Omnicom is combining media agencies Mediahub and Hearts & Science into a single global powerhouse spanning 40 markets and ~$9.1B in billings.
Omnicom Media is combining two of its media agencies, Mediahub and Hearts & Science, into a single global network. <cite index="10-1">The merged network will span 40 markets and oversee roughly $9.1 billion in annual billings</cite>, positioning it as one of the more significant restructures inside Omnicom Media this year.
Why This Merger Is Happening
<cite index="6-1">The move follows Omnicom's acquisition of Interpublic Group and is part of a broader shake-up across its agency network</cite>. Mediahub originally came from the now-defunct IPG Mediabrands umbrella, while Hearts & Science has been a legacy Omnicom shop — so folding them together is a direct result of the two holding companies becoming one.
<cite index="5-1">Florian Adamski, chief executive of Omnicom Media, told staff the decision wasn't made overnight, describing the fit between the two agencies as "remarkably complementary."</cite> Both agencies, according to Adamski, share a similar founding philosophy centered on client growth and challenging convention.
Scale-wise, <cite index="5-1">Mediahub and Hearts & Science are currently the two smallest agencies within Omnicom Media in the UK, each employing 179 people as of the end of 2025</cite>. Combining them creates a business with real critical mass rather than two agencies competing for the same resources internally.
Who's Leading the New Entity
Leadership for the merged network is already being finalized market by market:
- UK: <cite index="5-1">Garrett O'Reilly, currently CEO of Hearts & Science UK, becomes UK CEO of the merged entity</cite>.
- US: <cite index="5-1">Nicole Estebanell, currently US CEO of Mediahub, becomes US CEO of the combined agency</cite>.
- EMEA: <cite index="5-1">Ross Jenkins, currently EMEA and APAC chief executive at Mediahub, becomes CEO for EMEA</cite>.
- APAC and LatAm: <cite index="5-1">Leadership for these regions is still being finalized</cite>.
Both agencies were built on the same principles — challenge convention, embrace innovation, and put client growth at the centre of every decision.
What Changes for Clients
For most markets, this is a back-end restructure rather than a client-facing overhaul. <cite index="9-1">An Omnicom Media spokesperson described the transition as "very much business as usual," with clients continuing to work with the same teams and leadership</cite>.
Australia is the one notable exception. <cite index="7-1">Omnicom confirmed the merger will not affect how either agency operates in Australia, where Mediahub and Hearts & Science will continue functioning as independent agencies under the existing local model</cite>. <cite index="7-1">The only change locally will be a refreshed brand identity for Hearts & Science</cite>, rolling out alongside the new global brand next month.
<cite index="4-1">Details of the new combined brand identity are expected to be revealed next month</cite>, and the new global name for the merged network hasn't been confirmed yet.
The Bigger Picture
This isn't happening in isolation. It's one piece of a much larger consolidation wave sweeping through the agency world right now — the same wave that produced the Omnicom-IPG deal in the first place. When two holding companies merge, their overlapping agency brands inevitably get rationalized, and media networks like Mediahub and Hearts & Science are exactly the kind of overlapping assets that get folded together first.
For agencies and marketers watching from the outside, the takeaway is simple: scale is consolidating fast at the top of the industry, and the agencies that survive these mergers are the ones with clearly complementary strengths rather than direct overlap. Worth watching how the new brand identity lands next month — and whether this becomes the template for how Omnicom rationalizes the rest of its overlapping IPG and legacy agency portfolio.
