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Supplier Risk

The ISG Collapse: 5 Supplier Risk Warning Signs Procurement Teams Should Never Ignore

Alexander Jaiyesimi, MCIPS

· 9 June 2026 · 8 min read

On 20 September 2024, ISG, one of the UK's largest construction and fit-out contractors, filed for administration. Around 2,200 people lost their jobs, hundreds of projects halted, and a supply chain owed over £700 million was left with little prospect of recovery. It was the largest collapse in the construction sector since Carillion in 2018. And like Carillion before it, the warning signs had been there.

WHAT HAPPENED

What Happened to ISG?

ISG was a UK-based contractor with a turnover of £2.2 billion in 2022, delivering major fit-out, construction, and data centre projects across the public and private sectors. On paper, it looked like a substantial, credible business.

Beneath the surface, the financial position had been deteriorating for years. The pandemic exposed underlying weaknesses, particularly a concentration of fixed-price, high-rise residential contracts signed before the sharp escalation in material and labour costs. These contracts became deeply loss-making, and ISG was unable to exit them.

By 2023, the company was preparing to post a post-tax loss of £133 million, with £148 million in contract writedowns. Its 2023 accounts were never formally filed. When administration was declared, EY found just £35 million available against total debts of £1.1 billion. Trade creditors received nothing.

KEY FIGURES

£1.1bn

Total debts at administration

£35m

Available to distribute — all creditors

£700m+

Supply chain exposure

WHY CARE

Why Procurement Teams Should Care

ISG's collapse was not an isolated event; it was a reminder of a recurring pattern in the construction and engineering sectors and increasingly visible across other capital-intensive industries. For procurement teams managing supplier relationships with contractors or other businesses operating on tight margins and with complex project delivery commitments, the ISG case raises a direct question: How confident are you in the financial health of your critical suppliers right now?

Real World Impact - Seventynine Lighting

A specialist lighting subcontractor left with over £2 million in unrecoverable debt following ISG's collapse, forcing it into administration, with 30 staff made redundant.

£2m+

Unrecoverable debt

Unrecoverable

debt

Staff made redundant

Staff made

redundant

Oct '24

Entered administration

Entered

administration

WARNING SIGNS

The 5 Supplier Risk Warning Signs

Wafer-Thin Operating Margins

ISG's operating margin was approximately 2% on a turnover of £2.2 billion. At that level of compression, there is almost no buffer to absorb cost overruns, project delays, or contract disputes. A large revenue number can mask a business that is one bad contract away from insolvency.

What to look for:

Operating margins below 3–5% in capital-intensive industries, combined with high leverage or concentrated contract risk, should trigger enhanced monitoring.

Late or Missing Financial Filings

ISG's 2023 accounts were never filed. Companies House filings are publicly available. A supplier that is consistently late in filing accounts or that files abbreviated accounts that obscure the true financial position is a supplier whose financial health cannot be properly assessed. Absence of information is itself a risk signal.

What to look for:

Check Companies House filing history for your critical suppliers. Late filing, dormant entity patterns, or a shift from full to abbreviated accounts should prompt questions.

Withdrawal of Credit Insurance

Following a winding-up petition in October 2023, credit insurers withdrew cover for multiple ISG suppliers, a direct indication that professional risk underwriters had already made their assessment, months before the public collapse. Credit insurers have access to financial intelligence that most procurement teams do not.

What to look for:

If your organisation or sub-tier suppliers use trade credit insurance, monitor cover status on critical counterparties. Withdrawal of cover is a serious early warning signal.

Overexposure to Fixed-Price Contracts

ISG's downfall was substantially rooted in a portfolio of fixed-price contracts signed before the pandemic, when material and labour costs were predictable. When inflation hit, those contracts became deeply loss-making with no recovery mechanism. Understanding whether your suppliers are carrying unmitigated cost risk is increasingly essential.

What to look for:

Where suppliers deliver complex, long-duration projects on fixed-price terms in a high-inflation environment, probe their margin protection mechanisms directly. If they cannot answer clearly, that is itself a warning sign.

