British Compound Semiconductor Manufacturers (2026)

British compound semiconductor manufacturers produce GaN, SiC, and InP wafers that power 5G infrastructure, electric vehicles, data centres, and photonic systems worldwide. The UK’s South Wales cluster alone exports over 90% of its output and generated £434m in GVA in 2024. These are niche, high-specification products with a global buyer base, and reaching that buyer base efficiently is one of the sector’s defining growth challenges.

The UK’s Strategic Position in Compound Semiconductors

The UK occupies a specific and defensible position in the global semiconductor supply chain. It is not trying to compete with TSMC on silicon volume. Instead, British manufacturers have built expertise in compound semiconductor materials: GaN (gallium nitride), SiC (silicon carbide), InP (indium phosphide), and GaAs (gallium arsenide). These materials handle RF frequencies, high voltages, and optical wavelengths that silicon cannot.

IQE plc, headquartered in Cardiff, is the most prominent example. The company supplies approximately 55% of the world’s outsourced compound semiconductor epitaxial wafers. Its revenue reached approximately £97m in 2025, at the upper end of forecasts, driven by photonics demand from AI data centres, military and defence contracts in the US, and new handset introductions. IQE’s wafers go into the devices people carry, the satellites overhead, and the base stations that handle 5G traffic.

South Wales is home to what CSconnected describes as the world’s first dedicated compound semiconductor cluster. By 2025, the cluster had grown to support roughly 3,000 high-value jobs, invested £850m in facilities, and generated over £434m in GVA for the UK economy. More than 90% of that output is exported. The cluster’s anchor companies are IQE, Vishay (Newport Wafer Fab), KLA (SPTS Technologies), and Microchip.

Newport Wafer Fab shows how fast capital is moving into this sector. Vishay Intertechnology acquired it from Nexperia in March 2024 for $177m, then committed a further £250m in March 2025 to scale SiC chip production for electric vehicles, renewable energy, and defence. That second investment came with 500+ direct jobs and UK government backing through the Automotive Transformation Fund. Vishay’s COO Roy Shoshani was direct: “We can see there is a real opportunity to play to the UK’s strength in advanced semiconductors.”

What These Manufacturers Actually Make

The product lines break into three core areas, each with its own physics and its own market.

GaN (gallium nitride) wafers and epitaxial structures are the standard for 5G RF. GaN-on-silicon and GaN-on-SiC substrates handle the power densities needed for base station power amplifiers and military radar systems. IQE’s Newport line produces GaN RF epitaxy for handset and infrastructure customers globally.

SiC (silicon carbide) wafers and devices sit at the centre of power electronics. EV inverters, onboard chargers, industrial motor drives, grid-scale power conversion: all of these are switching to SiC because it runs hotter, faster, and more efficiently than silicon. Newport Wafer Fab’s new SiC line targets exactly these applications. According to Yole Group’s compound semiconductor analysis, the SiC device market is on track to reach $10bn by 2029, growing at nearly 13% annually through 2030.

InP (indium phosphide) underpins photonics. High-speed optical transceivers, coherent communications, and increasingly AI data-centre interconnects all rely on InP wafers. IQE flagged higher-than-forecast photonics demand in H2 2025, driven by AI and data-centre growth. The semiconductor laser market, where InP is foundational, is projected to hit $5bn by 2029.

Clas-SiC Wafer Fab in Lochgelly, Fife, gives the UK a second SiC production node outside South Wales. Founded in 2017, it focuses on power applications and gives UK-based customers an alternative supply option for SiC substrates.

Beyond wafer production, the adjacent UK capabilities matter. SPTS Technologies (a KLA company based in Newport) builds the etch and deposition equipment used by compound semiconductor fabs globally. Arm Holdings in Cambridge designs the chip architectures that run in the vast majority of 5G modems and IoT devices that rely on compound semiconductor RF front-ends to function.

The Government’s £1bn Bet

The UK National Semiconductor Strategy, published in 2023, committed up to £1bn over a decade to maintain the country’s position in compound semiconductors, chip design, and R&D. The near-term allocation was up to £200m over 2023-2025, directed at infrastructure access, talent pipelines, and prototyping capability.

