Global Compound Semiconductor

What Global Compound Semiconductor does

Global Communication Semiconductors, LLC (GCS) is a pure-play III-V compound semiconductor wafer foundry founded in August 1997 in Torrance, California, and held out as the first dedicated III-V pure-play foundry in the industry. The operating company sits beneath a Cayman Islands holding entity, GCS Holdings, Inc., which has been listed on the Taipei Exchange under stock code 4991 since September 2014. GCS manufactures customer designs on 4-inch and 6-inch (GaAs/GaN/Si) production lines using a self-developed process portfolio that spans GaAs InGaP HBT (including Super High fmax SD2/SPD >140 GHz), GaAs pHEMT (0.15-0.5 µm), GaN-on-SiC and GaN-on-Si HEMT, InP HBT (DHBT3/3B/5, fT up to 340 GHz, in production since 2007), patent-protected AlN/ScAlN BAW filters, monolithic THz Schottky diodes (fco >1 THz), hyperabrupt GaAs varactors, integrated passive devices, and a GaN/SiC and GaN/Si power-electronics foundry process.

The company serves fabless RFIC/MMIC design houses, optical communications and datacom component companies, power-electronics device makers, 5G infrastructure and defense/aerospace RF customers, and IDMs/Tier-1 OEMs requiring customer-proprietary process transfer. Its go-to-market combines direct enterprise sales from Torrance, international sales representatives in China, Israel and Japan, optical-chip distributors in China and Taiwan, EDA-vendor partner channels (Keysight EEsof Foundry Partners, Cadence Microwave Office PDKs) and event-driven demand generation anchored by annual exhibition at IEEE IMS, supplemented by CIOE, OFC and GOMACTech. Revenue is generated primarily through quote-based wafer foundry services and multi-project-wafer (MPW) prototype runs, complemented by customer-proprietary process manufacturing engagements, GCS-branded Known Good Die™ optical chip product sales (PIN photodetectors, VCSELs) and D-Tech APD product sales.

Reported USD sales grew from $43.36M in 2023 to $54.50M in 2024 and $70.40M in 2025 (+29.2% YoY), with Q1 2026 at $22.60M (+57.1% YoY) and YTD-through-May 2026 at $36.66M (+60.8% YoY) — the strongest stretch in the company's reported history. The group structure includes wholly-owned D-Tech Optoelectronics, Inc. (APD focus, acquired July 2017), majority-owned Xiamen Global Advanced Semiconductor Co., Ltd. (China fab, 51% since June 2018) and wholly-owned Global Device Technologies, Co., Ltd. (established April 2015). Quality and security credentials include ISO 9001 (1999), AS9100 aerospace certification, ITAR registration and a published Conflict Minerals Policy.

Name

Global Compound Semiconductor

Legal name

Global Communication Semiconductors, LLC

Website

https://gcsincorp.com

Company type

Public

Founded year

1997

Operating status

Operating

Headcount range

101–250 employees

Short description

Global Communication Semiconductors, LLC (GCS) is a US-based pure-play III-V compound semiconductor wafer foundry (GaAs, InP, GaN) serving fabless RFIC/MMIC, optoelectronics, power-electronics and defense/aerospace customers with proprietary process modules, MPW prototyping and customer-proprietary process transfer.

Ownership category

akta.pro rank

Product category

Compound Semiconductor Wafer Foundry Services

NAICS

Semiconductor and Related Device Manufacturing (334413)

SIC

Semiconductors & Related Devices (3674)

akta.pro primary industry

RF & Compound Semiconductor Foundries (GaAs/GaN/SiGe) (HDAHACAD)

akta.pro secondary industry

Compound Semiconductor Wafers & Substrates (SiC/GaN/GaAs/InP/Sapphire) (HDAHAGAB)

Keywords

• Compound semiconductor foundry
• Wafer fabrication services
• III-V semiconductor manufacturing
• GaAs InP GaN processes
• RFIC MMIC foundry

Headquarters

HQ city

Torrance

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Infrastructure, Technology or R&D, Operations, Supply Chain, Marketing or Sales

