MYCELIUM NETWORK LTD

What MYCELIUM NETWORK LTD does

Mycelium Network Ltd is a Sheffield-based, UK-registered profit-for-good private limited company (Company No. 14137736) that operates an open-access corporate carbon emissions database and API. The platform aggregates 14,275 publicly sourced disclosures from 13,200 companies across 14 industry sectors, applying AI-assisted extraction from sustainability reports, annual reports and regulatory filings, followed by automated sanity checks and normalisation against revenue and industry classification (derived from CDP and MSCI datasets). Each company is benchmarked via the proprietary Mycelium Score and Transparency Score, with full provenance linking back to the original source document and page number. The company's primary mission, embedded in its articles of association, is to accelerate decarbonisation by democratising access to CO2e data.

The product suite is anchored by a free-to-search web platform and a tiered paid API product called Mycelium CORE / CORE Pro, supplemented by the Supplier Match tool (Scope 3 supplier screening) and the recently introduced Mycelium MCP Server, a Model Context Protocol integration that exposes the database directly to AI assistants such as ChatGPT, Claude and Cursor. Underlying data is structured using the Open Corporate Carbon Footprint Data Model, co-developed by Mycelium with the Carbon Accounting Alliance, Murmurate Digital and Roundarc. The company serves procurement teams, investors, sustainability teams, carbon accountants, academics, regulators and software developers, and is a confirmed supplier of emissions data to the UK Government's Department for Energy Security and Net Zero (DESNZ).

Mycelium operates a hybrid freemium + subscription business model. Free web search and an Academic API (non-commercial licence, attribution required) drive top-of-funnel discovery; the Carbon Accountant Coalition offers carbon accounting firms free or heavily discounted API access (up to 100% off) in exchange for contributing verified client disclosures, creating a land-and-expand data flywheel. Commercial API access and Mycelium Core Pro subscriptions (priced by supplier spend and API call volume, with a 14-day no-card trial) constitute the monetised streams. A 1-10 person team supports the platform from its Sheffield headquarters, with distribution driven by SEO, content marketing, white papers and earned government credibility rather than paid advertising.

Name

MYCELIUM NETWORK LTD

Legal name

Mycelium Network Ltd

Website

https://mycelium.global

Company type

Private

Founded year

2022

Operating status

Operating

Headcount range

1–10 employees

Short description

Mycelium Network Ltd operates an open-access corporate carbon emissions database and API covering 14,275 disclosures from 13,200 companies across 14 sectors. It serves procurement teams, investors, sustainability teams, carbon accountants, academics and regulators with structured, machine-readable emissions data.

Ownership category

akta.pro rank

Product category

ESG and Carbon Emissions Data Platform

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518210), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (51821)

SIC

Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Enterprise Carbon Accounting & GHG Inventory Platforms (EUABAEAA)

akta.pro secondary industries

Climate & Emissions Data Management (Data Lake, Integration, APIs) (EUABAEAC), Supply Chain (Scope 3) Emissions & Supplier Engagement Platforms (EUABAEAE), Benchmarking, Ratings & Stakeholder Reporting Portals (Scorecards, Dashboards) (EUABAEAJ), Audit-Ready Controls, Assurance & Compliance Workflow Tools (CSRD/SEC/ISSB) (EUABAEAG)

Keywords

• Carbon emissions data
• ESG data platform
• Carbon accounting API
• Sustainability database
• Emissions benchmarking

Headquarters

HQ city

Sheffield

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

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

Revenue model

1. API Subscription (Commercial): Commercial organisations subscribe to the Mycelium API for programmatic access to company emissions data for integration into products, services, and operational systems. Pricing is based on supplier spend and volume of API calls, making it accessible to smaller operators. The subscription is sold as Mycelium Core Pro on a monthly or annual billing cycle with a 14-day free trial.
2. API Subscription (Carbon Accountant): Carbon accounting firms access the API under a tiered model: free for small portfolios (0-10 companies), reduced pricing for qualifying contributors, and full commercial pricing for those integrating data into client-facing platforms. Data contributors receive discounts or free API access based on portfolio size and number of clients disclosing through Mycelium.
3. API Subscription (Academic): Academic, institutional, and non-profit research organisations receive free or heavily subsidised API access under a non-commercial licence. Requires appropriate attribution. If use extends beyond evaluation, a Commercial Licence may be required.
4. Supplier Match (Pro Feature): Upgrading to Pro enables unlimited CSV downloads of supplier matches with emissions data. Free users are limited to 100 rows during trial. This upsell from free to paid drives conversion for procurement teams.