Adverse Media, Legal Notices and Winding-Up Petitions

A winding-up petition against ISG was filed by a subcontractor before the final collapse, a matter of public record visible in court filing databases and in adverse media monitoring. For those watching, it was one of the clearest signals that the business was in serious difficulty.

What to look for:

Set up adverse media monitoring for critical and high-value suppliers. Court filings, CCJs and regulatory notices are public record. Negative trade press coverage often surfaces problems well before formal disclosure.

WHAT THIS TELLS US

What the ISG Collapse Tells Us About Supplier Risk Management

The ISG case exposes a structural gap in how many procurement teams manage supplier risk. Supplier assessment tends to be front-loaded, applied rigorously at onboarding, then revisited infrequently or only when triggered by an obvious event.

But supplier risk is not static. It evolves continuously, shaped by contract performance, cost pressures, market conditions, and financial management. A supplier that passed your due diligence process 18 months ago may look very different today.

The Carillion collapse in 2018 was supposed to be a wake-up call. ISG in 2024 confirms that the lesson has not yet been sufficiently learned.

PRACTICAL ACTIONS

Practical Actions Procurement Teams Can Take

Implement a continuous supplier monitoring cadence

Move away from annual or event-triggered reviews. Critical and high-value suppliers should be subject to regular financial health checks, at a minimum, quarterly, with real-time adverse media monitoring running in parallel.

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Review your supplier tier exposure

ISG's collapse devastated not just direct suppliers but the sub-tier supply chain. Map your exposure beyond tier one. Understand which of your suppliers carry their own significant supplier concentration risk.

Scrutinise contract structures

Where your suppliers are delivering work on fixed-price terms in volatile cost environments, understand the margin protection mechanisms in place. If there are none, factor that into your risk assessment.

Act on credit insurance signals

Develop intelligence-sharing relationships with your finance and treasury teams. If trade credit insurance cover is being withdrawn on a supplier, that information is commercially critical and should be escalating to procurement leadership.

Don't ignore the trade press

In construction, FM, engineering, and other project-heavy sectors, industry publications frequently surface supplier distress signals months before formal action. Make monitoring of relevant trade press part of your supplier intelligence workflow.

SUPPLIERSENSE

How SupplierSense Can Help

SupplierSense is an AI-powered supplier intelligence platform designed to give procurement teams continuous visibility of supplier risk and sustainability signals, without relying on supplier questionnaires or waiting for annual reviews.

For each supplier in your portfolio, SupplierSense aggregates and analyses external intelligence signals across six layers, surfaced through a clean, prioritised dashboard that helps procurement teams focus on what matters most.

Financial health

Adverse media

Sanctions exposure

ESG risk signals

Country risk

Network and ownership

Three of the five warning signs visible in the ISG case, financial deterioration, late or missing filings, and adverse media signals, sit directly within SupplierSense's intelligence coverage. The platform surfaces the underlying signals that precede events such as credit insurance withdrawal, giving procurement teams the visibility to act before they occur.

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KEY TAKEAWAYS

ISG's collapse in September 2024 was the largest construction failure since Carillion, leaving over £700 million in supply chain losses with trade creditors recovering nothing.

The warning signs, thin margins, late accounts, credit insurance withdrawal, adverse media, and fixed-price contract overexposure were available well in advance of the formal collapse.

Supplier risk management must be continuous, not periodic. Front-loaded onboarding due diligence does not protect organisations from the ongoing evolution of supplier risk.

Procurement teams should extend their monitoring beyond tier one suppliers. The cascading impact on ISG's sub-tier supply chain demonstrates how quickly second-order exposure can materialise.

Real-time external intelligence, including adverse media, court filings, and financial signals, is one of the most practical and underutilised tools available to procurement teams today.

CONCLUSION

The ISG collapse is the latest in a long line of high-profile contractor failures that share a common thread: the warning signs existed, they were publicly available, and they were not acted upon in time.

Procurement teams cannot prevent the market conditions that cause supplier distress. But they can build the visibility to see it coming, and the processes to respond before it becomes a crisis.

The question after ISG is not whether supplier financial monitoring matters. It clearly does. The question is whether your organisation currently has the tools and processes to do it effectively.

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