Revenue model

1. Pure-Play Wafer Foundry Services: Core revenue stream from III-V compound semiconductor wafer foundry services (GaAs, InP, GaN-on-SiC, GaN-on-Si), where customers supply designs/GDSII and GCS fabricates wafers using its proprietary process modules. Includes GaAs & GaN RF wafer foundry, InP HBT wafer foundry, Optoelectronics wafer foundry, and Multi-Project Wafer (MPW) prototype runs.
2. Customer Proprietary Process Manufacturing: Revenue from transferring and running customer-owned proprietary process technologies in GCS's fab, including GaAs, GaN and Optoelectronics processes transferred from Tier-1 customers and brought up to volume production.
3. Optical Chips Product Sales (GCS Known Good Die): Revenue from GCS-branded GaAs and InGaAs PIN photodetectors, VCSEL chips/arrays and APDs sold as Known Good Die to fiber-optic communications, datacom and 3D-sensing customers via direct sales and regional distributors.
4. Advanced Optoelectronics Components (AOC): Sales of proprietary optical wafers and Advanced Optoelectronics Components, complementing foundry services with GCS-designed products.

Pricing tiers

Go-to-market motion5 records

Distribution channels6 records

Marketing channels6 records

Core offering

GCS is a pure-play III-V compound semiconductor (GaAs, InP, GaN) wafer foundry service provider founded in 1997, offering concept-to-volume-production wafer fabrication for RFIC/MMIC, optoelectronics, and power-electronics customers. It also sells its own GCS-branded optical chip products — GaAs/InGaAs PIN photodetectors, 850 nm VCSEL chips/arrays, and Avalanche Photodiodes (APDs) — under the GCS Known Good Die™ trademark.

Product overview

GCS offers a single integrated pure-play III-V compound semiconductor wafer foundry platform spanning RFIC/MMIC, optoelectronics, and power-electronics manufacturing. The core offering is foundry services built on a portfolio of proprietary process technologies — GaAs & GaN RF (InGaP HBT including High Linearity P2, High Voltage/GSM P5, VCO, and Super High fmax SD2/SPD HBTs; pHEMT families from 0.15um to 0.5um; HFET; GaN/SiC HEMT; BAW filters; Integrated Passive Devices; THz Schottky; and Varactor diodes), InP HBT (DHBT3/DHBT3B/DHBT5 for high-speed mixed-signal and 5G mmW PAs), GaN-on-Si/SiC power electronics, and Optoelectronics (PIN photodetectors, APD, VCSEL). These are delivered through four foundry service lines — GaAs & GaN RF Wafer Foundry, InP HBT Wafer Foundry, GaN & SiC Power Electronic Wafer Foundry, and Optoelectronics Wafer Foundry — supported by Customer Proprietary Process Manufacturing, Process Design Kits (PDKs), MPW prototype runs, on-wafer DC/RF testing services, and a foundry training course. Branded products include the GCS Known Good Die™ PIN photodetector family and 850 nm VCSEL chips/arrays.

Differentiator

Problem solved

Functional benefit

Brands

• GCS Known Good Die: Trademarked brand for GCS's proprietary line of high-performance, high-speed PIN photodetectors and photodetector arrays manufactured from GaAs and InP.

