Gridlines

What Gridlines does

Gridlines is a UK-headquartered financial advisory firm specializing in financial modelling, project finance, and corporate finance services. The company serves corporate finance teams and project finance professionals — including investors, developers, and advisors — across infrastructure and energy sectors in markets such as the UK, Middle East, India, Mexico, Singapore, and South Africa. Its service portfolio spans project finance advisory, model audits, business modelling, valuations, transaction modelling, tax and accounting advisory, data analytics, and structured financial modelling training courses that have reached over 28,000 professionals.

The firm has developed Openbox, a proprietary financial model building and auditing software launched in May 2020. Openbox is FAST-standard and ICAEW-compliant, supports models up to 500MB, offers parallel build and cell-by-cell audit workflows, integrates with Power BI, and includes an AI feature (in beta) that converts natural language descriptions into financial model structures. Gridlines operates across six global office locations and reports supporting more than $130 billion in global transactions; in Q3 2025 it ranked 2nd globally by deal count in the Inframation League Table for model audits, surpassing the combined output of the Big Four.

Revenue is generated through professional services engagements (advisory, modelling, audits) and training courses, with no publicly disclosed pricing. Distribution is sales-led, relying on direct client enquiries via the website, senior relationship managers (including named directors and partners), and a content-driven top-of-funnel strategy via a blog, LinkedIn presence, and a 35,000+ subscriber newsletter. The company is privately held with no disclosed funding rounds or parent entity, and appears to be founder/management-operated.

Name

Gridlines

Legal name

Gridlines

Website

https://gridlines.com

Company type

Private

Operating status

Operating

Headcount range

11–50 employees

Short description

Gridlines is a UK-based financial advisory firm providing project finance advisory, financial modelling, model audits, and training to infrastructure and energy clients globally, supported by its proprietary Openbox modelling software and a six-office international footprint.

Ownership category

akta.pro rank

Headquarters

HQ city

Manchester

HQ country

United Kingdom

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Financial Modelling Services: Professional services revenue from project finance advisory, business modelling, model audits, and financial modelling courses. Services are delivered by senior experts globally across multiple office locations.
2. Financial Modelling Training: Revenue from training courses including Financial Modelling Foundations, Advanced Project Finance Modelling, Financial Model Review, and Project Finance Modelling Masterclass. Also includes free essential finance modelling training courses.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Gridlines is a financial modelling advisory firm that delivers senior-led project finance advisory, business modelling, model audit, tax and accounting advisory, data analytics, and practitioner-built training courses for infrastructure, energy, and corporate finance clients. The firm supplements these professional services with Openbox, a proprietary software tool for building and auditing financial models in line with the FAST standard and ICAEW code.

Product overview

Gridlines offers a portfolio of financial advisory and modelling services complemented by Openbox, a proprietary software tool. The core services include project finance advisory and modelling, business modelling, model audit, tax and accounting advisory, data analytics, and professional training courses. Openbox is a standalone software platform for building and auditing financial models, featuring AI-powered model generation, FAST standard compliance, scenario analysis, and documentation capabilities. The company has conducted over 100 model audits and supported over $130 billion in global transactions across energy, transport, and social infrastructure sectors.

Differentiator

Problem solved

Functional benefit

Brands

• Openbox: Financial modelling software tool developed by Gridlines for building and auditing financial models, including AI capabilities for automated model generation.

Products and services

• Financial Advisory and Modelling Services Comprehensive financial advisory and modelling services spanning project finance advisory, business modelling, model audit, tax and accounting advisory, and data analytics for corporate, investor, developer, and government clients making high-value infrastructure decisions.
• Project Finance Advisory and Modelling End-to-end advisory and modelling for complex infrastructure and energy project finance transactions, including bid structuring, project finance modelling, operational performance modelling, and infrastructure valuations for investors, developers, lenders, and advisors.
• Model Audit Fast, investor-ready financial model audits for project finance, corporate finance, and government/regulatory models, ranked 2nd globally by deal count in the Q3 2025 Inframation League Table ahead of the Big Four combined.
• Business Modelling Forecasting, valuations, board pack preparation, business and corporate valuations, financial reporting (accounts preparation and covenant reporting), and M&A/transaction modelling for corporate finance teams making smart business decisions.
• Tax and Accounting Advisory Services Tax and accounting advisory services tailored to infrastructure and project finance transactions for corporate, investor, and government clients.
• Data Analytics and Visualisation Data analytics and visualisation services for financial modelling and reporting, leveraging Openbox-generated models that include a flat-file link sheet compatible with Power BI.
• Financial Modelling Training Courses World-class financial modelling training delivered online or in-person, covering the FAST standard and project finance modelling, designed for finance professionals seeking individual certification or team upskilling.
• Openbox Proprietary financial model build and audit software developed by Gridlines for professional financial modellers, featuring FAST standard compliance, scenario analysis, circular reference detection, unit checks, model documentation to PowerPoint/PDF, Power BI integration, and AI-driven natural-language model generation.

Quantifiable outcome

• $130bn+ in global transactions supported
• +3 more outcomes

Named customers10 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability2 records

Feature2 records

Scale indicators5 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• FTI Consulting: Global advisory firm with a Corporate Finance & Restructuring segment that includes infrastructure transaction advisory and valuation services, competing for the same enterprise and infrastructure mandates Gridlines serves.
• Mazars: International audit, tax and advisory firm with a dedicated infrastructure and energy advisory practice that competes for similar mid-market project finance modelling and audit mandates as Gridlines.
• Alvarez & Marsal: Global professional services firm with strong infrastructure, project finance and corporate finance advisory practices that competes with Gridlines on transaction modelling, valuations and financial due diligence.
• PwC Deals & Infrastructure: Big Four deals and infrastructure practice delivering transaction support, valuations and financial modelling for large infrastructure transactions — another incumbent the firm claims to outperform on model audit deal count.
• KPMG Infrastructure Advisory: Big Four infrastructure advisory practice explicitly outperformed by Gridlines on model audit deal count in 2025 per the Inframation League Table; competes on similar project finance, deal advisory and audit engagements globally.
• RSM UK Infrastructure: Mid-tier audit and advisory firm with an infrastructure and renewables practice providing transaction support and financial modelling for project finance deals — comparable scope, though broader and less specialist than Gridlines.

Direct peers

• Corality: Financial modelling training and advisory firm specializing in project finance models for solar, wind and infrastructure assets. Corality is the closest pure-play peer to Gridlines' project finance modelling and training offering and was acquired by Accenture in 2021.
• Turner & Townsend: Global infrastructure advisory and project management firm delivering cost, risk and financial advisory across transport, energy and social infrastructure — directly comparable on infrastructure advisory scope and large-scale project engagements.
• Baringa Partners: Independent management consultancy with a strong energy, resources and infrastructure practice that competes directly for the same senior advisory engagements Gridlines targets in renewables and infrastructure finance.

Emerging players

• Maven Training: UK-based financial modelling training provider offering courses in project finance and corporate modelling — directly comparable to Gridlines' training business and a competitor for the same professional audience.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInuk.linkedin.com/company/gridlines-com

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 Gridlines