By Lisa Beilfuss 

CME Group Inc., the world's biggest futures-market operator, said second-quarter profit edged slightly higher, lifted by higher trading volume in some products and reigned-in expenses.

The company's results beat Wall Street expectations.

Total average daily volume improved steadily after a slow April, said Chief Executive Terry Duffy, and executives said on a call with analysts that certain products saw heightened activity ahead of a Federal Reserve interest rate increase expected later this year. As the so-called Fed liftoff approaches, volatility may pick up and lift trading volume, say analysts. CME said Thursday that growth across products has continued into July.

The company, which recently closed most of its trading pits in New York and Chicago as traders increasingly execute buy and sell orders electronically, said contract volume grew 6% in the latest quarter. Increases in agricultural commodities, foreign exchange and energy volume--each grew 20% or more--offset declines in interest rate and equity volume.

Trading in interest rate contracts, which make up about half of CME's overall volume, fell 1.3% from a year earlier and 13% from the first quarter. The declines came despite a trifecta of factors--threats of a Greek exit from the eurozone, a potential Puerto Rican default and a sharp selloff in Chinese stock markets--that sent investors back to safe-haven assets.

Equity contract volume, meanwhile, fell 4.1% from a year ago.

The exchange operator said the total average rate per contract rose 3.2% to 77.7 cents, thanks to a higher proportion of total volume coming from commodities products. Commodities products have higher average fees.

CME, which has been working to cut costs, said that in addition to closing trading pits it reduced head count and consolidated data centers. Gross margin during the quarter expanded to 60.4% from 56.3% a year earlier. The company said it now expects $1.3 billion in adjusted expenses this year, $10 million lower than earlier estimated and down 1% from 2014.

At the same time, the exchange operator has been growing its international presence. Volumes grew 22% in Asia and 10% in Europe last quarter, led by metals contracts.

In all, second-quarter profit rose to $265 million from $263.8 million in the year-ago period. On a per-share basis, earnings slipped a penny to 78 cents. Excluding one-time items, per-share profit rose to 95 cents from 77 cents.

Revenue grew 12% to $820 million.

Analysts projected 92 cents in earnings per share on $807.2 million in revenue, according to Thomson Reuters.

Market-data revenue rose 15% to $103 million, higher than some analysts expected, and Chief Financial Officer John Pietrowicz said quarterly market data revenue will hold at about $100 million for the rest of the year. Transaction fee revenue, meanwhile, grew 12% to $682 million.

CME shares, up about 28% over the past year, were little changed in midday trading.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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