Stéphane Dionnet

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Stéphane Dionnet has over 20 years of experience practicing international competition law, and has experience liaising with competition authorities in the European Union, United States and Asia. Stéphane has advised global corporations on how to navigate complex multijurisdictional merger control matters. He has represented clients in numerous cartel investigations and has also successfully assisted companies in obtaining conditional immunity from the European Commission and other competition law agencies in and outside the European Union. Read Stéphane Dionnet's full bio.

New Developments in French Competition Law Pose Risk of Ex-Post Challenge to Non-Notifiable Transactions


By , and on Jun 5, 2024
Posted In Agriculture, EC Developments, EU Developments, French Developments, Mergers & Acquisitions

In a significant development for French merger control, on May 2, 2024, the French Competition Authority (FCA) applied the jurisprudence laid down in the recent Towercast case to an alleged anticompetitive agreement matter in the meat-cutting sector. In its Towercast ruling (C-449/21), the Court of Justice of the European Union (CJEU) held that a merger...

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Antitrust M&A Snapshot | Q1 2024


By , , , , , and on May 2, 2024
Posted In Cartel Enforcement, DOJ Developments, EC Developments, EU Developments, FTC Developments, Healthcare Antitrust, Mergers & Acquisitions

Topics covered in this edition: The Federal Trade Commission (FTC) and US Department of Justice have begun implementing the 2023 Merger Guidelines in their enforcement actions During a virtual workshop, the FTC highlighted its focus on private equity (PE) acquisitions of healthcare service providers and expressed concerns about PE in healthcare Artificial intelligence’s antitrust implications...

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Antitrust M&A Snapshot | Q4 2023


By , , , , , and on Feb 14, 2024
Posted In DOJ Developments, EC Developments, EU Developments, FTC Developments, Healthcare Antitrust, Mergers & Acquisitions

Topics covered in this edition: New Merger Guidelines Released FTC Focused on Pharmaceutical Companies FTC Targets “Moat-Building” Mergers Fifth Circuit Fuels FTC’s Vertical Mergers Agenda FTC Losing Streak Reverses During the Fourth Quarter Ex post Review in the Merger Control Sphere Occurring More and More Frequently Access the full issue.

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Antitrust M&A Snapshot | Q2 2023


By , , , , , and on Jul 31, 2023
Posted In DOJ Developments, EC Developments, EU Developments, FTC Developments, Healthcare Antitrust, Mergers & Acquisitions

Topics covered in this edition: FTC Unveils Proposal Detailing Significant Changes to Hart-Scott-Rodino Act Merger Notifications Assa Abloy Settlement Raises Questions on Litigating the Fix and DOJ Consent Decrees Pharmaceutical Industry Remains in Regulators’ Crosshairs “Whole of Government” Competition Mandate Can Impact Deals the FTC and DOJ Do Not Challenge FTC’s Constitutionality Comes Under Fire—Again...

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Cartel Corner | July 2023


By , , , , , , , , and on Jul 13, 2023
Posted In Cartel Enforcement, DOJ Developments, EC Developments, EU Developments, FTC Developments, Monopolization/Abuse of Dominance

In the first half of 2023, antitrust enforcers remained remarkably busy both in the United States (US) and across the European Union (EU). The US Department of Justice’s (DOJ’s) Antitrust Division (Division) and the Federal Trade Commission (FTC) have continued their aggressive and novel effort to drag antitrust enforcement into the labor markets. The DOJ...

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Vertical Agreements & Restriction of Competition by Object: What’s New in Europe?


By , and on Jul 12, 2023
Posted In Brussels Developments, EU Developments, Monopolization/Abuse of Dominance

On June 29, 2023, the Court of Justice of the European Union (CJEU) delivered a preliminary ruling in the Super Bock Bebidas vs. Autoridade da Concorrência case (C-211/22) on the questions referred by the Tribunal da Relaçao de Lisboa (Lisbon Court of Appeal). To some extent, the recent judgement is not particularly noteworthy or innovative,...

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EU Competition Law: New Horizontal Block Exemption Regulations and Horizontal Guidelines


By , , and on Jun 14, 2023
Posted In EC Developments, EU Developments

The European Commission recently adopted and published the revised Research and Development Block Exemption Regulation and Specialisation Block Exemption Regulation, together referred to as the Horizontal Block Exemption Regulations (HBERs), accompanied by the revised Horizontal Guidelines (HGLs). The adoption of the new HBERs and HGLs comes after the conduct of a similar review process and...

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The Potential Benefits of New EU Merger Control Rules


By , and on Jun 9, 2023
Posted In EU Developments, Mergers & Acquisitions

The European Commission recently adopted and published a package to simplify the procedures for reviewing concentrations under the EU Merger Regulation. The goal of the package is to simplify merger review procedures, with a targeted 25% reduction on reporting requirements. In this Law360 article, McDermott Partners Jacques Buhart, Stéphane Dionnet and Frédéric Pradelles examine the...

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EU Commission Adopts New Merger Simplification Package


By , , , and on May 12, 2023
Posted In Brussels Developments, EU Developments, Mergers & Acquisitions

On April 20, 2023, the EU Commission (Commission) adopted and published a package to simplify the procedures for reviewing concentrations under Regulation (EC) 139/2004 of January 20, 2004 (European Union Merger Regulation – EUMR). This package includes a set of three materials comprising (i) a revised Merger Implementing Regulation (Implementing Regulation), (ii) a Notice on...

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CMA Blocks Microsoft’s Acquisition of Activision Blizzard; ‘Game Over’ for Behavioral Remedies?


By and on May 8, 2023
Posted In EC Developments, Mergers & Acquisitions

The Competition and Markets Authority (CMA) blocked what would have been the largest deal in the gaming industry to date on April 26, 2023. This decision brings attention to various significant trends, including: In dynamic markets, regulators are focusing in on whether a deal harms or could harm future competition (i.e., innovation based on predications...

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