# Top 50 companies with in-house R&D in Gyeonggi

Tamtam tracks 56 companies with in-house R&D headquartered in Gyeonggi. This list ranks the 50 largest by number of employees on LinkedIn, led by Samsung Electronics, Samsung Mobile and NAVER Corp. Their median headcount is 637. Half of them were founded in 1987 or later. The most common headquarters are Seongnam (10).

The companies in Gyeonggi with in-house R&D are mostly large firms in electronics manufacturing, automotive, and IT. Samsung Electronics, with 287,000 employees, leads in diverse technology from TVs to medical devices. Other notable companies include NAVER Corp, providing a search portal and metaverse platform, and HL Mando, an automotive parts developer. Samsung SDI specializes in innovative technology products, while Samsung Display offers cutting-edge OLED and QD-OLED solutions.

A clear pattern among these companies is the dominance of the Samsung group, with multiple affiliates contributing to various sectors, from consumer electronics to display technology. Many of these firms also have a long history, with several founded in the 1960s and 1970s, indicating established R&D capabilities in the region.

🇰🇷 Gyeonggi · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Samsung Electronics](https://www.tamtam.ai/c/samsung-electronics) (samsung.com)<br>A global technology leader, constantly innovating in TVs, smartphones, wearables, appliances, medical devices, and more Embracing diversity and creativity for growth | Computers and Electronics Manufacturing | 🇰🇷 Suwon-Si | 287,000 |  |
| 2 | [Samsung Mobile](https://www.tamtam.ai/c/samsung-mobile) (samsung.com)<br>This company specializes in providing secure and highly productive mobile solutions for enterprises, focusing on Android security and productivity on Samsung Galaxy devices worldwide | Consumer Electronics | 🇰🇷 Gyeonggi-do | 19,596 | 1969 |
| 3 | [NAVER Corp](https://www.tamtam.ai/c/naver-corp) (navercorp.com)<br>A global ICT company offering search portal, messenger, camera app, webtoon, metaverse platform, AI, robotics, and mobility innovations for shared growth | Technology, Information and Internet | 🇰🇷 Seongnam-Si | 5,121 | 1999 |
| 4 | [Samsung SDI](https://www.tamtam.ai/c/samsung-sdi) (samsungsdi.com)<br>Development and production of innovative technology products with cutting-edge features, focusing on creativity and continuous improvement since 1970. | Appliances, Electrical, and Electronics Manufacturing | 🇰🇷 Yongin-si | 4,080 | 1970 |
| 5 | [HL Mando](https://www.tamtam.ai/c/hl-mando) (hlmando.com)<br>A leading automotive parts company focused on developing cutting-edge technology and quality parts for safe vehicles on a global scale | Motor Vehicle Manufacturing | 🇰🇷 Seongnam | 3,561 | 1962 |
| 6 | [Samsung Display](https://www.tamtam.ai/c/samsung-display) (samsungdisplay.com)<br>Global leader providing cutting-edge display solutions with OLED and QD-OLED technology for smartphones, TVs, laptops, monitors, smartwatches, VRs, game consoles, and automotive applications. | Appliances, Electrical, and Electronics Manufacturing | 🇰🇷 Yongin-si | 3,443 | 2012 |
| 7 | [Hankook Tire](https://www.tamtam.ai/c/hankook-tire-seongnam-si) (hankooktire.com)<br>Manufacture and supply high-quality tires globally, focusing on innovation, premium brands, and sustainable ESG management practices. | Motor Vehicle Manufacturing | 🇰🇷 Seongnam-si | 2,083 | 1941 |
| 8 | [LINE Plus Corp](https://www.tamtam.ai/c/line-plus-corp) (linepluscorp.com)<br>A global mobile platform company offering a variety of services like search, messaging, media, commerce, fintech, and AI to create amazing everyday experiences | Technology, Information and Internet | 🇰🇷 Bundang-gu | 1,634 | 2013 |
| 9 | [LS Cable & System](https://www.tamtam.ai/c/ls-cable-and-system) (lscns.co.kr)<br>A global cable solutions provider offering state-of-the-art products, engineering services, and global production capacity to power authorities and carriers worldwide | Manufacturing | 🇰🇷 Anyang-si | 1,630 | 1962 |
| 10 | [NEXON KOREA](https://www.tamtam.ai/c/nexon-korea) (company.nexon.com)<br>Develops and services over 40 online games across various genres in more than 190 countries worldwide, expanding gaming experiences. | Computer Games | 🇰🇷 Seongnam | 1,579 | 1994 |
