Market Maker

What Is a Market Maker?

A market maker is a participant in a financial market that stands ready to buy and sell a particular asset at publicly quoted prices on a regular and continuous basis. Under the U.S. Securities Exchange Act of 1934, a market maker is defined as any dealer who "holds himself out as being willing to buy and sell such security for his own account on a regular or continuous basis." By posting both a bid price (what they will pay to buy) and an ask price (what they will accept to sell), market makers ensure that anyone looking to trade can do so immediately, rather than waiting for another trader with the opposite intent.

Market makers serve a critical function in any market: liquidity provision. Without them, buyers might wait hours or days to find a seller at a reasonable price. In return for this service, market makers capture the spread between their bid and ask prices. In traditional equities, firms like Citadel Securities and Virtu Financial make markets on exchanges such as the NYSE and Nasdaq. In crypto, firms like Wintermute and GSR fill the same role on centralized exchanges, while AMMs automate the process on-chain.

How It Works

Market making revolves around three core mechanics: quoting, spread capture, and inventory management.

Quoting and Spread Capture

A market maker continuously places limit orders on both sides of an order book. For example, if Bitcoin is trading around $100,000, a market maker might post a bid at $99,980 and an ask at $100,020. When a buyer hits the ask and a seller hits the bid, the market maker earns the $40 spread on that pair of trades. Across thousands of transactions per day, this adds up.

The width of the spread reflects market conditions. In liquid, stable markets, spreads are tight (sometimes fractions of a cent for large-cap equities). In volatile or illiquid markets, spreads widen to compensate for the higher risk of holding inventory during rapid price changes.

Inventory Management

When order flow is imbalanced (more buyers than sellers, or vice versa), a market maker accumulates a directional position. If a market maker keeps buying because sellers are hitting their bid, they end up long on the asset and exposed to downside risk. The Ho and Stoll (1981) model formalized this as the central challenge of market making: adjusting quotes dynamically to attract trades that rebalance inventory.

In practice, market makers shift their quotes to manage exposure. When holding excess inventory, they lower their ask slightly to attract sellers and raise their bid slightly to discourage further buying. This dynamic adjustment keeps their position close to neutral while still capturing spread.

Revenue Sources

Beyond the spread, market makers earn from several additional channels:

• Exchange rebates: many exchanges operate a "maker-taker" fee model, paying rebates to participants who post resting limit orders (makers) and charging fees to those who execute against them (takers)
• Payment for order flow (PFOF): in U.S. equities, market makers like Citadel Securities pay retail brokers to route customer orders to them, then profit from internalizing those trades. This practice is banned in the UK and Canada, and the EU will prohibit it starting June 2026.
• Interest income on held inventory and margin collateral

A Simplified Example

The following pseudocode illustrates the core logic of a basic market-making algorithm:

// Simplified market making logic
function updateQuotes(midPrice, inventory, baseSpread) {
  // Widen spread when inventory is imbalanced
  const skew = inventory * 0.001;
  const bid = midPrice - baseSpread / 2 - skew;
  const ask = midPrice + baseSpread / 2 - skew;

  // Post both sides of the book
  placeOrder("BUY", bid, quantity);
  placeOrder("SELL", ask, quantity);
}

// React to fills and rebalance
onFill((side, price) => {
  if (side === "BUY") inventory += quantity;
  if (side === "SELL") inventory -= quantity;
  updateQuotes(getMarketMid(), inventory, baseSpread);
});

Real market-making systems are vastly more complex, incorporating latency optimization, adverse selection models, multi-venue arbitrage, and risk limits. But the core principle remains: quote both sides, capture spread, manage inventory.

Traditional Market Makers vs. AMM Liquidity Providers

In traditional finance and on centralized crypto exchanges, market makers are firms that actively manage order books. On decentralized exchanges, the role is filled by automated market makers: smart contracts that use mathematical formulas to set prices and pool-based liquidity rather than order books.

AMMs democratized liquidity provision: anyone with tokens can become a liquidity provider. However, they introduce unique risks like impermanent loss and are vulnerable to MEV extraction through sandwich attacks. Concentrated liquidity AMMs like CLMMs attempt to bridge the gap, letting LPs focus their capital in specific price ranges, similar to how traditional market makers concentrate quotes near the mid-price.

