Multiple Cross-Margin Positions: How One Coin's Loss Can Put the Whole Account at Risk
You hold BTC, ETH and SOL in one cross-margin account. Does dividing the holdings among three coins mean the other positions survive if one fails? In cross margin, the liquidation condition applies to the shared account rather than independently to each coin. One position's loss therefore reduces the liquidation cushion for the others.
Cross margin has a shared account-level liquidation condition
Isolated margin risks the collateral allocated to one position; exhausting that protection affects that position. Cross margin uses the account balance as shared collateral for all positions, so risk is assessed jointly. See isolated and cross margin for the basic distinction.
Isolated:
Position A's margin ≤ 0 → A is liquidated.
Position B is unaffected.
Cross:
Account equity ≤ total maintenance margin.
→ One shared assessment.
→ The whole account is in scope.
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Account equity
= balance + all unrealized PnL.
Total maintenance margin
= combined position notional × required rate in this simplified model.
The important point is that unrealized PnL is combined. BTC's unrealized profit can cushion SOL's loss, while SOL's loss reduces the remaining protection for BTC. There are three instruments but one capital cushion.
A numerical example of the shared threshold
Assume a $2,000 cross-margin balance with three longs at 10x leverage and a 0.5% maintenance-margin rate.
BTC long: $6,000 notional.
ETH long: $4,000 notional.
SOL long: $2,000 notional.
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Total notional: $12,000.
Initial margin: 12,000 ÷ 10 = $1,200.
Available balance: 2,000 − 1,200 = $800.
Total maintenance margin:
12,000 × 0.005 = $60.
Liquidation begins when equity falls to the maintenance threshold. Equity is the $2,000 balance plus combined unrealized PnL.
2,000 + combined unrealized PnL ≤ 60.
→ Combined unrealized PnL ≤ −$1,940.
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Relative to $12,000 combined notional:
1,940 ÷ 12,000 = approximately −16.2%.
A common decline of around 16% approaches
the account-wide liquidation threshold.
The −$1,940 capacity is not split into three independent amounts. Any position's losses consume the same combined allowance.
A small position can endanger a larger one
“SOL is only $2,000 notional, so BTC should be fine if it collapses” is a common misunderstanding. The calculation shows otherwise.
SOL −50%:
Unrealized loss −$1,000.
Equity 2,000 − 1,000 = $1,000.
Maintenance margin $60 → still above the threshold.
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Then BTC falls too
BTC −15%:
Unrealized loss −$900.
Combined loss −$1,900.
Equity $100 → close to $60 maintenance.
BTC −16%:
Unrealized loss −$960; combined loss −$1,960.
Equity $40 < $60 → liquidation in this model.
Holding only the $6,000 BTC exposure against a $2,000 balance would have survived −15%; the source illustrates a cushion to roughly −32%. SOL had already consumed half of the shared protection, approximately halving BTC's remaining distance. The source points to available margin as a visible reference; see available margin versus wallet balance for the differences between balance fields.
BTC held alone, in the source's comparison:
Full illustrated cushion $1,940.
→ Survives to around −32%.
SOL first consumes $1,000:
Remaining cushion $940.
→ BTC reaches the threshold near −15.7%.
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Liquidation distance is not fixed.
It changes continuously with other positions' PnL.
More instruments do not automatically mean diversification
Dividing into three positions does not cut risk to one-third. The account still carries $12,000 of combined notional. Exposure, rather than the number of instruments, is the relevant size measure, as explained in notional value.
Cryptocurrencies also tend to move together. When BTC falls, altcoins may fall alongside it and often further. Different names can therefore represent the same directional bet. See crypto correlations and diversification traps.
Correlation near 0, an idealized diversification case:
Losses may offset one another.
Combined losses can accumulate more gradually.
Correlation 0.9, used for the altcoin illustration:
All three fall −16%.
→ Combined loss −$1,920.
→ Similar directional exposure to $12,000 in one instrument.
