What Simpson Thacher & Bartlett LLP does

Simpson Thacher & Bartlett LLP is a private international law firm founded in 1884 and headquartered in New York. It operates approximately 15 offices across the United States, Europe, Asia, and Latin America, with roughly 2,000 lawyers organized across more than 30 practice areas and serving clients in over 20 industries. Its core client base consists of large corporations, financial institutions, and private equity sponsors, which it serves on complex cross-border transactions and high-stakes disputes.

The firm delivers professional legal services across core practices including Corporate, Litigation, Mergers and Acquisitions, Capital Markets, Banking and Credit, Leveraged Finance, Private Funds, and Real Estate, as well as specialized client solutions in areas such as Artificial Intelligence, Privacy and Cybersecurity, National Security Regulatory Practice, Crisis Management, and Shareholder Activism. Recent matter-level activity includes advising Berkshire Hathaway on its acquisition of Taylor Morrison (approximately $8.5 billion enterprise value), Mizuho Financial Group on a US$6.6 billion senior notes offering, Blackstone on the formation of Blackstone Capital Partners Asia III ($13.1 billion) and the IPO of Blackstone Digital Infrastructure Trust ($1.75 billion), and Sony Music Publishing on its acquisition of the Recognition Music Group catalog from Blackstone-managed funds. The firm also represented M&T Bank Corporation in securing summary judgment in litigation arising from its $3.7 billion merger with Hudson City Bancorp.

Simpson Thacher generates revenue through professional legal services fees — including hourly billing, fixed fees, and success fees — negotiated individually with clients based on matter complexity and scope. As a limited liability partnership, the firm is privately held by its equity partners and does not publicly disclose revenue. It acquires clients primarily through reputation, peer referrals, and demonstrated expertise on landmark matters, supported by thought-leadership publications, podcasts, and a searchable online lawyer directory. In 2026 the firm opened a Dallas office and launched a Hybrid Capital Practice with three lateral partners, signaling continued geographic and capability expansion.

Name

Simpson Thacher & Bartlett LLP

Legal name

Simpson Thacher & Bartlett LLP

Website

https://simpsonthacher.com

Company type

Private

Founded year

1884

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Simpson Thacher & Bartlett LLP is a New York-headquartered international law firm founded in 1884, with approximately 2,000 lawyers across 15 global offices serving corporations, financial institutions, and private equity sponsors on complex M&A, capital markets, leveraged finance, and litigation matters.

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 industry

M&A Advisory (Buy-Side & Sell-Side) (BPAHAOAA)

Keywords

• Corporate legal services
• Mergers and acquisitions
• Capital markets law
• Private equity funds
• Litigation services

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices15 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Marketing or Sales, Technology or R&D, Others

Revenue model

1. Legal Services Fees: The firm generates revenue through professional legal services fees charged to corporate clients for corporate transactions, litigation, regulatory advisory, and other legal matters. Fee structures typically include hourly billing, fixed fees for specific matters, and success fees for certain transactions.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Simpson Thacher & Bartlett LLP is a global law firm providing legal counsel to major corporations, financial institutions, and private equity sponsors on complex matters. Core offerings span corporate transactional work (M&A, capital markets, leveraged finance, private equity fund formation, real estate), litigation and dispute resolution, and specialized advisory solutions including artificial intelligence, privacy and cybersecurity, national security/regulatory, and shareholder activism. Services are delivered on an engagement basis to enterprise clients across 15 offices worldwide.

Product overview

Simpson Thacher & Bartlett LLP is a law firm offering legal services across multiple practice areas rather than a technology product company. The firm provides core practices including Corporate, Litigation, Banking and Credit, Capital Markets, Mergers and Acquisitions, Real Estate, and Private Funds. The firm also offers specialized Client Solutions including Artificial Intelligence advisory, Privacy and Cybersecurity, Leveraged Finance, National Security Regulatory Practice, and others. The firm operates with approximately 2,000 lawyers across 15 offices worldwide, organized into 30+ practice areas serving 20+ industries.

