constructed. Crossover is constructed in a similar way but is composed of a min of 40 and a max of 50 sub-investment grade credits. Also traded are iTraxx Sector indices: NonFin (non-financials), SenFin (senior-financials) and SubFin (sub-financials). The constituents of the indices are changed every six months, a process known as "rolling" the index. The roll dates are March 20 and September 20 each year. For example, Series 13 was launched on March 20, 2010, with a maturity of June 20, 2015 for the 5-year contract. Other maturities for Europe and Crossover are 3 year, 7 year and the 10 year, whilst the NonFin, SenFin and SubFin only trade at maturities of 5 and 10 years. Trading in iTraxx CDS contracts predominantly occurs in the over-the-counter (OTC) market. However, as of February 25, 2013, the IntercontinentalExchange (ICE) began offering central clearing of iTraxx products. Furthermore, as part of the Dodd-Frank financial overhaul, the Commodity Futures Trading Commission has mandated central clearing of most iTraxx products for entities subject to its jurisdiction beginning April 25, 2013, though the relevant compliance date depends on the size of the entity trading iTraxx products. References External links Markit NYSE Euronext CDS Eurex official site Weekly Tradable Fixing Credit risk Derivatives (finance) Swaps (finance)