EXTOLL GMBH

Their core work

EXTOLL is a German SME that develops high-performance interconnect and network technology for supercomputers and extreme-scale computing systems. They design specialized hardware — network adapters and communication architectures — that allow processors in large computing clusters to exchange data at very high speeds with low latency. Their work feeds directly into Europe's ambition to build sovereign, energy-efficient exascale computing infrastructure, contributing interconnect IP to major European processor and HPC initiatives.

What they specialise in

How they've shifted over time

EXTOLL's early H2020 work (2017–2018) centered on fundamental exascale computing infrastructure: co-design methodologies in DEEP-EST and contributing to the European Processor Initiative's first grant agreement. From 2021 onward, their focus visibly shifted toward energy-efficient, AI-ready computing — with eProcessor, RED-SEA, and The European PILOT all emphasizing power efficiency, machine learning acceleration, and open-source hardware approaches. This mirrors the broader European HPC community's pivot from raw performance toward sustainable, sovereign, AI-capable computing.

EXTOLL is moving toward energy-efficient, AI-optimized network hardware for European sovereign computing platforms — expect continued involvement in EuroHPC and open-source processor initiatives.

How they like to work

EXTOLL operates exclusively as a specialist participant, never coordinating projects — consistent with a hardware IP company that contributes deep technical components rather than managing large consortia. With 63 unique partners across 19 countries in just 5 projects, they work in very large European consortia (averaging 12+ partners per project), typical of flagship HPC infrastructure programs. This means they are well-networked and accustomed to integrating their technology into complex multi-partner systems.

Remarkably broad network for an SME: 63 unique partners across 19 countries from only 5 projects, reflecting participation in large flagship European computing programs. Their partners likely include major European HPC centers, processor designers, and research institutions.

What sets them apart

EXTOLL occupies a rare niche: a European SME with proprietary high-performance interconnect technology for supercomputers. While most HPC network hardware comes from large US corporations (InfiniBand vendors like NVIDIA/Mellanox), EXTOLL provides a European-sovereign alternative — which is precisely why they appear in nearly every major European processor and exascale initiative. For consortium builders in HPC or European digital sovereignty projects, EXTOLL brings irreplaceable hardware IP that few other European SMEs can offer.

Highlights from their portfolio

• DEEP-EST
  Largest single grant (€1.65M) — a flagship exascale computing project focused on modular supercomputer architectures, where EXTOLL's interconnect technology was a critical infrastructure component.
• EPI SGA1
  Part of the European Processor Initiative, Europe's strategic effort to develop sovereign processor technology — signals EXTOLL's role in continental-level digital independence programs.
• The European PILOT
  Most recent major project (2021–2026, €899K), combining open technologies with energy efficiency and ML acceleration — represents EXTOLL's current strategic direction.