| # | Company | Employees |
|---|---|---|
| 1 |
Carl von Ossietzky University of Oldenburguol.de
A young university in Germany, focusing on interdisciplinary research to address societal challenges Collaborates globally and prepares students for various professions |
2,027 |
| 2 |
CEWE Groupcewe-group.com
Leading European photo printing company with innovative online services, producing billions of photos, photobooks, and gifts across multiple brands. |
1,963 |
| 3 |
EWE TEL GmbHewe.com
The company is a regional telecommunications provider in Germany offering internet, mobile, fixed-line, TV, and business solutions to customers |
1,372 |
| 4 |
BTC - Business Technology Consulting AGbtc-ag.com
Support energy, industry, municipalities with digital transformation, innovative IT solutions, automated processes, and sustainable business models through expert collaboration. |
1,019 |
| 5 |
Oldenburgische Landesbank AGolb.de
A modern financial group in North Germany providing comprehensive services to corporate, private, and wealth management clients regionally and nationwide |
772 |
| 6 |
EWE NETZewe-netz.de
Regional energy and telecommunications network operator enabling the energy transition with nearly 100% renewable energy, focusing on innovative solutions for cost-effective transition |
651 |
| 7 |
Klinikum Oldenburg AöRklinikum-oldenburg.de
The Klinikum Oldenburg is a leading medical center in the Weser-Ems region, providing healthcare, research, and treatment for patients with a focus on medical progress and patient care |
565 |
| 8 | 514 | |
| 9 |
Landessparkasse zu Oldenburglzo.com
The company is a customer-centered bank with 109 local branches, serving both private and corporate clients with a strong focus on employee development |
488 |
| 10 |
Nanu-Nanaunternehmen.nanu-nana.de
Retailer offering a wide range of trendy and classic home decor items including candles, picture frames, vases, and lanterns across Europe. |
398 |
| 11 |
Stadt Oldenburgoldenburg.de
This company works for the city of Oldenburg, focusing on providing essential services, maintaining public spaces, promoting culture and sports, and shaping the future |
386 |
| 12 |
Landwirtschaftskammer Niedersachsenlwk-niedersachsen.de
The largest advisory and educational organization for agricultural businesses, providing support in areas such as work organization, plant and animal production, and economics |
376 |
| 13 |
Pius-Hospital Oldenburgpius-hospital.de
Operating with 13 clinics and 1,500 employees, the largest Catholic hospital in Northwest Germany provides specialized medical care to 61,500 patients annually |
215 |
| 14 |
Kommunale Datenverarbeitung Oldenburg (KDO)kdo.de
As an innovation and technology service provider for public administrations, they offer IT solutions, e-government solutions, and services to support municipal processes nationwide |
209 |
| 15 |
bussbuss-wohnen.de
Leading furniture company in the North West, with two locations offering over 45,000m² of living inspiration from renowned brands and designers Over 360 employees provide personalized service |
204 |
| 16 |
Treuhandtreuhand.de
A medium-sized consulting firm providing top-notch services in auditing, tax, legal, business, and IT consulting Committed to client success and employee growth |
160 |
| 17 |
Unternehmensgruppe LUDWIG FREYTAGkarrierefreytag.de
Family-owned construction company with over 130 years of experience, prioritizing trust, responsibility, and appreciation for employees Emphasizes work-life balance and employee empowerment |
158 |
| 18 |
Oberlandesgericht Oldenburgolg-oldenburg.de
The company provides insights into everyday legal life, showcases various legal professions, and offers career opportunities in civil and criminal law |
155 |
| 19 |
EWE Go GmbHewe-go.de
EWE Go offers innovative mobility solutions, tailored to organizations' needs, to streamline operations and enhance success through simple, user-friendly products and services |
151 |
| 20 |
Glasfaser NordWest GmbH & Co. KGglasfaser-nordwest.de
A joint venture expanding fiber-optic network in northwest Germany, providing high-speed internet up to 1,000 Mbit/s to 15 million households and businesses |
151 |
| 21 |
Öffentliche Oldenburgoeffentlicheoldenburg.de
A public insurance company with strong ties to the region, offering insurance services in the Oldenburg area with a wide service network |
149 |
| 22 |
FAMO GmbH & Co. KGfamo24.de
