What Investors Look for in a Marketing Function During Due Diligence
- Roger M.
- Apr 16
- 6 min read
The diligence team spends three weeks inside your data room. They review financials with forensic precision. They stress-test the revenue model. They interview key customers. Then they get to the marketing function — and the conversation changes.
“What percentage of new logo ARR is marketing-sourced?”
“We’re not sure. We think it’s significant.”
“What is CAC payback by channel?”
“We have a blended number. We haven’t broken it out by channel.”
“If the founder stepped back from sales, what happens to pipeline?”
Silence.
This is not a hypothetical. It is the reality in the majority of B2B acquisitions and fundraise processes. The marketing function was never built to withstand investor scrutiny because nobody expected it to be scrutinised with this intensity. But in 2026 — with entry multiples at a record 11.8x EBITDA and revenue growth accounting for 71 percent of exit value creation — the commercial engine is the asset. And the marketing function is the part of that engine investors understand least and scrutinise most carefully.
What do investors check in marketing due diligence?
Diligence teams evaluate the marketing function across five dimensions. They are not looking for impressive campaigns or creative awards. They are looking for evidence that the commercial engine is sustainable, scalable, and transferable under new ownership.
CAC defensibility is the first thing investors check because it determines whether the growth the company has demonstrated is sustainable under new ownership. A company growing 80 percent with 22-month CAC payback is growing on borrowed time — each new customer costs nearly two years to recoup, and any disruption to the acquisition engine (leadership change, market shift, channel saturation) threatens the economics. The acquirer prices this risk into the multiple.
GTM repeatability is the dimension most founders fail on. McKinsey’s GPMR 2026 reports 60 to 70 percent of PE-backed companies change their C-suite during ownership. The diligence team assumes the founder will leave eventually. They need to know the GTM survives that departure. A company where the founder closes 60 percent of deals with a 35 percent win rate — while AEs average 12 percent without the founder on the call — has a GTM that is a person, not a system. That is concentration risk priced at a discount.
Attribution cleanliness is the dimension that determines whether the diligence team trusts the other metrics. If the company claims 40 percent marketing-sourced ARR but has no multi-touch attribution and 65 percent of traffic is classified as direct/unknown, the claim is unverifiable. Unverifiable claims are discounted to zero in diligence. The investor cannot price what they cannot verify.
Customer concentration is evaluated as a risk factor that marketing directly influences. A company with three customers representing 35 percent of ARR has existential risk regardless of growth rate. The marketing function’s job is to systematically diversify the customer base through targeted acquisition and to build expansion revenue that reduces reliance on any single account. Partners Capital reports that distributions remain at roughly 10 percent of NAV — investors want predictable, diversified revenue, not concentrated bets.
Brand and positioning is the dimension most companies assume they pass on — and most underperform on in diligence. Acquirers are not evaluating whether the logo looks good or the website is modern. They are evaluating whether the company’s market position is defensible, whether it commands pricing power relative to competitors, and whether the brand would survive an integration or rebrand. A company with commodity positioning that competes purely on price gives the acquirer no margin of safety. A company with a defensible position — documented in win/loss data, competitive analysis, and pricing premium evidence — gives the acquirer confidence that the revenue base is durable.
How do you prepare marketing for due diligence?
Preparation is not a last-minute exercise. The evidence base that impresses a diligence team takes 12 to 18 months to build. But the preparation process itself can be structured into three phases.
Phase 1: Build the infrastructure (months 1–3). Multi-touch attribution configured in the CRM. UTM taxonomy standardised. Lifecycle stages documented with entry criteria. Lead scoring built. Sales-marketing SLAs signed. Revenue dashboard live. This is the plumbing that enables everything else. Without it, no credible data can be produced.
Phase 2: Accumulate the evidence (months 4–12). Every month of clean data strengthens the evidence base. By month 12, the company has consistent trend data on marketing-sourced ARR, CAC by channel, pipeline coverage, funnel conversion rates, and deal velocity by source. Diligence teams evaluate trends, not snapshots. A single quarter of strong attribution data is interesting. Eight months of consistently improving data is compelling. During this phase, the team also builds the customer cohort analysis that demonstrates revenue quality: are newer cohorts expanding faster? Are retention rates improving? Is the ICP tightening over time? These longitudinal narratives are what diligence teams remember long after they leave the data room.
Phase 3: Package for diligence (months 12–18). Prepare a marketing diligence package: attribution methodology with calculation documentation, channel performance history with trend analysis, customer cohort analysis, ICP documentation and validation evidence, GTM process maps, team capability matrix, and playbook documentation. This package should be ready before the process begins — not assembled under time pressure after the LOI is signed. The best diligence packages include a “marketing assumptions” document that makes explicit every assumption underlying the metrics: how CAC is calculated, which costs are included, how attribution credit is distributed, and what constitutes a “marketing-sourced” deal. This transparency builds trust. Diligence teams do not penalise companies for honest methodology. They penalise companies for methodology they cannot understand or verify.
Companies that begin diligence preparation 18 months before a transaction arrive in the data room with confidence. Those that begin 90 days before arrive in the data room with excuses about why the data is incomplete. The former commands a premium. The latter accepts what the buyer offers. The difference in outcome is not determined by the quality of the product or the size of the market. It is determined by whether the marketing function was built to be auditable — and whether the company invested the time to build the evidence base before it was needed.
What marketing metrics matter in M&A?
Acquirers and investors evaluate marketing through a specific set of metrics that map directly to the valuation model. These are not marketing metrics — they are commercial performance indicators that the marketing function is accountable for.
The metrics in Exhibit 2 are not optional extras that impress sophisticated buyers. They are the baseline requirements of a marketing function that passes diligence without triggering a valuation discount. Companies that can produce these metrics with trend data and documented methodology command 1 to 3 multiple points of premium. Companies that cannot produce them accept 1 to 3 multiple points of discount.
On a $20M ARR company at a 12x baseline multiple, that spread represents $20M to $60M in enterprise value — the difference between a founder who retires comfortably and one who wonders what they left on the table.
The marketing function is no longer a back-office cost centre that gets a cursory glance during diligence. It is a core component of the commercial engine that determines the purchase price. With PE exit values at $1.3 trillion in 2025 and over 16,000 companies held more than four years waiting to transact, the competitive pressure among sellers has never been higher. The companies that stand out in a crowded exit market are not the ones with the best product or the fastest growth. They are the ones that can prove — with clean data, documented processes, and auditable metrics — that their commercial engine will continue to generate revenue under new ownership.
Building the marketing function to investor-grade standards is not a marketing project. It is a valuation project. A fractional CMO with exit preparation experience can build this function in 12 to 18 months, producing the evidence base and documentation that transforms diligence from an adversarial exercise into a validation of value. That is the highest-ROI pre-exit investment any company can make — and the one most companies make too late.
Sources: McKinsey & Company, Global Private Markets Report 2026; Partners Capital, Insights 2026; With Intelligence, PE Outlook 2026; Moonfare/Gain.pro; Bain & Company.
Comments