Products and services

• Pure-Play III-V Compound Semiconductor Wafer Foundry Services ISO-certified pure-play III-V (GaAs, InP, GaN) wafer foundry service delivering concept-to-volume-production manufacturing for fabless RFIC/MMIC, optoelectronics and power-electronics customers. Combines proprietary process modules, PDKs, MPW prototyping, on-wafer testing, foundry training and customer proprietary process transfer.
• GaAs & GaN RF Wafer Foundry Foundry service for RFIC/MMIC designs using GCS's proprietary GaAs and GaN RF process modules including high-power/high-linearity InGaP HBT, pHEMT, GaN HEMT, BAW and RF Integrated Passive Devices (IPD). Serves wireless handsets, base stations, WLAN, 5G, mmW, defense and EW customers.
• InP HBT Wafer Foundry Two generations of InP HBT processes with fT from 110 GHz to 340 GHz enabling very high-speed mixed-signal ICs and 40–100G Transimpedance Amplifiers for optical fiber communications and 5G mmW PAs. In production since 2007.
• GaN & SiC Power Electronic Wafer Foundry Foundry service for power-electronics devices built on 0.5 µm GaN/Si and 0.5 µm GaN/SiC processes, targeting solar inverters, wind turbines, traction, UPS, motor drives, and HEV/EV applications.
• Optoelectronics Wafer Foundry Wafer foundry service for customized optoelectronic devices — photodetectors, photodetector arrays, APDs, lasers, VCSELs, GaN LEDs, RCLEDs, modulators, SOAs and CPV solar cells — for both prototype engineering and volume production.
• Customer Proprietary Process Manufacturing Service for transferring tier-1 customer proprietary process technologies (including GaAs, GaN and Optoelectronics) into volume production on GCS's secured, ITAR-registered, ISO- and AS9100-certified foundry line.
• GCS Known Good Die™ GaAs & InGaAs PIN Photodetectors & Arrays GCS-branded high-performance high-speed Known Good Die PIN photodetectors and arrays manufactured from GaAs (850 nm) and InGaAs/InP (1310/1550 nm), planar and mesa devices supporting up to 800 Gb/s. Qualified for datacom, telecom, AOC, 3D sensing and LiDAR applications.
• VCSEL Chips & Arrays (850 nm) High-speed 850 nm multimode VCSEL chips and linear arrays (1x4, 1x8, 1x12) supporting up to 400 Gbps data communications including AOC, optical USB and HDMI applications. RoHS compliant with 100% Known Good Die testing.
• Avalanche Photodiodes (APD) Avalanche photodiodes supplied under the D-Tech Optoelectronics brand (a GCS subsidiary acquired July 2017), serving optical communications and sensing customers.

Quantifiable outcome

• 2025 sales of $70.40 million, +29.2% YoY
• +4 more outcomes

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature11 records

Partnerships

15 partnerships are on record, tiered minor, core and flagship.

• IntengentminorStrategic or Co-development Partner · 26 January 2018Partnered with Intengent and VLC Photonics on one-stop fabless development services for InP Photonic Integrated Circuits (PICs), announced January 26, 2018.
• VLC PhotonicsminorStrategic or Co-development Partner · 26 January 2018Co-partner with GCS and Intengent on one-stop fabless development services for InP Photonic Integrated Circuits, announced January 26, 2018.
• Epistar CorporationcoreStrategic or Co-development Partner · 1 January 2018Signed a Strategic Cooperation Agreement with Epistar in 2018, announced at GCS investor materials and detailed in a GCS Newsletter PDF.
• MACOMcoreStrategic or Co-development Partner · 1 January 2013MACOM extended GaN leadership with the industry's first dual-source supply chain in 2013, naming GCS as the second source for GaN devices.
• NitronexminorStrategic or Co-development Partner · 1 November 2011Partnership with GCS announced November 2011 giving GCS a capacity advantage in the rapidly growing GaN RF market.
• Keysight Technologies IncflagshipTechnology or IntegrationKeysight is a leading EDA supplier for high-frequency, RF and microwave design. GCS is a member of the Keysight EEsof EDA Foundry Partners program; GCS PDKs (including signoff verification support announced in 2024) are delivered for Keysight Advanced Design System (ADS) and IC-CAP for device modeling.
• Cadence Design SystemsflagshipTechnology or IntegrationCadence provides Microwave Office, Virtuoso and Assura/Diva/Dracula DRC/LVS tools. GCS supports foundry design kits for Cadence Microwave Office to enable simulation, layout and verification aligned with GCS process technologies.
• D-Tech Optoelectronics, Inc.coreStrategic or Co-development PartnerAcquired 100% by GCS LLC in July 2017 in cash; operates as a wholly-owned subsidiary in Taiwan. Co-exhibited with GCS at CIOE 2018 in Shenzhen. Listed on APD product page as a related-entity brand.
• San'an Optoelectronics Co., Ltd.coreStrategic or Co-development PartnerFormed a joint venture, Xiamen Global Advanced Semiconductor Co., Ltd., in November 2016 (originally 49% GCS ownership). In June 2018, GCS acquired an additional 2% to increase ownership to 51%, making the JV a subsidiary. Prior proposed merger with SAIC Acquisition (a San'an subsidiary) was terminated in August 2016.
• Gateway Tech Company LimitedminorChannel Partner/ Reseller/ DistributorChina-region wireless sales representative; contact Phone 0755-86081010, Mobile 0755-86081021, Email [email protected].
• LIYAM Electronics LtdminorChannel Partner/ Reseller/ DistributorIsrael-region wireless sales representative; contact Shlomo Ovadia, Phone +972 36413872, Email [email protected].
• YMS-NETWORKS CO., LTDminorChannel Partner/ Reseller/ DistributorJapan-region wireless sales representative; contact Shinjiro Ochi, Phone 81-465-46-7094, Email [email protected].
• WFCL (Prohubs)minorChannel Partner/ Reseller/ DistributorLocal distributor in mainland China focused on fiber optical communication and related industries; headquartered in Shenzhen with sales offices in Wuhan, Shanghai, Chengdu and Xiamen. Contact Shugang Wang, Tel 86-755-26037700.
• Koryo Co., Ltd.minorChannel Partner/ Reseller/ DistributorProfessional IC agent in Taiwan providing both components and total solutions with FAE technical services. Contact Max Chiang, TEL +886-2698-1143 #117.
• Chinatrust Commercial Bank (Stock Transfer Agent)minorOthersStock transfer agent and shareholder services provider for GCS Holdings, Inc. Address 3F, No. 83, Sec. 1, Chung Ching S. Rd., Taipei 100, Taiwan; Tel 866-2-6636-5566.

