Learning notes: Market Maker — Trading Wiki
A market maker posts bid and ask quotes under venue rules to facilitate trading. A quoted spread is not guaranteed profit, and obligations vary by market.
Published by TradeHQ, created by Anuga Weerasinghe. Publisher background and editorial approach. No independent professional review is claimed; any recorded source-check scope appears on the page.
Publisher and editorial transparency
Published by TradeHQ. Site creator: Anuga Weerasinghe. This page has no recorded editorial review date; the About page explains the site's editorial approach.
What Market Maker means
A market maker posts bid and ask quotes under venue rules to facilitate trading. A quoted spread is not guaranteed profit, and obligations vary by market.
In depth
A market maker quotes prices at which it is prepared to buy and sell under applicable venue rules. The ask-minus-bid difference is a quoted spread, not a guaranteed realized profit. Quotes can change; fills, inventory price changes, hedging and operating costs affect results. Obligations and permitted conduct differ between markets. A decentralized automated market maker is a different mechanism that applies a pool pricing rule rather than the same dealer quoting arrangement. Do not infer that a displayed quote will fill an arbitrary quantity or that a market maker always earns money.
TradeHQ does not reproduce order queues or dealer inventory.
Key points
- Quote bid and ask prices under venue rules; liquidity is not guaranteed for every order
- A quoted spread is not guaranteed net profit
- AMMs on decentralized exchanges use algorithms instead of human market makers
Why it matters when you are learning
Compare quoted bid and ask prices with actual executions. Spread changes can have multiple explanations and do not establish a participant’s intent or sophistication.
Worked exercise and its limits
Hypothetical quotes: buy at $10 and sell at $10.02. Buying 100 units then selling them all at that ask earns $2 gross only if both executions occur. Inventory loss, hedging and costs can exceed that spread; a quote is not guaranteed profit.
Educational simulation only — not financial advice. Virtual money; no brokerage transactions. Quotes may be delayed, cached, unavailable or fixed simulator values; generated charts are labelled separately. Practice results do not predict investment outcomes.