'Our homegrown tech sector continues to prove itself on the global stage': Five Northern Ireland tech firms among Europe’s fastest-growing companies
StormHarvester leads Northern Ireland businesses at 24th in Deloitte’s EMEA Technology Fast 500, with five local firms featuring in the prestigious ranking.
Five technology companies from Northern Ireland have been named among the fastest-growing businesses across Europe, the Middle East and Africa in Deloitte’s 2025 EMEA Technology Fast 500.
Belfast-based StormHarvester was the highest-ranked Northern Ireland company, placing 24th overall after recording revenue growth of more than 3,012% over four years.
The company, which has developed an advanced anomaly detection system to help wastewater utilities predict and prevent flooding and pollution, was also the 2025 winner of Deloitte Ireland’s Technology Fast 50.
Four other Northern Ireland businesses also featured in the 500-strong ranking. Broadband provider Fibrus placed 143rd, security software firm Halo Technologies was 264th, sports software company TeamFeePay ranked 299th, while climate technology business CATAGEN came in at 400th.
Across the 500 companies and 24 countries represented in the EMEA ranking, average revenue growth over four years was 1,024%. The 22 companies from Ireland recorded broadly similar growth of 1,016%.
Irish businesses performed particularly strongly, with Mail Metrics and Klearcom ranking 54th and 74th respectively. Mail Metrics provides customer communications solutions for regulated sectors, while Klearcom specialises in global voice and IVR testing.
The results come as applications open for Deloitte Ireland’s 2026 Technology Fast 50, which recognises the island’s fastest-growing indigenous technology companies based on four-year revenue growth.
Grace Cartin, Deloitte partner in Belfast, said: “Our homegrown tech sector continues to prove itself on the global stage, and the five local companies that have been highlighted in the Deloitte EMEA Technology Fast 500 demonstrate how innovative and ambitious Northern Ireland businesses can be.
"Applications for the 2026 Fast 50 rankings are now open for businesses across the island, offering an excellent opportunity for ambitious tech firms to showcase their capabilities.”
Laura Haldane, co-founder and chief revenue officer of Northern Ireland-based SciLeads, added: “We’re an organisation that loves data, which is why we’re strongly aligned with the objectivity of the Deloitte Fast 50 awards.
"We’ve ranked for 5 years in a row, and that is purely based on our revenue growth. It’s a valuable and credible recognition for us when we meet with new clients, and an opportunity for us to pause and celebrate how we’re building our business.”
Applications for the 2026 Fast 50 close on September 25, with winners to be announced at a ceremony in Dublin on November 26.