Publicis Tells Clients to Drop The Trade Desk After Audit Reveals Fee Problems

Publicis Groupe is advising its clients to stop using The Trade Desk as a demand-side platform, following the results of a third-party audit that found the company had improperly applied fees. The recommendation, communicated via an internal email to select clients, marks the most significant rupture yet between The Trade Desk and the agency holding companies that route billions in programmatic spend through its platform.

Publicis is not a small client. According to Stifel analyst Mark Kelley, Publicis represents more than 10% of The Trade Desk's gross billings in both 2024 and 2025. The news sent TTD shares down 12% from their intraday peak on March 17.

What the Audit Found

Publicis confirmed to Adweek that the auditor was FirmDecisions, a well-known media and marketing contract compliance firm that is part of the Ebiquity Group. The audit examined The Trade Desk's fee structures and media and data spending.

The key finding: The Trade Desk "improperly applied their DSP fee to other fees" it charged Publicis and some of its clients for tools that they were automatically opted into — without providing evidence that the holding company or its clients authorized the addition of those purchases. In other words, the audit alleges that TTD was layering its platform fee on top of additional tool costs that clients had not explicitly agreed to.

Publicis also said The Trade Desk did not provide the auditor with the necessary information to validate that media and data costs were invoiced at cost — a standard transparency requirement in agency-DSP relationships.

The Trade Desk's Response

The Trade Desk squarely refuted the claims. "Any notion that TTD failed an audit is not true," a company spokesperson said. The company argued that the auditor requested data "that would violate customer and partner confidentiality agreements."

TTD management characterized the situation as part of ongoing negotiations involving differences of opinion with Publicis, specifically regarding its OpenPath product's role in addressing supply chain inefficiencies.

Publicis fired back, telling Ad Age: "At no point in this process did Publicis ask for the disclosure of any data or information that went beyond the audit agreement in place with The Trade Desk. None of the options proposed by The Trade Desk resolved the issues raised by the audit. As a result of the audit findings we will no longer be recommending The Trade Desk as a solution for our clients."

A Pattern: Dentsu and WPP Already Exited OpenPath

The Publicis dispute does not exist in isolation. Earlier this year, Dentsu and WPP quietly stepped back from The Trade Desk's OpenPath, a direct-to-publisher buying initiative TTD launched in 2022. OpenPath was positioned as a way for advertisers to buy inventory directly from publishers, bypassing intermediaries to improve transparency and reduce costs.

But agencies raised concerns about fee visibility, transparency, and clarity regarding ad placements. As Digiday reported, buyers estimated TTD applied a 10-15% premium on OpenPath transactions. Industry observers also noted a structural tension: OpenPath overlaps with services traditionally managed by agency trading desks, including supply-path optimization (SPO) and inventory curation. When a DSP starts offering SPO, it competes with the very agencies routing spend to it.

The Trade Desk's CMO Ian Colley defended OpenPath, saying "TTD doesn't push spend to OpenPath. It's not a marketplace or curated inventory. OpenPath is simply a supply path option to ad impressions that an advertiser would already be targeting." But for agencies whose business models depend on controlling supply-path decisions, that distinction may not matter — the perception of encroachment is enough.

What This Means for Programmatic Measurement

For measurement professionals, this dispute has several immediate implications:

Fee transparency affects measurement integrity. If DSP fees are being applied in non-transparent ways, the reported cost data flowing into attribution models, ROAS calculations, and MMM inputs is distorted. Every measurement framework that ingests platform cost data — which is most of them — depends on those costs being accurately reported. An audit finding that fees were improperly applied raises questions about the accuracy of cost-side data across the entire client base, not just Publicis.

Supply-path decisions are measurement decisions. Where ads are bought — through OpenPath, through SSPs, through curated marketplaces — affects everything from viewability rates to auction dynamics to the quality of conversion signals. When agencies shift spend away from a DSP, the measurement stack has to account for new supply paths, different auction mechanics, and potentially different signal quality.

The independent DSP model is under pressure. The Trade Desk built its business on being the independent, agency-friendly alternative to Google's DV360. That positioning depended on trust — agencies routed spend through TTD because they believed in the platform's transparency and alignment with buyer interests. Three of the six largest agency holding companies now have active disputes with TTD over transparency. That is an existential threat to the trust-based model.

Where Does the Spend Go?

If Publicis clients follow the recommendation and move spend off The Trade Desk, the most likely beneficiaries are:

The shift will also accelerate agency investment in curation platforms and SPO tools that give them more control over supply paths regardless of which DSP executes the buy.

Wall Street's Read

Analysts are split on whether this is a negotiating tactic or a genuine break:

The stock's 12% intraday drop — on top of an 80%+ decline from its all-time high — suggests the market is pricing in real revenue risk, not just negotiating noise.

The Bigger Picture

This is the most visible crack in the programmatic ecosystem's trust architecture since the ANA transparency reports that first shone a light on hidden fees in the programmatic supply chain. The common thread across Publicis, Dentsu, and WPP is not anti-TTD sentiment — it is a demand for auditable, verifiable fee structures in a supply chain that has historically operated on opacity.

For measurement teams, the takeaway is straightforward: the cost data feeding your models is only as good as the transparency of the platforms reporting it. If your DSP's fee structure cannot survive an independent audit, your ROAS and efficiency metrics are built on uncertain ground.