Ecosystem structure
Around 705 UK companies have semiconductor activity. This page explains what kinds of business they are and where each sits in the value chain.
Last reviewed: 21 August 2026
The 2026 Government sector study identifies 705 companies: 295 dedicated semiconductor businesses, for which semiconductors are the core activity, and 408 diversified companies with semiconductor-related capability alongside other work. Around 89% of the dedicated companies are small or medium-sized, and roughly 70% are UK-headquartered.
No public register of UK semiconductor companies is maintained, so this site sets out the structure of the ecosystem rather than an unverifiable list of named firms.
Companies that design chips, or license reusable design blocks and processor architectures to others, without owning fabrication plants. This is the UK's most internationally significant segment and the reason UK-originated designs appear in devices manufactured worldwide.
Fabless, semiconductor IP, EDA, chip architecture
Businesses working with materials such as gallium nitride, silicon carbide and gallium arsenide, which outperform silicon in power handling, high-frequency operation and light emission. South Wales hosts what Government analysis describes as the world's first compound semiconductor cluster.
GaN, SiC, GaAs, epitaxy, power electronics, RF
Companies building components that generate, guide and detect light on semiconductor platforms, used in data communications, sensing, quantum technologies and increasingly in AI interconnect.
Silicon photonics, PICs, optical interconnect
Smaller-scale wafer processing, pilot lines and open-access cleanrooms serving prototyping and specialist production, rather than leading-edge high-volume logic manufacture.
Foundry, wafer, cleanroom, MPW
Businesses that turn finished wafers into working, reliable products — dicing, packaging, interconnection and testing. Packaging has become a competitive frontier as gains from shrinking transistors slow.
Advanced packaging, chiplets, heterogeneous integration
Suppliers of substrates, process chemicals, deposition and characterisation tooling, and the measurement capability that manufacturing depends on. Much of this activity is upstream and research-adjacent.
Substrates, deposition, characterisation, metrology
Companies developing accelerators, inference chips, neuromorphic devices and memristive architectures aimed at the compute demands of artificial intelligence — the segment most directly addressed by current Government policy.
Accelerator, inference, neuromorphic, memristor
Firms whose primary business is elsewhere — aerospace, defence, automotive, medical devices, communications — but which carry meaningful in-house semiconductor design or manufacturing capability. The 2026 study counts 408 such companies.
Diversified, systems integration, embedded
Leading-edge logic manufacturing requires capital expenditure at a scale only a handful of companies worldwide sustain. The UK's comparative advantage instead lies in design, materials science and specialist device physics — capability grounded in universities and research institutions, commercialised through spin-outs, and exported as intellectual property or high-value specialist components.
That model produces disproportionate global influence relative to the sector's headcount, but it also concentrates risk: scale-up capital, access to affordable fabrication, and skills supply are the constraints the sector most consistently reports.
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Acquire or License this DomainUK semiconductor clusters
Where these companies are concentrated, region by region.
Sector overview
Revenue, GVA, employment and growth expectations.
Semiconductor glossary
Definitions for fabless, foundry, compound semiconductor and more.
Primary sources
Government and institutional sources used across this site.