The antitrust environment that killed deals in 2023 no longer exists. The one that replaced it looks permissive in Washington and assertive in Brussels — and operates at state level too.
Key figures:
4 — Significant US merger investigations in Q1 2026 — enforcement historically subdued
3 — Consent settlements in Q1 2026 — negotiated remedies fully revived under Trump administration’s second term
2 — States (Colorado and Washington) enacted mini-HSR premerger notification statutes in 2026
0 — Contested merger complaints filed by DOJ or FTC in Q1 2026
How Regulatory Fragmentation Is Reshaping Cross-Border M&A in 2026
Peter Dicken’s most counterintuitive claim about states as regulators is that they do not simply intervene in markets from outside — they constitute markets from within. The rules of competition, the enforcement of property rights, the regulatory frameworks governing corporate combination: these are not external constraints on a naturally occurring economic process. They are its preconditions. Change the regulatory architecture, and the nature of the market changes with it. In 2026, the regulatory architectures of the two most consequential M&A jurisdictions on the planet are operating simultaneously on opposite trajectories.
“The global M&A landscape in 2026 is defined by a fundamental tension.”
The Federal US Environment — Permissive but Structurally Unstable
Dechert’s DAMITT Q1 2026 report is precise: four significant merger investigations concluded in Q1 2026, zero contested merger complaints filed by either the DOJ or the FTC, and three consent settlements — a full revival of the negotiated remedy pathway that the Biden-era agencies had largely abandoned in favor of litigation. The Trump administration’s second-term antitrust agencies — FTC Chair Andrew Ferguson and, until his departure in February, DOJ Antitrust Division head Gail Slater — returned to traditional theories of harm and showed significantly less appetite for pursuing transactions through contested litigation. The February 2026 court decision vacating the Biden-era HSR amendments restored the less burdensome premerger notification form, and the administration reinstated early termination notices. The composite signal to dealmakers: transactions that would have faced contested litigation under the Biden FTC are navigating consent-oriented resolution. For most transactions in most sectors, the federal merger review environment in 2026 is the most permissive it has been in five years.
The structural instability caveat is material. Acting AAG Omeed Assefi, who assumed leadership of the DOJ Antitrust Division after Slater’s departure, has indicated he intends to continue Slater’s enforcement agenda but has suggested she was not aggressive enough in civil enforcement actions. Q2 2026 confirmed that merger timelines are shortening and the EU is updating merger guidance, per the July DAMITT report — but the DoJ leadership signal warrants monitoring for any transactions with a closing date beyond Q3 2026.
The European Environment — Assertive and Accelerating
While US federal enforcement decelerates, the European Union continues to apply its merger control framework vigorously to technology and digital economy transactions, and is advancing assertive digital regulation under the Digital Markets Act and the AI Act. The EU’s structural analysis methodology has not shifted toward the procompetitive benefit crediting that the US DOJ has demonstrated in recent closing statements. For any transaction with substantial EU and US nexus, the divergence is operationally consequential: the deal structure optimized for DOJ consent may not satisfy EC structural analysis, and the remedies acceptable to one authority may be insufficient for the other. Multi-jurisdictional strategy cannot be designed around a single regulatory environment and extrapolated to both.
The State-Level Environment — New, Expanding, and Undermodeled
Colorado and Washington enacted their own premerger notification requirements — “mini-HSR” statutes — in 2026, requiring parallel state filings for transactions meeting defined thresholds. Mondaq’s July 2026 antitrust update confirms that other states are actively considering similar measures. Simultaneously, state attorneys general pursued merger challenges in Q2 2026 where federal agencies declined to do so — a development the DAMITT Q2 report identifies as a continuation of the recent trend. For transactions operating across multiple US states in politically sensitive sectors — healthcare, energy, telecommunications, food and agriculture — state-level regulatory strategy has moved from an advisory footnote to a first-order deal-planning requirement. The federal clearance that a deal team celebrates at signing may face a state AG challenge that extends the closing timeline by quarters.
Three Regulatory Environments, One Transaction: The Strategic Implications
The 2026 antitrust environment is not one market. It is three simultaneous regulatory environments operating at different speeds, applying different analytical frameworks, and producing different outcomes on the same transaction depending on which regulator the deal is in front of. A multi-jurisdictional transaction that models only the federal US environment is underestimating its regulatory risk surface by at least two full dimensions. Three discipline shifts follow directly. Every M&A transaction with EU and US regulatory nexus requires a dual-strategy architecture from the term sheet stage — not a single remediation plan applied to both. Every transaction operating in multiple US states in a regulated sector requires a state AG risk map before announcement. And every transaction in a technology or data sector requires explicit modeling of the US federal permissiveness as a potentially temporary condition, not a durable structural shift.
The firms that have built multi-jurisdictional regulatory competency as a standard capability — rather than commissioning it transaction-by-transaction — will close faster, negotiate remedies more efficiently, and avoid the timeline surprises that the fragmented 2026 environment consistently produces for teams that still model regulatory risk as a single-jurisdiction question.
The bottom line: The 2026 antitrust environment is three regulatory environments operating simultaneously — federal permissive, EU assertive, and state AG activist. The deal team that has modeled all three will make better decisions than those that have modeled only one.
✍ STRATEGIC EXECUTION FOR GLOBAL DEALMAKERS
Multi-jurisdictional regulatory strategy — the practical discipline of managing federal US, EU, and state-level antitrust exposure on a single transaction — is the precise subject of the practitioner sessions at the 2026 Leadership in Dealmaking Summit, which opens September 14 at the New York Athletic Club. That is four days from today. The M&A Ideas Thought Leadership Sessions bring together the antitrust counsel, corporate development executives, and advisors managing these exact jurisdiction conflicts in their current transactions. The M&A Connects one-on-one platform creates the introductions between dealmakers and the regulatory practitioners who have built the multi-environment strategies this article describes.
Register now — join us on September 14:
https://events.maadvisor.com/2026LeadershipInDealmakingSummit
For faith-aligned institutional investors evaluating regulatory risk across their M&A-driven portfolio company positions, the governance framework for antitrust exposure is part of the stewardship conversation at the CatholicFi Summit on September 16 and 17 at the same venue.
Register for the CatholicFi Summit: https://catholicfi.com/register
Leave a Reply