What happened in agency consolidation, and when?
Agency consolidation, in 2025 and 2026, means Omnicom buying Interpublic and WPP rebuilding itself as one company. This guide is for marketing leads whose agency sits inside either group. After reading you can check whether you own your ad accounts and data, and decide which work to keep renting.
Omnicom bought Interpublic, which it completed on 26 November 2025, with pro forma combined revenue, per its closing release, "in excess of $25 billion". WPP, under its Elevate28 plan of 26 February 2026, is turning itself from a holding company (a parent that owns many separately run agency brands) into a single company.
Both reorganisations run on the agency's timetable and for the agency's reasons. Your account sits inside them whether or not anyone tells you. Deciding which work to keep renting is an AI marketing strategy question as much as a vendor one.
Is agency consolidation a cost story or a capability story?
Agency consolidation is both, and the cost side has the firmer dates. Omnicom's savings target was $750 million a year per the deal announcement of 9 December 2024. On 18 February 2026, its full-year 2025 results report doubled that to $1.5 billion, including $900 million in 2026.
The groups also sell capability. On 28 July 2026 Omnicom's chief executive, John Wren, said: "Clients are consolidating more work with us because they see the competitive advantage our connected capabilities deliver." WPP's chief executive, Cindy Rose, set out her aims at the Elevate28 launch: "Our intention is to stabilise the business, return to organic growth, create capacity to invest in the future and deliver attractive returns for our shareholders."
Both statements can be true at once. What a client can check today is the cost side, so read the published numbers with their fine print attached:
| Signal | Omnicom (with Interpublic) | WPP |
|---|---|---|
| Savings target | $1.5 billion a year, including $900 million in 2026 | £500m of gross annualised savings by 2028; cash cost about £400m, phased over two years |
| Where savings come from (company wording) | Q2 margin rise "primarily due to cost reduction synergies" | "operating model changes, deduplication of support functions and real-estate/long-tail efficiencies" |
| Latest hard number | Core Operations Adjusted EBITA margin 17.8% in Q2 2026, from 15.9% | 97,388 people at 30 June 2026, from 104,083 a year earlier; staff costs down 5.9% in H1 |
| Fine print | Non-GAAP figure. The 2025 base combines Omnicom and Interpublic. Severance-led repositioning costs are excluded | Headcount was already 98,655 at 31 December 2025. Incentive costs rose to £130m from £59m |
| Platform named | Omni, which "will power all capabilities" | WPP Open, its operating platform |
| What it does not tell you | Who stays on your account, which entity holds your contract, and whether your access changes | |
Two things follow. Omnicom's Q2 release says the adjusted margin excluded repositioning costs "primarily related to severance actions" tied to the acquisition, so people are leaving. WPP's interim results show most of its fall in headcount happened before 2026, and it says £100m of 2026 savings is on track.
Some of the people who leave may be on your account. Neither group can promise in advance which ones, so plan as if it could be yours. Treat any consolidation-driven change on your account as a cost event until someone shows you, in writing, what you gain: a named senior person on your business, say, or a data access right you did not have before.
What changes for a brand-side team when its agency group reorganises?
Four things can move on the client side: the people, the contracting entity, system access and the agency's priorities. Each change is small, which is why it tends to go unescalated.
People. The strategist who knew why your brand search advertising campaign is split the way it is may be reassigned or merged into a regional team. The reasons behind your account structure usually leave with them, because nobody wrote them down.
Entities and contracts. When agency brands are folded together, the legal entity you signed with can change. Your master services agreement (the umbrella contract) may be novated, meaning transferred to a new entity. A novation can keep every term or quietly change some, so treat each letter as capable of changing the deal and have counsel read it against the original (operator guidance, not legal advice).
Systems and access. Integration usually moves teams onto shared platforms. Ad accounts, analytics properties and tag containers can be migrated or re-permissioned along the way. If your Google Ads accounts sit under the agency's manager account (the parent login that controls several client accounts), you do not control that migration.
Priorities. WPP calls 2026 its "Stabilise" year. A group in that phase is managing margin, so expect pressure toward its own platforms and production units, and less appetite for bespoke work.
Where you sit changes the texture. In Singapore and Malaysia, one regional hub team often serves several markets, so one reassignment can touch several countries at once. In the US and Canada, larger local teams soften single departures but add more contracts and entities to check. Australia often sits in between.
What should you protect before your agency roster changes?
Protect ownership first. Every ad account, analytics property, audience, creative source file and billing line should sit with the brand before any roster change. The painful transitions tend to come down to one discovery: something the brand assumed it owned was held by the agency.
Check your contract before you act
Before you request exports or ask the agency to pause account changes, read your master services agreement for who owns the accounts, the data and the creative. If it says the agency owns something, negotiate the handover rather than taking it. This is operator guidance, not legal advice; have counsel review any ownership or data clause.
