6437. Prohibition from Locking or Crossing Quotations in OTC Equity Securities
(a) Members must implement policies and procedures that reasonably avoid displaying, or engaging in a pattern or practice of displaying, locking or crossing quotations in any OTC Equity Security.
(b) For purposes of this Rule, the following definitions shall apply:
(1) The term "crossing quotation" shall mean the display of a bid for an OTC Equity Security at a price that is higher than the displayed price of an offer