There is no central ‘exchange’ in the OTC market; therefore, broker-dealers must communicate and trade directly with other broker-dealers. In order to notify other broker-dealers that they are willing to trade a security at a particular price, broker-dealers post their ‘quotes’ on an Inter-dealer Quotation system such as OTC Link. The aggregation and ranking of these quotes defines the ‘market’ for a security. The highest ‘bid’ (purchase price) and lowest ‘ask or offer’ (sale price) becomes the ‘inside market’ or NBBO – the National Best Bid and Offer.
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