| 11 | [HYUNDAI TRANSYS](https://www.tamtam.ai/c/hyundai-transys) (hyundai-transys.com)<br>A global automotive parts supplier specializing in powertrain and seating components for Hyundai and Kia Motors, with operations in Asia, Europe, and the Americas | Motor Vehicle Manufacturing | 🇰🇷 Hwaseong | 1,566 | 1994 |
| 12 | [Hyundai Rotem](https://www.tamtam.ai/c/hyundai-rotem) (hyundai-rotem.co.kr)<br>A diversified company within Hyundai Motor Group providing innovative and sustainable mobility solutions in the railway, defense, and plant & machinery systems sectors globally | Truck Transportation | 🇰🇷 Uiwang-si | 1,442 |  |
| 13 | [삼성중공업](https://www.tamtam.ai/c/company-96122908) (samsungshi.com)<br>A global leader in shipbuilding and offshore EPC projects, specializing in high-tech vessels like drillships, LNG carriers, FPSOs, and Arctic tankers | Shipbuilding | 🇰🇷 Seongnam | 1,423 | 1974 |
| 14 | [Dankook University](https://www.tamtam.ai/c/dankook-university) (dankook.ac.kr)<br>A leading university in Korea, focusing on grooming young talent and academic advancement with a strong emphasis on industry-university cooperation and innovation in various fields | Higher Education | 🇰🇷 Yong-in | 1,260 | 1947 |
| 15 | [LIG Defense&Aerospace](https://www.tamtam.ai/c/lig-defense-and-aerospace) (ligdefenseaerospace.com)<br>The company develops and produces advanced precision electronic systems, including missile, radar, avionics, communication systems, and more for military and commercial applications globally | Defense and Space Manufacturing | 🇰🇷 Yongin-si | 1,144 | 1976 |
| 16 | [LS Automotive](https://www.tamtam.ai/c/ls-automotive) (lsautomotive.com)<br>A global vehicle components company with world-class quality, offering career opportunities, focused on customer satisfaction, sustainability, and innovation in automotive technologies | Motor Vehicle Manufacturing | 🇰🇷 Anyang-si | 938 | 1973 |
| 17 | [Ajou University](https://www.tamtam.ai/c/ajou-university) (ajou.ac.kr)<br>A higher education institution located in gyeonggi-do, South Korea, specializing in providing advanced education and academic programs | Higher Education | 🇰🇷 Suwon | 898 | 1973 |
| 18 | [LS ELECTRIC](https://www.tamtam.ai/c/ls-electric) (ls-electric.com)<br>This company provides power systems and automated solutions for efficiency, sustainability, and clean energy, focusing on smart factories and energy solutions | Appliances, Electrical, and Electronics Manufacturing | 🇰🇷 Anyang-si | 881 | 1974 |
| 19 | [42dot](https://www.tamtam.ai/c/42dot) (42dot.ai)<br>The company is developing software-defined vehicles using AI for autonomous urban transportation, focusing on user-centric and safe mobility solutions | Software Development | 🇰🇷 Seongnam-Si | 853 | 2019 |
| 20 | [POSCO DX](https://www.tamtam.ai/c/posco-dx) (poscodx.com)<br>A leading provider of total smart industry IT solutions, POSCO ICT offers engineering, automation, system integration, and IT outsourcing services with a focus on green growth and innovation | IT Services and IT Consulting | 🇰🇷 Seongnam-Si | 844 | 1989 |
| 21 | [Gachon University](https://www.tamtam.ai/c/gachon-university) (gachon.ac.kr)<br>An academic institute in South Korea resulting from mergers between four universities, offering multiple campuses and international study opportunities | Higher Education | 🇰🇷 Seongnam | 839 | 1939 |
| 22 | [ANY Corporation](https://www.tamtam.ai/c/any-corporation) (any21.co.kr)<br>Specialized manufacturer in Korea of medical and industrial monitors, offering OEM and ODM services to top companies worldwide ISO 9001 certified for quality assurance | Medical Equipment Manufacturing | 🇰🇷 Seongnam-si | 822 | 1995 |
| 23 | [NAVER WEBTOON](https://www.tamtam.ai/c/naver-webtoon) (recruit.webtoonscorp.com)<br>Platform focusing on webtoons and web novels, discovering diverse content and supporting creators' growth for sustainable ecosystem. | Technology, Information and Internet | 🇰🇷 | 725 |  |
| 24 | [GC Biopharma (GC녹십자)](https://www.tamtam.ai/c/gc-biopharma-gc) (gcbiopharma.com)<br>Biopharmaceutical company based in South Korea specializing in protein therapeutics and vaccines, with a focus on quality healthcare solutions for over 50 years | Pharmaceutical Manufacturing | 🇰🇷 Yongin-si | 660 | 1967 |
