By Vanguard Law & Governance Unit with the work of Lina Khan, Jonathan Kanter, Fiona Scott Morton, Herbert Hovenkamp, and Eleanor Fox.

The New Antitrust Operating Environment

Antitrust law has entered a more fragmented and strategic phase. For much of the modern corporate era, executives could treat competition review as a largely federal, transaction-specific process. A merger triggered Hart-Scott-Rodino filing obligations. Counsel evaluated market concentration, customer overlaps, pricing effects, and possible remedies. Business collaborations were reviewed for competitor coordination risk. International deals were managed through parallel merger filings in major jurisdictions.

That model is no longer sufficient.

In 2026, antitrust risk is broader, more political, more jurisdictionally fragmented, and more connected to questions that extend beyond price and market share. State attorneys general are more assertive. State-level premerger notification laws are expanding. ESG and sustainability collaborations are being scrutinized through an antitrust lens. Cross-border deals are increasingly affected by industrial policy, national security, digital regulation, supply-chain resilience, and geopolitical alignment. Regulators are paying closer attention to data, artificial intelligence, labor markets, private equity roll-ups, healthcare consolidation, platform power, and serial acquisitions.

The result is not simply tougher enforcement. It is less predictable enforcement.

For boards and general counsel, the central challenge is to pursue growth while managing a competition-law environment that now moves on several tracks at once. A transaction may clear federal review and still face state opposition. A sustainability initiative may be commercially and reputationally valuable but invite allegations of coordinated market behavior. A cross-border acquisition may be attractive strategically but encounter different theories of harm in Washington, Brussels, London, Beijing, or state capitals. A collaboration that appears procompetitive in one jurisdiction may be treated with suspicion in another.

Antitrust has become part of enterprise strategy. It now shapes deal timing, partnership design, public messaging, investor expectations, and board risk oversight. Companies that still treat it as a late-stage legal clearance issue will face unnecessary friction. Companies that integrate antitrust thinking into strategy formation will have more room to grow.

What Has Changed

The first shift is the rise of state enforcement. State attorneys general have always played a role in competition policy, but their role has become more independent and more consequential. States are increasingly willing to investigate mergers, challenge transactions, pursue conduct cases, and continue litigation even when federal agencies settle or decline to act. They are also focused on local effects: store closures, employment, healthcare access, consumer prices, regional concentration, and community impact.

This matters because national market analysis may not be enough. A deal that appears manageable under a federal market-definition framework may still raise state-level concerns if it affects local customers, workers, suppliers, patients, or small businesses. The failed Kroger-Albertsons transaction showed the power of state enforcement in a high-profile merger involving grocery markets, labor, pricing, and community access. It also showed that state cases can impose real deal risk even when companies are prepared for federal scrutiny.

The second shift is the growth of state premerger notification laws. Washington and Colorado enacted broad mini-HSR regimes, and California followed with its own Uniform Antitrust Premerger Notification Act, effective in 2027. These laws generally require parties that submit federal HSR filings and meet state nexus requirements to provide copies or related notice to state attorneys general. The practical effect is greater early visibility for state enforcers.

For deal teams, this changes the pre-signing and pre-filing analysis. State review is no longer a secondary issue that appears only if a transaction becomes controversial. It may be built into the notification architecture from the beginning. Companies must evaluate where the parties operate, where employees and customers are located, which states may claim interest, and whether local political or economic factors could affect the review.

The third shift is the uncertain federal posture. The FTC and DOJ remain active, but the enforcement environment has evolved with changes in administration, leadership priorities, litigation outcomes, and agency resources. The agencies have sought public comment on updated guidance for business collaborations, signaling that competitor partnerships remain an important focus. At the same time, courts, political oversight, and business challenges continue to shape how far the agencies can go.

The fourth shift is the globalization of antitrust risk. Cross-border deals face competition review in multiple jurisdictions, but the analysis increasingly intersects with national security, industrial policy, foreign subsidies, technology sovereignty, and supply-chain concerns. A deal involving semiconductors, cloud infrastructure, artificial intelligence, defense, energy, or sensitive data may not be evaluated only as a merger. It may be evaluated as a strategic control question.

