Red flags in M&A due diligence are the findings that change the deal — they affect the purchase price, the structure, the indemnification, or whether the deal happens at all. They cluster into predictable categories, and an experienced deal team reads the data room specifically hunting for them. Knowing the catalog is what makes review systematic rather than hopeful.
Legal Red Flags
The core legal red flags are undisclosed litigation (lawsuits the seller didn't surface), change of control provisions (contracts that terminate or reprice when the company is sold), IP ownership issues (the target may not actually own its core technology), and environmental liabilities. Each of these creates significant risk, and any one can materially change the value of the target.
Financial Red Flags
Financial red flags include customer concentration — a top customer representing more than 20% of revenue, meaning the loss of one relationship craters the business — along with quality-of-earnings issues (aggressive revenue recognition, understated expenses), working capital surprises, deteriorating financial trends, and disconnects between management projections and historical performance.
Operational Red Flags
Operational red flags include key person dependencies (the business runs on one or two irreplaceable people), outdated systems requiring major investment, and deferred maintenance representing hidden future costs. Because these red flags are scattered across hundreds of documents, the risk is not understanding what they are — it's missing one in the volume. The AI agent reads every document specifically to surface these flags. It's demonstrated at omnionlinestrategies.com/ai-agent-ma-due-diligence.