What Simpson Thacher & Bartlett does

Simpson Thacher & Bartlett LLP is an international law firm founded in 1884 and headquartered in New York, operating as a limited liability partnership with approximately 2,000 lawyers across 14 global offices spanning North America (New York, Washington D.C., Boston, Houston, Los Angeles, Palo Alto, San Francisco, and a new Dallas office), Europe (London, Brussels, Luxembourg), Asia-Pacific (Tokyo, Hong Kong, Beijing, and a planned Singapore office), and Latin America (São Paulo). The firm provides full-service legal advisory through two principal platforms — Corporate and Litigation — covering M&A, capital markets, private equity fund formation, banking and credit, capital structure solutions, securities litigation, government and internal investigations, real estate, registered funds, and specialized client solutions in artificial intelligence, privacy and cybersecurity, crisis management, leveraged finance, shareholder activism, and national security regulation. The firm serves Fortune 500 corporations, leading private equity sponsors (Blackstone, KKR, Carlyle, Apollo, Francisco Partners, EQT, Apax, Stonepeak), financial institutions, and sovereign entities including Qatar Investment Authority and CalPERS.

Simpson Thacher generates revenue through professional services fees billed to clients on hourly, fixed-fee, or transaction-based terms, negotiated on a per-matter basis. The firm operates a partner-led enterprise field-sales go-to-market motion, pursuing mandates via direct senior lawyer relationships across its global office network and growing through high-profile lateral partner hires from rival elite firms (Kirkland & Ellis, Wachtell Lipton, Latham & Watkins, Akin Gump, Dechert). Recent marquee mandates include the $33.4 billion AES Corporation acquisition by a GIP/EQT-led consortium, the $13.1 billion Blackstone Capital Partners Asia III fundraise, the $10.1 billion Stonepeak-Castrol transaction, the $2.2 billion Jamf take-private for Francisco Partners, the $1.75 billion Blackstone Digital Infrastructure Trust IPO, and advisory on the ByteDance/TikTok USDS Joint Venture. The firm is recognized through top-tier Chambers (Band 1 Securities Litigation 2010-2025; Band 1 Capital Markets Asia-Pacific 2011-2025), Legal 500 (Tier 1 Securities Litigation Defense 2009-2025), GlobalData (#1 Europe M&A legal adviser Q1 2026 at $48.2B), and Law360 (2025 Private Equity Group of the Year) rankings. No proprietary technology platform exists; the firm's product is partner-delivered legal advice, supplemented by thought leadership publications, podcasts, and practice alerts.

Name

Simpson Thacher & Bartlett

Legal name

Simpson Thacher & Bartlett LLP

Website

https://stblaw.com

Company type

Private

Founded year

1884

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Simpson Thacher & Bartlett is an international law firm founded in 1884, with approximately 2,000 lawyers across 14 global offices, serving Fortune 500 corporations, private equity sponsors, and financial institutions in M&A, capital markets, private equity, litigation, and regulatory advisory.

Ownership category

akta.pro rank

Product category

Corporate Legal Services

NAICS

Offices of Lawyers (541110), Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Mergers & Acquisitions (M&A) & Securities Law (BPAHAAAI)

akta.pro secondary industries

White-Collar Defense & Investigations (BPAHAAAJ), Litigation Support & Expert Witness Services (BPAHALAG), Private Credit — Litigation / Legal Finance (FSAHAJAL), Strategic Partnerships, Alliances & JVs Advisory (BPAHADAI)

Keywords

• Corporate legal services
• Mergers and acquisitions
• Capital markets advisory
• Private equity law
• Securities litigation

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices14 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Marketing or Sales, Others

Revenue model

1. Legal Services Fees: Simpson Thacher generates revenue by providing legal advisory services to corporate clients, private equity sponsors, financial institutions, and other entities across practices including M&A, capital markets, private equity, litigation, investment funds, and restructuring. Fees are billed on a hourly, fixed-fee, or transaction basis depending on the matter type.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

Simpson Thacher & Bartlett is a full-service international law firm that provides legal advisory services to corporations, private equity sponsors, financial institutions, and sovereign entities. The firm advises on mergers and acquisitions, capital markets transactions, private equity fund formation, leveraged finance, securities litigation, regulatory investigations, and restructuring matters through partner-led teams across 14 global offices.

