X0202 4 2006-06-14 0 0001168455 PLUMAS BANCORP plbc 0001207333 IRVINE DENNIS C PLUMAS BANK 35 S LINDAN AVE QUINCY CA 95971 0 1 0 0 EVP & CITO Common Stock 2006-06-14 4 X 1 3500 4.957 A 14784 I Via 401K Plan Common Stock 2006-06-14 4 S 1 1000 16.9891 D 13784 I Via 401k Plan Common Stock 2006-09-26 4 X 1 1900 4.957 A 15684 I Via 401K Plan Common Stock 2006-09-26 4 S 1 552 16.9576 D 15132 I Via 401K Plan Option to buy common stock 4.957 2006-06-14 4 X 1 3500 4.957 D 2002-06-21 2008-11-18 Common Stock 3500 25420 D Option to buy common stock 4.957 2006-09-26 4 X 1 1900 4.957 D 2002-06-21 2008-11-18 Common Stock 1900 23520 D Shares held both indirectly and directly. See breakdown of shares owned in following footnote Shares held directly 8,810, Shares held indirectly by 410K Plan 6,322 Dennis Irvine 2006-09-27