Market Makers Explainer
A market maker is a broker-dealer that regularly stands ready to buy and sell a particular security at publicly quoted prices. By committing capital and maintaining bids and offers, market makers help investors transact without waiting for a natural counterparty to appear at the same moment.
The difference between the quoted bid and ask helps compensate for inventory risk, adverse selection, operating cost, and competition. Market makers adjust prices and sizes as information, volatility, inventory, and order flow change; they are not required to keep every spread narrow in every condition.
Some market makers quote on exchanges, while wholesale firms execute retail orders routed by brokers. Best-execution duties, order-protection rules, disclosure, and venue requirements shape the process. Price improvement can occur when an order executes better than the displayed quote.
Market making supports liquidity but creates potential conflicts, especially when routing payments or internalization influence where orders go. Investors should evaluate their broker’s execution quality, order type, spread, trade size, and prevailing market conditions rather than assuming commission-free means cost-free.
Market makers quote prices at which they will buy and sell.
That standing interest supports continuous trading.
Inventory, volatility, information, and competition affect the bid-ask gap.
The spread is an implicit trading cost.
Routing, price improvement, speed, and likelihood of execution can differ.
A visible quote is only one part of the result.
Explore more "Explainers"
Discover additional explainers across politics, science, business, technology, and other fields. Each explainer breaks down a complex idea into clear, everyday language—helping you better understand how major concepts, systems, and debates shape the world around us.