It is the first time in 25 years that a company from Northern Ireland has topped Deloitte’s Fast 50

StormHarvester’s system analyses data from thousands of sensors to help wastewater utilities predict and prevent issues like flooding and pollution.

The Deloitte Technology Fast 50 Awards, which took place in Dublin on Thursday, are one of the island of Ireland’s top technology award programmes.

It ranks the 50 fastest-growing technology companies based on revenue growth over a four-year period. Previous winners include Wayflyer and Swoop.

There were nine companies from Northern Ireland on the 2025 Fast 50 ranking: StormHarvester, Fibrus, Halo Technologies, TeamFeePay, Catagen, Barclay Communications, SciLeads, LocateaLocum and Syndeo.

It is the first time in 25 years that a company from Northern Ireland has topped the Fast 50, since Newry-headquartered First Derivatives took the top spot.

Last month, StormHarvester was named IT Services Company of the Year at the 2025 Belfast Telegraph IT Awards.

Brian Moloney, founder and CEO of StormHarvester, said: “Achieving the top spot in Deloitte’s Fast 50 ranking is a really special moment for all the team at StormHarvester.

“What started as an idea over 10 years ago in Australia for a solution that would reduce the impact of flooding has grown into a proud Belfast-based business that is going from strength to strength.

“In the last year alone, our funding has enabled us to double our headcount, which will help us fuel our expansion further and create even more exciting opportunities in Ireland.

“The Deloitte Fast 50 Awards recognition is a chance to pause, reflect and celebrate all that we have achieved and all that we plan to achieve in the years ahead.”

Aisléan Nicholson, partner and Fast 50 lead for Deloitte in Belfast, said: “Congratulations to all the companies whose dedication and approach to innovation have earned them a well-deserved place on this year’s list – particularly to StormHarvester, who are the second Northern Irish company to take the top spot since the programme began 26 years ago.

“Northern Ireland’s reputation as a hub for creative, homegrown technology continues to strengthen, and the achievements of those featured in the Fast 50 showcases the talent, expertise, and vision driving our local tech sector forward.”