Marketing Due Diligence for PE Portfolio Companies

Most PE deal teams do thorough work on financial statements, customer concentration, legal exposure, and operational structure. Marketing typically gets a lighter pass — a review of the website, a look at lead volume, maybe a question or two about CAC.

That gap matters. For B2B companies at $10M–$50M where revenue growth is the primary value creation thesis, the state of the marketing function is one of the most important things to understand before close — and one of the most expensive to fix post-acquisition if you get it wrong.

Here's what rigorous marketing diligence actually looks like.

Why Marketing Gets Underweighted in Diligence

Two reasons. First, marketing is hard to quantify compared to EBITDA or customer churn. There's no standard marketing health metric that shows up on a data tape.

Second, most deal teams don't have a marketing operating partner or senior marketing resource involved in diligence. Legal reviews legal. Finance reviews finance. Marketing often goes unreviewed by anyone who actually knows what good looks like.

The result is acquisitions where the growth thesis assumes 30% revenue growth but the marketing function is running three tactics inconsistently with no attribution model and no ownership of pipeline.

The Five Areas of Marketing Diligence

1. Positioning and ICP Clarity

What to assess: Is the company's value proposition specific enough to resonate with a defined buyer? Or is it generic enough to apply to any mid-sized B2B company?

What to look for:

• Can management articulate their ICP in one or two sentences — not just industry and size, but the specific trigger that causes a company to buy?
• Is the website messaging consistent with how sales describes the product in calls?
• Do the testimonials and case studies reflect the actual ICP, or are they a scattered set of use cases?

Red flag: "We sell to any B2B company that needs marketing help."

Green flag: "We sell to B2B SaaS companies at $5M–$20M ARR, 18 months post-Series A, when they're starting to build an outbound motion and their founder-led sales stops scaling."

Specificity is a sign of market understanding. Vagueness is a sign of a company that has grown on referrals without ever having to compete for attention.

2. Demand Generation Infrastructure

What to assess: Does the company have a repeatable system for generating qualified pipeline, or is it dependent on founder relationships, referrals, and occasional campaigns?

What to look for:

• What percentage of pipeline is inbound vs. outbound vs. referral? What's the trend over the last 12 months?
• Is there a documented outbound process, or does "outbound" mean individual reps sending ad-hoc emails?
• What's the content and SEO posture? Is organic search generating meaningful traffic, or is the site essentially invisible?
• Is there a clear follow-up cadence for inbound leads, or do leads fall through?

Red flag: 80%+ of pipeline comes from founder relationships and referrals with no system to replace or supplement them post-close.

Green flag: At least one channel generating consistent inbound pipeline with measurable CAC and conversion metrics.

3. Marketing Team and Capability

What to assess: Is there a marketing function capable of executing the growth plan — or is "marketing" one person doing design, social, and events with no strategic ownership?

What to look for:

• Who owns marketing, what's their background, and have they operated at the scale the growth plan requires?
• Is there a clear reporting structure between marketing and sales?
• What tools are in use and how well are they configured? (CRM, marketing automation, attribution)
• What would it cost to upgrade the marketing function to the capability level the thesis requires?

Red flag: Marketing is run by someone with a content or design background with no demand gen experience, reporting to the VP of Sales.

Green flag: A senior marketer with B2B demand generation experience, clear ownership of pipeline contribution, and a functioning reporting cadence with sales.

4. Attribution and Metrics Maturity

What to assess: Does the company know what's working and what's not — and can they prove it?

What to look for:

• Is there a functioning CRM with opportunity source data? Can management tell you what percentage of closed deals originated from each channel?
• What is the marketing-sourced pipeline contribution as a percentage of total?
• Is there a defined MQL definition that both marketing and sales agree on?
• What's the trend in CAC over the last 12 months?

Red flag: "We track leads in a spreadsheet." Or: "Our CRM data isn't very clean right now."

Green flag: Management can pull a clean report showing pipeline by source, conversion rates by stage, and CAC by channel — in under 10 minutes.

5. Post-Close Marketing Upgrade Cost and Timeline

What to assess: What does it cost to get the marketing function to where it needs to be — and how long does it take?

What to look for:

• Is the gap a leadership gap (need to hire or bring in fractional CMO), a team gap (need to add headcount), a tools gap, or a strategy gap?
• How long will it take to see results from marketing investment? (For demand gen, typically 6–12 months to see compounding returns.)
• What's the risk that marketing investment doesn't perform? (What are the key assumptions in the growth thesis that depend on marketing?)

Red flag: The growth plan assumes a 40% pipeline increase from marketing without a budget, a leader, or a clear plan for how that happens.

Green flag: A specific post-close marketing plan with a named resource, a budget, and milestones that connect to the revenue thesis.

How to Structure a Marketing Diligence Process

For companies where revenue growth is a key part of the value creation thesis, marketing diligence should include:

Management interview (2–3 hours): Direct conversation with whoever owns marketing on all five dimensions above. Listen for specificity, data fluency, and ownership of pipeline.

Data review: Pull CRM data for pipeline by source, conversion rates, and CAC for the last 12–24 months. Ask to see the attribution model.

Channel audit: Review website, SEO posture (organic traffic trend via public tools), content library, and active campaigns. Assess quality and consistency.

Third-party assessment: Engage a senior marketing operator — either a marketing-focused operating partner or a fractional CMO with portfolio company experience — to run the assessment and score it against your growth thesis assumptions.

Fractional CMO as a Post-Close Play

For many portfolio companies, the fastest way to close the marketing gap post-close is a fractional CMO.

It's faster than a full-time hire (no 6-month recruiting process), cheaper than the wrong full-time hire (no $200K+ salary plus severance risk), and more accountable than an agency (fractional CMOs own pipeline, agencies own deliverables).

At CMO Grow, we work directly with PE operating partners and portfolio company CEOs to assess the marketing function pre-close and run the post-close marketing upgrade. If you're evaluating an acquisition and want a marketing operator's view before you close, get in touch.