CoolSem Technologies announced the closing of its pre-seed financing round. The round was led by High-Tech Gründerfonds (HTGF), with participation from KBC Focus Fund NV, Brabant Development Agency (BOM), and TTT Green Tech B.V. (managed by SHIFT Invest).
The capital will fund the advancement of the company’s WaLTIS wafer-level thermal management technology from concept to engineering samples. These samples will be validated by customers in the RF, power, and photonics sectors, supporting qualification activities and collection of real-world performance data.
The technology addresses heat management challenges in semiconductors, aiming to reduce energy waste, extend hardware lifespan, and enable reuse of rare materials.
From left to right: Kees Steenbergen – COO, Pieter Heersink – CCO, Andre van Geelen – CEO & CTO, Robbert van der Waal - CSO
André van Geelen, CEO of CoolSem Technologies, stated: “Heat is becoming a fundamental limiting factor in semiconductor performance. In RF, photonics, and power, conventional materials and packaging are approaching their physical limits. The pre-seed round enables us to demonstrate our wafer-level technology with early customers and advance towards industry adoption.”
Olaf Joeressen, Senior Investment Manager at HTGF, commented: “When I first got in touch with CoolSem Technologies I was immediately intrigued by the simplicity and elegance of the approach driven by an outstanding team. I believe the technology has the potential to become an indispensable ingredient to the future thermal design of chips, an area that is more critical to the performance of semiconductor devices than ever before.”
Rudi Severijns, Investment Director at KBC Focus Fund, said: “We were attracted to CoolSem Technologies’ proposition because of its pragmatic and highly compatible approach. The technology integrates seamlessly into existing semiconductor and photonics value chains, enabling rapid experimentation and adoption with minor redesigns at lower cost. Their solution is turning thermal management from a limiting constraint into a scalable design advantage.”
Ivana Sersic, Senior Investment Manager at Brabant Development Agency (BOM), stated: “We are proud to participate in this pre-seed round backed by an international consortium to enable CoolSem Technologies to validate their unique technology further. CoolSem Technologies is offering a solution to tackle thermal bottlenecks in the semiconductor industry that has the potential to unlock new and more powerful electronic chips having higher system performance, better energy efficiency and extended device lifespans.”
Julie van den Brink, Investment Associate at SHIFT Invest, said: “With its strong impact potential and highly capable and driven team, CoolSem Technologies is well positioned for the road ahead, and we are excited to support them on this journey.”
CoolSem Technologies, founded in 2025 and based in Eindhoven, Netherlands, develops wafer-level thermal management technology. Its WaLTIS multilayer stack replaces conventional substrates to reduce thermal resistance and mechanical stress in advanced semiconductor and photonic devices, targeting improved heat flow, mechanical stability, reliability, performance, and device lifetime.
The leadership team includes André van Geelen (CEO & CTO), Kees Steenbergen (COO), Pieter Heersink (CCO), and Robbert van der Waal (CSO).