A successful wholesale company specializing in electrical installation, home and lighting technology, and heating and plumbing Providing excellent service with a focus on employee satisfaction |
147 |
| 23 | 112 | |
| 24 |
BTC Embedded Systemsbtc-embedded.com
A technology company specializing in verification and test methods for model-based software development in the automotive industry, with global partnerships and locations |
104 |
| 25 |
BÜFA Cleaning GmbH & Co. KGbuefa-cleaning.com
Global provider of industrial cleaning products and services for various industries, offering special cleaners, hygiene products, care solutions, and dosing technology solutions |
77 |
| 26 |
Oldenburger Volksbankoldenburger-volksbank.de
This cooperative bank prioritizes customer and member needs, guided by values such as fairness, transparency, and responsibility, serving the Oldenburg region |
76 |
| 27 |
ise Individuelle Software und Elektronik GmbHise.de
A leading European supplier of building automation technology, the company has been developing cutting-edge software and hardware since 1996 |
64 |
| 28 |
HERZOG GmbH Braiding machinesherzog-online.com
A leading developer and manufacturer of braiding and winding machinery, recognized globally for their innovation, tradition, technical expertise, and quality leadership |
50 |
| 29 |
Paul Hewittpaul-hewitt.com
The company specializes in creating innovative, minimalist accessories with a maritime flair, embodying timeless values through unique and diverse collections |
30 |
| 30 |
Brille24 GmbHbrille24.de
A dynamic company in Oldenburg, offering a wide range of fashionable eyewear products, including prescription glasses, sunglasses, and contact lenses |
26 |
| 31 |
RETERNITYreternity.de
A German streetwear label founded in 2018, creating high-end, timeless products inspired by love for detail and freedom, all produced in Europe |
24 |
| 32 |
HIIVE Hotels Group GmbHhiive.de
HIIVE Experience Hotels offer a cosmopolitan and authentic stay, whether in urban neighborhoods or surrounded by nature |
24 |
| 33 |
Trend Hair GmbHtrend-hair.net
A family-run hairdressing company offering stylish haircuts, colors, and styles while emphasizing competence, innovation, and passion They also provide training and wholesale services |
19 |
| 34 |
ready & go GmbHreadyundgo.de
The company offers customized shipping solutions tailored to businesses, specializing in logistics and freight forwarding to optimize supply chain processes |
8 |
| 35 |
Boom Software GmbHboomsoftware.com
Boom Software focuses on long-term partnerships with employees, customers, and partners to create innovative product development while minimizing waste and resource usage |
7 |
| 36 |
Humatects - The Human-Machine Architectshumatects.com
An IT company in Northern Germany specializing in interactive systems using Human-Machine Interaction, AR/VR, AI, and Cloud Computing for various industries |
7 |
| 37 |
Stadtmuseum Oldenburgstadtmuseum-oldenburg.de
A historical museum in Oldenburg founded by a local art collector in 1910, celebrating its 100th anniversary in 2014 |
5 |
| 38 |
INSTARIDEinstaride.de
Innovative ride hailing service connecting customers for 'I'm driving there anyway' trips with funding from EFRE and Lower-Saxony |
2 |
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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 Oct 24, 2026.
The same list elsewhere in Germany
- The largest companies in Germany 13,481
- The largest companies in North Rhine-Westphalia 2,663
- The largest companies in Bavaria 2,566
- The largest companies in Baden-Württemberg 1,960
- The largest companies in Hesse 1,227
- The largest companies in Lower Saxony 785
- The largest companies in Rhineland-Palatinate 389
- The largest companies in Schleswig-Holstein 286
- The largest companies in Saxony 263
- The largest companies in Brandenburg 119
- The largest companies in Berlin 1,475
- The largest companies in Munich 957
- The largest companies in Hamburg 824
- The largest companies in Frankfurt 475
- The largest companies in Cologne 417
- The largest companies in Düsseldorf 307
- The largest companies in Stuttgart 266
- The largest companies in Bremen 177
- The largest companies in Hanover 139
- The largest companies in Bonn 135
- The largest companies in Nuremberg 132
- The largest companies in Karlsruhe 119
- The largest companies in Essen 112
- The largest companies in Mannheim 106