(Bloomberg News) Volatility futures linked to emerging-markets stocks begin trading on the Chicago Board Options Exchange Jan. 9, according to a statement from the largest U.S. equity derivatives market.

The futures track the CBOE Emerging Markets ETF Volatility Index, a gauge of options prices and expected price swings for the iShares MSCI Emerging Markets exchange-traded fund. The U.S.-listed ETF tracks 859 companies in 21 nations, from Samsung Electronics Co. to China Mobile Ltd. to OAO Gazprom. Barclays Plc is the lead market maker for the futures, CBOE said.