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FRM Exam Part I · Learning From Financial Disasters

Rogue Trading and Operational Failures: Key Cases

Updated 11 October 2026 · Fact-checked

Rogue trading is unauthorized trading that hides losses or inflates profits. The FRM cases show the same causes: weak segregation of duties, poor oversight, ignored warnings and weak reconciliation. To answer exam questions, match each case to its control failure and name the fix, such as independent back-office checks and strong challenge of models.

Understand Rogue Trading and Operational Failures

A rogue trader takes positions beyond their authority, or hides losses, or both. The loss itself is not the core issue. The core issue is that controls failed to detect it early. In FRM terms this is mainly operational risk: loss from inadequate or failed processes, people and systems, or external events. Market risk is what the position creates. Operational failure is why nobody stopped it.

The cases follow a pattern. At Barings (1995), Nick Leeson ran both trading and settlement in Singapore. He used an error account (account 88888) to hide losses, and the head office funded his margin calls without asking enough questions. At Daiwa (1995), Toshihide Iguchi traded US Treasuries and also looked after custody records, and he concealed losses for years by forging records. At Sumitomo (1996), Yasuo Hamanaka dominated the copper market and hid losses through unauthorized trades and off-book arrangements, while his long tenure and dominance left him largely unsupervised.

At Société Générale (2008), Jérôme Kerviel built very large unauthorized index futures positions. He used fictitious offsetting trades and knowledge of back-office procedures to evade controls. Alerts and queries were raised, but were not followed up with enough rigor. At JPMorgan's London Whale (2012), the loss came from a large synthetic credit portfolio in the Chief Investment Office. This was not a lone concealment story in the same way. It was a failure of governance, risk limits and models. A new VaR model was adopted that understated risk, it was built in spreadsheets with manual errors, and traders were reported to have marked positions favorably.

The common control weaknesses are: no segregation of duties between front office and back office, weak independent reconciliation and confirmation, limit breaches that are tolerated or waived, management ignoring red flags such as unexplained profits or large funding needs, a culture that rewards profit and does not challenge stars, and model risk that is not independently validated. The fixes mirror these: separate functions, independent valuation, mandatory leave, tight limits with escalation, strong internal audit and a challenge culture.

How to solve Rogue Trading and Operational Failures questions

Most questions give a short description of a case or a control failure and ask you to identify the cause, the case or the best remedy. Use this method.

  1. 1Read the scenario and underline the key facts: who traded, who settled, what was hidden, how long it lasted.
  2. 2Identify the case by its signature: error account and Singapore (Barings), custody records and Treasuries (Daiwa), copper (Sumitomo), index futures and fictitious hedges (Société Générale), synthetic credit and VaR model change (London Whale).
  3. 3Name the primary control failure: segregation of duties, reconciliation, limit enforcement, management oversight, or model governance.
  4. 4Separate the trigger (unauthorized position) from the root cause (weak control environment and culture).
  5. 5Match the remedy to the failure, for example independent back office for dual roles, or independent model validation for VaR model errors.
  6. 6Eliminate options that blame only market moves or only one individual, as the exam favors systemic control and governance answers.
  7. 7Check that your answer fits the case facts and not a different case.

Quickest way: Case-to-failure matching

When to use it: Use when an MCQ asks which case or which control weakness fits a description.

  1. Barings: front and back office combined, hidden losses in account 88888, head office over-funding.
  2. Daiwa: trader controlled custody records and forged them, so no independent check of securities held.
  3. Sumitomo: dominant long-serving copper trader with weak supervision.
  4. Société Générale: fictitious offsetting trades, ignored alerts, trader knew back-office controls.
  5. London Whale: model and governance failure, VaR model change, spreadsheet errors, weak challenge of the Chief Investment Office.
  6. Pick the option that matches the signature, then the remedy that fixes that exact gap.

Common mistakes in Rogue Trading and Operational Failures

  • Treating rogue trading as market risk because the loss came from positions.