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Adding more names does not diversify
if they move together.
A conservative starting point is to treat five altcoin positions as one combined notional exposure, then separately establish whether their correlations provide real diversification.
In what order does liquidation happen?
Equity reaching maintenance does not always make every position disappear simultaneously. Many exchanges reduce exposure in stages until the account returns above the required risk threshold.
Step 1:
Cancel unfilled orders.
→ Release their reserved margin.
Step 2:
Reduce positions according to exchange rules,
such as largest notional or greatest risk contribution first.
Step 3:
If still insufficient, continue closing.
→ Potentially liquidate everything.
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You do not choose the order.
A position you wanted to preserve
may close first.
Two further issues apply. First, execution can be worse than the displayed liquidation price; see liquidation price versus bankruptcy price. Second, if extreme movement prevents normal liquidation handling, automatic deleveraging (ADL) can forcibly close profitable positions on the opposite side. Once an account enters the danger zone, control shifts from the trader to the exchange.
Does isolated margin solve the problem?
Using isolated margin for each instrument limits the spread of losses, but introduces a trade-off.
Combined cross margin:
Cushion: full $2,000 balance.
Individual liquidation distance: longer.
Worst case: everything exposed together.
Separate isolated positions:
Cushion: only allocated margin.
Individual liquidation distance: shorter.
Worst case: loss limited to that position's allocation.
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Cross: more shared room, but a joint failure.
Isolated: less room per position, but separate failures.
Isolated positions do not automatically use the rest of the account balance. A small allocation may therefore be liquidated by a fluctuation that shared collateral would have survived. Maintenance-margin tiers affect the threshold; see maintenance margin rates.
Neither method is universally better, but the relevant checks differ. With cross margin, watch total notional and equity above maintenance. With isolated margin, review each position's allocation separately.
Three daily checks for cross margin
1. Total notional
Add all positions rather than viewing them separately.
The multiple of account balance measures actual exposure.
2. Equity minus maintenance margin
This is the remaining shared cushion.
Unrealized losses reduce it in real time.
3. Directional concentration
If every position is long, all are exposed to one market decline,
regardless of the number of coins.
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Before adding a position, ask:
“What will total notional become?”
Adding an instrument does more than open another row. It can reduce the liquidation room of existing positions. Observing how displayed thresholds move after an additional entry makes the shared structure easier to understand.
Summary
2. Unrealized PnL is combined across instruments.
3. Loss capacity is one shared allowance.
4. The $2,000 balance and $12,000 notional example gives −$1,940.
5. A common decline of roughly 16% approaches liquidation in that model.
6. A smaller position's loss can endanger a larger one.
7. Liquidation distances change with PnL.
8. Total notional matters more than the number of names.
9. High correlation weakens diversification.
10. All-long holdings share one direction.
11. Liquidation may proceed through partial reductions.
12. You cannot choose which position closes first.
13. ADL can close profitable opposing positions in extreme conditions.
14. Isolated margin limits spillover but gives each position less cushion.
15. Watch combined notional and equity above maintenance.
16. New exposure can draw existing liquidation thresholds closer.
Adding cross-margin positions divides access to one capital cushion rather than automatically dividing risk. Per-instrument liquidation prices are not independent. When one position loses, the others lose protection too. Begin with the combined amount held, not the number of coins.
Note
The $2,000 balance, $6,000/$4,000/$2,000 notionals, 10x leverage, 0.5% maintenance rate and 0.9 correlation are hypothetical illustrations, not actual exchange parameters or measurements. Equity treatment, maintenance tiers, partial-liquidation sequence, order cancellations, ADL conditions and collateral valuation vary by exchange, product and instrument and may change after notice. Check the exchange's contract specifications and risk-limit tables. This article explains margin mechanics and does not recommend an instrument, leverage level, margin mode or entry or exit timing. Neither cross nor isolated margin prevents losses or guarantees returns. Leveraged trading can lose all principal. Decisions and outcomes are your responsibility.
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