22 tech companies in Ireland rank among fastest-growing firms in Deloitte EMEA Fast 500

Over 20 technology companies in Ireland have ranked in the Deloitte 2025 EMEA Technology Fast 500, which recognises the 500 fastest-growing technology companies across Europe, the Middle East and Africa, positioning Irish innovators alongside some of the world’s most dynamic tech leaders.

Across all 500 companies and 24 countries, the average revenue growth rate over four years was 1,024.47%. The 22 companies from Ireland were on par at 1,016.48%.

StormHarvester ranked highest among the companies in Ireland, at 24th on the list, with a revenue growth rate of over 3,012.4%.

The Belfast-based company, which has developed an advanced anomaly detection system to help wastewater utilities predict and prevent issues like flooding and pollution, was also the 2025 winner of Deloitte Ireland’s Technology Fast 50.

In the Fast 500 ranking, Irish companies Mail Metrics and Klearcom also placed in the top 100, ranking 54th and 74th, respectively. The companies also came in at second and third in last year’s Deloitte Fast 50 ranking in Ireland.

Mail Metrics provides customer communications solutions to organisations operating in regulated sectors, while Klearcom provides global voice and IVR testing capabilities to organisations with a dependency on customer communication.

In the previous year, 20 companies in Ireland were included in the Fast 500 rankings, with the Irish fintech Wayflyer ranking the highest at number 43.

These results underline the continued strength of Ireland’s indigenous technology sector in a highly competitive global market.

Applications for Deloitte Ireland’s 2026 Technology Fast 50 are now open

The Deloitte Fast 50 is one of Ireland’s foremost technology awards, ranking the country’s fastest-growing indigenous technology companies by revenue growth over four years.

Ireland has been home to approximately 10 technology unicorns, which is a reflection of the strength of the country’s start-up and scale-up community.

Several of these unicorns, including LetsGetChecked, Flipdish, Fenergo, Wayflyer, and Tines, are alumni of Deloitte’s Technology Fast 50 programme, highlighting its strong track record of identifying future high-growth success.

James Toomey, Fast 50 lead and Deloitte Ireland partner, said:

“The Deloitte EMEA Technology Fast 500 continues to highlight the exceptional strength of Ireland’s homegrown tech sector. Behind every one of these companies is a team that chose to push a bit further, a bit faster. For a small island, our entrepreneurs consistently deliver outstanding performances on a global stage, and that’s what this ranking really captures.

“It is also a testament to the critical role domestic direct investment (DDI) plays in the resilience of the wider economy and the importance of having supports in place that help more companies like these grow and scale. Congratulations to all the companies in the rankings.

“Applications for the 2026 Fast 50 rankings are now also open, offering an excellent opportunity for ambitious technology companies to join this distinguished group.”

Nick Keegan, founder and CEO of Mail Metrics, said:

“I firmly believe we’re only getting started in Mail Metrics. While we’ve achieved a lot, there is plenty more to come. Being recognised as one of the fastest growing technology companies in the Deloitte EMEA Fast 500 for two years in a row is an incredible recognition, benchmarking our success against leading tech companies across the globe. I pay huge credit to our team and our amazing clients for helping us achieve this.”

Laura Haldane, co-founder and Chief Revenue Officer of SciLeads, said:

“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.”

Application details and further information about the programme can be found here: https://www.deloitte.com/ie/en/Industries/tmt/technology-fast-50-awards.html

The closing date for entries is 25 September and the winners will be announced at a ceremony in Dublin on 26 November 2026.

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