Nadex Amends Rules for Position Limits for Market Makers in the Japan 225, Korea 200, Copper, Gold, Silver, Crude Oil, Natural Gas, FTSE 100 and Germany 30 Binary Contracts, Delists the Last Expiring Copper, FTSE 100, and Germany 30 Intraday Binary Contra

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulation §40.6(a), Nadex amends its Rule 4.4 pertaining to position limits for approved market makers engaged in bona fide market-making activity in the Japan 225, Korea 200, Copper, Gold, Silver, Crude Oil, Natural Gas, FTSE 100 and Germany 30 Binary Contracts. Nadex also intends to delist its Copper Intraday Binary Contract expiring at 1:00PM ET and its FTSE 100® and Germany 30 Intraday Binary Contracts expiring at 4:00PM ET. Additionally, Nadex has made corrections or clarifications to the language in Rules 5.5(b)(iii), 12.3(n), 12.5(k), (l), (n), and 12.7(n). These rule amendments will be effective for the start of business on trading day Monday, May 2, 2011.