Leyton France

What Leyton France does

Leyton France is the French operating arm of the THESEE SAS-led international consulting group, headquartered in Saint-Cloud (with a related Thésée headquarters presence in Issy-les-Moulineaux) and serving businesses with R&D tax credit, innovation funding, government grant, energy efficiency, and broader state and local tax advisory needs. The group operates through wholly-owned subsidiaries in 15+ countries spanning Europe, North America, and Africa (including USA, Canada, Morocco, UK, Germany, Italy, Spain, the Nordics, and others), and is run by CEO and founder François Gouilliard with COO Olivier Rousselle, Managing Director Nicolas Jacquier, and Head of Strategic Development Vivek Arora.

The firm staffs engagements with hybrid teams that combine technical specialists (engineers, PhDs, scientists) with tax and financial experts, and delivers services across verticals such as software and technology, manufacturing, life sciences, construction, hospitality, energy technology, and clean technology. Underlying delivery tooling is limited to standard calculators, digital documentation, and tracking systems, plus a productized application called 'Leyton for me' for digitizing R&D and tax credit filings; no proprietary AI or platform architecture is disclosed in the available sources.

Leyton operates a pure fee-for-service model with a success-based pricing structure (no upfront payment, no hourly billing, no fee if no eligible R&D activities are identified) and multi-year engagements. Go-to-market is sales-led, primarily direct to enterprise and mid-market clients, augmented by a structured CPA and tax-professional referral channel and partner programs (NASBA, GBI, Eureka Innolink, CanExport). Scaled outcomes include over 50,000 businesses served globally, $500M in cumulative client tax relief, 6,000 Canadian businesses assisted, and 500 SR&ED claims accepted per year in Canada, with a 96% client satisfaction rate cited for the Canadian practice; a single 2006 Omnes Capital capital event appears in the disclosed funding history with no further rounds recorded.

Name

Leyton France

Legal name

THESEE SAS

Website

https://leyton.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Leyton France is the French arm of THESEE SAS, an international consulting firm that helps SMBs and mid-market companies across 15+ countries claim R&D tax credits, government grants, and energy efficiency incentives on a success-based fee model.

Ownership category

akta.pro rank

Product category

Tax & Innovation Incentive Consulting

NAICS

Management Consulting Services (54161), Professional, Scientific, and Technical Services (54), Management, Scientific, and Technical Consulting Services (5416), Administrative Management and General Management Consulting Services (541611)

SIC

Services-Management Consulting Services (8742), Services-Management Services (8741)

akta.pro primary industry

Cost Reduction & Working Capital Optimization (BPAHAHAL)

Keywords

• R&D tax credits
• Tax incentive consulting
• Innovation funding
• Government grants advisory
• Cost optimization consulting

Headquarters

HQ city

Saint-cloud

HQ country

France

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services - Tax Consulting: Fee-based consulting services for R&D tax credits, government grants, tax recovery, and financial incentives optimization. Success-based fee model with no upfront payment required.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels8 records

Core offering

Leyton France is a consulting firm that helps businesses identify, claim, and optimize innovation-related financial incentives including R&D tax credits, government grants, energy efficiency incentives, state and local tax programs, and cost recovery services. The firm combines technical specialists (engineers, PhDs, scientists) with tax and financial experts to deliver end-to-end engagements covering eligibility assessment, documentation preparation, claim filing, and audit defense. Services are delivered under a success-based fee model with no upfront payment required.

Differentiator

Problem solved

Functional benefit

Brands

• Leyton for me: An innovative application to digitize, streamline and simplify R&D and tax credit applications.

Products and services

• R&D Tax Credit Consulting service helping businesses identify eligible R&D activities, prepare technical and financial documentation, and claim R&D tax credits at federal and state levels.
• Energy Efficiency Incentives Advisory and claim filing for energy efficiency incentives including the §45L Energy Efficient Home Tax Credit, §179D Energy Efficient Commercial Building Property Deductions, and energy modeling services.
• Employee Retention Credit Representation Representation and audit support service for businesses claiming the Employee Retention Credit (ERC), including IRS claim reviews.
• Payroll R&D Tax Credit Service enabling startups and small businesses to claim up to $500,000 per year in payroll-based R&D tax credits against employer payroll taxes.
• Cost Segregation Cost segregation study service that identifies assets within a property to accelerate depreciation deductions and maximize tax savings and cash flow for property owners.
• Corporate Finance Advisory (M&A) M&A advisory service supporting businesses on corporate finance transactions, including deal structuring and execution support.
• Orphan Drug Tax Credit Specialized consulting service for pharmaceutical and biotech companies seeking to maximize benefits from the Orphan Drug Tax Credit (ODTC).
• Grants and Incentives Service identifying and securing government grants and non-dilutive funding programs for businesses pursuing innovation, hiring, training, or international expansion.
• State and Local Tax (SALT) State and local tax consulting including nexus studies, voluntary disclosure agreements, sales and use tax refund reviews, exemption certificate management, and utility sales tax exemption services.
• Property Tax Property tax consulting service providing businesses with property tax strategy, assessment review, and reduction advisory.
• VAT Services VAT advisory service covering registration, compliance, and filing requirements for businesses operating internationally.
• Duty and Tariff Recovery Service to recover overpaid customs duties including custom duty drawback claims and IEEPA customs tariff refunds.

