How the haircut scales with the deficit
Same $30M winners' pool and your profit, varying how far the bankrupt loss overshoots the insurance fund. The rate is the deficit divided by the pool — capped at 100% (a full wipe of session profit).
| Uncovered deficit | Haircut rate | Your clawback | You keep |
|---|
Why winning traders can still lose money
When a liquidation closes below bankruptcy price — usually because the book was too thin to exit the whole position cleanly — the exchange is left with a deficit no margin covers. The insurance fund is the first backstop. If it holds, winners are untouched. If it's drained, the venue has two ways to plug the gap: auto-deleveraging (ADL), which force-closes the most profitable, highest-leverage positions at bankruptcy price, or a socialized loss (clawback), which takes a pro-rata slice of every winner's realized profit. Either way, being right on the trade doesn't fully protect you when someone else's blow-up is bigger than the backstop.
The math, and why the pro-rata rate is the whole story
Start with the uncovered deficit. A trader gets liquidated, but the forced exit fills below their bankruptcy price — the price at which their margin is exactly zero — so the position closes at a loss the trader's collateral can't cover. Call that shortfall the bankrupt-position loss. The insurance fund pays first, so the deficit that has to go somewhere else is D = bankrupt loss − insurance fund balance, and only the part above the fund counts (if the fund covers it, D is zero and nobody's profit is touched).
Now the mutualization. The venue spreads D across the pool of traders who made money this session — total winner profit P. The haircut rate is simply D ÷ P, applied uniformly: everyone in profit gives up the same percentage. Your personal clawback is your profit × (D ÷ P), and what you keep is the rest. A $3,000,000 deficit against a $30,000,000 winners' pool is a 10% haircut — an $8,000 profit loses $800. The same $3,000,000 deficit against a thin $6,000,000 pool (a quiet session with few winners) is a 50% haircut on the exact same blow-up. That's the counter-intuitive part: your clawback depends less on how much you made and more on how big the deficit is relative to everyone else's profit — a variable you can't see in real time. When the rate would exceed 100%, profit is wiped entirely and the remainder cascades further (into the next loss-absorption layer), which is where a socialized-loss event turns systemic.