What it means
A single loan or a single contract may look small, but a business often has many that point to the same borrower, industry or event. Cumulative exposure adds them up so that the full amount at risk is visible.
Without this view, an organisation can believe it is well diversified (spread across many independent risks) when it is not. Banks use the idea to control lending to one customer or group.
They add up term loans, undrawn credit lines, guarantees and the current value of derivatives with the same counterparty, and compare the total with an internal limit. Regulators also set rules on the size of large exposures relative to a bank's capital.
Insurers use a similar idea for accumulation. If a firm insures many buildings in the same flood zone, one storm could cause claims on all of them at once, so the insurer measures the combined potential loss.
This is what drives limits on how much cover can be sold in a single area. Companies with trade customers apply the concept to credit control.
A supplier may sell to ten subsidiaries of the same group, each within its own credit limit, yet the total owed by the group may be far above what the supplier would accept from a single customer. The credit manager therefore tracks exposure by group, not only by invoice.
Investors apply it to portfolios. Holding many shares in the same sector or the same type of bond adds to the exposure to one risk factor, even if the names are different.
Reporting by theme helps managers stay within their risk appetite. The main nuance is that the exposure shown on paper is not the same as the loss expected.
Collateral, insurance, netting agreements and the likelihood of default all reduce the loss, so risk managers report the gross figure and then adjust it.
In practice
Real-world examples.
Example
A bank's credit committee reviews a request from a property developer for another $2,000,000 loan. The risk team shows that loans to the developer's related companies already total $9,000,000. The committee decides that the new loan would breach its group limit and declines it.
Example
A property insurer sells policies on homes along one stretch of coast. The underwriter adds up the insured values and finds that a single storm could cause $120,000,000 in claims. The insurer buys reinsurance (insurance for insurers) to cap its own loss.
Example
A food wholesaler supplies five restaurants owned by one parent company. Each has a $50,000 credit limit, but the credit manager notices that the group owes $250,000 in total. She asks the parent for a guarantee before releasing further goods.
Formula
Calculation
Cumulative exposure = sum of all individual exposures to the same party or risk.
Suppose a bank lends a corporate group a $4,000,000 term loan, offers an undrawn credit line of $1,500,000, has issued a guarantee of $700,000 and holds a derivative with a current value of $300,000 owed to it. The cumulative exposure is 4,000,000 + 1,500,000 + 700,000 + 300,000 = $6,500,000. If the bank's internal limit for one group is 10% of capital and its capital is $80,000,000, the limit is $8,000,000, so the headroom is 8,000,000 - 6,500,000 = $1,500,000.Case study
Seen in the real world.
This fictional story is illustrative only. Summit Peak Capital is an invented investment firm that holds shares in twelve companies it believes are independent of one another.
During a review, the risk manager discovers that nine of the twelve companies depend heavily on the same overseas supplier and the same shipping route. When she adds up the holdings that are exposed to that route, the combined position is $18,000,000, or 45% of the portfolio. The firm had thought its largest single risk was only 12%.
The investment committee decides to cut the combined exposure to 25% by selling part of the holdings and adding businesses with different suppliers. When shipping delays hit the route months later, the portfolio falls less than the market. The risk manager adds a monthly report on shared risk factors to the committee pack.
Watch out
Common mistakes.
- Looking at each position alone. Small exposures that share a cause can add up to a large risk.
- Treating gross exposure as expected loss. Collateral, insurance and the chance of default change the likely loss.
- Leaving out undrawn commitments. A borrower can draw down a credit line when it is under stress, so it belongs in the total.
Questions
People also ask.
How is cumulative exposure different from concentration risk?
Cumulative exposure is the total amount at risk, while concentration risk describes the danger of having too much of it in one place.
Who sets the limits?
Boards and risk committees set internal limits, and regulators also set rules for banks and insurers.
Does cumulative exposure only apply to credit?
No, it is also used for insurance, investment portfolios, currency positions and even workplace health, where it means accumulated contact with a hazard.
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