These Helsinki-based companies with in-house R&D are primarily large organizations, many with a global presence, reflecting a strong industrial and manufacturing base. Wärtsilä, for example, develops technology for sustainable societies, while UPM is a global provider of renewable fibers and materials. The University of Helsinki is a leading multidisciplinary research institution, and HUS Helsingin yliopistollinen sairaala is a major healthcare provider. Stora Enso offers renewable products in packaging and biomaterials.
A notable pattern among these companies is their focus on sustainability and environmental performance across various sectors. This includes Outokumpu, which specializes in sustainable stainless steel production, and Metso Outotec, providing sustainable technologies for aggregates and minerals processing. Kalmar offers sustainable cargo handling solutions, and Kemira provides safe and sustainable chemistries for water-intensive industries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Wärtsiläwartsila.com
This company empowers sustainable societies by providing innovative technology and services for improved environmental and economic performance globally |
18,000 | |||
| 2 | 18,000 | ||||
| 3 |
University of Helsinkihelsinki.fi
Leading multidisciplinary research university fostering international collaboration, education, and innovation for sustainable solutions and global impact. |
11,563 | |||
| 4 |
HUS Helsingin yliopistollinen sairaalahus.fi
A leading healthcare provider in Finland with over 27,000 professionals, specializing in rare and complex diseases, treating 680,000 patients annually |
6,975 | |||
| 5 |
Stora Ensostoraenso.com
A global provider of renewable products in packaging, biomaterials, construction, and paper, promoting sustainability with low-carbon, fiber-based solutions for eco-friendly businesses |
6,276 | |||
| 6 |
Outokumpuoutokumpu.com
Global leader in sustainable stainless steel production, turning recycled steel into long-lasting material used in various applications while actively working towards reducing carbon footprint |
3,724 | |||
| 7 |
Kalmarkalmarglobal.com
Global leader in sustainable cargo handling solutions for ports, terminals, and heavy industry, providing innovative, eco-efficient operations with an extensive electric portfolio |
3,583 | |||
| 8 |
Metso Outotecmetso.com
Provides sustainable technologies, solutions, and services for aggregates, minerals processing, and metals refining industries, improving efficiency and reducing environmental risks globally. |
3,577 | |||
| 9 |
Kemirakemira.com
Leading provider of safe and sustainable chemistries for water-intensive industries, striving to create a more sustainable future through collaboration and innovation |
3,312 | |||
| 10 |
PKC Grouppkcgroup.com
A multinational enterprise within the automotive industry, offering diverse products and services with a global presence and a focus on diversity and inclusion |
3,268 | |||
| 11 |
Supercellsupercell.com
Global game company based in Helsinki, Finland, with offices in various locations Known for popular games like Clash of Clans and Clash Royale Promotes ownership and independence |
2,733 | |||
| 12 |
Uponoruponor.com
A global provider of water movement solutions for residential, commercial, and municipal customers, offering safe drinking water, energy-efficient heating and cooling systems, and reliable infrastructure solutions |
1,907 | |||
| 13 |
Patriapatriagroup.com
Provides aerospace and military equipment, armored vehicles, mortar systems, and pilot training while offering lifecycle support, maintenance, and intelligence surveillance for critical operations. |
1,641 | |||
| 14 |
Hiabhiabgroup.com
Leading provider of smart, safe, and sustainable load handling solutions including loader cranes, forklifts, forestry cranes, skiploaders, roll-off cable hoists, and tail lifts |
1,590 | |||
| 15 | 1,576 | ||||
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. | |||||
| 16 | 1,477 | ||||
| 17 |
Granlundgranlund.fi
A Finnish company in the real estate and construction sectors with over 1400 professionals, offering services in MEP design, property management, energy consulting, and more |
1,329 | |||
| 18 |
Wärtsilä Marinewartsila.com
A global leader providing engines, propulsion systems, hybrid technology, and powertrain solutions for decarbonizing the maritime industry with performance-based agreements and expertise |
1,297 | |||
| 19 |
Haaga-Helia University of Applied Scienceshaaga-helia.fi
The company prepares professionals for business and services through education, research, and development in various fields including business, IT, and tourism |
1,175 | |||
| 20 |
Wärtsilä Energywartsila.com
The company specializes in helping customers transition to renewable energy by optimizing energy systems, providing flexible power plants, storage solutions, and lifecycle services |
1,124 | |||
| 21 |
Teknosteknos.com
A global coatings company offering a wide range of paints for manufacturing, building, and consumers, with a focus on quality and innovation to protect and prolong |
1,002 | |||
| 22 |
UPM Raflatacupmraflatac.com
High-performance self-adhesive products including label materials, graphics solutions, specialty tapes, and customer-focused reliable services worldwide. |
984 | |||
| 23 |
Halton Grouphalton.com
Development and provision of indoor air quality solutions for commercial, healthcare, kitchen, energy, and marine environments ensuring safety and efficiency. |
883 | |||
| 24 | 760 | ||||
| 25 |
Qvantelqvantel.com
Qvantel develops cloud-native Digital BSS for communication service providers, using no/low code technology to enable quick transformation to digital-first companies |
716 | |||
| 26 |
Folkhälsanfolkhalsan.fi
An organization focused on social and health care, research, welfare services, and education to promote health and quality of life in Finland |
675 | |||
| 27 |
Ahlstrom-Munksjöahlstrom.com
Completed ownership arrangement of Decor business, resulting in a stand-alone company named Munksjö, separate from the original entity. |
658 | |||
| 28 |
WithSecurewithsecure.com
Provides outcome-based cybersecurity solutions, protecting mid-market companies with AI-powered technologies, human expertise, and co-security services, focusing on privacy and compliance. |
629 | |||
| 29 | 620 | ||||
| 30 |
Finnish Meteorological Institute - Ilmatieteen laitosilmatieteenlaitos.fi
The company observes and researches the atmosphere, near space, and seas to provide services for public safety, business, and citizens |
614 | |||
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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 11, 2026.
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