Nadex Amends the Strike Width for its Weekly Silver Binary Contracts, Corrects a Labeling Error in its Weekly Binary Payout Criterion Description, and Adds Additional Strike Levels on a Discretionary Basis in its Daily Gold Binary Contracts on May 17, 201

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, Commission Regulation §40.6(d)(2)(iv), Nadex amends the strike width on its Weekly Silver Binary Contracts from 100 to 50. Additionally, pursuant to Commission Regulation §40.6(d)(2)(i), Nadex corrects an error in the description of the Payout Criterion for its Agriculture and Index Weekly Binary Contracts, which were mistakenly labeled as "X", rather than "Y". The amendment to the Weekly Silver Binary Contracts strike width, and the correction to the labeling of the Agriculture and Index Weekly Binary Contracts Payout Criterion will be effective May 21, 2012.

Finally, pursuant to Commission Regulation §40.6(d)(2)(iv), and by the authority granted by Nadex Rules in 12.5 and 12.63, Nadex added additional strike levels on a discretionary basis in its Daily Gold Binary Contracts for trade date May 17, 2012 due to volatility in the underlying markets on that day. Nadex returned to the regular listing schedule for these contracts on May 18, 2012. Nadex also added additional strike levels on a discretionary basis in its Daily Tech 100 Binary Contracts for trade date May 18, 2012 due to volatility in the underlying markets on that day. Nadex plans to return to the regular listing schedule for these contracts on May 21, 2012.