These Seoul-based companies are predominantly IT services and consulting firms, alongside e-learning providers and a few other sectors. Most of them are mid-sized to large organizations, with several established players in the IT sector. This list includes Samsung SDS, which specializes in cloud platforms and digital logistics, and LG CNS, a DX-specialized company offering digital transformation services. Other notable firms are Engoo, a global e-learning provider, and Yanolja, an innovative travel platform.
A clear pattern among these companies is their strong focus on digital transformation and advanced technology solutions. Many, like CyberLogitec, which provides technology for maritime shipping, and CJ OliveNetworks, which leads digital transformation with AI and big data, leverage AI and data expertise to drive innovation across various industries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Samsung SDSsamsungsds.com
Delivers specialized cloud platforms, digital logistics management, and SaaS solutions to optimize business environments and drive industrial innovation through global IT expertise. |
15,040 | |||
| 2 | 6,299 | ||||
| 3 | 3,216 | ||||
| 4 |
Yanoljayanoljagroup.com
Innovative travel platform offering services in accommodation, leisure, transportation, and restaurants, with a subsidiary providing cloud-based solutions to global hospitality industry |
2,407 | |||
| 5 |
PUBG Corporationkrafton.com
KRAFTON, Inc is a collective of game development studios creating innovative entertainment experiences worldwide, including popular titles like PUBG and TERA |
2,256 | |||
| 6 |
CyberLogiteccyberlogitec.com
Advanced technology solutions for maritime shipping, terminal operations, and logistics, enhancing efficiency, visibility, and collaboration across supply chains. |
961 | |||
| 7 |
Ringleringleplus.com
A platform founded by Stanford MBAs to provide conversational English practice for students worldwide, focusing on cultural barriers and education |
887 | |||
| 8 |
CJ OliveNetworkscjolivenetworks.co.kr
**Summary:** CJ OliveNetworks provides comprehensive IT services, leading CJ Group's digital transformation with expertise in IT systems, AI, big data, and blockchain technologies |
800 | |||
| 9 | 767 | ||||
| 10 |
CJ대한통운cjlogistics.com
A company specializing in expert logistics solutions, providing efficient and reliable services for transporting goods and managing supply chains effectively |
536 | |||
| 11 |
Seegene Inc.seegene.com
A global leader in molecular diagnostics, developing innovative tests and equipment to improve early diagnosis of ailments and quality of life worldwide |
504 | |||
| 12 |
Toss Securitiestoss.im
A service offering a variety of features and products for all types of investors to make planned and stable investments regardless of market conditions |
485 | |||
| 13 |
신세계아이앤씨shinsegae-inc.com
A global retail tech specialist leveraging digital technology for innovation Leading the retail industry in the 4th industrial revolution, enhancing future competitiveness, and transforming daily life |
468 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 14 |
웍스피어(유)jobkorea.co.kr
A leading employment site in South Korea with over 10 million members, offering the most job postings and global recruiting opportunities |
454 | |||
| 15 |
롯데e커머스 (롯데ON)story.lotteon.com
The company is a leading online shopping platform, part of a large retail conglomerate, focusing on creating a convenient and reliable shopping experience for customers |
451 | |||
| 16 |
ESTsoft Corp.estsoft.ai
A leading AI-powered service company utilizing artificial intelligence for innovative R&D outcomes in various sectors, providing practical technology for daily life improvements |
404 | |||
| 17 |
KineMaster - Video Editorkinemaster.com
Mobile video editing suite with templates and assets for businesses, journalists, influencers, entrepreneurs, and creatives to create professional videos easily on-the-go |
394 | |||
| 18 | 375 | ||||
| 19 |
Dong-A Pharmaceutical Co.,Ltddonga.co.kr
Leading South Korean pharmaceutical company specializing in developing, manufacturing, and distributing innovative healthcare products, including medicines, energy drinks, medical equipment, and bio-technology solutions |
354 | |||
| 20 |
LG AI Researchlgresearch.ai
Specializing in AI research, our team explores its impact on industries, economies, and environmental sustainability to unlock its full potential |
341 | |||
| 21 |
DOUZONE BIZONdouzone.com
A leader in industrial information systems, providing innovative digitalization solutions such as ERP, IFRS, groupware, and electronic tax invoices to enhance competitiveness |
316 | |||
| 22 |
Rebellionsrebellions.ai
Specializing in enabling accelerated generative AI at scale through innovative technology solutions |
315 | |||
| 23 | 126 | ||||
| 24 |
소크라에이아이 (Socra AI)socra.ai
A leading AI solutions provider disrupting education, empowering global players with innovative technology for personalized, efficient learning experiences worldwide |
110 | |||
| 25 |
Dabeeo, Inc.dabeeo.com
AI technology company specializing in geospatial data, creating digital twin earth by digitizing spatial data through AI-powered transformation and analysis. |
50 | |||
| 26 |
z-emotionz-emotion.com
z-emotion provides advanced 3D solutions for the fashion industry, offering virtualization, real-time fitting, and digital transformation tools for design and merchandising |
29 | |||
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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.
More company lists in Seoul
- The largest companies in Seoul 418
- Multinational companies in Seoul 150
- Companies with in-house R&D in Seoul 88
- Manufacturers in Seoul 70
- Companies with a mobile app in Seoul 62
- Publicly traded companies in Seoul 61
- Corporate groups and holding companies in Seoul 59
- IT Services and IT Consulting companies in Seoul 57
- Financial services firms in Seoul 49
- Hardware manufacturers in Seoul 42
- Retail chains in Seoul 39
- Critical infrastructure operators in Seoul 36
- Education providers in Seoul 30
- Financial Services companies in Seoul 28
The same list elsewhere in South Korea
The same list elsewhere
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