For manufacturers, the strategy matters less as direct funding and more as a signal of sustained government intent. The establishment of a £160m Investment Zone in Cardiff and Newport, focused specifically on semiconductors, confirms that South Wales is being backed as a long-term manufacturing hub rather than a transitional cluster.

CSconnected’s 2025 ambition is to double the cluster to £1bn in revenue and add another 3,000 jobs by 2030. A £55m pilot foundry at Swansea University is part of the infrastructure underpinning that target.

For buyers, this means a cluster with real depth: multiple foundries, equipment suppliers, university R&D institutions, and a growing SME supply chain all concentrated within about 30 miles in South Wales, plus nodes in Cambridge, Edinburgh, and Sheffield.

Who Buys British Compound Semiconductors

The buyer base is global and fragmented. Five distinct groups drive most of the commercial volume.

5G infrastructure OEMs buy GaN RF epitaxial wafers for base station power amplifiers. Ericsson, Nokia, Samsung Networks, and Huawei are the largest by volume. Their procurement teams sit in Sweden, Finland, South Korea, and China. No UK trade show is going to put you in front of all of them.

Automotive Tier 1 suppliers are qualifying SiC-based power modules for EV drivetrains. Bosch, Continental, and Aptiv run multi-year qualification processes. They want a technical relationship established before the formal RFQ lands. Showing up at an exhibition with a brochure at that stage does nothing.

Defence primes buy GaN-on-SiC wafers for radar and electronic warfare systems. Raytheon, BAE Systems, and L3Harris are the main names. This market runs on contracts and long-term relationships, but it is very active. IQE’s H2 2025 outperformance was partly driven by faster-than-expected US military funding releases.

Data centre hyperscalers and optical transceiver manufacturers need InP wafers for high-speed photonics. Google, Microsoft, Amazon, and Meta are all running programmes to bring AI interconnect hardware in-house, and they need high-performance InP substrates to do it.

Industrial and energy buyers, including power converter manufacturers, wind turbine inverter makers, and railway traction suppliers, are moving to SiC for grid-connected applications. This is a slower-moving procurement cycle but a large addressable market.

Each group sits in a different country, uses a different procurement process, and expects a different opening conversation. A British compound semiconductor manufacturer trying to reach all five through trade fair attendance and referral networks is fighting the structure of its own buyer base.

Conventional Sales Channels: Where They’re Falling Short

Most compound semiconductor manufacturers built their sales pipelines through a small number of channels that worked well when the industry was smaller. Those channels are showing strain as the market grows faster than the sales infrastructure.

SEMICON Europa (Munich, November annually) and CS Mantech are the sector’s primary trade shows. A typical floor presence at SEMICON Europa runs £25,000-£60,000 once you account for the stand, travel, hotels, and staff time. The audience skews toward engineers and equipment suppliers rather than procurement decision-makers. Qualified buyer conversations per show rarely exceed single digits.

Direct field sales is expensive at this technology level. A UK-based technical sales manager covering European and North American accounts costs £90,000-£130,000 in base salary before commissions, travel, and support costs. Coverage is thin because the same person needs to handle 20 countries.

UK government trade missions through the Department for Business and Trade run periodically for the semiconductor sector, but the format does not generate qualified buyer introductions at scale. They work for market orientation, not pipeline generation.

Distributor relationships exist but are limited for compound semiconductors. Unlike commodity silicon, compound wafers and epitaxial structures require application engineering support. A distributor adding 20-30% margin while providing limited technical support is a poor fit for buyers making multi-year supply decisions.

Referral networks built up over 20-30 years served IQE and a small number of other established players well. For newer entrants, Clas-SiC, Space Forge, or SMEs in the CSconnected supply chain, those relationships take years to build and don’t scale.

Cold outreach across multiple continents in multiple languages is almost entirely absent from how compound semiconductor companies sell. The sector’s commercial culture defaults to inbound and conference-circuit networking. That works at the scale of the 1990s and 2000s industry. It is running out of road as the addressable market triples and the buyer base globalises.

