walgreens boots alliance inc wba said late wednesday its board has declared a quarterly dividend of 48 cents a share an increase of 05 the dividend is payable on sept 9 to stockholders of record as of aug 19 the company said and it raises the annual rate from 191 a share to 192 a share shares of walgreens boots alliance edged 02 higher in the afterhours session after ending the regular trading day down 19