Stress-testing guide library
Start with the question, then examine the assumptions, exposures and reporting decisions.
What Is Portfolio Stress Testing?
Understand conditional portfolio losses, exposure mapping, valuation horizons, and the limits of a stress-test result.
Historical Versus Hypothetical Stress Scenarios
Choose between historical factor replays, constructed scenarios, and transparent hybrids without confusing them with portfolio backtests.
How to Define Scenario Severity
Separate shock size, joint plausibility, duration, and portfolio impact when building a transparent severity ladder.
Reverse Stress Testing a Portfolio
Start with a defined loss or liquidity threshold and investigate the combinations of shocks that could reach it.
Designing Coherent Portfolio Stress Scenarios
Connect an economic narrative to consistent factor shocks, horizons, and valuation channels without counting the same effect twice.
Designing Equity Shocks for a Portfolio
Build equity stresses with market, sector, and issuer components while controlling overlap, beta uncertainty, and nonlinear exposures.
Stress Testing Interest-Rate Exposure
Translate parallel and nonparallel yield shocks into portfolio value changes while distinguishing duration, convexity, and cash-flow risk.
Stress Testing Credit-Spread Exposure
Separate spread repricing, benchmark-rate effects, migration, and default while preserving consistent recovery and valuation assumptions.
Stress Testing Currency Exposure
Translate foreign assets, liabilities, and hedges consistently while preserving quotation direction and the interaction with local returns.
Finding Concentration Risk Behind Portfolio Labels
Look through funds, aggregate connected exposures, and distinguish capital weights from conditional loss concentrations.
Mapping Portfolio Holdings to Risk Factors
Create an auditable bridge from securities and contracts to signed factor exposures, consistent units, and reconciled scenario results.
Coverage and Missing Positions in a Stress Test
Measure what a stress calculation includes, expose unsupported holdings, and interpret partial losses without silently treating missing risk as zero.
When diversification changes under stress
Read correlation assumptions, diagnose disappearing offsets, and distinguish a covariance sensitivity from a specified scenario loss.
Reading exposures that change as markets move
Recognize where delta-based estimates fail, distinguish payoff diagrams from valuation, and review nonlinear positions under joint shocks.
Where duration and convexity stop explaining the loss
Audit rate-shock units, duration conventions, curve shape, embedded options, and the gap between approximations and bond revaluation.
Reconcile local performance with reporting-currency loss
Translate foreign holdings consistently, preserve the asset-currency interaction, and distinguish economic hedges from settlement cash.
A market loss is not the same as a cash shortfall
Read valuation and cash-flow stress together without double counting losses, sale proceeds, delayed receipts, or financing capacity.
Read margin demands as obligations with deadlines
Distinguish variation margin, incremental initial margin, collateral eligibility, and cash availability when reviewing a stress scenario.
Separate collateral haircuts from liquidation discounts
Calculate stressed borrowing capacity, identify collateral shortfalls, and avoid confusing financing haircuts with realized sale losses.
Read the stress report before accepting its headline
Audit scope, coverage, sign conventions, denominators, loss bridges, and limitations before interpreting a portfolio stress total.
Explain a scenario loss without inventing a unique cause
Reconcile position and factor contributions, expose interactions and ordering choices, and distinguish attribution from causal explanation.
Stress testing and VaR answer different questions
Distinguish a modeled loss quantile from a conditional scenario result, interpret expected shortfall, and compare risk measures consistently.
Challenge the model, not just its arithmetic
Separate implementation tests from economic validation, construct informative challengers, and document unresolved limitations and permitted uses.
Keep stress-report revisions explainable and reproducible
Assign ownership, preserve report versions, bridge changed results, and prevent corrections or assumption changes from rewriting the record.
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