NYSE Euronext ( NYX) said third-quarter net income fell 33% to $174 million, or 66 cents a share, from $258 million, or 97 cents a share, a year earlier. On an adjusted basis, excluding merger expenses and other nonrecurring items, earnings in the quarter were $192 million, or 72 cents a share, compared with adjusted earnings of $201 million, or 75 cents a share a year earlier. Third-quarter earnings met the estimates of analysts polled by Thomson Reuters. NYSE Euronext, the operator of the New York Stock Exchange and Euronext and Liffe exchanges, said revenue in the quarter rose slightly to $1.2 billion from $1.13 billion a year earlier. "Despite turbulent markets and the global financial crisis, NYSE Euronext produced stable revenues in the third quarter and continued to drive down operating expenses," said CEO Duncan Niederauer in a statement Friday. In the company's U.S. cash markets during the third quarter, average daily volume was 3.6 billion shares traded, an increase of 16.8% from a year earlier. It was the most active quarter ever with 231.8 billion shares traded, NYSE Euronext said.