By Jacob Bunge 

One of the last vestiges of the swashbuckling era of commodities floor trading is fading away.

CME Group Inc., the world's largest futures-market operator, said Wednesday it is closing most of its futures trading pits in Chicago and New York as electronic trading has become the overwhelmingly dominant way futures contracts are bought and sold. The move, which will take effect by July 2, brings to a close nearly 150 years of barking and jostling over the price of grain, oil and interest-rate contracts.

"The time has finally come," said Leo Melamed, chairman emeritus at CME and a former chairman who helped the exchange develop its electronic trading platform in the late 1980s. "It's a historic moment, but one that I think was always out there and was going to happen."

Some pits will remain at the CME, including for the S&P 500 futures market and for options on futures, which have been slower to migrate to screens due to the complexity of arranging trades that incorporate multiple options contracts. CBOE Holdings Inc., also based in Chicago, still operates a floor for its S&P 500 index option contracts.

But few of the biggest exchanges in the world still have trading floors. Some have kept them going primarily for ancillary benefits. NYSE Group, a unit of Intercontinental Exchange Inc., has trading floors for stocks and options inside its historic building in lower Manhattan. However, one of the reasons ICE has kept the floor is because companies issuing shares to the public enjoy the marketing experience of ringing the bell above the hubbub of traders.

The Chicago Board of Trade, which CME bought in 2007, opened its trademark octagonal trading pit in 1870. The Chicago pits gained a central position in the global agricultural commodities trade, its bellowing traders helping set world benchmark prices for corn, cattle and pork bellies. The pits later expanded into contracts based on currencies, interest rates and stock indexes.

Business in the pits peaked long ago, with floor traders, clerks and related staff dwindling to about 1,200 in Chicago in recent years from a high of more than 10,000 in the 1990s. CME last year traded 31 million futures contracts on its floors in Chicago and in New York, where it runs the New York Mercantile Exchange. On its electronic Globex platform, 2.66 billion futures contracts changed hands.

The futures pits had lost their dynamism in recent years, but they were once a frenetic hub of activity that was seen as a symbol of capitalism. The cavernous room roared to life at the start of the trading day.

"It may have looked crazy, but it was a highly organized system where people transacted billions of dollars' worth of trades with a gesture, shout and a handshake," said John Lothian, a former futures trader.

The CME decision is likely to renew a debate about the reliability of purely electronic markets. The existence of skilled floor traders was useful last April when a technical glitch at CME halted electronic trading in 31 commodities, including corn. Floor traders scrambled to fill orders using hand gestures and shouts.

To help floor traders with the transition, CME said in a statement it would "make booth space available to those who want to trade electronically following the closure of the open outcry futures pits."

Traders in Chicago said Wednesday they weren't surprised by CME's move, given the steady flow of brokers and clerks away from the exchange floor over the past decade. Electronic systems have made trading cheaper, faster and more transparent to investors.

"It shouldn't come as a surprise that this day was coming, given the small amount of liquidity the floor markets have," said Glenn Holland, a managing director with CQ Solutions in Chicago who trades interest-rate futures and options from the CME floor. He said he plans to continue trading options contracts there.

"It's definitely the end of an era," he said.

Write to Jacob Bunge at jacob.bunge@wsj.com

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