European Commission Merger Guidelines: Sullivan & Cromwell

The European Commission has published the most comprehensive overhaul of EU merger control guidance in over two decades, introducing a new “theory of benefit” framework that gives merging parties a broader set of arguments for defending transactions while making clear that the burden of proof sits firmly with those seeking to use them.

The draft revised Merger Guidelines, published on 30 April 2026 and open for public consultation until 26 June 2026, consolidate the Commission’s 2004 Horizontal and 2008 Non-Horizontal Merger Guidelines into a single framework for the first time, reflecting two decades of case law, decisional practice and a pronounced shift in EU economic policy priorities.

The centrepiece of the new framework is the “theory of benefit” — a structured mechanism allowing merging parties to demonstrate that a merger’s efficiencies outweigh its anticompetitive effects. For the first time in official Commission guidance, those efficiencies can include non-economic policy objectives: sustainability, net-zero commitments, supply chain resilience and the global competitiveness of European industry.

The Guidelines explicitly address the political fallout from the Commission’s 2019 block of Siemens/Alstom, a decision that drew fierce criticism for preventing the creation of a European rail champion despite strong public interest arguments. The new framework, shaped in part by the EU Competitiveness Compass, creates a pathway for scale-building mergers of that kind, provided parties can substantiate a credible case from the outset.

Sullivan & Cromwell, Latham & Watkins, Skadden Arps, White & Case, Norton Rose Fulbright, Bird & Bird and Pinsent Masons have each published analysis of the draft framework, collectively identifying three recurring themes: the new “theory of benefit” creates wider room for efficiency arguments than the Commission has previously accepted; the innovation shield introduces meaningful protection for acquisitions of early-stage targets in non-overlapping R&D spaces, subject to defined thresholds; and the de-emphasis of static market share metrics in favour of dynamic competitive indicators will require parties to develop richer evidence packages than current practice typically demands.

The Commission has signalled it intends the new concepts to be applied in live cases before finalisation, meaning the period before the 26 June consultation close is the practical window for practitioners and their clients to influence the final text.

EU Competition Commissioner Teresa Ribera drew a clear line in April 2026: the Guidelines are no blank cheque. The EU Merger Regulation and its underlying legislation remain unchanged, and the Commission retains full discretion to probe theories of harm, demand quantification of alleged benefits and reject arguments grounded in wishful thinking rather than evidence. DMA-designated gatekeepers and acquirers holding the largest position in a relevant market are also explicitly excluded from the innovation shield, narrowing its application for the most significant players.

M&A solicitors, competition barristers and in-house counsel at deal-active organisations face an immediate practical shift. The new framework rewards early preparation. Merging parties that build a theory of benefit grounded in internal documents, independent expert analysis and clear evidential links between the transaction and claimed policy gains before opening Commission engagement will be better positioned than those raising efficiency arguments as a reactive response to concerns.

The Commission has signalled it wants to see the new concepts tested in practice before the Guidelines are finalised in Q4 2026. Practitioners who move now to advise clients on the evidential requirements of the new framework will hold a material advantage over those who wait for the final text.