The marketing KPIs a deal team should ask for are the five numbers that connect marketing spend to the revenue already in the model: customer acquisition cost by channel, reconciled to invoices; CAC payback in months of gross profit; the share of new revenue coming from owned versus rented channels; pipeline that traces to closed revenue by source; and retention of the customers the company has already paid to acquire. Everything else on a marketing dashboard is supporting detail. Deal teams that request these five numbers in diligence, and keep requesting them in the board pack after close, underwrite growth on instruments that work.
Most deal teams never see them. Data rooms carry marketing decks built for a different audience: impressions, traffic, follower counts, lead volume, and platform-reported return figures that flatter the platforms reporting them. The gap is rarely deception. It is what happens when nobody defines the ask. A management team reports the numbers someone once asked for, and if no one on the deal side has named the right ones, the deck defaults to activity.
Activity metrics are the exhaust of marketing execution. They move when work happens, which makes them easy to report and nearly useless for underwriting. Impressions do not pay back debt. The question a deal model needs answered is narrower and harder: does a dollar of marketing spend return more than a dollar of gross profit, in which channel, and how fast. That question has five components, and each one has a lazy substitute that shows up in data rooms instead.
The stakes have moved. S&P Global's 2026 outlook found 71 percent of general partners and 53 percent of limited partners prioritizing operational value creation over financial engineering. Operational value creation in the commercial engine starts with instrumentation, and the diligence ask list is where a sponsor either establishes that standard or forfeits it for the first year of the hold.
1. Real CAC by channel. Not the blended figure in the deck and not platform-reported cost per conversion. Spend reconciled to invoices, conversions reconciled to closed revenue, by channel. If the company cannot produce this, that inability is a finding in itself, and it belongs in the value creation plan as a funded fix. A blended number also hides the damage: one efficient channel can subsidize another that acquires customers at three times their value for years.
2. CAC payback. How many months of gross profit from a new customer it takes to recover the cost of winning them. Payback converts marketing efficiency into the language the rest of the model already speaks: cash and time. It also exposes the difference between growth that funds itself and growth that consumes the balance sheet.
3. Owned versus rented mix. What share of new revenue arrives from channels the company owns, such as brand search, referrals, and reactivation, versus channels it rents at market price, such as paid search, lead vendors, and aggregators. Rented demand disappears the day spending stops; owned demand compounds. The mix is often wildly misread from inside. In one five-brand consumer services rollup we diagnosed, 38 percent of revenue arrived from untracked word of mouth while the paid budget grew every quarter, and the path to a 60 percent CAC reduction ran through tripling the owned share of acquisition, not cutting spend. That case study is here.
4. Pipeline that traces. Sourced pipeline by channel is only worth underwriting if it survives reconciliation: from spend to lead to opportunity to closed-won revenue, in the CRM, with the untracked paths counted. Pipeline living in spreadsheets, or attributed by whoever entered the record, inflates whichever channel the loudest team owns. The test is simple to ask and revealing to watch: pick ten closed deals from last quarter and trace each one back to its source.
5. Retention and reactivation. The cheapest customer to acquire is the one already acquired. Repeat rate, revenue share from existing customers, and the cost of reactivating a lapsed customer versus winning a new one tell a deal team whether the company grows by compounding its base or by refilling a leaking bucket at full price.
Send the ask list early in exclusivity, in writing, with definitions attached. Definitions matter more than the list itself: specify that CAC means reconciled spend over closed customers by channel, that payback is measured in months of gross profit, and that pipeline numbers must tie to the CRM. Give management two weeks. The response tells you two things at once: what the numbers are, and whether the company is instrumented to know them. Both belong in the investment committee memo.
Expect pushback on channel-level CAC, and treat the shape of the pushback as data. A team that says the agency has those numbers is describing a dependency worth pricing. A team that says the numbers do not exist but should is describing the first workstream of the hold. A team that sends five clean numbers in three days is telling you the operators are already ahead of the thesis.
The standard is not a benchmark table; benchmarks vary too much by model and margin structure to be prescriptive. The standard is traceability and speed. A company that can produce all five numbers, reconciled, within two weeks of the request has a commercial engine under control. A company that needs a quarter and three caveats does not, and the difference belongs in the price or in the plan. The upside of getting instrumentation right is not academic: in one PE-backed services company, rebuilding measurement and reallocating against real per-channel economics produced a 36 percent revenue lift over 24 months on flat marketing spend. The spend was already sufficient. The information was not.
Certain patterns in a data room deserve a haircut or a funded fix before close. A blended CAC with no per-channel view. Platform-reported return figures presented as marketing ROI. Lead counts with no conversion rates attached. Reporting that lives entirely inside an agency's accounts, which is a transfer risk as well as a visibility problem. Numbers that restate between successive board decks without explanation. None of these kills a deal; every one of them prices a gap between the growth story and the instruments available to deliver it.
The ask list does its best work when it never changes. The five numbers requested in diligence become the recurring marketing section of the board pack after close, which is what makes performance comparable from the first board meeting to exit. Pre-close, the work is outside-in and fast, part of a broader marketing due diligence pass. Post-close, the same questions get answered from inside the systems, typically through an eight-week commercial audit that fixes tracking and establishes a single source of truth, and then reported in a format a board can act on, which we cover in board-ready marketing reporting.
Sponsors who standardize this ask list across a portfolio get a second benefit: pattern recognition. The same five numbers, requested the same way, make the strong operators obvious and the instrumentation gaps impossible to hide. That is the discipline behind how we work and the results it produces.
The five numbers that connect spend to revenue: customer acquisition cost by channel reconciled to invoices, CAC payback in months of gross profit, the share of new revenue from owned versus rented channels, pipeline sourced by channel that traces to closed revenue, and retention and reactivation of existing customers. Activity metrics such as impressions, traffic, and raw lead counts are supporting detail, not underwriting inputs.
A single blended acquisition cost hides the channels doing the damage. A healthy referral engine can mask a paid channel acquiring customers at three times their value, and the blend moves for reasons that have nothing to do with efficiency, such as mix shift between locations or seasons. Per-channel CAC, reconciled to invoices and closed revenue rather than platform dashboards, is the number that belongs in the model.
There is no universal benchmark; payback depends on gross margin, contract structure, and how capital intensive growth is. The diligence question is whether the company can calculate it at all. A business that knows its payback by channel can decide where the next dollar goes; a business that cannot is navigating on faith, and the model should price that uncertainty.
The same five numbers become the standing board pack after close. Pre-close they are assembled outside-in from the data room; in the first hundred days they get rebuilt from inside the systems, usually through a commercial audit that fixes tracking and establishes one source of truth. Deal teams that keep the ask list identical from diligence through the hold get comparable numbers at every board meeting.
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