highperformr logo

South Square's Overview

Total employees65
HeadquartersLondon
Founded

Three Stone is a prominent set of barristers' chambers located at 3-4 South Square, Gray's Inn, London. Formed in 2014 from the merger of two long-established sets, they are recognized for their expertise in commercial and chancery law. Three Stone provides specialist advocacy and advisory services across a wide range of complex disputes and non-contentious matters, both domestically and internationally. Their barristers are known for their intellectual rigour, commercial acumen, client-focused approach, and frequent appearances in high-profile cases.

Where is South Square's Headquarters?

HQ Function

Serves as the primary operational base for all barristers and administrative staff, facilitating client consultations, case preparation, legal research, and chambers management.

Notable Features:

Situated within Gray's Inn, a site of legal importance with centuries of history. The buildings in South Square are typically elegant Georgian townhouses, offering a traditional and distinguished legal environment combined with modern facilities.

Work Culture:

A professional, collegiate, and intellectually stimulating environment that fosters excellence in legal practice. While barristers are self-employed, there's a strong sense of community, supported by an experienced clerking and administrative team dedicated to client service.

HQ Significance:

The location in Gray's Inn signifies a deep connection to the traditions and high standards of the English Bar. Being one of the Inns of Court, Gray's Inn is a historic center for legal education and practice in London.

Values Reflected in HQ: The headquarters reflects values of tradition, legal excellence, integrity, and the esteemed heritage of the Bar, combined with a forward-thinking approach to legal services.

Location:

While primarily based in London and rooted in English law, members of Three Stone possess significant international experience. They frequently advise on and appear in matters in offshore jurisdictions (such as the BVI, Cayman Islands, Bermuda, Channel Islands, and Gibraltar) and participate in international arbitrations. Their practice areas, including commercial litigation, company law, insolvency, and trusts, often have cross-border implications, serving a diverse international clientele.

Street Address:

3-4 South Square, Gray's Inn

City:

London

State/Province:

England

Country:

United Kingdom

South Square's Global Presence

Buying Intent Signals for South Square

Highperformr Signals uncover buying intent and give you clear insights to target the right accounts at the right time — helping your sales, marketing, and GTM teams close more deals, faster.

Notable news
Hiring actively
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
*Example signal, not calculated in real time

Executive Team of South Square

As of April 2025, South Square' leadership includes:

Andrew Onslow KC - Head of Chambers
John McDonnell KC - Deputy Head of Chambers
Justin Brown - Senior Clerk
Ben Caspary - Deputy Senior Clerk

Investors of South Square

South Square has been backed by several prominent investors over the years, including:

Executive New Hires/Exits in the Last 12 Months

Hire0
Exits0

Specific changes at the highest executive level (Heads of Chambers, Senior Clerks) are not frequently publicized unless they represent major shifts. Chambers regularly announce new tenants (barristers joining) or silk appointments (KC appointments), which are distinct from the executive management team. No major executive team hires or exits have been prominently reported for Three Stone in the past 12 months.

Technology (Tech Stack) used by South Square

Discover the tools South Square uses. Highperformr reveals the technologies powering your target accounts — helping your sales, marketing, and GTM teams prioritize smarter and close faster.

South Square Email Formats and Examples

For initial enquiries and communication with Three Stone, the primary contact is through their clerking team via clerks@threestone.law. Individual barristers and staff members typically have direct email addresses following a standard professional format.

[firstinitial][lastname]@threestone.law or [firstname].[lastname]@threestone.law

Format

jbrown@threestone.law (example for Justin Brown based on common format)

Example

70%

Success rate

News and media

threestone.lawApril 25, 2024

Three Stone barristers once again ranked in Chambers & Partners High Net Worth Guide 2024

Three Stone announced that several of its members have been recognised in the Chambers & Partners High Net Worth Guide 2024 for their expertise in traditional chancery and offshore work....more

threestone.lawApril 18, 2024

Three Stone welcomes new tenant Thomas Cattee

Three Stone announced that Thomas Cattee accepted an invitation to join Chambers as a tenant following the successful completion of his pupillage....more

threestone.lawMarch 21, 2024

Three Stone ranked in The Legal 500 Private Client Global Guide 2024

Three Stone announced its ranking in The Legal 500 Private Client Global Guide 2024, with several members recognized for their expertise in private client matters....more

Highperformr’s free tools for company research

Explore Employees by Region or Country

See where a company’s workforce is located, by country or region.

View Funding Details

View past and recent funding rounds with amounts and investors.

Understand Revenue Insights

Understand company revenue estimates and financial scale.

Track Active Job Openings

Track active roles and hiring trends to spot growth signals.

Review Product and Offerings

Discover what a company offers—products, platforms, and solutions.

Get SIC or NAICS Codes

Get the company’s official SIC and NAICS classifications.

Analyze Website Traffic Trends

Analyze visitor volume, engagement, and top traffic sources.

Discover Social Profiles and Engagement

Explore LinkedIn, Twitter, and other active social profiles.

Identify Top Competitors

Identify top competitors based on similar business traits.

Research and Discover Companies with Highperformr — Smarter, Faster

Explore companies in depth — from the tech they use to recent funding, hiring trends, and buyer signals — all in one powerful view.

Highperformr AI helps you surface the right accounts and enrich your CRM with verified company and contact insights, so your teams can prioritize and engage faster.

  • Track intent signals to find buyers who are actively in-market
  • Enrich contacts and companies instantly, no need to switch tools
  • Automate workflows to stay ahead of every change
  • Connect your CRM & tools for seamless data sync and activation

Thousands of companies, including South Square, are just a search away.