 2008 2009 2010 2011 150 200 50 50 100 150 200 PACCAR Inc Prior Peer Group Index Current Peer Group Index S&P 500 Index 2006 2007 2008 2009 2010 2011 PACCAR Inc  100 129.80 69.63 89.91 144.20 97.35 S&P 500 Index  100 105.49 66.46 84.05 96.71 98.76 Current Peer Group Index  100 146.02 68.16 100.58 176.38 149.33 Prior Peer Group Index  100 128.24 75.57 104.09 145.81 138.47