The companies in Jena are a mix of established institutions and specialized technology firms. Noteworthy among them are ZEISS Medical Technology, focusing on ophthalmology and dental treatment, and JENOPTIK, an innovative photonics company. The Friedrich Schiller University Jena and Universitätsklinikum Jena represent the city's strong academic and healthcare sectors. Analytik Jena specializes in analytical measurement technology, while dotSource SE develops digital products for marketing and sales.
A significant pattern in these companies is the prevalence of optics, medical technology, and research. Several companies, such as ZEISS Medical Technology, ZEISS Microscopy, and JENOPTIK, operate in the photonics and medical device industries. Additionally, the presence of multiple research institutes and universities highlights Jena's role as a center for scientific and technological development.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
ZEISS Medical Technologyzeiss.com
This company focuses on advancing medical technology with a special focus on ophthalmology, ophthalmic surgery, visualization systems, dental treatment, and gynecology |
4,883 | |||
| 2 |
Friedrich Schiller University Jenauni-jena.de
A historic university in Jena, Germany with a focus on optics, glass manufacture, biotechnology, and a range of technological areas |
2,902 | |||
| 3 |
ZEISS Microscopyzeiss.com
A leading manufacturer of microscopes offering light, electron/ion, optical sectioning, and X-ray microscopes for life sciences, materials research, and industry markets |
2,017 | |||
| 4 |
JENOPTIKjenoptik.com
Innovative photonics company creating solutions for various industries worldwide, emphasizing sustainability, diversity, and exploration of new technologies to make a difference |
1,815 | |||
| 5 |
Universitätsklinikum Jenauniklinikum-jena.de
A leading university hospital in Thuringia with over 200 years of history, providing medical care to patients, education to students, and research opportunities for scientists |
1,369 | |||
| 6 |
Analytik Jenaanalytik-jena.com
Global leader in analytical measurement technology for molecular biology, liquid handling, and automation Provides solutions for various industries with precision, reliability, and comprehensive service |
531 | |||
| 7 |
Ernst-Abbe-Hochschule Jenaeah-jena.de
In Jena, a diverse university offers practice-oriented education in technology, economics, social sciences, and health, promoting interdisciplinary collaboration |
436 | |||
| 8 |
zollsoft GmbHzollsoft.de
An innovative family-owned company offering a rapid-growing Apple-based software for medical practices, with a focus on creativity, growth, and team collaboration |
409 | |||
| 9 |
dotSource SEdotsource.de
dotSource develops scalable digital products for marketing, sales, and services through strategy consulting, technology selection, and agile methodologies Trusted by top companies |
330 | |||
| 10 |
Intershop Communicationsintershop.com
Provides cloud-based e-commerce platform enabling manufacturers and wholesalers to digitalize operations, enhance customer experience, and increase online revenue globally. |
282 | |||
| 11 |
Vistecvistec-semi.com
Specializing in advanced electron-beam lithography technology, the company supplies equipment for semiconductor applications, research, mask making, integrated optics, and emerging markets |
218 | |||
| 12 |
Leibniz Institute on Aging - Fritz Lipmann Institute (FLI)leibniz-fli.de
A research institute in Jena focused on studying genetic and environmental factors influencing aging, aiming to discover therapies for age-related diseases |
182 | |||
| 13 |
Max Planck Institute for Biogeochemistrybgc-jena.mpg.de
This company conducts research on global biogeochemical cycles to understand how living organisms interact with the environment and impact ecosystems and climate |
167 | |||
| 14 |
Jena-Optronik GmbHjena-optronik.de
This company specializes in developing visionary technology for leading-edge space missions, focusing on satellite communication, navigation, Earth observation, and stabilizing spacecrafts |
117 | |||
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. | |||||
| 15 | 80 | ||||
| 16 |
rooom.com - your virtual experience platformrooom.com
A global startup based in Germany offering a platform for creating, managing, and publishing interactive metaverse experiences in 3D, AR, and VR for various industries |
52 | |||
| 17 |
Active Fiber Systems GmbHafs-jena.de
A technological leader in high-power femtosecond laser systems, offering compact to complex solutions based on fiber amplifier technology for scientific and industrial applications |
49 | |||
| 18 |
ORISA Software GmbHorisa.de
It develops innovative configure price quote software for customized solutions in engineering, automobile, and automation industries, focusing on client needs. |
33 | |||
| 19 |
Sonnenklar.TV Reisebüro Jenasonnenklartv-reisebuero.de
A travel agency offering personalized and innovative travel experiences with expert advice, destination knowledge, and excellent service through new media |
31 | |||
| 20 |
Volksbank eG Gera • Jena • Rudolstadtvolksbank-vor-ort.de
The company is a cooperative bank dedicated to its customers and members, focused on helping them achieve their goals |
30 | |||
| 21 |
EQUIcon Software GmbH Jenaequicon.de
A software company founded in 1992, specializing in equipment control solutions for industry and logistics sectors, with a focus on sustainable growth and client collaboration |
26 | |||
| 22 |
Quantum Optics Jena GmbHqo-jena.com
Specializing in quantum technology, the company focuses on advanced photon sources and quantum optical systems for enhanced data security and information processing |
26 | |||
| 23 |
Kontinent Spedition GmbHkontinent-spedition.de
Global transport logistics provider offering professional packaging, storage, and supply management services to clients worldwide |
25 | |||
| 24 |
Navimatix GmbHnavimatix.de
Innovative software development company focusing on IoT, cloud computing, mobile apps, and DevOps for various industries like automotive, healthcare, and more |
25 | |||
| 25 |
TAF mobile GmbHtafmobile.de
A leading software service provider for public transport, specializing in digital ticketing and mobility platforms, serving various transportation companies and promoting sustainable transportation options |
20 | |||
| 26 |
JustOnjuston.com
A company specializing in automating financial processes on the Salesforce platform, offering electronic billing, payment, accounting solutions to support global firms |
18 | |||
| 27 |
wunschlösung GmbHwunschloesung.com
An interdisciplinary team creates tailor-made, scalable web applications for business customers using self-developed code generators to automate application development |
14 | |||
| 28 |
OptoNet e.V.optonet-jena.de
Representing leading Photonics players in Jena, OptoNet creates a platform for communication, cooperation, talent promotion, and marketing to boost international visibility |
8 | |||
| 29 | 6 | ||||
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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.
The same list elsewhere in Germany
- The largest companies in Germany 15,224
- The largest companies in North Rhine-Westphalia 2,983
- The largest companies in Bavaria 2,885
- The largest companies in Baden-Württemberg 2,192
- The largest companies in Hesse 1,378
- The largest companies in Lower Saxony 861
- The largest companies in Rhineland-Palatinate 430
- The largest companies in Schleswig-Holstein 320
- The largest companies in Saxony 297
- The largest companies in Brandenburg 136
- The largest companies in Berlin 1,739
- The largest companies in Munich 1,116
- The largest companies in Hamburg 949
- The largest companies in Frankfurt 540
- The largest companies in Cologne 464
- The largest companies in Düsseldorf 347
- The largest companies in Stuttgart 306
- The largest companies in Bremen 201
- The largest companies in Hanover 155
- The largest companies in Bonn 147
- The largest companies in Nuremberg 137
- The largest companies in Karlsruhe 131
- The largest companies in Essen 126
- The largest companies in Mannheim 122