The Sunday Times 100 Tech spotlights Britain’s fastest-growing private tech companies and ranks them on sustained growth in annual revenues, measured over a three-year period. Kigen earned a spot, ranking 37 among the hardware category, with an average annual sales growth of 47% over the past three years—highlighting the UK’s momentum in scaling “real-world” technology that touches energy, infrastructure, industrial systems, lifestyle and AI.
What this recognition signals
In the past year, the companies featured have collectively generated £3.7 Billion in revenue. The companies collectively experienced an annual growth rate of 187%. A sister league table to The Sunday Times 100, a ranking of Britain’s fastest-growing private companies, as this listing expands (following its first annual publication in January 2025), Kigen’s recognition reflects a clear signal: the market is rewarding companies that can translate deep engineering into global adoption, especially where security and reliability are non-negotiable. This recognition comes against a backdrop of Kigen’s successful Series B fundraise with Softbank Vision Fund 2, Arm and SBI Group, and scale and ambition across the wider list: last year’s cohort was reported as having raised more than £100bn in investment, with 12 unicorns identified among those featured.
eSIM security and trusted connectivity
Kigen stands out as the only recognised company operating at the intersection of security and eSIM technology—delivering the embedded trust layer that modern products and critical services rely on, from the first activation event to secure lifecycle management in the field. As intelligence scales, connectivity becomes invisible, always-on and increasingly autonomous; making it essential that trust is engineered into devices from day one. Kigen’s mission is to make secure connectivity simple to adopt, universal to deploy, and reliable at scale, so manufacturers and enterprises can innovate faster without compromising on security.
“Kigen’s growth is a testimony to how UK companies can become a global powerhouse—shaping the future of the devices, and data we all rely on. The pace of growth required to secure a place on the league table is impressive, and the Kigen team should be proud of this achievement in what have remained challenging trading conditions.” – Richard Tyler, the founding editor at The Sunday Times 100 Tech
“This recognition is a testament to our business growth—driven by our team’s fearless innovation and our partnership in delivering our customers’ success. As AI scales and edge silicon innovation accelerates, people and companies deserve their device data to stay secure. It’s an honour to feature alongside other businesses contributing to the UK’s $1 trillion tech industry, a key driver of economic growth and career opportunities nationwide. We’re proud to be a leading eSIM security company on this list, and our ambitious plans promise even greater advancements.” – Vincent Korstanje, the CEO at Kigen
2025 milestones and global growth
In 2025, Kigen’s eSIM and iSIM technology products gained adoption from global innovation behemoths and underpinned secure connectivity for products central to the energy transition, smarter cities and AI-enabled operations—at scale and with security by design. The business is experiencing growth across the US, Europe and Japan, capitalising on the shift toward industrial manufacturers and enterprises embracing data and AI innovation. Kigen’s latest compact MFF4 form factor eSIM products were natively built into a wide range of devices, including the top five smart-metering manufacturers and satellite- and cellular-connected, smart watches and smartphone brands in the US.
Kigen achieved a world-first with a GSMA SAS-certified IoT eSIM management (eIM) solution for the latest IoT eSIMs at its secure server facility, demonstrably addressing the leading-edge requirements for enhanced security. As a result, Kigen’s eSIMs and server solutions saw adoption from large regional utilities in North America (such as LCRA and Evergy) for the provision of private network rollouts, and multiple nationwide smart-meter rollouts across Europe supporting clean-energy and net-zero targets.
This achievement follows other prestigious recognitions, including the IoT Breakthrough Awards’ IoT Solution of the Year 2025 and the Juniper Research IoT Smart City Innovation Gold award. As they move forward into 2026, they’re committed to ensuring that as more devices and data feed into distributed intelligence,
- Devices benefit from factory-first connectivity globally,
- Devices can be secured and updated at any time,
- Achieving global connectivity remains simple for manufacturers and users.
See more about their latest eSIMs and how they are doing this here.