Major Crypto Market Makers

Several firms dominate crypto market making, providing liquidity across centralized exchanges, DEXs, and OTC markets:

• Wintermute: one of the largest crypto market makers globally, handling over $15 billion in average daily trading volume. Headquartered in London, Wintermute provides liquidity across spot, derivatives, and OTC markets, and has expanded into tokenized assets and prediction markets.
• GSR: founded in 2013, GSR handles billions in trading volume and was valued above $1 billion following a 2026 investment from Standard Chartered. GSR offers market making, OTC trading, and treasury management through its unified institutional platform.
• Cumberland (DRW): the crypto arm of Chicago-based trading firm DRW, Cumberland is a major institutional OTC liquidity provider. The SEC filed a complaint in 2024 alleging unregistered dealing but dropped the case in early 2025.
• Jump Trading: a major traditional trading firm that expanded into crypto but scaled back U.S. operations amid regulatory scrutiny. Its subsidiary Tai Mo Shan paid $123 million to settle SEC allegations related to TerraUSD. As of 2025, Jump has been rebuilding its digital assets operations.

The crypto market-making space has seen significant controversy. Alameda Research, founded by Sam Bankman-Fried, misappropriated billions in FTX customer funds before collapsing in 2022. In 2024, the FBI's "Operation Token Mirrors" used a fake cryptocurrency to expose wash trading services offered by firms like CLS Global and Gotbit, resulting in charges against over 18 individuals.

Market Making on Bitcoin and Lightning

On Bitcoin, market making takes two primary forms: OTC desk trading for large block transactions, and Lightning Network liquidity provision.

OTC Desks

Institutional Bitcoin buyers and sellers use OTC desks to execute large trades without impacting public exchange prices. Firms like Cumberland, Wintermute, and Coinbase Prime facilitate these block trades, sourcing liquidity across their networks to fill orders that would move markets if placed on a public order book.

Lightning Liquidity Providers

On the Lightning Network, routing node operators function as quasi-market makers. They allocate capital to payment channels, earning routing fees for forwarding payments through the network. These fees have two components: a flat base fee per forwarded payment and a proportional fee rate that scales with the payment amount.

Like traditional market makers adjusting quotes, Lightning node operators dynamically adjust their fee rates based on channel balance. When inbound liquidity is abundant, they lower fees to attract routing. When channels are draining in one direction, they raise fees or perform rebalancing operations to restore capacity. Monthly Lightning transaction volume reached $1.1 billion by late 2025, with network capacity hitting a record 5,637 BTC.

Lightning Service Providers (LSPs) formalize this role, offering liquidity services and just-in-time channels that ensure users can receive payments without managing their own channel capacity. For a deeper look at how Lightning liquidity works, see the research article on Lightning Network liquidity.

Why It Matters

Market makers are the backbone of liquid, functioning markets. Without them, every trade would require finding a specific counterparty willing to trade at the exact same time, price, and size. This would make markets slow, expensive, and impractical for most participants.

In the crypto ecosystem, market makers serve an additional role: they bridge the gap between centralized and decentralized infrastructure. Professional market makers provide the deep liquidity that institutional traders require on centralized exchanges, while AMM liquidity providers enable permissionless trading on-chain. Together, they create the connected liquidity landscape that makes stablecoin payment rails, atomic swaps, and cross-border remittance corridors viable at scale. For Bitcoin Layer 2 networks like Spark, market maker participation and deep liquidity are essential for making fast, low-cost payments practical for everyday use.

Risks and Considerations

Inventory Risk

When order flow is one-sided, market makers accumulate unwanted positions. A sudden price drop while holding excess inventory can produce significant losses. Crypto markets, which trade 24/7 and can move 10% or more in hours, amplify this risk compared to traditional markets with trading halts and circuit breakers.

Adverse Selection

Market makers face the constant risk of trading against informed counterparties who know something they do not. When an insider or sophisticated algorithm trades against a market maker's quote just before a price move, the market maker absorbs a loss. The Glosten-Milgrom (1985) model showed that the bid-ask spread exists partly as compensation for this adverse selection risk.

Counterparty and Platform Risk

Crypto market makers must hold assets on exchanges to provide liquidity, exposing them to exchange failures. The collapse of FTX in 2022 demonstrated this risk: multiple market makers had funds trapped on the platform. This is one reason why self-custodial solutions and transparent settlement matter for the industry.

Regulatory Uncertainty

In February 2024, the SEC expanded the definition of "dealer" to capture firms that provide liquidity as a regular business but were not previously registered, targeting proprietary trading firms and certain private funds. Crypto market makers face ongoing uncertainty about whether their activities require broker-dealer registration, particularly as the SEC and FINRA continue to develop frameworks for digital asset markets.

Market Manipulation Risks

The line between legitimate market making and manipulation can be thin in unregulated markets. On-chain analysis and exchange surveillance have revealed instances of wash trading, where market makers trade with themselves to create the illusion of volume, and spoofing, where large orders are placed and canceled to manipulate prices. These practices undermine market integrity and have led to enforcement actions by both the SEC and DOJ.

This glossary entry is for informational purposes only and does not constitute financial or investment advice. Always do your own research before using any protocol or technology.