Nadex Adds Discretionary Strike Levels and Amends Strike Widths for the Week of August 24, 2015

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(d)(2)(iv), and by the authority granted by Nadex Rules in Chapter 12, due to volatility in the underlying markets upon which the Nadex contracts are based, Nadex added additional strike levels on a discretionary basis in various Daily, Weekly, 2-Hour Intraday, and 20-Minute Intraday US Indices Binary contracts from August 24 through August 28, 2015. Additionally, Nadex added additional strike levels on a discretionary basis in its 5-Minute Intraday Currency Binary Contracts from August 24 through August 28, 2015.

Additionally, due to the volatility in the underlying markets upon which the Nadex contracts are based, the strike widths of the following contracts were increased during the week of August 24, 2015: 5-Minute Intraday AUD/USD, EUR/USD, and GBP/USD Binary contracts width was increased from 0.0003 to 0.0006, and the 5-Minute Intraday USD/JPY Binary contracts width was increased from 0.03 to 0.06 for all expirations occurring 11:45am ET through 3:55pm ET on August 24. The strike width for the 20-Minute Intraday US Indices Binary contracts doubled their original width size for each expiration beginning with the 3:20pm ET expiration on August 24 through the 4:00pm ET expiration on August 27. The strike width for the Daily US 500, US SmallCap 2000, and Wall Street 30 Binary contracts doubled their original width size on August 26 and 27, and the Daily US Tech 100 doubled its original width size from August 26 through expiration on August 28. On August 25 the width size for the 2-Hour Intraday Wall Street 30 increased from 12 to18, the US Tech 100 increased from 4 to 6, the US 500 increased from 1.5 to 2.5, and the US SmallCap 2000 increased from 1.4 to 2 for all expirations occurring from 10am Et through 4pm ET. On August 26 and 27, the width for all 2-Hour Intraday US Indices Binary contracts doubled their original width size for all expirations from 10am ET through 4pm ET.

Nadex returned to its regular listing schedule for all contracts on Monday, August 31, 2015.