Advertising agency due diligence

An advertising agency has few hard assets to inspect, which means diligence is almost entirely about contracts, relationships and intellectual property rather than physical inventory or equipment. The findings that actually kill agency deals tend to cluster around a handful of specific issues, and a buyer who checks each of them systematically is far better positioned than one relying on the seller’s summary of the business.

Read every agency-of-record contract, not just the summary

Pull the actual signed agreement for every material account and read the termination clause specifically — many client-side procurement contracts include a termination-for-convenience right that clients can exercise, sometimes with little notice, around a change in agency ownership. A contract summary that says "under agreement through next year" can mask a client’s unrestricted right to walk away the moment the deal is announced, and that gap only shows up by reading the actual language.

Confirm the media-buying trading terms in writing

Get the agency’s actual trading-terms agreements with media owners or its buying group, not a verbal summary of the margin they produce, and ask specifically whether those terms are tied to the current corporate entity, to a personal guarantee from the seller, or to volume commitments a new owner would need to requalify for independently. A margin figure that looks stable in the historical financials can evaporate the moment ownership changes if the underlying trading terms do not survive the transition.

Confirm who actually owns the creative and campaign IP

Campaigns, creative assets, brand assets built for clients and any proprietary tools or templates the agency uses internally all raise ownership questions that diligence needs to resolve explicitly — whether IP created for clients was properly assigned under the underlying contracts, and whether internally developed creative or production tools are actually owned by the agency rather than by a departing freelancer or contractor. A gap here can surface later as a client dispute or as a limitation on what the buyer actually acquired.

Regulated-category and influencer campaigns need their own file check

If any material client sits in a regulated category — alcohol, financial products, health claims, advertising to children — confirm the agency can produce records showing those campaigns went through whatever internal or client-side compliance review the category requires, and ask specifically about any complaint or adjudication a past campaign has faced. The same applies to influencer marketing, now a routine agency service: confirm the agency’s standard practice actually ensures the required paid-partnership disclosure appears on sponsored content it produces, since a disclosure failure creates liability that follows the campaign rather than staying with whichever contractor posted it. Neither finding is necessarily disqualifying, but a buyer who has not asked is inheriting an unknown.

• Termination clauses in every material agency-of-record contract, read directly rather than summarized
• Trading-terms agreements with media owners, and whether they are tied to the current entity or the seller personally
• Chain of ownership for creative, campaign and brand IP produced for clients and for internal use
• Employment terms and non-solicitation coverage for account leads and creative staff who hold key client relationships
• Any pending or past deceptive-marketing complaint or regulatory inquiry tied to a campaign the agency produced
• Compliance records for any regulated-category campaign, and evidence of the agency’s standard practice for influencer paid-partnership disclosure

Staff retention, tested rather than assumed

Because an agency’s production capacity is its people, confirm which account leads and creative staff hold the deepest client relationships, whether they are bound by any non-solicitation or non-competition terms, and — where the seller permits it — get a sense of their actual intentions around the sale. A departure of one or two key staff shortly after closing can undo much of what a buyer thought they were purchasing, and this is one of the harder findings to price precisely, which is exactly why it deserves direct attention rather than assumption.

Data, tracking and privacy obligations the agency has taken on

Agencies running digital and media campaigns commonly handle client customer data, ad-platform pixel and tracking data, and email or messaging lists on clients’ behalf, which means the agency has its own obligations under federal privacy law and anti-spam rules independent of what each individual client agreement says. Confirm the agency’s data-handling practices and any past incidents or complaints, since a privacy or data-security gap inherited at closing becomes the buyer’s exposure, not the seller’s.

What a finding actually means once you have it

Not every finding is a reason to walk away — a client contract without a strong termination clause, or a trading arrangement that needs renegotiation, is common and can often be priced into the deal through an adjustment, an earn-out or a holdback rather than treated as disqualifying. What matters is that the finding gets identified and addressed explicitly in the purchase agreement, rather than discovered for the first time after closing when the buyer has far less leverage to do anything about it.