Adtech + Martech Mergers Surge: What This Means for the Industry

Adtech and martech M&A ran hot through 2025, roughly 465 deals, up 13% on the year. It’s cooled since, and what’s left standing after the slowdown says more about where the industry is actually headed than the deal count itself.

2025 was a genuinely busy year for adtech and martech M&A. What’s happened since is the more instructive part: deal volume cooled meaningfully in early 2026, and the deals that kept closing tell a clearer story about where real capability gaps sit than the raw 2025 deal count ever did.

The distinction worth holding onto throughout: a high deal count in a hot market tells you capital is available. Which specific deals still get done once that market cools is a much better signal of which capabilities buyers consider genuinely non-negotiable, since those are the acquisitions that survive tighter scrutiny and a smaller pool of willing capital.

The 2025 wave, in real deals

M&A activity across martech, adtech and digital content ran to roughly 465 deals in 2025, up 13% on the prior year, according to Luma Partners. Named transactions from the period include Mediaocean’s $500 million acquisition of Innovid to strengthen its connected TV measurement capability, Publicis Groupe’s acquisition of influencer marketing platform Captiv8, DoubleVerify’s acquisition of OpenSlate to expand brand safety and contextual verification, and LiveRamp’s acquisition of Habu to bolster its data clean room and collaboration capability. The pattern across nearly all of them: buyers weren’t acquiring scale for its own sake, they were acquiring specific, narrow capability gaps, measurement, verification, data collaboration, that would have taken years to build internally.

The 2026 slowdown, and why it happened

The headline change since: Q1 2026 saw broader martech deal volume decline roughly 14% against the prior quarter, with the largest, scaled transactions down even more sharply, even as adtech-specific deal count held up better on a pure numbers basis. The cooling coincided with, and was likely reinforced by, the wider disruption covered in The Role of Adtech in the Privacy Sandbox Era: Google’s reversal on cookie deprecation and the October 2025 Privacy Sandbox shutdown removed a major forcing function that had been pushing identity-adjacent M&A activity for years. With the “prepare for a cookieless web” urgency gone, some buyers appear to have paused rather than accelerated.

Where buyer focus actually concentrated

Even through the slowdown, the deals that did close concentrated hard on three capability areas: incrementality measurement, identity resolution, and AI-driven performance optimisation. The clearest single example is The Trade Desk’s acquisition of Sincera, a supply chain transparency data company, a direct bet on solving the same transparency problem that’s run through the SSP fee disclosures covered in Unraveling the SaaS Proposals of Magnite and PubMatic and the OpenPath transparency concerns covered in Disputing the “Dumb Pipes” Theory. The through-line across 2025 and into 2026: capital moved toward buying transparency and measurement capability outright, not toward scale for its own sake.

What this means for the next 12 months

Two planning implications worth taking seriously. First, the specific capability gaps buyers are paying to close, identity resolution, incrementality measurement, supply chain transparency, are the same gaps most individual businesses are trying to solve internally, which means the build-versus-buy calculus covered in Our Guide To Making Wise Marketing Technology Investments deserves a genuine, current look rather than an assumption that internal build is always cheaper. Second, a cooling deal market doesn’t mean cooling appetite, it means buyers are being more selective about exactly which capability gap justifies the price, which is a reasonable standard for any business evaluating its own technology roadmap too.