off-board trading
noun[U]
STOCK MARKET,FINANCEukustheactivityofbuyingandsellingsharesthat arenormallytradedon theNew York Stock Exchange,directlywithothersratherthan using theexchange:
While NYSEvolumehas beenflat, thegrowthof off-boardtradinghasboostedthetotalnumberoftrades.
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over-the-counter