Dean "Rocky" Rockwell
A manufacturing business rarely falls apart because the machines stop running.
Deals collapse because confidence does.
By the time a buyer reaches due diligence, they have usually already decided they like the business. The customer base makes sense. The margins appear attractive. The market position is compelling. The management presentation went well. Everyone shakes hands and talks about “getting to the finish line.”
Then diligence begins.
This is the phase where buyers move from optimism to verification. Financials are tested. Operational assumptions are challenged. Inventory is examined. Customer relationships are scrutinized. The story behind the business suddenly matters as much as the numbers themselves.
And in manufacturing transactions, that process can get messy quickly.
Over the years, we’ve seen otherwise strong manufacturing companies lose leverage, suffer valuation reductions, or fail to close altogether for reasons that were often preventable long before the first LOI arrived.
Here are five of the most common reasons manufacturing deals fall apart during due diligence.
Every privately held manufacturing company has some level of normalization adjustment.
Owner vehicles. Family payroll. Excess compensation. One-time legal expenses. Non-recurring equipment purchases.
None of that surprises buyers.
What concerns buyers is when adjusted EBITDA starts to feel more theoretical than factual.
This is where many owners unintentionally lose credibility. Add-backs that were casually discussed during management meetings suddenly require detailed support during a Quality of Earnings review. If the explanations become inconsistent or poorly documented, buyers begin discounting the entire earnings story.
And once credibility starts slipping, valuation usually follows close behind.
One metal components manufacturer we advised had historically run several non-operating expenses through the business. The adjustments themselves were legitimate, but the documentation behind them was inconsistent. Before going to market, we worked closely with ownership to organize the support, align the presentation, and proactively address likely diligence questions.
That preparation mattered.
The process ultimately generated more than 50 signed NDAs and five competitive LOIs, with the company closing above the owner’s initial expectations. The earnings did not change. The confidence in those earnings did.
There is an old saying in manufacturing: measure twice, cut once. The same principle applies to EBITDA adjustments.
Inventory issues have derailed more manufacturing transactions than most owners realize.
Not necessarily because inventory is wrong — but because buyers cannot easily understand it.
In many closely held manufacturing businesses, inventory systems evolve over time rather than through deliberate design. ERP modules are partially implemented. Cycle counts are inconsistent. Obsolete inventory lives quietly on upper shelves like retired employees nobody officially let go.
Then diligence arrives and someone asks a deceptively simple question:
“Can you walk us through how inventory ties to the general ledger?”
Silence tends to follow.
Manufacturers often operate successfully for years with inventory procedures that are operationally sufficient but not transaction-ready. The issue is not perfection. Buyers understand manufacturing environments are dynamic. The issue is whether the company can explain the process credibly and consistently.
We recently worked with a company where inventory reports did not directly tie to interim GL balances because the accounting system and inventory module operated somewhat independently during the year. On paper, that looked alarming. In reality, management maintained monthly verification procedures around high-value items, monitored purchasing activity closely, and understood the operational drivers behind fluctuations.
Once properly explained, the issue became manageable.
Without explanation, it would have looked like a control problem.
Customer concentration is usually the first operational risk buyers examine.
If your top three customers represent 60% of revenue, buyers immediately begin modeling downside scenarios. Losing a major account after closing can materially impair returns, particularly in manufacturing businesses with high fixed overhead.
But concentration itself is not always the problem.
The real issue is whether the customer relationships are durable.
One manufacturer we advised had a customer representing nearly 30% of revenue. On initial review, buyers flagged it as a significant concern. Once diligence progressed, however, the narrative changed. The supplier relationship had existed for more than fifteen years, involved recurring engineered components, and was deeply integrated into the customer’s production environment. Replacing the supplier would have required qualification delays, operational disruption, and material switching costs.
The concentration remained.
The perceived risk did not.
Conversely, we have seen companies with lower concentration still struggle because relationships were transactional, pricing pressure was intense, or customer contracts lacked visibility.
In manufacturing, buyers care less about concentration percentages than they do about customer stickiness.
ERP systems are not glamorous topics. Neither are job costing procedures or production reporting workflows.
Until someone tries to buy your company.
Buyers want visibility. They want to understand margins by job, inventory movement, production efficiency, purchasing controls, and scheduling reliability. When critical information lives inside spreadsheets, handwritten notes, or the memory of a production manager who has been there since 1997, buyers get nervous.
Not because imperfect systems automatically destroy value, but because they create uncertainty around scalability.
A fabricator operating on a fully integrated ERP platform with clean reporting, scheduling visibility, and documented workflows will almost always attract stronger buyer confidence than a similar operation relying heavily on manual processes.
We have seen ERP implementations completed six to twelve months before sale materially improve buyer perception and valuation outcomes. Not because software magically changes earnings, but because operational maturity reduces perceived risk.
That distinction matters.
One Buffalo-area precision manufacturer we represented lacked a fully integrated ERP environment. Rather than trying to hide the issue, we positioned it correctly. The business had strong customer retention, experienced management, and highly repeatable operations. Buyers ultimately viewed the systems gap as a solvable scalability opportunity rather than a structural weakness.
Context matters more than perfection.
This remains one of the most common — and most expensive — manufacturing deal issues.
If the owner is:
· the head of sales,
· the quoting department,
· the customer relationship manager,
· and the unofficial plant manager,
buyers will notice immediately.
And they will structure around that risk accordingly.
Sometimes that means valuation discounts. Sometimes it means earnouts. Sometimes it means extended employment agreements that owners never intended to sign.
Manufacturing businesses with strong second-level leadership almost always command better outcomes because buyers see continuity beyond the founder.
One precision machining client intentionally spent two years building management depth before beginning a sale process. They hired an operations leader, delegated quoting responsibilities, documented workflows, and reduced customer dependence on the owner personally.
The result was a materially stronger process and a premium valuation multiple because buyers saw scalability without requiring the founder’s daily involvement.
Ironically, the businesses that become easiest to sell are often the businesses owners no longer need to run personally every day.
That distinction is important.
Most diligence issues do not appear suddenly. They were usually sitting quietly beneath the surface for years:
· undocumented margins,
· inconsistent inventory procedures,
· customer concentration,
· owner dependency,
· unclear financial adjustments.
A structured process simply forces them into the open.
The good news is that most manufacturing diligence problems are solvable when addressed early and framed properly. Buyers are not expecting perfection. They are looking for transparency, credibility, and operational understanding.
The strongest manufacturing transactions are rarely the cleanest businesses on paper.
They are the businesses where the story, the numbers, and the operational realities all align clearly enough for buyers to underwrite with confidence.