Exposure Limits
Learn how gross, net, directional, asset, sector, venue and collateral exposure limits prevent a portfolio from accumulating more risk than individual trade sizing suggests.
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Exposure limits cap how much of the portfolio can depend on a single direction, asset, sector, venue or risk factor, recognising that many individually acceptable trades can combine into one oversized portfolio bet.
Learning objectives
- Distinguish gross and net exposure.
- Aggregate positions by asset, sector, venue and common risk factor.
- Design layered limits that sit above individual trade risk rules.
What it is
Gross exposure adds the absolute value of long and short positions. Net exposure offsets them. A portfolio long £150,000 and short £100,000 has £250,000 gross and £50,000 net long exposure.
Neither number is sufficient alone. Net exposure approximates directional sensitivity under simple assumptions; gross exposure captures leverage, turnover, financing and the amount of capital dependent on positions functioning as expected.
Exposure can also be grouped by underlying, sector, stablecoin collateral, exchange, blockchain or strategy. In crypto, these non-price dimensions are often as important as nominal asset names.
How it works
Two different altcoins can share the same beta to BTC and therefore behave like one concentrated directional position during a market shock.
A long spot/short perpetual carry trade may have near-zero net delta but still expose the account to both legs, margin, exchange solvency and funding changes.
Venue exposure includes cash, collateral, unrealised P&L and assets that cannot be withdrawn immediately. A counterparty cap may therefore be tighter than a market-risk cap.
Exposure limits should work hierarchically: per position, per asset, per sector/factor, per venue and portfolio gross/net. The most restrictive applicable limit controls.
How to analyse and apply it
| Check | Why it matters | What to verify |
|---|---|---|
| Gross exposure | Shows total deployed leverage. | Include both long and short absolute notionals. |
| Net exposure | Shows first-order directional tilt. | Delta-adjust derivatives where relevant. |
| Factor/sector exposure | Finds hidden common drivers. | Group correlated assets and strategies. |
| Venue/collateral exposure | Captures operational concentration. | Include cash, margin and unrealised claims. |
Risk rules should be written before a live position is opened and evaluated across many trades or scenarios. A control that is changed only after losses appear is discretionary damage control, not a repeatable risk system.
Worked example and thought exercise
A £100,000 portfolio holds £80,000 BTC long, £50,000 ETH long and £40,000 altcoin shorts. Gross exposure is £170,000. Simple net is £90,000 long. If the shorts are high-beta assets that rise faster in a rally, actual factor exposure may differ from the simple net figure.
A policy may cap gross at 200% of equity, net directional at ±75%, any single asset at 60%, and any venue at 35%. One new trade must satisfy all four.
Thought exercise: why can a zero-net long/short portfolio still suffer a very large loss?
Common mistakes and practical workflow
- Looking only at net exposure and ignoring gross leverage.
- Treating different tickers as independent risk factors.
- Excluding cash or collateral held on an exchange from venue exposure.
- Allowing many small positions to bypass an aggregate asset or sector cap.
Practical workflow
- Calculate gross and delta-adjusted net exposure.
- Aggregate positions by underlying and common factor.
- Aggregate collateral and claims by venue/network/stablecoin.
- Compare all totals with predefined limits.
- Reject or resize any trade that breaches the tightest applicable cap.
✅ Knowledge checkpoint
- What is gross exposure?
- How can net exposure differ from gross exposure?
- Why can different altcoins still represent one factor exposure?
- What belongs in a venue-exposure calculation besides open positions?
FAQs
❓ Is net exposure enough for a hedged book?
No. Basis, correlation, counterparty and liquidity risks can remain large even when net delta is near zero.
❓ Should spot holdings count toward exposure?
Yes. Exposure limits should include all economically relevant positions, not only leveraged derivatives.
❓ How do options fit?
Use delta or other risk sensitivities for directional measures, while also tracking notional and nonlinear gamma/vega risks separately.
❓ Can limits change with market conditions?
Yes. Sensible systems may tighten them during high volatility, poor liquidity, drawdowns or venue stress.
📋 Summary
Exposure limits prevent portfolio risk from escaping the boundaries of individual trade sizing. Monitoring gross, net, factor and venue concentrations together reveals leverage and dependencies that a simple position-by-position view can miss.
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