Quantifiable outcome

• $500M in tax relief delivered to clients
• +3 more outcomes

Named customers8 records

Segments10 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Five partnerships are on record, tiered core and minor.

• CPA & Tax ProfessionalscoreChannel Partner/ Reseller/ DistributorPartnership program for Certified Public Accountants and tax professionals to maximize client relationships by providing access to Leyton's R&D tax credit and incentive expertise.
• NASBA (National Association of State Boards of Accountancy)minorOthersLeyton is NASBA certified to offer CPE (Continuing Professional Education) credits, enabling accounting professionals to earn credits through Leyton's educational content.
• GBI (Green Building Initiative)minorStrategic or Co-development PartnerLeyton and GBI partnership focuses on eco-friendly and cost-effective building solutions, combining energy efficiency incentives with green building certification expertise.
• Eureka Innolink Program PartnersminorStrategic or Co-development PartnerInternational R&D partnership program empowering companies to pursue international R&D adventures with access to Eureka network support and funding opportunities.
• CanExport PartnersminorGTM or Marketing PartnerGovernment grant partnership helping Canadian businesses finance innovation projects, hiring, training, and expansion into new markets through CanExport programs.

Scale indicators8 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Source Advisors: Source Advisors is a US R&D tax credit specialist serving SMB and mid-market clients with a delivery model very similar to Leyton's. It is among the most direct functional competitors for innovation tax credit services in North America.
• CBIZ: CBIZ provides tax credit and incentives services including R&D tax credits, cost segregation, and energy incentives for US-based mid-market clients. Its service portfolio and target market make it a strong functional comparator to Leyton's US business.
• Cherry Bekaert: Cherry Bekaert's Federal Credits & Incentives practice focuses on R&D, energy, and state credits for mid-market clients. Its service mix and client profile overlap significantly with Leyton's innovation funding offering.
• Alliant Group: Alliant Group is a US-based tax credit and incentives consultancy specializing in R&D tax credits, cost segregation, and energy efficiency incentives. It is one of the closest pure-play competitors to Leyton's innovation funding practice, serving the same SMB-to-mid-market segment with a similar success-based engagement style.
• Katz, Sapper & Miller (KSM): KSM runs a dedicated R&D Tax Credit practice serving mid-market and emerging companies. Its specialty advisory positioning, sector specialization, and pricing model closely parallel Leyton's go-to-market approach.

Broad incumbents

• KPMG France: KPMG's French practice includes a CIR (Crédit d'Impôt Recherche) advisory offering that competes directly with Leyton France on the same client base. As a Big 4 firm, KPMG offers broader tax and advisory capabilities but lacks Leyton's deep specialization and success-based pricing.
• EY France: EY's French and global tax services include R&D credit advisory that competes directly with Leyton France. As a Big 4 incumbent, EY offers scale, brand, and cross-border tax advisory that boutique Leyton must offset via specialization and pricing.
• BDO USA: BDO operates a global professional services network with a dedicated R&D Tax Credits practice that mirrors Leyton's core offering across multiple industries and geographies. As a broader accounting/advisory incumbent, BDO competes for the same clients as a "one-stop-shop" alternative to Leyton.
• Mazars: Mazars is a France-rooted international mid-tier accounting and advisory firm with a tax incentives practice. As a peer headquartered in the same region with similar cross-border ambitions, Mazars competes for many of Leyton's European clients.
• RSM US: RSM US runs a substantial R&D and Credits & Incentives practice that competes head-to-head with Leyton for mid-market innovation clients. Its scale, audit heritage, and industry specialization make it a key substitute for Leyton's enterprise clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@leytonusa
• Facebookfacebook.com/WeareLeyton1
• LinkedInlinkedin.com/company/leyton
• Xx.com/LeytonFrance

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries14 records

Funding overview

Funding rounds1 record

Investors1 record

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 Leyton France