Worldwide ad spending grew 8.6%. The agencies serving it lost revenue.

Why are most services firms unsellable?

Because a buyer is purchasing future cash flow and a typical services firm cannot demonstrate that it has any. The revenue is real, the profit is real, and neither survives contact with the question a buyer is actually asking, which is what happens to this business the day the founder stops working.

It resolves into four tests, and most firms fail at least three. There are no recurring contracts, so revenue is a series of projects that have to be won again. Origination runs through the founder, so the pipeline is a relationship rather than a system. Client concentration is high, because a small number of good relationships is how services firms grow. And nothing is owned: no methodology that produces a result without the specific people, no data, no software, no position that a competitor would have to build rather than hire.

The reason this matters more than any multiple discussion is that these are not pricing factors. A firm failing all four is not worth less. It is frequently not sellable at all to an institutional buyer, and its realistic outcomes are a small strategic tuck-in, a management buyout funded by the firm's own cash flow, or a wind-down.

The useful part is that each of the four is separately fixable, and none requires the firm to become something it is not.

What does the current transaction data show?

That the category is transacting, that sponsors are the growth in it, and that they are explicit about what they will not buy. Marketing services dealmaking rose 7.5% year on year in 2026 to date, with private equity M&A up 17.4% and outpacing both strategic buyers and the total market, while strategics still retain 68.6% of deals (Capstone Partners, Marketing Services Market Update, 22 April 2026).

Inside that, sponsors prioritized add-on acquisitions and platform formations fell year on year. The stated screen is low customer concentration, high recurring revenue and AI-enabled delivery. Project-based, client-concentrated agencies are strategic tuck-ins rather than platforms, and that classification is worth more than any negotiation over the multiple, because it determines which buyer list the firm belongs on.

One thing this article does not do is quote a current multiple for the size band. The most recent published table of middle-market multiples by enterprise value band covers the first nine months of 2025, and the quarterly series that circulates for early 2026 could not be traced to a source we could open. A firm being told what services businesses trade at should ask which dataset that came from and what period it covers.

What is AI doing to the category?

Separating the market for marketing from the businesses that serve it. Worldwide ad spending grew 8.6% year on year in 2025 while holding company revenues fell 1.2% (eMarketer, Ad Agency Trends 2026, January 2026). The category expanded by nearly nine points and the incumbents serving it shrank. That divergence is the whole story and it is not a demand problem.

The client-side evidence is direct. Sixty percent of US senior marketing leaders said they spent less on agencies in 2025 as a direct result of AI, 83% said they would cut agency spending if they could fully automate content creation, and 11% said they would stop using agencies entirely (eMarketer and Typeface signal reporting, January 2026). Twenty-nine percent of agencies report client pushback on hourly rates citing AI-driven productivity gains (RevenueMemo, Marketing Agency Statistics 2026, 3 June 2026).

The supply side is adjusting faster than the revenue. After an average 8% agency headcount reduction across the industry in 2025, a 15% reduction in agency jobs is forecast for 2026 alone (Forrester, cited in Ritner Digital, May 2026). Fifty-three percent of agency owners now agree AI is a credible threat to the agency business model, up from 44% a year earlier (RevenueMemo, 3 June 2026).

Buyers have priced this before sellers have. Business services deal volumes are forecast to decline in 2026, with AI exposure in professional services named as the explicit risk, and acquirers are underwriting whether AI accelerates or erodes a given services business over a three to five year horizon (PwC, Global M&A trends in industrials and services: 2026 mid-year outlook, June 2026). A seller without an evidenced answer to that question is answering it by default, in the buyer's favour.

What actually changes the answer?

Each of the four tests has a concrete version, and they are worth doing in order of lead time rather than in order of difficulty. Contracts are the fastest. Converting retainers into terms with notice periods, and project work into annual agreements with a scope, changes the revenue from a history into a schedule. That can be done inside a renewal cycle and it is the highest-return single change available.

Origination is the slowest and the most valuable. A buyer is testing whether new business arrives when the founder is not in the room, which means a documented source of pipeline, named people other than the founder closing it, and at least a year of evidence. This is the test that decides platform status, and platform status is worth more than any other classification in the process.

Client concentration is arithmetic plus time, and it has to land inside the trailing period a buyer underwrites, which is why it has to start years before a sale rather than months. We have written separately on how far ahead that program has to begin and on why concentration removes bidders rather than simply lowering the price.

Owning something is the one most firms dismiss and the one that most changes the category the business is valued in. It does not require software. A methodology that produces a repeatable result, proprietary data accumulated from the work, or a position in a regulated or compliance-driven niche all qualify, because each of them is something an acquirer would otherwise have to build.

Which service businesses are still clearing well?

The ones selling contracted, compliance-driven or regulated work, and the gap between them and the rest of the category is wide. Environmental services printed 38 deals in June 2026, up 23% year on year, against a decline of roughly 17% in overall US deal count, with regulatory compliance deadlines running into 2027 and beyond as named demand drivers (PitchBook data, reported via Blue River Financial Group, July 2026).

The same pattern holds across professional services where the revenue is mandated rather than discretionary. Accounting services volume rose 14.8% year on year in 2026 to date, with financial acquirers taking 54.8% of transactions against 38.9% a year earlier (Capstone Partners, Accounting Services M&A Update, 13 July 2026). Environmental, health and safety services reversed a two-year downtrend with 61 transactions, up 15.1% (Capstone Partners, EHS Market Update, 30 June 2026). Wealth management recorded its most active second quarter on record (Echelon Partners, reported 28 July 2026).

The common feature is not the sector. It is that the client cannot easily stop buying, the work recurs on a schedule someone else sets, and the delivery is not the thing being automated. A services firm that can move any part of its revenue toward that description is moving toward the half of the category that is clearing.

For firms that cannot, the honest reading of the current data is that the window for selling on the old basis is narrowing rather than closed, and that the four tests above are worth more attention than the timing of the market.