The acquisition of securities of an issuer by a person who, prior to such acquisition, was a beneficial owner of more than five percent of the outstanding securities of the same class as those acquired shall be exempt from section 13(d) of the Act: Provided, That:

(a) The acquisition is made pursuant to preemptive subscription rights in an offering made to all holders of securities of the class to which the preemptive subscription rights pertain;

(b) Such person does not acquire additional securities except through the exercise of his pro rata share of the preemptive subscription rights; and

(c) The acquisition is duly reported, if required, pursuant to section 16(a) of the Act and the rules and regulations thereunder.

(Secs. 3(b), 13(d)(1), 13(d)(2), 13(d)(5), 13(d)(6), 14(d)(1), 23; 48 Stat. 882, 894, 895, 901; sec. 203(a), 49 Stat. 704, sec. 8, 49 Stat. 1379; sec. 10, 78 Stat. 88a; secs. 2, 3, 82 Stat. 454, 455; secs. 1, 2, 3-5, 84 Stat. 1497; secs. 3, 18, 89 Stat. 97, 155 (15 U.S.C. 78c(b), 78m(d)(1), 89m(d)(2), 78m(d)(5), 78m(d)(6), 78n(d)(1), 78w))