| 25 | [Ajou University](https://www.tamtam.ai/c/ajou-university-suwon-si) (ajou.ac.kr)<br>A leading research university in Korea with 10 colleges, focusing on humanity, truth-seeking, and global unity Located in Suwon, near Seoul | Higher Education | 🇰🇷 Suwon | 637 | 1973 |
| 26 | [TMAXSOFT](https://www.tamtam.ai/c/tmaxsoft) (tmaxsoft.com)<br>A global software innovator offering modernization solutions for enterprise CIOs, specializing in enterprise RDBMS, legacy rehosting, and web application servers | Software Development | 🇰🇷 Chicago | 593 | 1997 |
| 27 | [SOLUM](https://www.tamtam.ai/c/solum) (solum-group.com)<br>A global company specializing in power suppliers, tuners, and electronic shelf labels with locations in South Korea, USA, and Germany | Appliances, Electrical, and Electronics Manufacturing | 🇰🇷 Yongin-si | 585 | 2015 |
| 28 | [Hanwha Vision](https://www.tamtam.ai/c/hanwha-vision) (hanwhavision.com)<br>A leading provider in the global video surveillance industry, specializing in optical design, image processing, cybersecurity, AI, and cloud technologies | Security and Investigations | 🇰🇷 Seongnam-Si | 550 |  |
| 29 | [KGM](https://www.tamtam.ai/c/kgm) (kg-mobility.com)<br>A leading Korean automotive manufacturer known for innovative SUVs and luxury sedans, with technical cooperation for competitive SUV production | Motor Vehicle Manufacturing | 🇰🇷 Pyeongtaek | 505 | 1954 |
| 30 | [NEOWIZ](https://www.tamtam.ai/c/neowiz) (neowiz.com)<br>Dedicated team focused on publishing high-quality games like Brown Dust and DJMAX Respect, prioritizing players and offering innovative experiences globally | Computer Games | 🇰🇷 Seongnam | 501 | 1997 |
| 31 | [SK chemicals](https://www.tamtam.ai/c/sk-chemicals) (skchemicals.com)<br>The company manufactures chemical products including PETG and PET resins for various industries, as well as life science products like anti-cancer agents and vaccines | Plastics Manufacturing | 🇰🇷 Seongnam-Si | 491 |  |
| 32 | [HD Construction Equipment](https://www.tamtam.ai/c/hd-construction-equipment) (hd-ce.com)<br>A leading manufacturer of construction equipment, engines, and utility equipment, supplying a range of products for various industries globally | Machinery Manufacturing | 🇰🇷 Seongnam-si | 469 | 1985 |
| 33 | [분당서울대학교병원 (SNUH Bundang Hospital) ®](https://www.tamtam.ai/c/snuh-bundang-hospital) (snubh.org)<br>Leading the way in setting the global standard for healthcare, striving to become the nation's hospital for the people | Hospitals and Health Care | 🇰🇷 Seongnam-si Bundang-gu | 454 |  |
| 34 | [HD Hyundai Construction Equipment](https://www.tamtam.ai/c/hd-hyundai-construction-equipment) (hd-hyundaice.com)<br>Specialized manufacturer of construction equipment including excavators, wheel loaders, backhoe loaders, and skid loaders for construction and material handling | Machinery Manufacturing | 🇰🇷 Seongnam-Si | 416 | 2017 |
| 35 | [WEMADE](https://www.tamtam.ai/c/wemade) (wemade.com)<br>A leading game company in South Korea, creating innovative games and leading the way in blockchain technology, NFT, Defi, and metaverse investments | Computer Games | 🇰🇷 Seongnam | 396 | 2000 |
| 36 | [Ray](https://www.tamtam.ai/c/ray) (raymedical.com)<br>A global leader in dental imaging solutions, Ray Co, Ltd specializes in CBCT technology and digital dentistry products for global markets | Medical Equipment Manufacturing | 🇰🇷 Seongnam-Si | 378 | 2004 |
| 37 | [Hyundai Kefico Corporation (현대케피코)](https://www.tamtam.ai/c/hyundai-kefico-corporation) (hyundai-kefico.com)<br>The company designs, verifies, calibrates, and manufactures advanced electronic control systems for vehicles, with a focus on safety and efficiency | Motor Vehicle Manufacturing | 🇰🇷 Gunpo | 374 | 1987 |
| 38 | [Samsung Foundry](https://www.tamtam.ai/c/samsung-foundry) (samsung.com)<br>Specializing in advanced process and design technologies, Samsung Foundry offers a range of foundry capabilities, design services, and intellectual property solutions for high-volume manufacturing projects | Semiconductor Manufacturing | 🇰🇷 Yongin-si | 372 |  |
| 39 | [HD Korea Shipbuilding & Offshore Engineering Co., Ltd. (HD KSOE)](https://www.tamtam.ai/c/hd-korea-shipbuilding-and-offshore-engineering-co-ltd-hd-ksoe) (hdksoe.co.kr)<br>A shipbuilding business cluster focused on becoming a technology-oriented company with world-class R&D and engineering capabilities in the marine mobility industry | Shipbuilding | 🇰🇷 Seongnam | 367 |  |
