X0303 5 2009-12-31 0 0 0 0000015393 BUREAU OF NATIONAL AFFAIRS INC none 0001262370 BOLBACH CYNTHIA J 1801 S. BELL STREET ARLINGTON VA 22202 1 1 0 0 Vice President & Corp Sec. BNA 401(k) Plan 2009-03-21 5 P 0 646 15.75 A 44620 I Trust BNA 401(k) Plan 2009-04-02 5 P 0 544 15.75 A 44620 I Trust BNA 401(k) Plan 2009-09-19 5 P 0 664 15.75 A 44620 I Trust BNA 401(k) Plan 2009-10-01 5 P 0 587 15.75 A 44620 I Trust Cynthia J. Bolbach 2010-01-04