Tick each row where the "protected" column is already true for you, then score it. The table reads fully without the button.
| Asset | What "protected" looks like | First action if not |
|---|---|---|
| Under your own manager account or business portfolio; agency has partner access only | List every account ID, its owner and every admin | |
| Brand-owned, with at least two named brand-side admins | Add two brand admins; export change history | |
| Customer lists and conversion connections run from brand-owned systems, consent basis documented | Inventory every audience and where its raw data lives | |
| Contract assigns rights on payment; layered files and licences delivered | Request source files for the last 24 months of live creative | |
| You know which buys are in your name and which are pooled | Ask for a written list of live commitments and who holds each | |
| Platforms invoice the brand; credentials in a brand password manager | Map every billing relationship and card on file | |
| Naming conventions, test log and change history held by the brand | Ask for the test log and the reasons behind the structure, in writing |
Scoring rule: 0 rows missing, routine. 1 or 2 missing, fix them this week. 3 or more missing, treat it as urgent and fix access before any strategy discussion.
A regional insurer runs Google Ads, Meta and LinkedIn in Singapore, Malaysia and Australia: 9 ad accounts, plus 3 GA4 properties and 2 tag containers, so 14 assets to check. The audit finds 4 ad accounts where every admin is an agency employee, and 1 billed on the agency's card.
Those 5 go to the top of the week's list. The other 9 only need a second brand-side admin, about an afternoon's work. On the table above, this insurer fails two rows (ad accounts and billing), so it is "fix this week", not urgent.
An agency roster in flux: the 30/60/90-day checklist
Use this when your agency's parent announces a merger or restructure, or your account lead changes without warning. It assumes you are not switching yet. Most brands should not switch in the first 90 days: get control back, then decide calmly.
Do this first
Add two brand-side admins to every ad account, analytics property and tag container. It costs an afternoon and fixes the most common failure: the only admin is an agency employee who has since left.
Secure and see
- Run the ownership audit above.
- Ask in writing which legal entity will hold your contract after the change, and who your named team is for the next two quarters.
- Ask to be notified before any structural account change (migration, re-parenting, new manager accounts), within what your contract allows.
- Request 24 months of performance data, the test log and change history for the data your contract says you own.
Measure what you are getting
- List who worked on the account six months ago and who works on it now.
- Set service thresholds, for example turnaround on a creative revision and a monthly note on what was tested.
- Separate platform-reported results from what your own data confirms. If you have never run a holdout test (a group deliberately not shown ads), start one.
- Read any novation letter or revised statement of work line by line against the original.
Re-decide the model
- Score each workstream on two questions: does it need to compound inside the company, and has AI changed what it costs?
- Decide per workstream: keep, bring in-house, move to a specialist, or automate. The table below gives defaults.
- If anything moves, run old and new in parallel for one full reporting cycle before cutting over.
Performance can hold up for months on autopilot while ownership problems compound quietly. That is why the audit score, not this quarter's results, sets the urgency.
After agency consolidation, what should stay in-house, go to specialists, or move to AI?
Keep judgment and ownership of marketing analytics and insights in-house, and rent execution where renting is cheaper. One test sorts most workstreams fast: if the agency lead on it left tomorrow, could anyone on the brand side explain why it is set up the way it is? If nobody could, that workstream moves up the review list.
A disclosure before the table. Leapbuzz sells operating-model reviews, so read the defaults sceptically. The audit and the checklist above work the same whoever you hire, including nobody.
| Workstream | Default home | Why | Move it if |
|---|---|---|---|
| Strategy and budget allocation | In-house, with outside challenge | Decisions about where money goes should build knowledge inside the company | You have no senior marketer; borrow judgment for a fixed period |
| Measurement and first-party data | In-house ownership, specialist build | The brand has to defend the number to its own board | Never outsource ownership; outsource the build if you lack it |
| Search and paid social execution | Specialist or in-house | Platform automation cut the manual work; what remains is account structure and testing | Spend is small enough for one skilled in-house operator |
| Large-scale media buying | Scaled buyer | Scale still matters for some inventory, especially offline and video | Most spend is in self-serve auctions |
| Brand platform and big ideas | Creative partner | Hard to hire for, easy to lose by committee | Your category runs on volume more than ideas |
| Creative versioning and first-draft copy | AI tooling with in-house review | Variants are cheaper to make than they were; review and brand approval are not | You are in a regulated category without a documented approval path |
| Reporting assembly | Automated | A weak place to pay agency rates once data lives in one place | Your data is fragmented; fix that before automating the deck |
In insurance marketing and banking, the approval path has to exist before the AI tool does. Agree it with compliance first. We went deeper on that for insurers in insurance marketing consultancy vs agency, for search in do you still need a Google Ads agency, and on the wider build-or-buy choice in choosing a marketing operating model.
Timing decides the next step. WPP plans a "Build" phase for 2027 per its strategy update, and Omnicom has $900 million of its savings aimed at 2026. Both overlap the weeks when most brands write their 2027 plans. Run the ownership audit and send the Day 30 questions before your 2027 planning brief goes to any agency.