What Is Over-the-Counter (OTC) Trading?
Over-the-counter refers to any trade negotiated directly between a buyer and a seller rather than routed through a centralized exchange like the NYSE or Nasdaq. Instead of a single order book that matches everyone's orders, OTC markets run on networks of dealers who quote prices at which they are willing to buy and sell, profiting from the bid-ask spread.
The term covers two very different worlds. OTC equities are stocks that do not meet exchange listing standards and trade on platforms run by OTC Markets Group, which tiers companies into OTCQX, OTCQB, and Pink markets based on disclosure quality. Separately, enormous institutional markets for corporate bonds, foreign exchange, and derivatives are OTC by design, with dealers at major banks standing between buyers and sellers.
How OTC Markets Work
In a dealer market, a client who wants to trade contacts one or more dealers, often through electronic platforms or a request-for-quote process, and the dealers respond with prices. Because there is less pre-trade transparency than on an exchange, prices can vary from dealer to dealer, and spreads tend to be wider for less liquid instruments. Corporate bond trades in the US must be reported to FINRA's TRACE system, which adds post-trade transparency.
OTC derivatives changed significantly after the 2008 financial crisis. The Dodd-Frank Act pushed standardized swaps toward central clearing and electronic execution to reduce counterparty risk, since a bilateral OTC contract leaves each side exposed if the other defaults. Customized contracts still trade bilaterally, typically with collateral posted under ISDA agreements to manage that exposure.
Why OTC Markets Matter
By notional value, OTC markets dwarf exchanges. The Bank for International Settlements has estimated the notional amount of outstanding OTC derivatives at over $600 trillion, and nearly all US corporate bond trading is done over the counter. A trader covering credit, rates, or FX operates almost entirely in dealer markets, so understanding quoting conventions and liquidity dynamics is core job knowledge.
On the equity side, OTC stocks carry real hazards for investors. Thin disclosure, low liquidity, and wide spreads make Pink-market names a frequent home for pump-and-dump schemes. Interview answers that distinguish between institutional OTC markets, which are deep and professional, and speculative OTC equities, which are risky, signal genuine market fluency.
