Technical, commercial and strategic, our competition team understand clients’ business objectives and we help clients successfully navigate through the most complex of antitrust issues. We recognise that straightforward, practical, focused, timely and business-friendly advice is all that counts. We aim to deliver exactly that on a broad range of local and multi-jurisdictional antitrust matters.
  • Profile
  • Experience
  • Key contacts

Competition law compliance is a high priority for businesses worldwide. Competition authorities are increasingly cracking down on cartels, abusive and other anti-competitive practices as well as strictly enforcing their merger control rules. In the present day, no company or employee can afford to ignore the civil and criminal sanctions that may be applied under the competition rules.  Nor can companies consider themselves immune from the possibility of third party private damages actions.

Based in London and Paris, our competition team have expertise across the full spectrum of competition law and advise an international client base across a range of industry sectors.

In particular, we have extensive experience of:

  • Cartels – including dawn raids, investigations, whistleblowing, leniency and settlement agreements.
  • Abuse of market power – including the negotiation of commitments.
  • Merger control – including national and multi-jurisdictional filings worldwide.
  • Compliance – including advising on compliance programmes as well as conducting audits/mock dawn raids.
  • Commercial agreements – including assisting with the review and drafting of distribution, selective distribution, franchising, agency and other arrangements to ensure compliance.
  • Complaints – including advising on third party interventions.
  • Market investigations – including advising on consumer and industry wide transparency issues and solutions.
  • Private actions and litigation – pursuing or defending against complaints and actions.
  • Public procurement and state aid.

“We felt well-guided by the depth of knowledge the team presented, the pragmatism displayed and the pace by which the transaction was going along. We were impressed by the co-ordination of the various disciplines required within the team.”
The Legal 500 UK 2022

Cartel investigations (including leniency & appeals)

Acting for a defendant in the European Commission's freight forwarding cartel investigation and gaining one of the best leniency deals granted by the European Commission; acting in the subsequent appeal to the EU Courts.

Criminal investigations

Advising in relation to the investigation by the UK's Office of Fair Trading (predecessor to the Competition & Markets Authority) into criminal offences associated with price-fixing in the airline industry.

Dawn raids (including mock-dawn raids and audits)

Providing on-site dawn raid and audit assistance to clients in various industries (including oil, gas, chemicals, construction, leisure and shipping) alleged to be involved in cartel behaviour.

Abuse of market power

Defending a global financial information services provider on a high profile European Commission investigation involving exclusionary abuse of dominance allegations and agreeing commitments.

Unconditional merger control clearances

Securing for a large UK bank Phase I clearances from the European Commission, Brazil, USA, Canada, Mexico and Japan on the sale of its wealth management and exchange traded funds business to a global asset management company.

Conditional merger control clearances

Advising one of the largest global financial information services provider on the sale of its business to a major competitor securing a conditional and simultaneous Phase II clearance from the European Commission and US Department of Justice, as well as clearances in various other jurisdictions worldwide (including Brazil, Canada, Singapore, Turkey and others).

Competition compliance

Preparing, rolling out and delivering competition compliance policies, guidelines and training to organisations in various sectors (e.g. shipping, pharmaceuticals, rail, energy, retail/consumer) across different regions worldwide (e.g. Europe, Asia, Latin America and Africa).

Commercial agreements

Regularly advising clients on various restrictions arising in distribution, selective distribution, franchising, agency, strategic alliances, R&D and specialisation agreements (e.g. exclusivity, resale price maintenance, active/passive sales, territorial restrictions, parallel imports, grant backs, no-challenge & termination clauses).


Advising clients in various sectors (in particular, health, financial information services and consumer) on how to bring complaints and preparing submissions to antitrust authorities against competitors, customers and suppliers engaged in anti-competitive/abusive practices.

Private actions and litigation

Advising a leading Indian real estate developer in one of the first test UK civil cases about alleged manipulation of the LIBOR benchmark.

