May 1981

May 1981: 317 companies

May 1, 1981 8 companies

May 3, 1981 5 companies

May 6, 1981 36 companies

May 8, 1981 17 companies

May 11, 1981 25 companies

May 14, 1981 28 companies

May 20, 1981 14 companies

May 21, 1981 47 companies

May 25, 1981 27 companies

May 26, 1981 28 companies

May 31, 1981 82 companies