Nadex Adds Strikes on a Discretionary Basis in its US Index Binary Contracts for Trade Date Friday, August 5, 2011 Only

291.080511

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(c)(iv), and Nadex Rules 12.59(f)(x), 12.63(f)(x), and 12.65(f)(x), Nadex has added twenty-one additional strike levels on a discretionary basis in each of its US 500, US Tech 100, and Wall Street 30 Daily Binary Contracts for trade date Friday, August 5, 2011 only, due to volatility in the underlying market on that day.

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