Derivatives dealers, who fear uncertainty even more than they dislike regulation, are becoming increasingly worried about the void atop the Commodity Futures Trading Commission created by the resignation of chairwoman Mary Schapiro.

Although several names have been mentioned as potential successors to Ms. Schapiro, who resigned Dec. 6 to take a post at the National Association of Securities Dealers, the traders now say they are concerned that the budget impasse threatens to delay any confirmation.

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