John Troelstrup, as Equity Receiver for John M. Tobin v. Index Futures Group, Inc., and Jack Carl/312-Futures, Inc.

POSNER, Chief Judge.

We ordered the parties to this appeal from the dismissal of a third-party claim to brief several issues relating both to our jurisdiction and to that of the district court before the merits of the appeal are briefed and argued. We conclude that we have jurisdiction but that the district court did not, at least with respect to the receiver’s claim. We vacate the judgment and direct the district court to dismiss that claim and to reconsider its action in allowing a number of individual investors to join as third-party co-plaintiffs with the receiver.

The Commodity Futures…