Differentiator

Problem solved

Functional benefit

Products and services

• Corporate Practice Core corporate legal services for corporations and financial institutions covering advisory work, governance, and strategic transactions.
• Litigation Practice Complex litigation and dispute resolution services across multiple jurisdictions for corporate and financial institution clients.
• Banking and Credit Banking and credit legal services for financial institutions and corporate borrowers.
• Capital Markets Equity and debt capital markets transaction services including IPOs, secondary offerings, and other securities issuances.
• Capital Structure Solutions Advisory on capital structure optimization and liability management for corporate clients.
• Mergers and Acquisitions M&A advisory and execution services for domestic and cross-border transactions.
• Real Estate Real estate transactions, financing, and development advisory services for institutional clients.
• Private Funds Formation and ongoing operation of private equity, venture capital, and hedge funds for institutional sponsors.
• Artificial Intelligence Client Solution Legal advisory services on artificial intelligence technologies and related regulatory compliance matters.
• Privacy and Cybersecurity Legal services addressing data privacy regulations and cybersecurity risk management.
• Leveraged Finance Leveraged finance transaction advisory and documentation services for sponsors and corporate borrowers.
• National Security Regulatory Practice CFIUS and national security regulatory advisory for cross-border transactions and investments.

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Debevoise & Plimpton LLP: Debevoise is a top-tier New York firm with leading private equity, M&A, and financial institutions practices. It directly competes with Simpson Thacher for sponsor clients and large strategic transactions.
• Kirkland & Ellis LLP: Kirkland is the dominant law firm for private equity sponsors, with leading practices in M&A, fund formation, and leveraged finance. It is a direct competitor for PE sponsor clients and large-cap transactions where Simpson Thacher is also engaged.
• Davis Polk & Wardwell LLP: Davis Polk is a top-tier New York law firm with leading M&A, capital markets, and financial institutions practices. It competes directly with Simpson Thacher for the largest equity and debt offerings and strategic transactions.
• Skadden, Arps, Slate, Meagher & Flom LLP: Skadden is a leading global law firm with strong M&A, capital markets, and private equity practices that directly overlap with Simpson Thacher's core corporate offering. It serves many of the same large-cap and sponsor clients.
• Wachtell, Lipton, Rosen & Katz: Wachtell is the leading M&A and corporate governance law firm and a direct competitor on premium takeover defense, shareholder activism, and large-cap transactions. Both firms anchor the top tier of U.S. transactional practices serving Fortune 500 and PE clients.
• Paul, Weiss, Rifkind, Wharton & Garrison LLP: Paul Weiss is a leading global law firm with strong M&A, private equity, and capital markets practices. It serves an overlapping sponsor and large-cap client base and competes for the same marquee mandates.
• Cleary Gottlieb Steen & Hamilton LLP: Cleary is a globally integrated law firm with parallel strength in M&A, capital markets, antitrust, and international corporate transactions. It frequently co-bids with Simpson Thacher on cross-border mandates and serves a similar institutional client roster.
• Cravath, Swaine & Moore LLP: Cravath is a premier New York corporate and litigation firm with strong M&A and capital markets practices. It competes with Simpson Thacher for the largest strategic transactions and IPO mandates.
• Sullivan & Cromwell LLP: Sullivan & Cromwell is a premier global law firm with overlapping strength in M&A, capital markets, private equity, and complex cross-border transactions. It competes directly with Simpson Thacher on the largest deals and serves the same institutional and sponsor client base.
• Latham & Watkins LLP: Latham is one of the largest global law firms, with market-leading M&A, capital markets, leveraged finance, and private equity practices. It is a direct competitor for sponsor-led and large-cap transactions and has comparable global office coverage.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/simpson-thacher-bartlett-llp

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 LLP