Wilmington, Del. -- A Delaware corporate-law judge on Friday refused to block the merger of NYSE Euronext (NYX) and Intercontinental Exchange Inc. (ICE), dumping a challenge by shareholders who argued the deal was flawed.

Chancellor Leo Strine turned down a bid for an injunction that would have barred shareholders from voting on the merger, finding critics have little chance of winning if their case goes to a full trial.

"The stockholders have the free ability to choose for themselves this deal," the judge said at a hearing in Delaware's Court of Chancery.

Friday's ruling means ICE's cash-and-stock offer won't run into legal trouble in the state where NYSE is incorporated. Shareholders also sued in New York. The deal value was as high as $10 billion earlier this month, with both stocks hitting 52-week highs.

At Friday's hearing, the judge dismissed suggestions the NYSE board was derelict or uninformed about better potential options for the historic New York exchange. He also declined to find that the proposed pact is safeguarded by excessive deal protections.

The decision to go ahead on the deal came from a board dominated by independent directors.

"This is the kind of board that institutional investors supposedly dream of," Chancellor Strine noted.

Write to Peg Brickley at peg.brickley@dowjones.com

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