Liquidation cascades explained: how forced selling feeds itself

A liquidation cascade is a chain reaction. Forced closes of leveraged positions move the price, and that move triggers the next set of forced closes. Liquidated longs are sold into the order book. When the book is thin, the selling pushes price down to where other longs are liquidated. Afterwards, the pattern usually shows as a sharp fall in open interest during a fast move.

This guide describes the mechanics. It does not forecast when cascades happen. Examples use illustrative prices.

Start with one liquidation

A leveraged position is liquidated when losses reduce its margin to the maintenance level. The venue’s liquidation engine then closes the position, usually with a market order. For how the liquidation price is set, see leverage, margin and liquidation.

The key point: a liquidated long is closed by selling, and a liquidated short is closed by buying. The trader did not choose the timing. The order arrives regardless of what the book looks like.

How one liquidation becomes many

A cascade needs three things together.

1. Clustered liquidation prices. Many positions opened near the same price, at similar leverage, have liquidation prices near each other.
2. High leverage. The higher the leverage, the closer each liquidation price sits to entry. A small move reaches it. At 20x, a move of under 5% can be enough.
3. A thin book. If few resting orders sit near the price, each forced market order moves price further.

When those line up, the sequence runs like this:

1. Price falls into the first cluster of long liquidation prices.
2. The liquidation engine sends market sells.
3. The sells consume bids and push price lower.
4. Lower price reaches the next cluster.
5. Steps 2 to 4 repeat until the book absorbs the selling or the clusters run out.

Worked example: one step of the chain

The bid side of a BTC book looks like this:

Bid price	Quantity
$57,000.00	1.0 BTC
$56,950.00	1.5 BTC
$56,800.00	2.5 BTC

A group of long positions totalling 5 BTC reaches its liquidation price at $57,000.00. The engine sells 5 BTC at market:

• 1.0 BTC at $57,000.00 = $57,000.00
• 1.5 BTC at $56,950.00 = $85,425.00
• 2.5 BTC at $56,800.00 = $142,000.00

Total: $57,000.00 + $85,425.00 + $142,000.00 = $284,425.00 Average fill: $284,425.00 ÷ 5 = $56,885.00

The last trade is now $56,800.00, a fall of $200.00 from where the liquidations began. Another group of longs may have liquidation prices at or above $56,800.00. If so, it is now triggered too, and the process starts again against the remaining bids.

On most venues liquidation is checked against mark price, not last price. A move on one venue’s book feeds the next step only as far as it shifts the mark price. When many venues move together, it does. For the difference, see mark price vs last price vs index price.

Why thin books matter so much

The same 5 BTC sold into a deep book, say 20 BTC bid at $57,000.00, would fill entirely at one price. Price would not move, and no second group would be triggered.

Depth is what breaks the chain. Depth can thin out quickly in fast markets, as market makers widen quotes or pull orders. That is when a modest liquidation can move price furthest. For how to read depth, see how to read an order book.

The mirror image: short squeezes

The same mechanism runs upward.

1. Price rises into a cluster of short liquidation prices.
2. The engine closes those shorts by buying at market.
3. The buying lifts price into the next cluster.

This is often called a short squeeze. The arithmetic is the same, with asks in place of bids.

Reading it in open interest

Open interest counts open contracts. Every liquidation closes a position, so a cascade usually removes open interest quickly.

Example. Over one hour:

• Open interest falls from 10,000 BTC to 9,200 BTC, a drop of 800 BTC, or 800 ÷ 10,000 = 8.0%.
• Price falls from $60,000.00 to $56,800.00.

In USD terms, open interest goes from 10,000 × $60,000.00 = $600,000,000.00 to 9,200 × $56,800.00 = $522,560,000.00. That is a fall of about 12.9%. Part of it is closed positions and part is the lower price. Measuring open interest in contracts or coins separates the two.

What the combination describes:

Price	Open interest	Funding	What it often reflects
Falls sharply	Falls sharply	Drops toward neutral or negative	Long positions closed, many by force
Rises sharply	Falls sharply	Rises toward neutral or positive	Short positions closed, many by force
Moves sharply	Flat or rising	Little change	New positions opening; not mainly liquidations

Some venues publish liquidation data directly. Where they do, it confirms what open interest only suggests. Funding often resets after a cascade, because the crowded side has been cleared out; see perpetual futures funding rates, explained.

All of this describes positioning after the fact. None of it says what price does next.

What venues do when liquidations overshoot

In a fast cascade, a position can close at a worse price than its liquidation price. The shortfall has to be covered somehow. Venues commonly use some of the following, and the details vary by venue:

• An insurance fund, built up from past liquidations that closed at better prices, which absorbs the shortfall.
• Auto-deleveraging (ADL), which reduces profitable opposing positions when the fund is not enough.
• Mark-price liquidation, which reduces cascades driven by one venue’s wicks.
• Partial liquidation, which closes part of a large position first instead of all at once.

Check your venue’s liquidation and ADL rules.

Common misreadings

• Treating a cascade as news-driven. The first move may have a cause. The later steps are often mechanical.
• Reading open interest in USD only. A falling price lowers USD open interest without any position closing.
• Assuming a cascade means a bottom or top. It means a cluster of positions was cleared. That is all.
• Assuming a stop-loss avoids the chain. A stop-market can fill far below its trigger in a cascade. See take-profit and stop-loss orders on perpetuals.

Related

For how margin mode affects what a liquidation takes from an account, read isolated vs cross margin. More guides are in trading concepts.