By Kelsey Gee 

CHICAGO--Exchange operator CME Group Inc. unveiled plans Friday to sharply reduce electronic-trading hours for its livestock-futures contracts, responding to concerns about light trading and volatility in some overnight hours.

The CME said the changes, which on Oct. 27 would end trading that occurs in evening hours and overnight in the U.S., came after it consulted livestock traders, producers and other market participants. The plans are subject to a review by the U.S. Commodity Futures Trading Commission.

"We believe this change will result in deeper and more liquid markets to serve [customers'] risk-management needs," said Tim Andriesen, managing director for agricultural commodities and alternative investments for CME.

CME, the world's largest futures-exchange operator in terms of trading activity, maintains the main U.S. market for trading contracts reflecting anticipated prices for cattle and hogs. The exchange in recent years has retooled hours and contract specifications for other agricultural products to reflect the wider range of market participants in an increasingly global market for commodities trading, which used to revolve around various industries' business days.

However, more sporadic trading during U.S. overnight hours can at times produce wide swings in prices, some market participants said. The CME last year cut the number of hours its grain futures are traded after expanding them to 21 from 17 the prior year. That move followed criticism that the trading schedule had become bloated--increasing costs for grains traders and creating periods of low-volume, highly volatile trade.

The CME's planned changes are "wonderful news," said Dennis Smith, a commodities broker at Archer Financial Services in Chicago. "There was very little volume overnight, so it'll create a much better trading atmosphere."

Jason Britt, president of Kansas City, Mo., brokerage Central States Commodities, said it was "nutty" to keep livestock markets open for 20 or more hours because relatively little trading in the market occurs outside the U.S. Having lengthy hours for grain trading makes more sense, he said, because the U.S. grain and oilseed markets are affected much more than the U.S. beef and pork markets by fluctuations in export demand and competition from rival exporters.

Open-outcry trading in CME's Chicago-based pits begins each day at 10:05 a.m. ET, ending at 2 p.m. ET, though currently contracts can be traded electronically nearly around the clock, from the time markets open on Monday mornings at 10:05 a.m. ET to 4:55 p.m. ET Friday, with one-hour breaks each day in the late afternoon.

Beginning Oct. 27, electronic trading hours would be from 10:05 a.m. ET to 5 p.m. ET on Monday, and 9 a.m. to 5 p.m. ET Tuesday through Thursday. Friday, trading would stop closer to the end of the pit session at 2:55 p.m. ET.

CME in July began contacting customers of its futures markets to discuss potential changes to the current trading session, after some had expressed concerns about high volatility in the market and, at-times, sporadic trading.

Write to Kelsey Gee at kelsey.gee@wsj.com

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