The fifth shift is the politicization of ESG-related coordination. Sustainability initiatives, climate commitments, industry standards, and investor coalitions were once often framed as governance or reputational projects. They are now also being examined as possible restraints on competition. Republican state attorneys general have challenged climate-related investor coordination, while companies remain under pressure from other stakeholders to demonstrate credible environmental and social commitments. This creates a difficult balance: companies may face risk for doing too much collectively and risk for doing too little substantively.

Why ESG Became an Antitrust Issue

The antitrust concern around ESG is not that environmental or social goals are inherently unlawful. Companies may pursue sustainability, emissions reduction, ethical sourcing, workforce standards, and responsible investment policies. The legal concern arises when competitors coordinate in ways that may restrict output, reduce investment, raise prices, limit supply, exclude rivals, or standardize business conduct beyond what is necessary to achieve legitimate objectives.

A climate initiative can become problematic if it involves competitors agreeing to reduce production, limit financing, boycott certain customers, restrict supply, or adopt uniform commercial terms. An industry standard can raise concern if it operates as a barrier to entry or excludes companies that cannot meet the standard. An investor coalition can attract scrutiny if it appears to coordinate pressure across portfolio companies in a way that affects competition.

The difficulty is that many ESG problems are collective-action problems. Climate risk, supply-chain labor standards, human rights due diligence, and industry-wide emissions reporting often require coordination, shared metrics, and common frameworks. But antitrust law is cautious about coordination among competitors, even when the stated purpose is socially beneficial.

This tension does not require companies to abandon ESG. It requires a more disciplined approach.

Companies should distinguish unilateral action from coordinated action. They should document the procompetitive rationale for any collaboration. They should avoid discussion of prices, output, capacity, market allocation, customer restrictions, or competitively sensitive strategy. They should ensure that standards are voluntary, transparent, objective, and open where appropriate. They should use counsel to structure industry initiatives and maintain clear agendas, minutes, and participation rules.

The strongest ESG strategy in 2026 is not performative coordination. It is independently governed, commercially grounded, legally structured action.

The Cross-Border Deal Challenge

Global merger control has become more complex because jurisdictions increasingly view competition through different institutional lenses.

In the United States, regulators may focus on concentration, labor effects, vertical foreclosure, data access, platform power, private equity roll-ups, and potential competition. State enforcers may focus on local market effects and community impact. In the European Union, merger control may intersect with the Digital Markets Act, foreign subsidies review, industrial policy, and data-driven competition concerns. In the United Kingdom, the Competition and Markets Authority has shown a willingness to scrutinize technology, digital markets, and dynamic competition. In China, merger review can be influenced by domestic industrial priorities, supply-chain sensitivity, and broader geopolitical conditions.

For companies, this means that a single deal thesis may require multiple antitrust narratives.

A merger presented to U.S. agencies as efficiency-enhancing may need to be explained in Europe through innovation, interoperability, or access commitments. A transaction involving data may require privacy, cybersecurity, and competition arguments. A supply-chain deal may need to address resilience without appearing to foreclose rivals. A joint venture involving strategic technology may need to satisfy both antitrust and national security expectations.

The problem is not only legal. It is operational. Different jurisdictions move at different speeds, require different information, and may create inconsistent remedy demands. A remedy accepted in one jurisdiction may not satisfy another. A divestiture package may raise buyer-suitability questions. Behavioral commitments may be viewed as insufficient. In some sectors, regulators are skeptical that remedies can preserve competition if the structure of the transaction itself changes market incentives.

This creates a new imperative for deal planning: antitrust strategy must be global from the first draft of the transaction rationale.

Three Scenarios for 2026

The first scenario is fragmented escalation. In this scenario, federal U.S. enforcement remains active but uneven, while state attorneys general become the decisive source of risk in certain sectors. Healthcare, grocery, housing, labor markets, digital platforms, algorithmic pricing, and local services become especially exposed. Companies may find that federal clearance does not end the review. State litigation, political pressure, or local remedies may still affect timing and feasibility.

