Nadex Amends the Interval Widths and Increases the Number of Strikes Listed in Several Weekly Binary Contracts, Amends the Interval Width in the Daily Natural Gas Binary Contracts, De-Lists its India 50 Variable Payout and Binary Contracts, and Corrects a

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(a), Nadex amends the interval widths and increases the number of strikes listed for the Weekly Copper, Gold, Silver, Crude Oil, Natural Gas, FTSE 100®, Germany 30, Japan 225, Korea 200, US 500, US SmallCap 2000, US Tech 100, and Wall St 30 Binary Contracts, amends the interval width in the Daily Natural Gas Binary Contracts. Nadex also de-lists its India 50 Variable Payout and Binary Contracts and corrects a numbering error caused by a duplicate use of Rule 12.63. These rule amendments will be effective for the start of business on trading day Monday, May 9, 2011.