| 40 | [KAON GROUP](https://www.tamtam.ai/c/kaon-group) (kaongroup.com)<br>Development and manufacturing of digital connectivity devices and services for PayTV and Broadband industries, offering integrated end-to-end solutions worldwide. | Telecommunications | 🇰🇷 Seongnam-Si | 366 | 2001 |
| 41 | [SD BIOSENSOR INC](https://www.tamtam.ai/c/sd-biosensor-inc) (sdbiosensor.com)<br>The company is dedicated to enhancing human health through the creation of groundbreaking products, prioritizing sustainable growth and community well-being | Medical Equipment Manufacturing | 🇰🇷 Suwon-Si | 365 | 2010 |
| 42 | [Intellian Technologies](https://www.tamtam.ai/c/intellian-technologies) (intelliantech.com)<br>A global leader in satellite antenna systems, providing connectivity solutions for various industries, focusing on simplicity, innovation, and customer satisfaction | Satellite Telecommunications | 🇰🇷 Seongnam-Si | 348 | 2004 |
| 43 | [HD Hyundai Electric Co., Ltd.](https://www.tamtam.ai/c/hd-hyundai-electric-co-ltd) (hd-hyundaielectric.com)<br>A global provider in heavy electrical machinery, transitioning to digital solutions for the evolving power market with focus on ICT convergence and smart factory initiatives | Appliances, Electrical, and Electronics Manufacturing | 🇰🇷 Seongnam-Si | 342 | 1987 |
| 44 | [LS Mtron](https://www.tamtam.ai/c/ls-mtron) (lsmtron.com)<br>The company operates in machinery and components sectors, producing tractors, injection molding systems, track shoes for battle vehicles, and electronic components | Industrial Machinery Manufacturing | 🇰🇷 Anyang | 338 | 2008 |
| 45 | [MIDAS IT Co., Ltd.](https://www.tamtam.ai/c/midas-it-co-ltd) (midasuser.com)<br>Specializing in civil/structural/mechanical engineering software development and analysis, providing engineering consulting services with a team of experienced developers and engineers | IT Services and IT Consulting | 🇰🇷 Seongnam | 321 | 1989 |
| 46 | [Samjin Co., Ltd](https://www.tamtam.ai/c/samjin-co-ltd) (samjin.com)<br>A global leader in smart control technology for the connected home, offering innovative solutions for controlling entertainment devices and home systems | Consumer Electronics | 🇰🇷 Anyang-si | 321 | 1975 |
| 47 | [Pearl Abyss](https://www.tamtam.ai/c/pearl-abyss) (pearlabyss.com)<br>Global game developer creating extraordinary gameplay experiences with Black Desert MMORPG franchise, serving 40 million users worldwide on PC, mobile, and console | Computer Games | 🇰🇷 Anyang | 314 | 2010 |
| 48 | [Huons Global](https://www.tamtam.ai/c/huons-global) (huonsglobal.com)<br>A leading healthcare group with a focus on pharmaceuticals, medical devices, health functional foods, and ESG sustainability practices for a better future | Pharmaceutical Manufacturing | 🇰🇷 Seongnam | 308 | 1965 |
| 49 | [Wonik IPS](https://www.tamtam.ai/c/wonik-ips) (ips.co.kr)<br>A leading Korean semiconductor equipment company specializing in ALD, CVD, dry etchers, OLED deposition, and 3D NAND Flash systems with global aspirations | Semiconductor Manufacturing | 🇰🇷 Pyeongtaek-Si | 283 | 1981 |
| 50 | [HK inno-n](https://www.tamtam.ai/c/hk-inno-n) (inno-n.com)<br>A leading pharmaceutical firm established in 1984, specializing in prescription drugs, active pharmaceutical ingredients, health supplements, and beauty products Committed to innovation and global growth | Pharmaceutical Manufacturing | 🇰🇷 Seongnam | 213 | 1984 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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- [Publicly traded companies in Gyeonggi](https://www.tamtam.ai/l/publicly-traded-companies-gyeonggi) (26)

## The same list elsewhere in South Korea

- [Companies with in-house R&D in South Korea](https://www.tamtam.ai/l/r-and-d-companies-south-korea) (229)
- [Companies with in-house R&D in Seoul](https://www.tamtam.ai/l/r-and-d-companies-seoul) (88)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Asia](https://www.tamtam.ai/l/r-and-d-companies-in-asia) (4,166)

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Source: https://www.tamtam.ai/l/r-and-d-companies-gyeonggi