Market Breaks: After Hours Edition As NYSE Says It Is Investigating Pervasive Broken Trades

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DJ NYSE Reviewing Possible Bad After-Hours Trades In Many Stocks

PM Eastern Daylight Time May 02, 2011 (MORE TO FOLLOW) Dow Jones Newswires

U.S. stock exchanges said late Monday they are examining whether after-hours trades in more than 50 stocks should be canceled due to potential errors.

Nasdaq OMX Group Inc. (NDAQ) and NYSE Euronext (NYX) said they were reviewing potentially erroneous trades in 52 stocks executed in after-hours trading between 4:57 p.m. and 5:05 p.m. EDT (2057 and 2105 GMT).

The list of trades under review was dominated by shares of major health-care companies, including insurers Aetna Inc . (AET) and Humana Inc . (HUM), drug makers Bristol-Myers Squibb Co . (BMY), Pfizer Inc . (PFE) and Eli Lilly & Co . (LLY) and the consumer-products giant and Dow component, Johnson & Johnson (JNJ).

Nasdaq officials declined to comment on the broken trades. Officials from NYSE Euronext didn't return requests for comment.
Last week trading in more than 80 securities was halted after a problem in Nasdaq software triggered the release of stale market data.