A&O Shearman earned its place among the Best 100 Law Firms through a combination of scale, global capability, and elite legal service across multiple jurisdictions. Its 2023 merger brought together two legal giants—Allen & Overy and Shearman & Sterling—resulting in a combined force with unmatched strength in international mergers and acquisitions, cross-border litigation, and regulatory advisory.

The firm’s integrated approach ensures that clients receive cohesive, multi-jurisdictional support in even the most complex matters. A&O Shearman’s presence in 29 countries, with over 3,900 lawyers, means that its teams bring both local understanding and international strategy to every engagement. This is critical for clients facing increasingly globalized regulatory environments and deal structures.

What makes the firm truly exceptional is its ability to consistently deliver high-stakes legal solutions across multiple sectors—from financial services to energy and infrastructure—while maintaining a culture of collaboration and client-centric innovation. For these reasons, A&O Shearman is not only one of the largest law firms globally—it is one of the most impactful.

Unlike many large law firms formed through expansion alone, A&O Shearman emerged from the strategic merger of two world-class institutions with complementary strengths and shared values. This distinction has created a unique culture of integration, where clients benefit from both deep legacy expertise and modern legal infrastructure.

The firm is distinguished by its depth in dispute resolution, financial regulatory law, and global transactional practices, with each service backed by a team that operates across continents and languages. A&O Shearman also leads in legal innovation, investing significantly in technology, legal operations, and client-facing platforms that enhance efficiency and transparency.

What sets it apart further is its commitment to diversity, sustainability, and governance. A&O Shearman is not only advising clients on ESG compliance—it is actively shaping its own operations around these values. This alignment of practice and principle marks the firm as a modern global leader, capable of delivering results today while anticipating the needs of tomorrow.

A&O Shearman offers a comprehensive suite of legal services tailored to the needs of multinational corporations operating in a globalized economy. The firm’s legal teams are structured to support complex cross-border transactions, international tax structures, global labor issues, and regulatory compliance.

Its capabilities include advising on international M&A, corporate restructuring, capital markets, and intellectual property portfolio management. A&O Shearman is also a recognized leader in dispute resolution, frequently representing multinationals in international arbitrations, enforcement actions, and cross-border litigation.

With legal experts embedded in 45+ global offices, the firm offers real-time insight into jurisdiction-specific legal trends and evolving global standards. Whether a corporation is entering new markets, navigating global supply chains, or managing multi-jurisdictional compliance programs, A&O Shearman delivers solutions with the scale and agility required at the international level.

Cross-border mergers and acquisitions (M&A) are at the core of A&O Shearman’s global practice. The firm combines technical excellence, commercial understanding, and jurisdictional insight to advise on the world’s most high-stakes deals. Its teams coordinate across geographies to navigate local regulations, tax structures, antitrust concerns, and governance frameworks.

A&O Shearman is regularly ranked among the Top 10 M&A legal advisers globally, reflecting its reputation in both deal volume and value. The firm supports clients from due diligence through post-merger integration, ensuring all legal, regulatory, and operational risks are addressed holistically.

What makes its M&A practice stand out is its ability to mobilize multi-disciplinary teams of corporate, tax, competition, labor, and regulatory lawyers—delivering seamless support across borders. This end-to-end capability, supported by strong industry knowledge in sectors like finance, technology, and energy, is why some of the world’s largest transactions are entrusted to A&O Shearman.

A&O Shearman is widely regarded as a global leader in international arbitration, representing clients in both investor-state and commercial arbitration proceedings. Its lawyers are highly experienced in cases under all major arbitral institutions including ICSID, ICC, LCIA, SIAC, and UNCITRAL.

The firm’s global footprint allows it to handle complex disputes that involve multiple legal systems and cultural nuances. Its arbitration teams regularly act for sovereign states, multinational corporations, and financial entities in disputes relating to construction, energy, finance, and infrastructure.

