Nadex Adds Strikes on a Discretionary Basis for Trade Date December 20, 2011

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, Commission Regulation §40.6(d), and by the authority granted by Nadex Rules in 12.27, 12.31, 12.51, 12.59, 12.61, 12.63, and 12.65, Nadex added additional strike levels on a discretionary basis in its Daily AUD/USD, GBP/USD, Germany 30, US 500, US Tech 100, Wall St 30, and US SmallCap 2000 Binary Contracts for trade date December 20, 2011 due to volatility in the underlying markets on that day. Nadex returned to its regular listing schedule for these contracts on December 21, 2011.