The second scenario is strategic moderation. In this scenario, agencies continue enforcement but courts constrain more aggressive theories. Companies gain some clarity, but the cost of review remains high because regulators expect more documents, more data, and more detailed explanations. Deals continue, but only the most prepared companies move efficiently. Antitrust risk becomes less about whether enforcement is “tough” or “light” and more about whether companies can present credible evidence early.

The third scenario is geopolitical divergence. In this scenario, cross-border transactions become harder to close because competition review interacts with national security, industrial policy, and technology control. Deals in AI, cloud infrastructure, semiconductors, energy, defense, and strategic data face multi-agency scrutiny. Companies must manage not only antitrust risk but also political legitimacy across jurisdictions.

All three scenarios are plausible. The common theme is that antitrust risk becomes more integrated with business strategy.

The General Counsel’s New Role

The general counsel’s role in antitrust strategy has expanded. Historically, counsel often entered when a transaction was already being evaluated or when a collaboration was being documented. In the current environment, that is too late.

General counsel should be involved when management first considers acquisition strategy, market expansion, pricing architecture, data partnerships, sustainability collaboration, supplier alliances, platform rules, or competitor-facing industry initiatives. Antitrust risk is now embedded in growth choices, not merely in legal documents.

The general counsel should also become a translator between regulators and business leadership. Antitrust agencies do not evaluate only legal theories. They evaluate business incentives. They ask what the company will be able to do after the transaction that it could not do before. They ask whether customers, workers, suppliers, advertisers, hospitals, retailers, or developers will have fewer choices. They ask whether the company’s documents reveal a strategy inconsistent with the public deal rationale.

That last point is critical. Internal documents remain one of the most important sources of antitrust risk. A transaction described externally as procompetitive may be undermined by internal emails celebrating pricing power, reduced capacity, elimination of a disruptive rival, labor leverage, or the ability to control access. In a more aggressive enforcement environment, document discipline is not cosmetic. It is central to credibility.

A Playbook for Resilient Antitrust Strategy

Companies should begin with antitrust-by-design. Deal teams should assess competition risk before signing, not after. That assessment should include market overlaps, vertical relationships, labor effects, state-level exposure, customer concentration, data access, potential competition, supply-chain effects, and likely regulator narratives. The objective is not to kill deals prematurely. It is to identify the evidence needed to defend them.

Second, companies should build a state enforcement map. For any significant transaction, counsel should identify states with operations, employees, customers, suppliers, facilities, political sensitivity, or statutory notice requirements. The company should anticipate which attorneys general may care about the deal and why. Local effects should be analyzed with the same seriousness as national market shares.

Third, companies should prepare a deal narrative grounded in evidence. Regulators are skeptical of generic efficiency claims. Companies should be able to explain why the transaction improves competition, expands capacity, strengthens innovation, increases service quality, protects supply reliability, or enables investment that would not otherwise occur. Those claims should be supported by documents, data, and business realities.

Fourth, companies should design collaborations carefully. Competitor collaborations can be valuable in research, standard-setting, cybersecurity, sustainability, logistics, safety, and interoperability. But they require governance. Participation rules, information-sharing protocols, antitrust counsel attendance, written agendas, clean-team structures, and limits on competitively sensitive information are essential.

Fifth, companies should treat ESG initiatives as antitrust-sensitive. Sustainability goals should be pursued through independent decision-making whenever possible. When collaboration is necessary, it should be narrowly tailored, voluntary, transparent, and supported by a legitimate efficiency or risk-management rationale. Companies should avoid any suggestion that ESG objectives justify agreements to limit competition.

Sixth, companies should integrate antitrust with national security and geopolitical review. A cross-border transaction may require simultaneous strategy for antitrust, CFIUS, export controls, sanctions, foreign subsidies, data localization, and sector-specific approvals. These reviews cannot be managed in isolation. Commitments made to one regulator may affect another.

