X0205 3 2012-05-14 0 0000792977 AMAG PHARMACEUTICALS INC. AMAG 0001214939 HEIDEN WILLIAM K C/O AMAG PHARMACEUTICALS, INC., 100 HAYDEN AVENUE LEXINGTON MA 02421 1 1 0 0 President & CEO Common Stock 0 D /s/Frank Thomas, Attorney-in-Fact 2012-05-16