Locked and crossed markets on NASDAQ and the NYSE

Andriy V. Shkilko, Bonnie F. Van Ness and Robert A. Van Ness

Journal of Financial Markets, 2008, vol. 11, issue 3, 308-337

Abstract: The NBBO for an average active stock is non-positive (locked or crossed) 10.58% and 4.05% of the time on, respectively, the NASDAQ and the NYSE inter-markets. Locks and crosses are frequent fleeting events that usually accompany significant price changes. Non-positive NBBOs arise because of (i) simultaneous and (ii) tardy quote updates, (iii) electronically unreachable quotes, (iv) reluctance to trade against autoquotes, (v) order transit considerations, and (vi) ECN liquidity attraction efforts. Most locks and crosses result from competitive trading practices in contemporary fragmented markets.

Date: 2008
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