Learning tool 08 · Portfolio risk

Value at Risk book

See how ten physical and paper positions combine after correlation and hedge netting—and why the example book still exceeds its one-day VaR policy limit of USD 100,000.

Read the VaR framework in the book
Illustrative 95% one-day VaR

A ten-position trading book

Switch positions on or off and change their exposure. MATIF and FFA positions can reduce related physical risk, but the starting book still breaches its USD 100,000 policy limit.

Portfolio VaR$134,060Policy limit breached
Policy VaR limit$100,000Risk threshold, not a maximum loss
Excess risk$34,060134% limit utilisation
Gross standalone VaR$468,003Before correlations and netting
Limit
Wheat cash+$9MNetted factor VaR $177.7K
MATIF-$5MNetted factor VaR $90.5K
FFA+$1.5MNetted factor VaR $61.7K
Freight sale-$3MNetted factor VaR $138.2K
Advanced detailEdit the ten-position bookOptional · 10 of 10 positions included

Read portfolio effect before switching a line off. A positive number adds to current VaR. A negative number is providing hedge or diversification benefit, so removing it can make risk rise. A 95% one-day VaR is a modelled threshold, not the worst possible loss.

In bookPositionRisk factorDirectionExposure, USDmDaily volatilityStandalone VaRPortfolio effect
Long Constanta wheatWheat cashLong1.2%$59,220+$23,716
Long Polish wheatWheat cashLong1.2%$39,480+$18,611
Long French wheatWheat cashLong1.2%$39,480+$18,611
Long Black Sea wheatWheat cashLong1.2%$39,480+$18,611
Short MATIF MarchMATIFShort1.1%$45,238-$20,317
Short MATIF MayMATIFShort1.1%$45,238-$20,317
Long Supramax FFAFFALong2.5%$30,844-$7,913
Long Panamax FFAFFALong2.5%$30,844-$7,913
Fixed freight sale: DurbanFreight saleShort2.8%$69,090+$17,091
Fixed freight sale: AbidjanFreight saleShort2.8%$69,090+$17,091
Answer explainedWhy does the result move?Open or close the model FAQ
In plain English

This is a transparent parametric teaching model with fixed illustrative volatility and correlation assumptions. It is not the book's historical-simulation route model and must not be used as a production risk number. A 95% VaR is a modelled threshold, not a maximum loss.

The rule behind itVaR95 = 1.645 × √(net factor exposure′ × covariance × net factor exposure)