'Achieving the top spot is a really special moment': AI-driven software firm is first company from Northern Ireland to lead the Deloitte 2025 Technology Fast 50 ranking for 25 years

Northern Ireland software firm StormHarvester has been announced as the fastest growing technology company in this year’s Deloitte Technology Fast 50 Awards at a ceremony in the Mansion House in Dublin this evening (Thursday).

Based in Belfast StormHarvester uses its advanced anomaly detection system to analyse data from thousands of sensors to help wastewater utilities predict and prevent issues like flooding and pollution.

The Deloitte Technology Fast 50 Awards, now in its 26th year, is one of Ireland’s foremost technology award programmes. It is a ranking of the country's 50 fastest-growing technology companies based on revenue growth over a four-year period. Previous winners include Wayflyer and Swoop.

In total there were nine companies from Northern Ireland on this year’s Fast 50 ranking: StormHarvester, Fibrus, Halo Technologies, TeamFeePay, Catagen, Barclay Communications, SciLeads, LocateaLocum and Syndeo.

StormHarvester showed revenue growth of 2,910% over the qualifying period. It is the first time in 25 years that a company from Northern Ireland has topped the Fast 50, since Newry-headquartered First Derivatives.

Reacting to the win, 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.”

Cumulatively, the Deloitte 2025 Technology Fast 50 winners generated €1.76 billion in total annual revenues. The average growth rate of the companies was 442%. The 50 companies employ over 7,500 people and 12 of the ranked companies were first time winners.

Aisléan Nicholson, partner and Fast 50 lead for Deloitte in Belfast, said: “The Deloitte Technology Fast 50 ranking celebrates innovation and entrepreneurship in the technology sector and recognises tech companies with sustainable revenue growth over four years.

“This data-driven methodology gives the Fast 50 a credibility that sets the programme apart and highlights not just the buzz around a tech company but also their readiness to scale globally.

“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.”

In addition to announcing the ranking of the Fast 50 companies, the Deloitte Technology Fast 50 Awards included several award categories.

Londonderry’s Alchemy won Impact Award in association with Meta. This award recognises a company that has made a significant impact within the current year.

The top 50 were:

StormHarvester 1

Mail Metrics 2

Klearcom 3

Fibrus 4

Altra 5

Tines 6

Aerlytix 7

OneTouch Health 8

HALO Technologies 9

Otonomee 10

TeamFeePay 11

EdgeTier 12

Clear Strategy 13

Swoop 14

CleverCards 15

CATAGEN 16

AccountsIQ 17

GRID Finance 18

Circit 19

Tier3Tech 20

MEG 21

Bright 22

T-Pro 23

Converge-Digital 24

Barclay Communications 25

Dimply 26

Alchemy 27

Phorest 28

Savenet Solutions 29

Kneat Solutions 30

SciLeads 31

Ekco 32

Spectrum.Life 33

MCO 34

CR Payroll Solutions 35

Locate a Locum 36

CameraMatics 37

Nostra 38

ROCTEL 39

Syndeo 40

Ordorite Software Solutions 41

TEKenable 42

Aryza 43

Medihive 44

Regional Broadband 45

SynergySuite 46

Spanish Point Technologies 47

Sim Local 48

Zenotec 49

Core Optimisation 50