Scale indicators9 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Wolfspeed: US-based pure-play SiC and GaN power/RF device company operating its own fabs and recently transitioning to a fab-light model. Wolfspeed overlaps with GCS in GaN-on-SiC RF and GaN power electronics, and represents both a competitor and a potential process-transfer partner.
• OMMIC (MACOM): France-based III-V (GaAs, InP, GaN) wafer foundry acquired by MACOM, serving mmWave, aerospace and defense customers. As part of MACOM (which named GCS as its dual-source for GaN), OMMIC competes with GCS in European mmWave and defense GaN/InP foundry services.
• Sumitomo Electric Device Innovations (SEDI): Japanese GaAs/GaN device manufacturer and foundry providing HBT, pHEMT, and GaN HEMT processes for wireless and defense customers. SEDI is a long-standing III-V incumbent that overlaps with GCS's wireless foundry service portfolio.
• GlobalFoundries: Broad semiconductor foundry offering RF SOI, SiGe, and 45RFSOI processes for wireless and mmWave applications. GlobalFoundries competes more broadly in RF/wireless foundry but lacks GCS's depth in III-V compound semiconductors.

Emerging players

• Tower Semiconductor: Specialty analog/RF foundry (now part of Intel) offering SiGe BiCMOS, RF SOI, and silicon photonics processes. Tower overlaps with GCS in RF and emerging silicon photonics foundry but does not specialize in III-V compound semiconductors.

Direct peers

• IntelliEPI: Texas-based MBE-grown III-V epitaxial wafer foundry offering GaAs, InP, GaSb, and related epiwafer services. IntelliEPI competes in the upstream III-V materials/foundry layer, with overlap in InP HBT and GaAs HBT/pHEMT epi supplied to RFIC and optoelectronics customers.
• Visual Photonics Epitaxy (VPEC): Taiwan-based III-V epitaxial wafer and foundry service provider for GaAs HBT, pHEMT, HBT, and PIN photodetector products. VPEC is a direct competitor in the III-V epitaxy/foundry services space with overlapping process technology and customer base.
• WIN Semiconductors: Taiwan-based pure-play GaAs HBT/pHEMT wafer foundry serving RFIC/MMIC customers worldwide. WIN is GCS's closest direct competitor in the III-V pure-play foundry space, offering overlapping GaAs HBT and pHEMT process modules and serving many of the same fabless RF customers.
• IQE plc: UK-based pure-play III-V compound semiconductor wafer foundry supplying GaAs, InP, GaN, and GaSb epitaxial wafers to RF, photonics, and power electronics customers globally. IQE is the largest dedicated III-V epiwafer supplier and competes with GCS across RF and optoelectronics epitaxy.
• Advanced Wireless Semiconductor Company (AWSC): Taiwan-based GaAs pure-play wafer foundry specializing in HBT and pHEMT processes for handset and WLAN applications. AWSC competes head-to-head with GCS in GaAs HBT/pHEMT wafer foundry and serves many of the same RFIC fabless customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/watch?v=bV9nllZDOl0
• LinkedInlinkedin.com/company/global-communication-semiconductors-inc.

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries3 records

Funding overview

Funding rounds3 records

Investors2 records

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M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Global Compound Semiconductor