How should risk managers think about event risk — the kind that standard models completely miss?

Event risk — sudden, severe market dislocations driven by specific catalysts — sits at the boundary of what quantitative models can capture. Standard VaR and even ES are based on historical patterns that may not include the next crisis.

Types of Event Risk:

1. Macro events: Financial crises, sovereign defaults, central bank surprises
2. Geopolitical: Wars, sanctions, terrorism
3. Policy events: Currency de-pegging, capital controls, regulatory changes
4. Market structure: Flash crashes, liquidity evaporation, circuit breakers
5. Natural disasters: Pandemics, earthquakes, climate events

Why Standard Models Fail:

Practical Approaches to Event Risk:

1. Stress Testing:

Design specific scenarios based on plausible events:

• 'What if the Fed raises rates by 200bps unexpectedly?'
• 'What if oil spikes to $200/barrel due to Middle East conflict?'
• 'What if China devalues the yuan by 20%?'

Apply these scenarios to the current portfolio and calculate losses WITHOUT relying on historical correlations.

2. Reverse Stress Testing:

Start from the outcome: 'What event could cause us to lose more than $X or breach our capital ratios?' Then assess the plausibility of those scenarios.

3. Scenario Analysis:

Use historical events as templates but adjust for current positioning:

• 2008 credit crisis: Widen credit spreads 500bps, equity -40%, vol to 80
• 2020 COVID: All assets -30% simultaneously, Treasury rally
• 2015 Swiss franc: Currency gaps 30%, vol explodes

4. Position Limits and Circuit Breakers:

Limit exposure to single events:

• Maximum loss per country/sector/asset class
• Stop-loss orders (though they may not execute during gaps)
• Tail risk hedges (deep OTM puts, variance swaps)

FRM Key Points:

• Event risk cannot be fully quantified — judgment and experience matter
• Stress testing complements VaR/ES; it doesn't replace them
• The Basel framework requires both regular backtesting AND stress testing
• Concentration risk amplifies event risk — diversification is the first defense
• Risk culture matters: firms that dismiss 'impossible' scenarios are most vulnerable
• The biggest risk is always the one you haven't thought of

Study event risk and stress testing in our FRM Part II Market Risk module.