Pricing tiers

Go-to-market motion3 records

Distribution channels6 records

Marketing channels7 records

Core offering

Mycelium operates an open-access corporate carbon emissions database aggregating 14,275 disclosures from 13,200 companies across 14 industry sectors, freely searchable via the web and programmatically accessible through a paid subscription API (Mycelium CORE / CORE Pro). The platform uses AI-assisted extraction to ingest publicly filed sustainability and annual reports, normalises emissions using revenue and MSCI/CDP-derived industry classifications, and scores every company on a Mycelium Score (out of 10) and a Transparency Score (A–F). A recently introduced MCP Server exposes the dataset as a live source for AI assistants such as ChatGPT, Claude and Cursor.

Product overview

Mycelium operates as a unified platform combining an open-access free-to-search carbon emissions database with a premium subscription API product (Mycelium CORE). The core database aggregates 14,275 disclosures from 13,200 companies, allowing anyone to search, compare, and benchmark company carbon emissions. Mycelium CORE builds on this foundation with professional API access, supplier matching tools, and commercial licensing for teams integrating emissions data into products. A notable addition is the Mycelium MCP Server, a Model Context Protocol integration that connects AI assistants directly to the live database, enabling conversational access to structured emissions data. The product suite is designed for sustainability teams, procurement professionals, carbon accountants, academics, and software developers.

Differentiator

Problem solved

Functional benefit

Brands

• Mycelium CORE: A paid subscription service providing professional-grade API access, supplier matching tools, and commercial licensing for businesses integrating emissions data into their products and workflows.
• Mycelium CORE Pro
• Mycelium MCP Server

Products and services

• Mycelium Open-Access Emissions Database

Quantifiable outcome

• 14,275 open access disclosures from 13,200 companies searchable in one platform
• +3 more outcomes

