Omnicom merges Mediahub and Hearts & Science into a $9.1bn media network
- 5 days ago
- 3 min read
Updated: 3 hours ago
Omnicom is folding Mediahub and Hearts & Science into one global media network overseeing roughly $9.1bn in annual billings across 40 markets, launching in August 2026 — a sign that agency consolidation is accelerating and clients should expect fewer, bigger media partners.
Omnicom Media Group has confirmed it will merge two of its media agencies, Mediahub and Hearts & Science, into a single global network. The combined business is expected to launch in August 2026 with a new name and brand identity, and will span 40 markets overseeing approximately $9.1bn in annual billings, according to reporting from Marketing-Interactive and Campaign.
Nicole Estebanell, currently Mediahub's US chief executive, will lead the combined agency in the United States, while Ross Jenkins, who oversees Mediahub in EMEA, becomes regional chief executive for EMEA. Leadership for APAC and LATAM is expected to be revealed alongside the new brand. Notably, both agencies will continue to operate independently in Australia, with no change to how either runs locally.
Why Omnicom is consolidating now
Merging two mid-sized networks into one larger entity is about scale, simplicity and buying power. A single network with $9.1bn in billings can negotiate harder with media owners, invest more heavily in data and AI tooling, and present clients with one integrated offer rather than two overlapping ones. In an industry where holding companies are racing to rationalise their brand portfolios, duplication is expensive and increasingly hard to justify.
It also reflects the pressure agencies face from automation. As platforms push AI-driven, self-serve buying — from Google's Performance Max to TikTok's agentic tools — the value of a media agency shifts from manual execution toward strategy, data governance and cross-channel orchestration. Concentrating talent and technology in fewer, larger units is one way to defend that higher-value ground.
Marketing Minute's read: what it means for UK advertisers
For UK clients of either agency, the immediate priority is continuity of team and terms. Mergers are often framed as seamless, but they typically bring new reporting lines, revised scopes and, over time, changes to the people running an account. If your business sits with Mediahub or Hearts & Science, now is the moment to ask who owns your relationship after August, and whether your rate card and commitments carry over unchanged.
There is an upside worth pressing for. A bigger network should mean deeper first-party data partnerships, better access to connected TV and retail media inventory, and more robust measurement. Smart advertisers will treat the transition as leverage — a natural checkpoint to renegotiate scope, insist on transparency over AI and principal-media practices, and secure senior attention while the agency is keen to prove the merger has not diluted service.
The wider signal is the one UK marketers should not miss: the media-agency market is consolidating into fewer, larger players. That can sharpen capability, but it also narrows choice. For smaller and mid-market brands, it strengthens the case for keeping a nimble independent or in-house capability alongside any holding-company relationship, so you are never wholly dependent on a partner mid-restructure.
Quick FAQ
What are Mediahub and Hearts & Science?
They are two media agencies owned by Omnicom. Mediahub is known for challenger-brand, culture-led media, while Hearts & Science was built as a data-driven media agency. Omnicom is combining them into one global network of around $9.1bn in billings across 40 markets.
When does the merged agency launch?
The combined network is expected to launch in August 2026 under a new name and brand identity, with US leadership under Nicole Estebanell and EMEA under Ross Jenkins. Australia is excluded from the merger for now.
Should advertisers be worried about agency mergers?
Not necessarily, but they should stay alert. Mergers can improve scale and technology, yet they also bring reorganisation risk. Clarify your team, scope and commercial terms early, and use the transition to renegotiate transparency and service levels.
Every agency merger is sold as a win for clients, but the real winner is whoever asks the sharpest questions first. If your media partner is restructuring, treat it as a negotiation, not an announcement — lock down your team, your terms and your transparency before the new org chart locks you in.
— Daniel Nikolla, Founder of Merx Marketing
Consolidation concentrates capability and buying power, but it narrows your options — so protect continuity and use every merger as a moment to renegotiate.
Is your media agency getting bigger and harder to hold accountable, or sharper and easier to work with? We would love to hear your experience.
If you would like to know more about this topic, please contact us on danieln@merxmarketing.co.uk
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Written by Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
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