Environment Analyst’s annual Market Assessment identifies the leading firms in the Global environmental & sustainability (E&S) consulting market by E&S consulting revenue. For the first time, the ranking combines revenue from Inogen Alliance with participating Antea Group Associate companies, providing a more complete view of the Alliance’s collective scale and market position.
ST. PAUL, Minn., October 5, 2026 /3BL/ - Inogen Alliance today announced that it is ranked No. 19 in Environment Analyst’s latest Global Environmental & Sustainability Consulting Market Assessment, moving up from No. 37 in the previous report. The new ranking is based on environmental and sustainability consulting revenue for financial year 2025, compared with financial year 2024 in the report released at the beginning of 2026.
This is the first Environment Analyst ranking to combine Inogen Alliance revenue with revenue from participating Antea Group Associate companies. The consolidated approach more accurately reflects the full scale of the independent Associate companies that make up Inogen Alliance and the breadth of environmental and sustainability work they deliver for clients around the world. Antea Group is also listed separately at No. 16 in the assessment.
The state-of-the-industry report provides a unique window into market dynamics, competitor rankings, revenue breakdowns, M&A insights and growth opportunities.
“This ranking is meaningful because, for the first time, it more fully reflects the collective strength of Inogen Alliance,” said Angelique Dickson, President of Inogen Alliance. “Our model is different from a single global company: we are independent firms choosing to work together, combining trusted local expertise with the ability to serve clients consistently across countries, cultures and languages. As our membership and client work continue to grow, this recognition gives the market a clearer view of our scale, our capabilities and what global cooperation can achieve.”
The report is based on data from 37 leading Global E&S consulting firms, who account for 63% of the total Global market.
The data featured in the report for the Global Top 37 leading companies is based on figures for the latest fiscal year end. The data is submitted via Environment Analyst’s annual survey and/or estimated based on publicly available annual reports and public information sources where gaps exist. Each firm is given the opportunity to review and verify their data on an ongoing basis, to ensure the information is accurate.
Environment Analyst’s definition of environmental and sustainability (E&S) consulting is: "The provision of specialist technical, management, risk, analytics and strategic advisory services to help organisations understand, manage, and minimise their impacts to protect and enhance the environment and communities, and proactively respond to climate change, the nature crisis and associated impacts".
Environment Analyst members can access the report and data pack here.
About Environment Analyst
Environment Analyst is the trusted intelligence hub for the environmental and sustainability consulting sector, with a global membership community of over 40,000 environmental professionals. Market Intelligence Membership includes access to their entire market intelligence library, featuring bespoke market intelligence reports, data sets, competitor profiles, business news and insights.
For more information about the report contact Editor & Senior Analyst Cameron Franssen at [email protected].
About Inogen Alliance
Inogen Alliance is a global network made up of over 70 of independent local businesses and over 6,000 consultants around the world who can help make your project a success. Our Associates collaborate closely to serve multinational corporations, government agencies, and nonprofit organizations, and we share knowledge and industry experience to provide the highest quality service to our clients. If you want to learn more about how you can work with Inogen Alliance, you can explore our Associates or Contact Us. Watch for more News & Blog updates, listen to our podcast and follow us on LinkedIn.
