 CDX indices contain North American and Emerging Market companies and are administered by CDS Index Company (CDSIndexCo) and marketed by Markit Group Limited, and iTraxx indices contain companies from the rest of the world and are managed by the International Index Company (IIC), also owned by Markit.A new series of CDS indices is issued every six months by Markit.Running up to the announcement of each series a group of investment banks is polled to determine the credit entities that will form the constituents of the new issue.