Seventh, companies should stress-test remedies before offering them. Divestitures, access commitments, firewall obligations, supply agreements, and behavioral remedies all have execution risk. Regulators increasingly ask whether remedies will work in practice, whether buyers are capable, and whether competition will be preserved over time. Companies should not assume that a remedy will cure a transaction if the underlying competitive concern is structural.

Managing Growth Without Freezing Strategy

The goal of antitrust strategy is not risk avoidance at all costs. Companies still need to grow. Mergers, joint ventures, supplier alliances, licensing arrangements, data partnerships, and industry collaborations can all create real value. In fragmented markets, consolidation may improve investment capacity. In technology markets, partnerships may accelerate innovation. In sustainability, collaboration may help solve problems that no single company can address alone.

But growth strategies must now be designed with more care.

Executives should ask four questions before pursuing a transaction or collaboration. First, what is the competitive theory of value? Second, what is the regulator’s likely theory of harm? Third, what evidence supports the company’s position? Fourth, how would the strategy look if internal documents, board materials, and public statements were reviewed side by side?

That fourth question is often decisive. Antitrust risk increases when a company’s internal logic and external explanation diverge. If executives privately describe a deal as eliminating competition but publicly describe it as increasing efficiency, the legal risk is obvious. If a collaboration is marketed as sustainability but operates as coordinated output reduction, the risk is substantial. If a data-sharing arrangement is framed as customer benefit but creates exclusionary access barriers, regulators will focus on the practical effect.

The best antitrust strategies are aligned. The business rationale, legal analysis, documentary record, investor messaging, and operational plan all tell the same story.

The Board Agenda

Boards should treat antitrust as part of strategic risk oversight. This does not mean directors should manage filings or legal arguments. It means they should understand where competition risk intersects with the company’s growth model.

The board should ask management to identify the company’s antitrust exposure across mergers, acquisitions, pricing practices, data use, labor practices, competitor collaborations, ESG initiatives, supply-chain agreements, and platform rules. It should ask whether the company has an antitrust compliance program that reflects current risks rather than legacy training. It should ask whether deal documents and board materials are reviewed for accuracy and competition-law sensitivity. It should ask whether state enforcement and global review are included in transaction planning.

For companies in sensitive sectors, the board should also ask whether antitrust risk overlaps with national security, political scrutiny, or public-interest concerns. Healthcare, grocery, housing, energy, technology, defense, media, and financial services are not reviewed only as abstract markets. They are reviewed as systems that affect communities, workers, consumers, and public priorities.

The board’s most important contribution is discipline. It should ensure that management does not treat antitrust as a clearance obstacle to be managed after strategy is set. Antitrust should inform strategy before commitments are made.

The New Competitive Discipline

The antitrust landscape in 2026 is not defined by one dominant theory. It is defined by flux. Federal agencies remain important, but states have become more assertive. ESG remains commercially significant, but coordination risk is rising. Cross-border transactions remain possible, but geopolitical review is more complicated. Collaboration remains valuable, but information-sharing and competitor conduct require tighter controls.

The companies that navigate this environment best will not be the most cautious. They will be the most prepared.

Preparation means knowing where growth creates competition risk. It means building state-level analysis into merger planning. It means designing ESG initiatives that advance legitimate goals without creating coordination exposure. It means aligning internal documents with real business rationale. It means treating antitrust, national security, data governance, and public-interest concerns as connected rather than separate.

Antitrust law is changing because competition itself is changing. Markets are more digital, more global, more concentrated in some sectors, and more politically salient. Regulators are responding not only to price effects but to control over data, workers, platforms, supply chains, essential services, and strategic technologies.

For executives, the implication is clear: antitrust is no longer a late-stage legal review. It is a strategic discipline.

Growth remains possible. Collaboration remains possible. ESG remains possible. Cross-border transactions remain possible. But each requires a stronger governance architecture than before. The companies that build that architecture will preserve strategic flexibility. The companies that rely on outdated assumptions will find that the cost of growth rises when antitrust risk is discovered too late.