X0203 3 2009-03-31 0 0001432987 Atlas Resources Public #18-2008 (A) L.P. ATLS 0001287922 ATLAS RESOURCES LLC WESTPOINTE CORPORATE CENTER ONE 1550 CORAPOLIS HEIGHTS RD. 2ND. FLOOR MOON TOWNSHIP PA 15108 0 0 0 1 Managing General Partner Managing General Partner Interest 8432.61 D Investor General Partner Units 0 D Converted Limited Partner Units 0 D Limited Partner Units 0 D /s/ Jack L. Hollander 2009-03-31