What truly differentiates A&O Shearman in this field is its strategic litigation planning and procedural excellence, which helps clients secure favorable outcomes in even the most contentious disputes. Its track record includes landmark victories, precedent-setting decisions, and successful enforcement of awards in difficult jurisdictions.

A&O Shearman offers robust support in regulatory and compliance matters, with a dedicated global team that advises clients on evolving legal obligations in banking, securities, privacy, and anti-corruption. The firm’s strength lies in its ability to interpret and apply complex regulatory frameworks across multiple jurisdictions, making it an ideal partner for multinational clients navigating cross-border compliance.

The firm frequently counsels clients on regulatory filings, investigations by global authorities (including the SEC, FCA, and EU regulators), and compliance audits. With increasing regulatory scrutiny on ESG, data protection, and corporate governance, A&O Shearman helps clients proactively design and implement internal controls, reporting mechanisms, and training programs.

Importantly, the firm’s interdisciplinary approach ensures that regulatory strategy is integrated with commercial goals. Its lawyers are not only regulatory experts—they are skilled negotiators and problem-solvers who understand the broader business implications of legal risks. This makes A&O Shearman a preferred legal adviser to financial institutions, listed companies, and tech firms operating under intense regulatory pressure.

Energy and infrastructure law is one of A&O Shearman’s cornerstone practices. The firm supports global clients through every stage of energy development and infrastructure delivery—from financing and project structuring to regulatory approvals and dispute resolution. It has advised on some of the world’s most ambitious infrastructure projects and renewable energy transitions.

A&O Shearman represents a range of stakeholders including governments, developers, investors, and multilateral institutions. The firm has particular expertise in large-scale public-private partnerships (PPPs), energy transition initiatives (solar, wind, hydrogen), and transportation megaprojects. Its ability to address both commercial and sovereign legal issues positions it as a strategic advisor on high-impact projects.

Clients also value A&O Shearman’s deep regulatory knowledge in the energy sector, especially in matters involving environmental compliance, power purchase agreements, and cross-border pipeline negotiations. Whether a client is investing in new infrastructure or restructuring legacy assets, the firm brings unmatched legal and commercial insight to the table.

A&O Shearman serves a wide spectrum of industries, with deep-rooted expertise in financial services, energy, technology, telecommunications, life sciences, infrastructure, and sovereign advisory. The firm’s sector focus allows it to tailor legal strategies that align with the commercial realities and regulatory frameworks unique to each industry.

In the financial sector, the firm advises major banks, fintech startups, and asset managers on compliance, transactions, and disputes. For technology clients, A&O Shearman provides counsel on data privacy, IP, licensing, and M&A. The firm’s energy and infrastructure teams support clients on the legal aspects of project finance, procurement, and regulatory approvals worldwide.

Its industry-driven approach means that clients benefit not only from excellent legal advice but also from attorneys who understand their operational pressures and strategic goals. This is a key reason why A&O Shearman is considered a long-term partner by some of the world’s most sophisticated companies.

A&O Shearman is a global leader in legal innovation, actively leveraging technology to improve client outcomes, efficiency, and risk management. The firm has invested heavily in legal tech platforms that enhance contract automation, document review, AI-driven due diligence, and cross-border collaboration.

It was one of the earliest firms to integrate legal operations teams into deal delivery, allowing clients to benefit from structured workflows, cost predictability, and transparent reporting. Tools like customized client portals and secure collaboration platforms enable real-time project management across jurisdictions.

Innovation at A&O Shearman goes beyond technology—it includes the re-engineering of legal services, new pricing models, and predictive analytics to support strategic decision-making. This mindset ensures the firm stays at the cutting edge of global legal practice and continues to offer value beyond traditional counsel.

Diversity, equity, and inclusion (DEI) are at the core of A&O Shearman’s culture. Post-merger, the firm launched a unified DEI framework aimed at increasing representation, reducing systemic barriers, and fostering a culture of belonging across all offices. This commitment has been recognized by Legal 500 and Chambers Diversity & Inclusion Awards.

