Mayer Brown

Mayer Brown is uniquely positioned to advise the world’s leading companies and financial institutions on their most complex deals and disputes. With extensive reach across four continents, we are the only integrated law firm in the world with approximately 200 lawyers in each of the world’s three largest financial centers—New York, London and Hong Kong—the backbone of the global economy. We have deep experience in high-stakes litigation and complex transactions across industry sectors, including our signature strength, the global financial services industry. Our diverse teams of lawyers are recognized by our clients as strategic partners with deep commercial instincts and a commitment to creatively anticipating their needs and delivering excellence in everything we do. Our “one-firm” culture—seamless and integrated across all practices and regions—ensures that our clients receive the best of our knowledge and experience.

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Latest from Mayer Brown

California’s climate disclosure regime continues to evolve rapidly, with significant regulatory developments, implementation guidance, and litigation affecting the compliance landscape for companies doing business in California. There have been several important developments regarding implementation of California’s landmark climate-disclosure statutes—SB 253 (the “Climate Corporate Data Accountability Act”) and SB 261 (the “Climate-Related Financial Risk Act”), together…

On 6 May 2026, the European Commission (“EC”) published its consultation on draft final revised European Sustainability Reporting Standards (“ESRS”), alongside a draft voluntary reporting standard for certain SMEs (“VSME”). The revised ESRS are intended to simplify sustainability reporting under the EU Corporate Sustainability Reporting Directive (“CSRD”) by reducing mandatory datapoints by more than 60%…

There were some significant developments in the corporate sustainability reporting world this week: the EU published the directive implementing the so-called ‘Omnibus 1 package’ (the “Omnibus 1 Directive”), whilst the UK Government published finalised versions of the UK Sustainability Reporting Standards (“UK SRS”).

Omnibus 1 Directive

On 26 February 2026, the Omnibus 1 Directive,…

The second half of 2025 was marked by the Cour de cassation’s recognition of a general duty of vigilance in environmental matters.

More precisely, by two decisions published in its official report (Cass. civ. 1st, 24 September 2025, no. 23-23.869; Cass. civ. 3rd, 13 November 2025, no. 24-10.954), the Cour de cassation endorsed the principle…

In late 2025, the EU postponed the application of the EU Regulation on Deforestation-free products (EUDR) for the the second time. Under Regulation (EU) 2025/2650, the EUDR is now scheduled to enter into application on December 30, 2026. This Legal Update discusses the likelihood of re-opening of the EUDR for further simplification. We also address other…

The Norwegian National Contact Point (“NCP”) issued its Final Statement on 11 December 2025 regarding a complaint filed by SOMO on behalf of 474 Myanmar-based civil society organisations (“CSO”) against Telenor ASA (“Telenor”) concerning Telenor’s operations and exit from Myanmar following the February 2021 military coup. The NCP concluded that Telenor did not conduct ongoing human rights due diligence commensurate with…

Yesterday, 10 December 2025, the Council’s presidency and European Parliament’s negotiators reached a provisional agreement to simplify the EU’s sustainability reporting and due diligence requirements.  The provisional agreement must be now endorsed by the Council and the European Parliament, before it is formally adopted by the two institutions.  However, further changes are unlikely and the…

We know our clients have been following California’s climate-disclosure laws closely – including the timing of effectiveness and the various legal challenges. This update relates to a new Ninth Circuit ruling that has effectively hit “pause” on one key pillar of California’s climate-disclosure package.

On November 18, 2025, the Ninth Circuit Court granted a partial…

This update covers information regarding the California Air Resources Board (CARB) rulemaking delay for California’s climate disclosure laws, SB 253 and SB 261, as well as additional new litigation challenging the constitutionality of these laws. The bottom line for companies is that despite the rulemaking delays and ongoing litigation, the laws remain valid and in…