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Australia ends 50-year era of voluntary merger review

Australia ends 50-year era of voluntary merger review

Rule Changes

Mandatory pre-approval regime puts companies on notice in global antitrust crackdown

January 1st, 2026: Mandatory Merger Control Takes Effect

Overview

For half a century, Australian companies could merge at will and simply inform regulators afterward. That ended January 1, 2026.

Now businesses must notify the Australian Competition and Consumer Commission before closing deals that meet certain thresholds—and wait for approval. Miss the requirement and your acquisition is automatically void, with penalties on top. The shift targets what regulators call 'creeping acquisitions'—serial buyers, especially private equity firms, rolling up competitors one at a time.

Australia joins the EU, US, and most developed economies in requiring mandatory pre-merger notification. The ACCC expects to decide 80% of cases within three weeks. The other 20% face deeper scrutiny in a country where regulators blocked major healthcare and toll road consolidations in recent years.

Play on this story Voices Debate Predict

Key Indicators

50 years
Duration of voluntary regime
Longest-running voluntary merger system among major economies
$200M
Combined revenue threshold
Minimum combined Australian revenue triggering mandatory notification
$250M
Transaction value threshold
Alternative global transaction value trigger for notification
80%
Fast-track decisions
Share of acquisitions ACCC expects to clear within 15-20 business days
3 years
Serial acquisition window
Lookback period for aggregating prior acquisitions by same buyer

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People Involved

Gina Cass-Gottlieb
Gina Cass-Gottlieb
Leading implementation of mandatory merger regime
 Rod Sims
Rod Sims
Initiated merger reform campaign

Organizations Involved

Australian Competition and Consumer Commission
Australian Competition and Consumer Commission
Federal Regulatory Agency
Primary enforcement authority under new regime

Australia's competition and consumer protection regulator with powers to review and block anticompetitive mergers.
Business Council of Australia
Business Council of Australia
Industry Association
Engaged in reform consultation with concerns about red tape

Peak body representing Australia's largest companies, advocating for business-friendly policy.
Law Council of Australia
Law Council of Australia
Professional Association
Expressed skepticism about regulatory discretion

National representative body for the Australian legal profession.

Timeline

April 2021 January 2026

11 events Latest: January 1st, 2026 · 5 months ago Showing 8 of 11
Tap a bar to jump to that date

  1. Mandatory Merger Control Takes Effect

    Latest Implementation

    Core regime launches: qualifying acquisitions now require ACCC pre-approval. Deals closed without clearance automatically void.

  2. Government Delays Asset Threshold Rules

    Policy Adjustment

    Treasury announces asset acquisition and control thresholds postponed to April 1, 2026, giving businesses more preparation time.

  3. Voluntary Notification Period Begins

    Implementation

    Companies can voluntarily notify acquisitions under new system during six-month transition period.

  4. Parliament Passes Merger Reform

    Legislative

    Senate approves bill with no amendments, ending 50-year voluntary merger review system.

  5. Bill Passes House of Representatives

    Legislative

    Treasury Laws Amendment (Mergers and Acquisitions Reform) Bill 2024 clears lower house with four Senate sitting days remaining.

  6. Treasury Laws Amendment Bill Introduced

    Legislative

    Government introduces merger reform legislation to Parliament; Senate Economics Committee given until November 13 to report.

  7. Major Healthcare Merger Blocked

    Enforcement

    ACCC prevents Australian Clinical Labs' acquisition of Healius, second- and third-largest pathology providers.

  8. ACCC Opposes Transurban Toll Road Acquisition

    Enforcement

    Regulator blocks Transurban's acquisition of Horizon Roads, citing entrenchment concerns in Victoria.

  9. Cass-Gottlieb Details Proposed Thresholds

    Policy Announcement

    ACCC Chair outlines monetary and market-share thresholds at National Press Club, emphasizing focus on 'mergers that matter.'

  10. Leadership Transition at ACCC

    Personnel

    Gina Cass-Gottlieb succeeds Rod Sims as ACCC Chair, continuing push for merger reform.

  11. ACCC Chair Sims Launches Reform Campaign

    Policy Advocacy

    Rod Sims publicly calls for mandatory merger clearance regime, arguing Australia's laws are 'flawed' and 'out of step' internationally.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

1976

US Hart-Scott-Rodino Act (1976)

The United States pioneered mandatory pre-merger notification with the Hart-Scott-Rodino Antitrust Improvements Act. Before 1976, US antitrust enforcement was purely reactive—agencies challenged deals after closing, often too late to unwind them. HSR required companies meeting size thresholds to notify the FTC and DOJ and wait 30 days before closing. Failure to file brought penalties exceeding $50,000 per day.

Then

Initial business resistance focused on compliance burdens and waiting periods for routine deals.

Now

Became global template for merger control. Regulators gained ability to investigate before deals closed, dramatically improving enforcement effectiveness. Nearly 50 years later, most developed economies operate similar mandatory notification systems.

Why this matters now

Australia's reform follows the HSR playbook exactly: shift from post-transaction challenges to pre-approval, cite enforcement gaps under voluntary system, promise fast clearance for non-problematic deals.

1989-2004

EU Merger Regulation (1989)

The European Commission gained merger control authority in 1989 as part of building the single market. Before that, member states handled merger review inconsistently. The 1989 regulation created mandatory notification for deals above specified turnover thresholds and suspensory rules—companies couldn't close until cleared. After the Commission lost court challenges in the early 2000s, it reformed the system in 2004 with more rigorous economic analysis.

Then

Businesses adapted to dual-track review: EU-level for large cross-border deals, national authorities for smaller domestic transactions.

Now

The EU regime became the world's most influential merger control system alongside the US. The 'more economics' approach from the 2004 reform set standards globally. Most countries adopting merger control since 1990 use EU-style mandatory notification with turnover thresholds.

Why this matters now

Australia's ACCC explicitly modeled its thresholds and two-phase review process on EU precedent. Cass-Gottlieb's goal: bring Australia from outlier to international norm.

2025

UK Digital Markets Act (2025)

On January 1, 2025, the UK implemented its most significant competition reform in 20 years. While maintaining a generally voluntary merger regime, the Digital Markets, Competition and Consumers Act created mandatory notification requirements for Strategic Market Status firms acquiring stakes above 15%, 25%, or 50% in targets exceeding £25 million value. The reform raised general CMA review thresholds from £70 million to £100 million and expanded the agency's investigative powers.

Then

The UK carved out a middle path: voluntary notification remains the default, but tech 'gatekeepers' face mandatory pre-approval for acquisitions.

Now

Test case for targeted mandatory notification focused on specific sectors and firm types rather than economy-wide thresholds. If successful, other jurisdictions may adopt hybrid models.

Why this matters now

Australia and UK moved simultaneously toward tighter merger control, but chose opposite strategies. UK targeted Big Tech while preserving voluntary filing. Australia went comprehensive mandatory notification. Both responded to the same concern: voluntary systems let problematic deals slip through.

Sources

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ACCC Clayton Utz White & Case Ashurst Gilbert + Tobin Global Competition Review Wikipedia Norton Rose Fulbright King & Wood Mallesons Law Council of Australia ICLG Journal of European Competition Law & Practice Ashurst Gilbert + Tobin