Commercial Due Diligence: What Private Equity Pays Consultants to Find
Before a fund buys a company, someone has to answer the only question that matters: is the growth story true? That someone is usually a consulting team on a three week sprint.
The Assignment
When a private equity fund gets serious about buying a company, it commissions three investigations at once. Accountants verify the financial statements, lawyers verify the contracts and liabilities, and a consulting team verifies the story, the claims about market size, growth, customer love, and competitive position that justify the price. That third workstream is commercial due diligence, usually shortened to CDD, and it is the purest expression of what strategy consultants are actually for. The fund is about to wire hundreds of millions of dollars partly on the strength of a management presentation written by people who want the deal to happen. Someone unconflicted has to check.
The Four Questions
Every CDD, whatever the industry, is organized around four questions. Is the market real, meaning how big is it genuinely, how fast is it growing, and does the target\'s definition of its market conveniently include things it does not actually compete for. Is the target\'s position defensible, meaning why do customers choose it, would they leave for a cheaper rival, and what does the competitive set look like in five years. Is the growth plan credible, meaning does the hockey stick in the management deck rest on identifiable customers and capacity or on spreadsheet optimism. And what could kill it, the regulatory changes, technology shifts, or customer concentration that turn a good business into a bad purchase. Note what is absent, nobody asks the consultants whether the price is right. That is the fund\'s job. The consultants\' job is to make sure the thing being priced is real.
Three Weeks, One Answer
The defining constraint of CDD is time. Deal processes run on tight calendars, so a workstream that would take a leisurely quarter gets three to six weeks. The team compensates with structure. Week one builds the market model from industry data and frames hypotheses. Weeks two and three are dominated by the part of the work with genuine information content, primary research, meaning dozens of structured interviews with the target\'s customers, former customers, competitors, and industry veterans, often sourced through expert networks. Customers will tell a neutral interviewer things they would never tell the company, that the product is loved but the switching costs are the real lock in, that a rival\'s new offering is quietly winning trials, that the purchasing department has been told to find a second supplier.
The management deck says what the company believes. The customer interviews say what the market believes. CDD exists because those two documents never quite match, and the gap between them is where deals succeed or die.
The Output and Its Consequences
The deliverable is a report and a recommendation that lands in one of three zones. Green, the story checks out and here are the real upsides. Yellow, the story mostly holds but specific claims are overstated, priced accordingly. Red, the thesis has a structural flaw, walk away. Reds are rare and career defining in both directions, killing a deal the partners wanted costs relationship capital, but blessing a deal that later blows up costs far more. Funds keep score. The consulting firms that dominate this market built their franchises on being right often enough that their reports move final prices, and a downgraded CDD finding routinely knocks real money off a purchase price or reshapes the deal\'s earnout terms.
Why Students Should Care
CDD matters to a reader of this site for two reasons. First, it is a large and growing share of what elite consulting firms actually sell, so if you interview at one, you are interviewing partly for this work, and case interviews about market size and competitive dynamics are dress rehearsals for it. Second, the mental checklist generalizes to any investment decision you will ever make, including buying a single share of stock. Is the market real, is the position defensible, is the growth plan attached to anything, what kills it. Run those four questions against any company\'s investor presentation and you are doing amateur CDD, which is a considerably better hobby than reading price targets.
The Bottom Line
Commercial due diligence is consulting with the stakes visible, a compressed, interview driven investigation of whether a target\'s growth story survives contact with its own customers. The work is structured around four unchanging questions and delivered under deal deadline pressure, and its conclusions move real prices. It is also the best template finance offers for skeptical thinking, trust the numbers, verify the story, and remember that the people who wrote the deck want the deal to close.