The Commodity Futures Trading Commission has rejected a request by two trade groups to delay its implementation of position limits aimed at curtailing bets in the commodities markets, according to two people familiar with the matter.

The two groups, the Securities Industry and Financial Markets Association and the International Swaps and Derivatives Association, made the request in joint lawsuits against the CFTC filed last month. The CFTC voted down the request by a vote of 3-to-2, these people said, through a process known as seriatim that was finalized Tuesday.

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