Forced Liquidation

Forced liquidation is the closing of a leveraged position by a broker, exchange or lender when the collateral supporting it falls below the required minimum, known as the maintenance margin. The position is sold or bought back at market prices without the holder's agreement, and the proceeds are used to repay what is owed. The aim is to stop losses from exceeding the collateral.

Liquidation is usually the last step after a margin call: the holder is asked to add funds, and if they do not, or if prices move too fast, the position is closed. It applies to stock bought on margin, exchange-traded derivatives, crypto perpetual futures and loans in decentralized finance (DeFi). It differs from a voluntary sale and from bankruptcy liquidation, in which a whole company is wound up.

Think of buying a car with a small down payment and a large loan. If the car's value falls below what you owe, the lender worries that selling it would not cover the loan. With a car, they might wait. With a trading account, the lender does not wait: once your own money in the position has shrunk to a small cushion, it sells the asset immediately, pays itself back and returns whatever is left.

The bigger the loan compared with your down payment, the smaller the price drop needed to trigger that sale. That is why a trader using very high leverage can be closed out by a move of only a few percent, even if the price later recovers.

A trader puts up initial margin to open a position and must keep equity above the maintenance margin rate. For a simple isolated long position, ignoring fees and funding, the liquidation price is approximately:

• $P_{\text{liq}}$ is the price at which the position is closed.
• $P_{\text{entry}}$ is the price at which the position was opened.
• $L$ is the leverage, the position size divided by the trader's margin.
• $m$ is the maintenance margin rate, as a decimal.

For example, a trader buys Bitcoin perpetuals at 100,000 dollars with 10 times leverage on a venue with a 0.5\% maintenance rate. The liquidation price is $100{,}000 \times (1 - 0.1 + 0.005) = 90{,}500$ dollars. A fall of 9.5\% wipes out most of the margin and triggers closure. At 50 times leverage the same formula gives $100{,}000 \times (1 - 0.02 + 0.005) = 98{,}500$, a fall of only 1.5\%. Exchanges usually use a mark price drawn from several spot venues, rather than their own last trade, to decide when the threshold is crossed.

• Brokers and banks. In US securities accounts, FINRA Rule 4210 sets minimum maintenance margin, and broker-dealers may sell a customer's securities without notice when equity falls short.
• Futures clearing. A clearing member that cannot collect variation margin from a client closes the client's positions; if a member itself fails, the central counterparty (CCP) runs a default process using margin and default funds.
• Crypto exchanges. Automated engines close positions on the order book. If the sale fetches less than the debt, an insurance fund absorbs the gap, and if that is not enough, auto-deleveraging closes profitable opposing positions.
• DeFi lending. When a loan's collateral ratio falls below the protocol's threshold, anyone can repay part of the debt and receive the collateral at a discount.

Forced selling pushes prices down, which pushes other leveraged positions toward their own liquidation prices, which forces more selling. Such cascades are a known feature of markets with high leverage and thin liquidity. The largest on record in crypto came on 10 and 11 October 2025, after the US president announced a 100\% tariff on Chinese imports: data aggregators counted about 19 billion dollars of liquidated positions across exchanges in roughly a day, mostly longs, affecting around 1.6 million accounts. Several venues, including Hyperliquid, used auto-deleveraging during the episode.

Traditional markets have seen the same pattern. When the family office Archegos Capital Management failed to meet margin calls in March 2021, its prime brokers sold large blocks of shares, and Credit Suisse reported a loss of about 5.5 billion dollars. Funding payments on perpetuals, measured by the funding rate, can also erode margin and bring a position closer to liquidation.

Critics argue that offering very high leverage to retail traders makes liquidation the expected outcome for many, and that exchanges profit from the fees and liquidation penalties. Disputes also arise when venues use prices that briefly diverge from wider markets. For holders, the standard defences are lower leverage, keeping spare collateral, using stop orders and hedging, and understanding that the mark-to-market price used by the venue may differ from the last traded price.

• FINRA Rule 4210: Margin Requirements
• Commodity Futures Trading Commission
• Faisal Khan: What a Derivative Really Is