The result is a recurring pattern: strong technology, thin pipeline. Companies with world-class GaN or SiC process capability that can’t reliably get in front of the procurement teams making supplier decisions for the next generation of products.

Building Pipeline at the Technical Buyer Level

Compound semiconductor procurement decisions involve multiple stakeholders: process engineers who qualify materials, procurement managers who run RFQ processes, and senior engineering leadership who set supplier strategy. The buying cycle for a new epitaxial wafer supplier can run 12-24 months, from first contact to qualified supply agreement.

What works in this environment is sustained, technically grounded outreach that reaches the right person at the right company at the right point in their qualification cycle. That is hard to do manually at scale, particularly across multiple geographies and buying personas.

AI-powered outbound systems handle this by building large, verified lists of target accounts, identifying the correct technical and procurement contacts, and generating personalised outreach at each level of the buying organisation. Unlike a trade show where you hope the right buyer walks past your stand, a well-configured outbound engine reaches specific people at named accounts with messages calibrated to their role and company context.

papaverAI’s Growth Engine is built specifically for manufacturers in technically complex sectors. The cost per qualified lead runs $150-$300, depending on sector and geography. That compares to £300-£900+ per qualified lead at major trade shows when you account for full show costs, or £500-£1,200+ per lead through field sales at standard conversion rates.

The compound semiconductor sector’s buyer geography makes the comparison starker. A GaN RF wafer manufacturer trying to reach procurement teams at Nokia Networks in Finland, Samsung Networks in South Korea, and Raytheon in the US simultaneously cannot do that cost-effectively through field sales or trade show attendance. An outbound engine running in parallel across all three geographies can.

See how the system works or read how we’ve approached this for UK optical and electronics manufacturers and UK electrical and electronics exporters.

For broader context on UK manufacturing export dynamics, the United Kingdom sector overview covers the full range of industries where we’ve seen this approach work.

---

Frequently Asked Questions

What are the main sub-sectors within British compound semiconductor manufacturing?

The main sub-sectors are: GaN RF and power (for 5G base stations, defence radar, and EV chargers), SiC power devices (for EV inverters, industrial drives, and energy conversion), InP photonics (for data-centre transceivers and AI interconnects), and GaAs RF (for mobile handset front-ends). Each has a different buyer base and different qualification process.

Where are British compound semiconductor manufacturers located?

The largest concentration is in South Wales, centred on Cardiff and Newport, where CSconnected links IQE, Newport Wafer Fab (Vishay), SPTS (KLA), Microchip, and 50+ SMEs. A second cluster exists around Cambridge, with Arm Holdings and several photonics-focused spinouts. Clas-SiC operates in Lochgelly, Fife. University research nodes are active in Sheffield, Manchester, and Edinburgh.

How does the UK’s compound semiconductor cluster compare globally?

CSconnected is the world’s first dedicated compound semiconductor cluster. IQE alone supplies approximately 55% of global outsourced epitaxial wafers. The UK’s position is strongest in GaN RF, InP photonics, and SiC power. It is not a high-volume silicon foundry competitor; its strength is in specialised compound materials where process expertise and IP matter more than fab scale.

What is the UK government investing in compound semiconductors?

The National Semiconductor Strategy, published in 2023, commits up to £1bn over a decade. Near-term spending was up to £200m over 2023-2025. A £160m Investment Zone in Cardiff and Newport focuses specifically on semiconductor manufacturing. Vishay’s £250m Newport Wafer Fab SiC expansion was backed by the Automotive Transformation Fund. A £55m pilot foundry at Swansea University targets early-stage material development.

How do British compound semiconductor makers typically find new customers?

Historically through SEMICON Europa trade show attendance, long-standing direct relationships, UK government trade missions, and technical conference presentations. These channels work for existing accounts but generate limited new pipeline. The sector is increasingly looking at structured outbound as a way to reach procurement teams and technical decision-makers at target accounts globally, particularly in Asia-Pacific and North America where buyer concentrations are highest.