Fietta LLP

What Fietta LLP does

Fietta LLP is a London-based specialist public international law (PIL) boutique founded in 2015 by Stephen Fietta KC, one of the world's leading PIL practitioners with 25+ years of experience. The firm represents sovereign States, Fortune 500 corporations, private equity firms, and high-net-worth individuals in the most complex international disputes, operating across five practice areas: State-to-State Disputes (including ICJ, ITLOS, PCA, ECHR and CJEU proceedings), International Investment Disputes (ICSID, UNCITRAL, SCC, LCIA, ICC arbitrations), Public International Law Advisory, Post-Award Procedures and Enforcement, and International Environmental Law, Human Rights and Pro Bono. The team of approximately 17-23 professionals includes partners, special counsel, senior associates, associates, trainee solicitors, paralegals, and a finance manager, with dual qualifications across English, US, French, Australian, Ukrainian, Pakistani, and EU bars.

The firm generates revenue through bespoke professional fees on quote-based engagements, with flexible charging structures tailored to each matter and multi-year contract cadences typical of complex arbitration work. Its go-to-market is reputation-driven: the firm does not engage in traditional sales or marketing, instead relying on top-tier rankings in Chambers Global, Chambers UK, Legal 500, GAR 100, Lawdragon 500, and Who's Who Legal, alongside academic contributions (Oxford DPhil scholarship, Edinburgh PhD sponsorship, NILOS moot sponsorship), thought-leadership content (LinkedIn 'PIL Latest' alerts), and direct partner-level relationship management to source matters.

Fietta LLP has been engaged in over 60 investment treaty disputes, secured more than US$1.2 billion in damages for investor clients across four awards above US$100 million, and maintained a 100% positive outcome rate for concluded State-to-State disputes, including representation in 10 ICJ cases. The firm is authorised and regulated by the Solicitors Regulation Authority (SRA number 637378) and operates as a private limited liability partnership with no disclosed external institutional ownership.

Name

Fietta LLP

Legal name

Fietta LLP

Website

https://fiettalaw.com

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Fietta LLP is a London-based specialist public international law boutique founded in 2015, representing sovereign States, Fortune 500 corporations, and high-net-worth individuals in complex international disputes before the ICJ, ICSID, PCA, and other major tribunals.

Ownership category

akta.pro rank

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Legal Services - Professional Fees: Fietta LLP generates revenue through professional legal fees for representing clients in international disputes, advisory services, and arbitration proceedings. The firm offers flexible charging structures to meet individual client needs and incentivize success.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Fietta LLP is a specialist public international law firm founded in 2015 by Stephen Fietta KC in London. The firm represents sovereign States, State-owned entities, and private investors in State-to-State disputes, investor-State dispute settlement (ISDS), public international law advisory, post-award procedures and enforcement, and international environmental law, human rights, and pro bono matters.

Product overview

Fietta LLP operates as a single-service law firm dedicated exclusively to public international law. The firm offers a unified suite of legal services organized into five interconnected practice areas: State-to-State Disputes (representing clients in international courts and tribunals), International Investment Disputes (investor-State arbitration), Public International Law Advisory (cross-cutting PIL advice), Post-Award Procedures & Enforcement (award enforcement and set-aside proceedings), and International Environmental Law, Human Rights & Pro Bono. These services are highly specialized and often overlap in complex disputes, with the firm acting as both lead and coordinating counsel across jurisdictions.

Differentiator

Problem solved

Functional benefit

Products and services

• State-to-State Dispute Resolution
• Investor-State Dispute Settlement (ISDS)
• Public International Law Advisory
• Post-Award Procedures and Enforcement
• International Environmental Law, Human Rights and Pro Bono

Quantifiable outcome

• Over US$1.2 billion in damages secured for investor clients across four awards above US$100 million each
• +3 more outcomes

Named customers9 records

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Three partnerships are on record, tiered minor.

• Netherlands Institute for the Law of the Sea (NILOS) - Utrecht UniversityminorStrategic or Co-development Partner · 1 June 2026Fietta LLP is sponsoring the NILOS Moot Court Competition 2027. NILOS is one of the few law firms globally dedicated to the practice of the Law of the Sea, supporting the next generation of practitioners, scholars, and advocates in this highly specialised field.
• University of Edinburgh - School of GeoSciencesminorStrategic or Co-development Partner · 1 January 2025Fietta LLP sponsors a PhD studentship research project at the University of Edinburgh, enabling PhD student Ms. Christine Gaebel to research marine biodiversity beyond national jurisdiction with focus on 'Evidence-Based Management of Marine Biodiversity Beyond National Jurisdiction in a Changing Ocean'.
• Oxford University Law FacultyminorStrategic or Co-development Partner · 1 January 2017Fietta LLP and Oxford University Law Faculty have an established DPhil scholarship in memory of James Upcher. The James Upcher Memorial Scholarship facilitates post-graduate study at Oxford for those passionate about public international law and its practical application.

Scale indicators4 records

Recent moves2 records

Expansion highlights5 records

Broad incumbents

• White & Case: Global law firm with one of the world's largest international arbitration practices. Major incumbent competitor in ISDS and PIL matters, with global reach and bench depth significantly exceeding Fietta's.
• Freshfields Bruckhaus Deringer: Magic Circle firm with a leading international arbitration and public international law practice. Competes with Fietta for major ISDS mandates, particularly investor-State matters, with much greater resource scale.
• Arnold & Porter: Global law firm with a top-ranked public international law and investor-State arbitration practice. Larger incumbent with comparable PIL expertise but materially broader practice portfolio and headcount.

Direct peers

• Essex Court Chambers: Leading London barristers' chambers with a top-ranked public international law and international arbitration practice. Directly comparable to Fietta as a London-based specialist disputes set acting in ICJ, ISDS, and State-to-State matters.
• Brick Court Chambers: London commercial/public law chambers with an international arbitration and public international law offering. Comparable specialist chambers competing for institutional arbitration and PIL advisory work.
• Lalive: Geneva-based specialist law firm concentrating in international arbitration and public international law. Closest international boutique peer to Fietta in scale and PIL/ISDS focus, often instructed alongside or in competition with Fietta in major treaty arbitrations.
• Matrix Chambers: London chambers with a strong public international law and human rights practice. Competes with Fietta for high-profile PIL advisory and contentious mandates, particularly before international courts and tribunals.
• Curtis, Mallet-Prevost, Colt & Mosle: International law firm with a long-standing public international law and investor-State arbitration practice. Direct peer in ISDS work, regularly appearing in ICSID and UNCITRAL matters alongside Fietta.
• Twenty Essex: London barristers' chambers with a recognised public international law and international arbitration group. Direct peer in the London specialist PIL bench, regularly instructed in ICJ and ISDS proceedings.
• Volterra Fietta: The world's first specialist public international law firm, co-founded by Stephen Fietta in 2011. Direct predecessor and historic peer — the firm from which Fietta LLP was spun out — and a continuing rival for specialist PIL mandates.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/fietta

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Fietta LLP