Nadex Adjusts Strike Width on Trade Date June 9, 2017

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(d)(2)(iv), Nadex is providing notice that due to volatility in the underlying markets upon which the Nadex contracts are based as a result of the UK Parliament election, Nadex adjusted the strike width for its Intraday 5-Minute GBP/USD Binary contracts on trade date June 9, 2017. The strike with for the Intraday 5-Minute GBP/USD Binary contracts was increased from 0.0002 to 0.0004 beginning with the 6:25pm ET expiration on trade date June 9, 2017, and continued through the 7:25pm ET expiration. The strike width again increased to 0.0006 beginning with the 7:30pm ET expiration through the 10:50pm ET expiration. The width decreased to 0.0004 from the 10:55pm ET expiration through the 8:05am ET expiration, and then returned to its normal listing.