CLEAN Mergers Act

Bill Number

S. 4434

Origin Chamber

Senate

Congress

119th Congress, Session 2

Policy Area

Commerce

Status

Introduced

Latest Action

2026-04-29: Read twice and referred to the Committee on the Judiciary.

Last Updated

2026-05-21T15:28:04Z

AI-Generated Summary

CLEAN Mergers Act (S. 4434)

Purpose

This bill amends the Clayton Act (a key U.S. antitrust law) to require the breakup (divestiture) of very large corporate mergers completed during a specific four-year period (January 20, 2025, to January 19, 2029), unless they meet strict exemption criteria. It also enables government agencies and states to review and potentially unwind other mergers from that period if they involved enforcement irregularities, such as ignored staff advice, improper communications, or ethical violations, aiming to strengthen merger oversight and prevent weakened antitrust enforcement.

Key Provisions

• Definitions:
• Threshold transaction: Mergers valued at $10 billion or more during the covered period.
• Enforcement-lapse transaction: Any other merger during the period subject to premerger notification (under Clayton Act Section 7A).
• Agencies: Department of Justice (DOJ), Federal Trade Commission (FTC), Federal Communications Commission (FCC), Department of Transportation (DOT), and Surface Transportation Board (STB).
• HHI (Herfindahl-Hirschman Index): A measure of market concentration (higher values indicate less competition).

• Threshold Transactions (starting 180 days after enactment):
• Parties must fully divest (sell off) completed mergers or hold assets separate (keep independent) for ongoing ones during agency review.
• Exemptions possible via court declaratory judgment if: no excessive market concentration (HHI <1,800 or delta <100; market share <30%); no unjustified price hikes, output cuts, or job losses; full compliance with prior conditions; and no pro bono legal services from lawyers tied to settlements.
• State Attorneys General have unconditional intervention rights in court.

• Enforcement-Lapse Transactions (reviewable up to 2 years post-enactment):
• Agencies or state AGs can investigate for issues like: crimes (e.g., false statements, bribery); overriding career staff recommendations; incomplete investigations; improper ex parte (off-record) communications by political appointees/lobbyists; presidential/Cabinet influence; conflicts of interest; revolving-door hires; or foreign government interference.
• If issues found, agencies issue 30-day divestiture notice (full breakup within 180 days).
• Parties can seek court exemption by clear and convincing evidence that issues did not occur or were immaterial.
• State AG intervention rights apply.

• Evidence and Enforcement:
• Easier relevant market definition (no need for direct price/output evidence; defers to plausible industry submarkets).
• Mandatory preservation of all transaction-related records/communications (including ephemeral messages); non-compliance triggers adverse inferences, sanctions, and criminal referrals.
• States get record access on request.
• Non-divestiture penalties: court-appointed trustee for sales; daily fines up to $100,000 or 5% of deal value; treble (3x) damages for knowing violations; CEO/board fines; special counsel for federal crimes.
• Divestiture is the presumptive remedy (default); others (e.g., profit disgorgement) only if divestiture impossible.

• Other:
• Extends statute of limitations for private antitrust damages suits from 4 to 10 years.
• Severability clause preserves the law if parts are struck down.

Significant Changes to Existing Law

• Adds new Section 7B to Clayton Act, mandating automatic divestiture/hold-separate for $10B+ mergers in the covered period (previously, no such blanket rule).
• Introduces retrospective reviews for procedural flaws in merger approvals, with divestiture as a remedy (existing law focuses on prospective challenges).
• Presumes structural remedies (breakups) over behavioral fixes; simplifies market proof; imposes strict recordkeeping with harsh penalties.
• Lengthens damages suit timeline (Clayton Act Section 4B).

Potential Impacts

• Government Agencies: Empowers DOJ/FTC/etc. with new review/divestiture tools and special counsel for crimes; increases workload for 2025-2029 deals but streamlines market analysis.
• Citizens/Consumers: Could reduce market concentration, potentially lowering prices and boosting competition in affected industries.
• International Relations: Targets foreign influence (e.g., state-owned firms, agents), possibly scrutinizing cross-border deals more aggressively.
• No direct citizen burdens; focuses on corporate compliance costs.

Main Stakeholders Affected

• Merging Companies: Especially large firms in $10B+ deals (2025-2029); face divestiture risk, recordkeeping burdens, fines.
• Antitrust Agencies: Gain enforcement authority but must justify reviews.
• State Attorneys General: Enhanced intervention and review powers.
• Lawyers/Lobbyists/Political Appointees: Restrictions on pro bono, revolving-door ties, communications; sanctions for non-compliance.
• Consumers/Workers: Indirect benefits via preserved competition, jobs, output.
• Foreign Entities: Sovereign funds/agents face influence bans.

Notable Legal, Constitutional, or Political Implications

• Legal: Shifts burden to companies for exemptions (clear and convincing standard); presumes divestiture as remedy, easing government wins; adverse inferences strengthen discovery (like spoliation rules).
• Constitutional: Targets a specific presidential term (covered period aligns with potential 2025-2029 administration), raising equal protection or separation-of-powers questions if seen as politicized; severability mitigates risks.
• Political: Enables overriding past approvals via career staff input or political influence probes; extends private suits, aiding plaintiffs like consumers/states. Neutral on merits—focuses on process integrity.

This summary was generated by AI and may contain inaccuracies. Refer to the official source document for the authoritative text.

Sponsor

Sen. Booker, Cory A. [D-NJ]

Cosponsors (4)

Sen. Warren, Elizabeth [D-MA], Sen. Heinrich, Martin [D-NM], Sen. Murphy, Christopher [D-CT], Sen. Hirono, Mazie K. [D-HI]

Recent Actions

• 2026-04-29: Read twice and referred to the Committee on the Judiciary.
• 2026-04-29: Introduced in Senate

Bill Versions

• Correcting Lapsed Enforcement in Antitrust Norms for Mergers Act — issued 2026-04-29 — PDF (15 pages)