ing. See Mallis, supra, 568 F.2d at 829. In Blue Chip the Supreme Court adopted the Birnbaum48 rule which limits standing in § 10(b)/Rule 10b-5 cases to actual purchasers and sellers of securities. The Court was persuaded to adopt the rule because of both its longstanding judicial acceptance in the years since its original enunciation, 421 U.S. at 731-33, 95 S.Ct. 1917, and policy considerations in favor, id. at 737-49, 95 S.Ct. 1917. Those policy considerations were that the Birnbaum rule banned suits by mere potential purchasers or sellers of securities, which suits would necessarily be largely conjectural and speculative and based upon a hypothetical number of shares. The rule also reduced the number of vexatious lawsuits which would be based almost entirely on oral proof. The pledge at issue in this and like cases, contrariwise, is a single concrete event, involves a limited class of persons and a specific amount of securities, and is supported by written documentation, and this lawsuit prays for a precise amount of damages. Blue Chip does not counsel against holding that a pledge is a “purchase or sale” of a security.
ARBITRATION
The district court, after dismissing the federal claims in Mansbach’s complaint, stayed action on all other aspects of the case pending arbitration. Since we have ruled that the court erred in dismissing the federal claims, the question of arbitration is now in a new posture.49
As to the federal claims, the teaching of Wilko v. Swan, 346 U.S. 427, 74 S.Ct. 182, 98 L.Ed. 168 (1953), precludes compelling Mansbach to submit the matter to arbitration. The arbitration agreement is overridden by the anti-waiver provisions of the federal securities laws. While Wilko arose under only the Securities Act of 1933, its holding and rationale are equally applicable to cases arising under the Securities Exchange Act of 1934. Merrill Lynch, Pierce, Fenner & Smith, Inc. v. Moore, 590 F.2d 823, 827-29 (10th Cir. 1978); Weissbuch v. Merrill Lynch, Pierce, Fenner & Smith, Inc., 558 F.2d 831, 834-35 (7th Cir. 1977); Ayres v. Merrill Lynch, Pierce, Fenner & Smith, Inc., 538 F.2d 532, 536 (3d Cir.), cert. den. 429 U.S. 1010, 97 S.Ct. 542, 50 L.Ed.2d 619 (1976); Newman v. Shearson, Hammill & Co., 383 F.Supp. 265, 268 (W.D.Tex.1974); Maheu v. Reynolds & Co., 282 F.Supp. 423, 426 (S.D.N.Y.1967); Stockwell v. Reynolds & Co., 252 F.Supp. 215, 220 n. 2 (S.D.N.Y. 1965). This case does not come within the narrow exception to Wilko for cases concerning international securities transactions established in Scherk v. Alberto-Culver Co., 417 U.S. 506, 94 S.Ct. 2449, 41 L.Ed.2d 270 (1974). See Merrill Lynch, supra, 590 F.2d at 827-29; Weissbuch, supra, 558 F.2d at 834; Ayres, supra, 538 F.2d at 536-37.
Wilko, however, only precludes forcing Mansbach to arbitrate the federal aspects of his complaint; it is inapplicable to those portions of the complaint based upon state law and in federal court by reason of diversity of citizenship jurisdiction. As a practical matter, though, both the federal and state claims arise out of the same facts and it would be duplicative, at best, for these same facts to be the subject of two simultaneous hearings.50 At worst, the two proceedings could produce inconsistent results.
In order to avoid this problem, on remand the district court should employ one of the two following courses of action. If the district court determines that as to either Count I or II of the complaint the federal claims contain substantially the same elements as the state law claims, so that resolution of the federal claims will necessarily resolve the state claims, then the court should consolidate the federal and state
48
Birnbaum v. Newport Steel Corp., 193 F.2d 461 (2d Cir.), cert. den. 343 U.S. 956, 72 S.Ct. 1051, 96 L.Ed. 1356 (1952). See also Gaudin v. KDI Corp., 576 F.2d 708 (6th Cir. 1978); Marsh v. Armada Corp., supra, 533 F.2d 978.
49
We find no merit in Mansbach’s contention that the arbitration agreement was unenforceable as “unconscionable.”
50
We were informed by counsel at oral argument that arbitration proceedings have not yet been commenced.