Marta Isabel Garcia Partner

T:  +44 20 7809 2141 +33 1 4415 8273
M:  +44 7985 716 668 Email Marta Isabel | Vcard Office:  London, Paris


Jean-Julien Lemonnier Partner

T:  +33 1 44 15 80 78
M:  +33 6 61 76 74 57 Email Jean-Julien | Vcard Office:  Paris

Latest news & insights

18 Jan 2022

From Insights

Competition and Markets Authority launches a review of environmental claims in the fashion retail sector

On 10 January 2022, the UK CMA launched its first ever review of environmental claims in the fashion retail sector, amid concerns that the sector is attempting to "gre..


14 Jan 2022

From Insights

CFIUS and the NSIA: Understanding new foreign investment measures in the US and UK

Join Marta Isabel Garcia and Will Spens on Thursday 27 January 2022 for a discussion on the main considerations arising from the NSIA and CFIUS.


20 Dec 2021

From Insights

Competition law update - Q4 2021

Welcome to the Q4 2021 edition of our competition law newsletter. This is our quarterly update covering key developments in UK and EU competition law.


09 Nov 2021

From Insights

Full steam ahead – Gutmann's collective action against train operating companies certified to proceed

On 19 October 2021, the CAT certified the CPO brought by Mr Justin Gutmann against three separate current and former TOCs – namely, First MTR operating the South Weste..


06 Oct 2021

From Insights

Competition law update - Q3 2021

Welcome to the Q3 2021 edition of our competition law newsletter. This is our quarterly update covering key developments in UK and EU competition law.


08 Sep 2021

From Insights

Change on the horizon… CMA consults on proposed reforms to UK competition and consumer policy

The UK Secretary of State for Business, Energy and Industrial Strategy has published a consultation which puts forward the most significant and extensive set of propos..


20 Aug 2021

From Insights

D-day announced – UK's new National Security and Investment Act regime to begin on 4 January 2022

On 20 July 2021, BEIS announced that the new screening regime under the NSIA would officially commence on 4 January 2022. Alongside this announcement, BEIS also publis..


01 Jul 2021

From Insights

Competition law update - Q2 2021

Welcome to the Q2 2021 edition of our competition law newsletter. This is our quarterly update covering key developments in UK and EU competition law.


28 May 2021

From Insights

National Security and Investment Act 2021 – the impact on loans and finance transactions

We are pleased to share with you our briefing on how the NSIA (which received Royal Assent on 29 April 2021 and is likely to come into full effect later this year) may..


30 Mar 2021

From Insights

Competition law update - Q1 2021

Welcome to the Q1 2021 edition of our competition law newsletter. This is our quarterly update covering key developments in UK and EU competition law.


29 Mar 2021

From News

Jean-Julien Lemonnier joins Stephenson Harwood as partner

Law firm Stephenson Harwood LLP has grown its competition capabilities with the arrival of partner Jean-Julien Lemonnier, who joins the firm in Paris.


26 Mar 2021

From News

Stephenson Harwood advises Kroll on Redscan acquisition

Law firm Stephenson Harwood LLP has advised Kroll, a global provider of services and digital products related to governance, risk and transparency, on its acquisition ..


26 Mar 2021

From Insights

The Penrose Report: A roadmap for a future-proof competition regime?

On 16 February 2021, following a mandate from the Government, Robert Penrose MP published a comprehensive report, entitled "Power to the People", which provides an ass..


16 Mar 2021

From Insights

UK Government provides more clarity on the scope of the National Security and Investment Bill (“NSIB”)

We are pleased to share with you our briefing on the UK Government’s response to a public consultation concerning the 17 key sectors subject to the mandatory notificat..


22 Dec 2020

From Insights

Competition law update - Q4 2020

Welcome to the Q4 2020 edition of our competition law newsletter. This is our quarterly update covering key developments in EU and UK competition law.


17 Dec 2020

From Insights

Supreme Court judgment in Merricks opens the door for other collective actions such as Gutmann

This briefing note follows on from our May 2020 briefing when the case was being argued before the Supreme Court. Whilst this note sets out some of the background to b..


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