The Blind Spot of Due Diligence

Let me start with the part nobody likes to hear: most of the due diligences I've seen in over two decades of M&A in Brazil looked in the wrong place. They looked at the numbers down to the last decimal, combed through labor and tax contingencies, measured legal risk under a magnifying glass — and solemnly ignored the very thing that, the day after closing, determines whether the deal works or turns into a nightmare: the real quality of the target company's internal processes.

Peter Drucker has a line I always repeat: “Culture eats strategy for breakfast.” In acquisition practice, I adapt it: processes eat valuation for lunch. You can have paid a fair multiple, structured an impeccable SPA, and still destroy value — simply because the operation you bought can't withstand the scale you projected in the spreadsheet.

This is the blind spot of due diligence. And it's expensive.

The simplistic assumption that costs millions

It starts from a comfortable premise: that everything that matters, for better or worse, would already be reflected in the financial statements. It's a dangerous half-truth. The statements are a photograph of the past — and a retouched photograph, in many cases. They don't capture the operational bottleneck that only shows up when volume doubles. They don't show the management system held together by three spreadsheets and one employee who “knows how everything works.” They don't measure the customer service that collapses when the client base grows 40%.

There are internal processes that work perfectly for the company's current reality but become a time bomb as the business scales. They're flaws that may not even affect short-term profit — which is why they go unnoticed — but that stall growth, complicate integration, and sabotage the capture of synergies after the deal. The buyer discovers, too late, that they bought a company that doesn't scale at the desired pace.

Want a gauge? Classic research from the Harvard Business Review has for years shown that between 70% and 90% of acquisitions fail to deliver the promised value. And most of the post-mortem doesn't blame the price. It blames integration. It blames operations. It blames exactly what traditional due diligence didn't look at.

Four stories that fit the same lesson

Let me leave theory behind and get concrete, because it's in the real cases that the penny drops.

HP and Autonomy. In 2011, HP bought the British company Autonomy for around US$ 11 billion. A little over a year later, it wrote off US$ 8.8 billion. Much of the narrative turned into a dispute over accounting, it's true — but the backdrop is a due diligence that didn't truly understand how the target company operated, how it recognized revenue, how its commercial and internal processes actually worked beneath the veneer. When you can't see the gears, you buy the packaging.

Daimler and Chrysler. The 1998 “merger of equals” brought together two operations that, on paper, complemented each other beautifully. But on the factory floor and in the office, they were two worlds: product development processes, governance, and decision-making pace that were completely incompatible. No synergy spreadsheet survives an operational clash of that magnitude. Years later, Chrysler was sold for a fraction of what it had cost.

Quaker and Snapple. Quaker bought Snapple for US$ 1.7 billion in 1994 and resold it for about US$ 300 million just three years later. The mistake wasn't the sticker price — it was failing to understand that Snapple's distribution model and commercial processes were the soul of the business. In trying to fit the operation into its own logic, Quaker broke precisely what made the brand work.

Disney and Pixar. So it doesn't seem like there's only tragedy: in 2006 Disney bought Pixar for US$ 7.4 billion and did almost everything right where it counts. There was a deliberate care to understand and preserve Pixar's creative processes and operational culture before and after the deal. The result became a case study in value capture. The difference from the earlier examples isn't the size of the check — it's that someone looked at the operation, and not just the balance sheet.

Four deals, one moral: the price is almost never the problem. The problem is what happens — or fails to happen — in the operation after the signatures on the SPA.

Who's left holding the hot potato after closing?

So what happens when this analysis disappears from the scope of due diligence? The responsibility simply slides into the lap of the buyer's internal team. And here lies a double problem.

First: this team, most of the time, isn't prepared to make a fine operational diagnosis of the company just acquired. Second: even when it is prepared, it isn't available, because they're the same people who need to, at the same time, run the day-to-day business and “absorb” the newly bought operation. Predictable result: no one looks at the processes in depth at the moment when looking would be cheap.

The operational flaws that could have been mapped and fixed in the first weeks after the acquisition appear much later — with more cost, more noise, and far less time to repair. It's the difference between correcting course in the first 100 meters and trying to do it at 200 km/h with the car already in the curve.

Tim Koller, Marc Goedhart, and David Wessels, in the valuation bible “Valuation: Measuring and Managing the Value of Companies” (McKinsey/Wiley), are insistent on this point: value in M&A isn't born at the deal announcement, it's born in post-acquisition execution. And execution, at the end of the day, is process. (McKinsey & Company — research on value creation in M&A.)

The invisible cost of finding out too late

There's a perverse fact that few buyers price in: the golden window for integration is extremely short. Galpin and Herndon, in “The Complete Guide to Mergers and Acquisitions,” call it the “first 100 days rule” — it's in this period that integration advances with maximum energy, attention, and political legitimacy. Once that window passes, organizational inertia wins. Every unresolved bottleneck in the first months tends to become a structural problem.

Think about the cascade effect. A fragile billing process doesn't just jam the finance department: it contaminates cash flow, distorts indicators, delays systems integration, and undermines the two teams' trust in each other. If those bottlenecks had been identified and worked on during the due diligence phase, integration would be faster, the transition smoother, and the efficiency gains would come sooner — not after burning through cash and patience.

In Brazil, this risk is amplified by regulatory and tax complexity. An operation that looks well-oiled can hide dependence on specific tax regimes, liabilities from poorly documented processes, or contractual entanglements that only an operational eye — not just a legal-financial one — can anticipate. It's worth remembering that corporate reorganizations arising from M&A run up against rules from the CVM and, in significant deals, the scrutiny of CADE (Law No. 12,529/2011). But regulation is what you see. Process is what you feel.

Turning the report into results

This is exactly where I believe M&A advisory needs to evolve. Biz Invest is one of the few — if not the only — M&A consultancies that builds a real analysis of the target company's internal processes into the due diligence. Not a cosmetic appendix in the Info Memo, but a genuine operational diagnosis, done by people who understand management and not just the balance sheet.

And I'll go further: when necessary, we act directly on fixing those processes immediately after the transaction closes. Instead of delivering a beautiful report that goes to sleep in a drawer, we put our hands on the operation to accelerate value capture for the buyer, taking advantage of precisely that first-100-days window when everything is still possible.

Because a report, however well written, doesn't move a single process. What moves a process is people working inside the operation. And that's the difference between a deal that looks good in the press release and a deal that shows up, down the line, in the results.

Before you sign, look inside

If you're on the buy side and have an acquisition on the radar, ask your advisors an uncomfortable question: “Are you going to analyze how this company actually operates, or just how it appears in the income statement?” The answer to that question is worth, literally, millions.

Want to see the blind spot before it costs you dearly? Talk to Biz Invest and discover how a due diligence that looks at processes — and not just the numbers — can shorten your integration and bring your synergies forward.

No income statement reveals how a company breathes. Whoever buys only the numbers buys a photograph. Whoever buys the processes buys the company.