Product overview

Simpson Thacher & Bartlett LLP is an international law firm providing comprehensive legal services through a multi-practice platform. The firm operates across Corporate (M&A, Capital Markets, Banking, Private Funds, Capital Structure Solutions) and Litigation practices, supplemented by specialized Client Solutions including Artificial Intelligence, Privacy and Cybersecurity, Crisis Management, and Leveraged Finance. Industry expertise spans Data Centers, Energy, Financial Services, Healthcare, Infrastructure, Insurance, Sports/Media/Entertainment, and Technology. The firm maintains 14 offices globally and employs approximately 2,000 lawyers.

Differentiator

Problem solved

Functional benefit

Products and services

• Mergers and Acquisitions Advisory on domestic and cross-border M&A transactions, take-privates, carve-outs, joint ventures, and strategic acquisitions for corporate clients and private equity sponsors.
• Capital Markets Representation in equity and debt offerings, initial public offerings, high-yield bonds, and other capital markets transactions for issuers and underwriters.
• Banking and Credit Legal counsel on leveraged finance, acquisition finance, structured finance, and credit transactions for financial institutions and corporate borrowers.
• Capital Structure Solutions Integrated practice unifying liability management, special situations, and restructuring teams to advise on capital structure challenges.
• Private Funds Counsel on private fund formation including private equity funds, venture funds, real estate funds, and infrastructure funds for institutional sponsors.
• Registered Funds Counsel on interval funds, tender offer funds, listed closed-end funds, business development companies (BDCs), mutual funds, and ETFs for retail investor access to alternative assets.
• Investment Funds Comprehensive funds practice including private funds, registered funds, fund finance, and asset management regulatory and enforcement matters.
• Securities Litigation Defense of securities fraud class actions, 10b-5 matters, shareholder derivative litigation, and M&A litigation for public companies and their boards.
• Government and Internal Investigations Representation in DOJ, SEC, and other regulatory investigations, including white collar defense, congressional investigations, state attorneys general matters, and compliance advisory.
• Real Estate Real estate M&A, finance, joint ventures, and fund formation for domestic and international real estate transactions.
• Artificial Intelligence Client Solutions Advisory services for clients navigating AI-related legal and regulatory matters, including AI company investigations and technology due diligence.
• Privacy and Cybersecurity Data privacy compliance, cybersecurity incident response, and regulatory guidance on data protection matters.
• Crisis Management and Strategic Response Strategic counsel for companies facing reputational crises, regulatory investigations, and high-stakes legal matters.
• Asset Management Regulatory and Enforcement Regulatory compliance, SEC examinations, enforcement defense, and crypto/digital asset advisory for asset managers and funds.

Quantifiable outcome

• Ranked #1 in Europe M&A legal adviser by deal value ($48.2B) in Q1 2026 per GlobalData
• +5 more outcomes

Named customers8 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators9 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Sullivan & Cromwell: Top-tier firm known for M&A, securities, and banking advisory; competes with Simpson Thacher on flagship capital markets and cross-border M&A mandates.
• Kirkland & Ellis: Largest law firm globally by revenue and the dominant private equity adviser; competes head-to-head with Simpson Thacher on PE fund formation, M&A, and restructuring, and is the most frequent counterparty in lateral moves.
• Latham & Watkins: Elite global full-service firm with comparable scale (~3,000+ lawyers), strong M&A, capital markets, and PE practices; direct competitor on most major Simpson Thacher mandates.
• Wachtell, Lipton, Rosen & Katz: Premier M&A and corporate governance boutique; competes with Simpson Thacher on the largest take-privates and contested transactions, and is a frequent source of lateral M&A partners.
• Paul, Weiss, Rifkind, Wharton & Garrison: Elite New York-headquartered firm with leading PE, M&A, and litigation practices; one of the five US firms recognized as part of London's Magic Circle alongside Simpson Thacher.
• Skadden, Arps, Slate, Meagher & Flom: Large international full-service firm with strong M&A, capital markets, and litigation practices; comparable in scale and competing on many Fortune 500 mandates.
• Cleary Gottlieb Steen & Hamilton: International M&A and capital markets powerhouse with deep European and cross-border capabilities; competes with Simpson Thacher on European and emerging-markets deals.
• Davis Polk & Wardwell: Elite firm with leading securities, M&A, and investment management practices; direct competitor on capital markets and high-end M&A advisory mandates.
• Cravath, Swaine & Moore: Premier New York transactional and litigation firm; competes on the largest M&A mandates and serves many overlapping Fortune 500 clients.
• Debevoise & Plimpton: Elite firm with deep private equity, investment management, and international dispute resolution practices; competes with Simpson Thacher on PE fund formation and cross-border mandates.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Simpson Thacher & Bartlett