The New York Stock Exchange and Euronext won important eleventh-hour endorsements for their planned 10.7 billion euro ($14 billion) tie-up ahead of a key shareholder vote today on the creation of the first trans-Atlantic equities market.

Assurances that the NYSE Group Inc.’s acquisition of Euronext NV will not burden European-listed companies with U.S. red tape appeared to have convinced some influential waverers, although others were not persuaded.