Nadex Amends Rule 1.1(l), Definition of "Expiration Value", and Rule 12.1, Terms that are Uniform Across Contracts

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6, Nadex amends its definition of "Expiration Value" in Rule 1.1(l), and adds to the Terms that are Uniform Across Contracts, set forth in Rule 12.1, a provision to prevent duplicate Payout Criterion levels within the same Class of Contracts and having the same Expiration time. This amendment will be effective for the start of business on trading day Monday, January 31, 2011.