    The loss shows up as trading P&L, so it looks like a market risk event.

    Fix: Classify the root cause. Failed controls, process and people mean operational risk, even when the loss comes from market moves.

  • Mixing up the cases, for example attributing custody forgery to Barings.

    The cases share themes and the names are easy to blur.

    Fix: Memorize one signature fact per case: Barings error account, Daiwa custody records, Sumitomo copper, Société Générale fictitious hedges, London Whale model.

  • Saying the London Whale was a classic lone rogue trader.

    It is grouped with the rogue trading cases.

    Fix: Describe it as a governance, limit and model failure in a large portfolio, involving VaR model changes and weak oversight.

  • Choosing a remedy that only adds a rule, such as a bigger limit or a new policy, when the failure is independence.

    Policies feel like the natural fix.

    Fix: If one person controls trading and settlement, the fix is segregation of duties and independent verification, not another policy.

  • Blaming only the individual trader.

    News stories focus on the person.

    Fix: FRM answers stress management failure, ignored warnings and culture. The trader is the trigger, not the whole cause.

Worked examples

Example 1

A trader at a bank's Asian subsidiary ran both dealing and settlement. He recorded losses in a special error account and head office kept sending funds for margin calls. Which case is this, and which control failure is most central?
A. Daiwa; no independent valuation model
B. Barings; lack of segregation of duties between front and back office
C. Sumitomo; weak credit limits for counterparties
D. London Whale; an understated VaR model

Show the solution
  1. Signature facts: dual trading and settlement role, error account, head office funding margin calls.
  2. These point to Barings, not Daiwa (custody forgery), Sumitomo (copper) or London Whale (model).
  3. The central failure is that one person controlled both trade execution and its recording, so no independent check existed.
  4. Option B matches both the case and the control failure.

Answer: B

Example 2

After a large loss, a review finds that a bank's risk team accepted a new VaR model for a synthetic credit portfolio that reduced reported VaR, the model was run in manual spreadsheets with errors, and limit breaches were not escalated. Which is the best primary remedy?
A. Ban all synthetic credit positions permanently
B. Raise trading limits so breaches are no longer triggered
C. Independent model validation, strong limit escalation and challenge of the business
D. Replace the trader with a more senior one

Show the solution
  1. The facts match the London Whale: model governance, spreadsheet error and ignored limits.
  2. The root problem is weak model validation and weak challenge, not the instrument itself.
  3. Banning a product (A) does not fix the control gaps and may move risk elsewhere.
  4. Raising limits (B) hides the symptom and weakens control.
  5. Replacing one person (D) ignores the systemic failure.
  6. Option C targets model risk and governance directly.

Answer: C

Exam tips

  • Learn one signature fact per case and the single best control lesson attached to it.
  • When an option mentions segregation of duties, independent reconciliation or independent validation, check it first.
  • Expect scenario questions where you must classify the failure as operational, not market, risk.
  • Be careful with London Whale wording: it is about models, limits and governance, not just concealment.
  • Read all four options. Wrong options often cite real controls that do not match the described gap.

Practice questions from Learning From Financial Disasters

Rogue Trading and Operational Failures: frequently asked questions

What were the main control failures at Barings?

Leeson headed both trading and back-office settlement in Singapore, so no one independently checked his records. He hid losses in an error account. Head office kept funding his margin calls without enough challenge.

Was the London Whale a rogue trading case?

It is usually treated differently. The loss came from a large synthetic credit portfolio and was tied to model changes, weak limits and weak oversight. Treat it as a governance and model risk failure.

How does segregation of duties prevent rogue trading?

It splits trade execution from confirmation, settlement and record keeping. A trader then cannot hide a loss alone. An independent function can spot mismatches and unusual activity.

Which risk category do these cases fall under for the FRM exam?

They are mainly operational risk, since the losses came from failed controls, processes and people. The positions themselves create market risk, but the root cause is the control environment.