Initiatives include global mentoring programs for underrepresented lawyers, inclusive hiring protocols, and measurable targets for leadership diversity. The firm also partners with organizations that promote equity in the legal profession, including the Leadership Council on Legal Diversity (LCLD) and the 30% Club.

By making DEI a strategic priority—not just a policy—A&O Shearman ensures that its talent pool reflects the clients and communities it serves. This inclusive culture enhances creativity, strengthens team performance, and helps drive better legal and business outcomes.

A&O Shearman represents a diverse client base ranging from Fortune 500 companies, sovereign governments, and financial institutions to private equity firms, startups, and nonprofits. Its international platform allows it to serve clients with global operations and complex legal needs across borders.

The firm is frequently engaged by corporate clients for transactional work, regulatory investigations, dispute resolution, and strategic advisory. Government clients seek the firm’s expertise in sovereign debt, trade, and international arbitration. For high-growth companies and investors, A&O Shearman offers agile legal support to scale operations and navigate capital markets.

Clients often cite the firm’s commercial insight, responsiveness, and sector knowledge as key reasons for long-standing relationships. A&O Shearman acts not just as legal counsel, but as a trusted business advisor helping clients seize opportunity while managing legal risk.

With increasing global scrutiny on data privacy and cybersecurity, A&O Shearman offers comprehensive legal counsel to help clients navigate laws such as GDPR, CCPA, and China’s PIPL. The firm provides strategic advice on data governance, cross-border data transfers, breach response, and regulatory compliance.

Its legal teams help clients design privacy policies, conduct risk assessments, and respond to government inquiries and enforcement actions. A&O Shearman also advises on the privacy implications of AI, IoT, and blockchain technologies, ensuring compliance while enabling innovation.

Whether dealing with cyber incident response or privacy-by-design compliance frameworks, the firm combines legal insight with technical fluency. This positions A&O Shearman as a top choice for businesses operating in highly regulated or data-sensitive environments.

A&O Shearman plays an increasingly influential role in environmental and sustainability law, guiding clients through ESG regulatory frameworks, environmental impact assessments, and sustainability reporting requirements. The firm’s expertise is especially relevant for clients operating in energy, infrastructure, and manufacturing sectors.

It advises companies on environmental compliance, emissions regulation, sustainable finance, and corporate ESG strategy. The firm also represents clients in environmental disputes and investigations involving climate risk disclosures and greenwashing claims.

A&O Shearman’s multidisciplinary approach combines environmental law with finance, governance, and litigation capabilities. As sustainability becomes a critical business imperative, the firm helps clients anticipate regulatory shifts and align their operations with global environmental standards.

A&O Shearman supports fintech and digital companies at every stage—from startup formation and licensing to cross-border expansion and compliance. The firm’s digital law team advises on payments regulation, crypto assets, digital banking, and financial data management.

Its attorneys assist with navigating licensing regimes in the EU, UK, U.S., and APAC markets, structuring token offerings, and securing partnerships with financial institutions. The firm also advises on regulatory sandbox participation, anti-money laundering compliance, and tech-specific dispute resolution.

As financial innovation outpaces traditional regulation, A&O Shearman plays a critical role in helping fintech clients interpret gray areas, anticipate enforcement trends, and build legally resilient business models.

Clients seeking legal consultation with A&O Shearman can reach out through the firm’s global contact channels, available via its official website at www.aoshearman.com. The site provides direct access to attorneys by location and practice area, along with inquiry forms for new clients.

For urgent matters, the firm recommends contacting its London headquarters at +44 20 3088 0000 or its New York office at +1 212 848 4000. Inquiries can also be submitted via email at inquiries@aoshearman.com. Each inquiry is routed to a dedicated client services team to ensure a prompt, personalized response.

A&O Shearman welcomes both existing and prospective clients and offers tailored consultation depending on the matter’s jurisdiction, sector, and complexity. Whether it’s a complex cross-border issue or a local regulatory question, the firm provides world-class legal solutions with global precision.