Named customers5 records

Segments7 records

Ideal customer profiles7 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

AI capability2 records

Feature6 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• University of SheffieldcoreStrategic or Co-development PartnerMycelium was born out of a research project between The University of Sheffield and seven of the world's top carbon accounting software platforms. The collaboration explored standardisation, third-party verification, interoperability, and how a SaaS model can deliver a future carbon accounting system (Carbon Accounting 2.0). This academic partnership is the foundational origin of the company.
• Sheffield Hallam UniversityminorStrategic or Co-development PartnerIn collaboration with Sheffield Hallam University, Mycelium produced a study comparing three leading carbon reporting standards widely used in the UK: The GHG Protocol Corporate Standard, The Task Force on Climate-related Financial Disclosures (TCFD), and the UK Government's SECR guidelines (November 2022).
• Seven carbon accounting software platforms (research collaborators)coreStrategic or Co-development PartnerSeven of the world's top carbon accounting software platforms collaborated with the University of Sheffield on the research project that led to Mycelium's founding. The collaboration explored standardisation, third-party verification, interoperability, and SaaS-based carbon accounting (Carbon Accounting 2.0).
• Department for Energy Security & Net Zero (DESNZ)coreOthersMycelium is a proud supplier of emissions data to the UK Government's Department for Energy Security & Net Zero (DESNZ). Mycelium's data is cited in DESNZ's official report evaluating the Streamlined Energy and Carbon Reporting (SECR) regulations. This government endorsement is a significant credibility marker.
• Carbon Accounting Alliance (Murmurate Digital, Roundarc)coreStrategic or Co-development PartnerMycelium co-developed the Open Corporate Carbon Footprint Data Model with the Carbon Accounting Alliance, Murmurate Digital, and Roundarc. This open data model is the standard used across the Mycelium platform for structuring emissions data, enabling any figure to be tagged as reported or estimated, with full provenance attached.
• Carbon Disclosure Project (CDP)minorOthersMycelium uses benchmark and classification datasets derived from Carbon Disclosure Project and MSCI for industry classification, benchmark weightings, and the normalisation model. This is an inbound data licensing relationship where Mycelium consumes CDP data for its scoring methodology. Mycelium explicitly positions itself as an alternative to CDP.
• MSCIminorOthersMycelium uses MSCI-derived classifications for industry groupings, transparency score weightings, and the normalisation model that estimates unreported emissions categories based on industry classification. This is an inbound data licensing relationship.
• Carbon Accountant CoalitioncoreChannel Partner/ Reseller/ DistributorThe Carbon Accountant Coalition is Mycelium's partner programme for carbon accounting firms. Carbon accountants report verified client emissions into Mycelium's open dataset, earning free or discounted API access (up to 100% off). The more they contribute, the less they pay. Every disclosure published makes the dataset sharper for 10,000+ teams trying to decarbonise. This creates a data contribution flywheel.
• AI Assistant Platforms (Claude Desktop, ChatGPT, Cursor)coreTechnology or IntegrationMycelium is building an MCP server (Model Context Protocol) that connects its emissions database to AI assistants including Claude Desktop (Anthropic), ChatGPT (OpenAI), and Cursor. This integration allows LLMs to query live emissions data directly in conversation with full provenance, using the Open Corporate Carbon Footprint Data Model. Early access sign-up is available.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Carbon Disclosure Project (CDP): Long-established global disclosure system for companies, cities, and investors. Mycelium explicitly positions itself as the open-access alternative to CDP, and consumes CDP/MSCI data for normalization. The most direct incumbent competitor.
• Sphera (Corporate Sustainability): Enterprise ESG, carbon, and product stewardship software. Targets the same large enterprise sustainability and procurement buyers; offers a much broader portfolio beyond database/API access.
• Salesforce Net Zero Cloud: Carbon accounting offering within the Salesforce CRM platform for large enterprises. Overlaps with Mycelium's enterprise carbon accounting functionality but bundles it into a much broader enterprise software stack.
• Microsoft Sustainability Manager: Microsoft's enterprise carbon and ESG reporting platform integrated with Azure. Competes for the same enterprise ESG reporting budget; offers deep Microsoft Cloud integration that Mycelium cannot match.
• IBM Envizi: IBM's ESG reporting and carbon accounting suite, strong in large enterprise and regulated industries. Comparable buyer persona and Scope 1/2/3 reporting overlap; competes as a much larger, broader platform.

Direct peers

• Sweep: Carbon management platform for enterprises with strong Scope 3 / supplier engagement capabilities. Comparable because it directly addresses supplier emissions matching and Scope 3 reporting — overlapping with Mycelium's Supplier Match feature.
• Persefoni: Climate management and accounting platform for enterprises and financial institutions. Comparable as a competitor targeting the same enterprise carbon accounting workflow; offers a more vertically integrated SaaS approach vs. Mycelium's open-data positioning.
• Watershed: Enterprise carbon accounting platform offering measurement, reporting, and reduction tools. Directly competes with Mycelium for corporate sustainability and procurement buyers; differentiated by being a full SaaS carbon accounting suite vs. Mycelium's database/API play.
• Plan A Earth: Carbon accounting and decarbonization SaaS platform for enterprises. Directly competes for SMB and mid-market sustainability teams; like Mycelium, it positions as a more accessible alternative to legacy ESG platforms.

Emerging players

• Climatiq: API-first carbon emissions intelligence platform offering programmatic access to emissions factor data. Closest API-first comparable to Mycelium's developer/business model; focused on emissions factors rather than corporate disclosures.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/mycelium-carbon-network

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 MYCELIUM NETWORK LTD