Nadex Amends Strike Width for Silver Variable Payout Contracts, Dollar Multiplier for US 500 Variable Payout Contracts, and duplicate Crude Oil Binary Contract

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(a), Nadex amends an error in the strike widths for the Silver Variable Payout Contracts, as defined in Rule 12.9, and the dollar multiplier for the US 500 Variable Payout Contracts, as defined in Rule 12.88. Additionally, Nadex amends a duplication of the 10am-12pm intraday Crude Oil Binary Contract, as defined in Rule 12.20. These rule amendments are effect for the start of business on trading day Monday, June 28, 2010.