Here you’ll find 35 Companies that start with O, listed from “O’Reilly Automotive” to “Oxford University Press”. It covers global corporations, regional firms, and notable nonprofit publishers with clear public recognition.
Companies that start with O are business entities whose official names begin with the letter O. Many grew into household names, such as O’Reilly Automotive and Oxford University Press.
Below you’ll find the table with Company, Industry, Founded, Headquarters, and Notes.
Company: The official company name as commonly used, so you can quickly find or verify its listing.
Industry: The primary sector or market the company serves, helping you filter businesses by economic activity.
Founded: The year the company began operations, so you see its age and historical context at a glance.
Headquarters: The country or city where the company is based, helping you assess geographic scope and reach.
Notes: Brief identifiers such as revenue rank, parent company, or public status to give quick, useful context.
Companies that start with O
| Name | Industry | Headquarters | Founded |
|---|---|---|---|
| Oracle | Enterprise Software | United States (Austin) | 1977 |
| Occidental Petroleum | Oil & Gas | United States (Houston) | 1920 |
| O‘Reilly Automotive | Automotive Retail | United States (Springfield) | 1957 |
| Omnicom Group | Advertising | United States (New York) | 1986 |
| Orsted | Renewable Energy | Denmark (Fredericia) | 1972 |
| Otis Worldwide | Industrial Manufacturing | United States (Farmington) | 1853 |
| Okta | Cybersecurity | United States (San Francisco) | 2009 |
| OpenAI | Artificial Intelligence | United States (San Francisco) | 2015 |
| Oatly | Food & Beverage | Sweden (Malmö) | 1994 |
| Oaktree Capital Management | Asset Management | United States (Los Angeles) | 1995 |
| Old Navy | Apparel Retail | United States (San Francisco) | 1994 |
| Overstock.com | E-commerce | United States (Midvale) | 1999 |
| Oakley | Apparel & Accessories | United States (Lake Forest) | 1975 |
| OYO Rooms | Hospitality | India (Gurugram) | 2013 |
| Opera | Web Technology | Norway (Oslo) | 1995 |
| OMV | Oil & Gas | Austria (Vienna) | 1956 |
| Orica | Chemicals | Australia (Melbourne) | 1874 |
| Olympus Corporation | Medical Technology | Japan (Tokyo) | 1919 |
| Organon & Co. | Pharmaceuticals | United States (Jersey City) | 2021 |
| Oscar Health | Health Insurance | United States (New York) | 2012 |
| Oshkosh Corporation | Industrial Manufacturing | United States (Oshkosh) | 1917 |
| Ogilvy | Advertising | United States (New York) | 1948 |
| Ocado Group | E-commerce & Technology | United Kingdom (Hatfield) | 2000 |
| Outokumpu | Metals & Mining | Finland (Helsinki) | 1910 |
| O-I Glass | Packaging | United States (Perrysburg) | 1903 |
| Orange S.A. | Telecommunications | France (Paris) | 1988 |
| Olam International | Agri-business | Singapore | 1989 |
| OnePlus | Consumer Electronics | China (Shenzhen) | 2013 |
| Optus | Telecommunications | Australia (Sydney) | 1981 |
| Oxford University Press | Publishing | United Kingdom (Oxford) | 1586 |
| Orkla ASA | Consumer Goods | Norway (Oslo) | 1654 |
| Origin Energy | Energy | Australia (Sydney) | 2000 |
| Onsemi | Semiconductors | United States (Scottsdale) | 1999 |
| Oerlikon | Industrial Technology | Switzerland (Pfäffikon) | 1906 |
| Old Mutual | Financial Services | South Africa (Cape Town) | 1845 |
Descriptions
Oracle
A global technology giant famous for its database software and cloud engineering systems serving businesses worldwide.
Occidental Petroleum
A major American company engaged in hydrocarbon exploration and petrochemical manufacturing.
O‘Reilly Automotive
A leading U.S. retailer of automotive aftermarket parts, tools, and accessories, with thousands of store locations.
Omnicom Group
One of the world’s largest advertising, marketing, and corporate communications holding companies.
Orsted
A Danish multinational power company that has become a global leader in offshore wind farm development.
Otis Worldwide
The world’s largest manufacturer of vertical transportation systems, primarily elevators and escalators.
Okta
A leading identity and access management company providing cloud software that helps companies manage and secure user authentication.
OpenAI
An influential AI research and deployment company known for creating advanced models like GPT and DALL-E.
Oatly
A Swedish food company that produces plant-based dairy alternatives from oats, famous for its oat milk.
Oaktree Capital Management
A global investment manager specializing in alternative investment strategies, particularly distressed debt.
Old Navy
A popular American clothing and accessories retailer owned by Gap Inc., known for its affordable basics for the whole family.
Overstock.com
An American online retailer that originally sold surplus and returned merchandise, now operating as Bed Bath & Beyond.
Oakley
A famous brand known for its high-performance sunglasses, ski goggles, and other sports gear and lifestyle apparel.
OYO Rooms
A global hospitality chain of leased and franchised hotels, homes, and living spaces.
Opera
A software company known for its family of web browsers for desktop and mobile platforms.
OMV
An Austrian multinational integrated oil, gas, and petrochemical company with operations across Europe.
Orica
One of the world’s largest providers of commercial explosives and blasting systems to the mining and infrastructure markets.
Olympus Corporation
A Japanese company that has evolved from cameras and optics to become a leading manufacturer of medical technology.
Organon & Co.
A global healthcare company formed through a spin-off from Merck, focused on women’s health.
Oscar Health
A technology-focused health insurance company that aims to provide a more user-friendly healthcare experience.
Oshkosh Corporation
An American industrial company that designs and builds specialty trucks, military vehicles, and access equipment.
Ogilvy
A legendary advertising, marketing, and public relations agency founded by David Ogilvy, now part of WPP.
Ocado Group
A British online supermarket that is also a technology company, licensing its fulfillment robotics to other retailers.
Outokumpu
A global leader in stainless steel manufacturing, known for its focus on sustainable production.
O-I Glass
Formerly Owens-Illinois, this company is one of the world’s leading manufacturers of glass container products.
Orange S.A.
A French multinational telecommunications corporation that is one of the largest mobile network operators in the world.
Olam International
A leading food and agri-business company, supplying food ingredients, feed, and fiber to thousands of customers worldwide.
OnePlus
A Chinese smartphone manufacturer known for producing high-spec Android devices that gained a following among tech enthusiasts.
Optus
One of Australia’s largest telecommunications companies, providing mobile, telephone, internet, and satellite services.
Oxford University Press
The largest university press in the world, known for publishing academic journals, dictionaries, and educational books.
Orkla ASA
A leading Norwegian supplier of branded consumer goods to the grocery, retail, and food service sectors in the Nordics and Baltics.
Origin Energy
A major Australian integrated energy company involved in electricity generation, gas exploration, and energy retailing.
Onsemi
A leading semiconductor supplier company offering a portfolio of sensors, power management, and analog components.
Oerlikon
A Swiss technology and engineering group operating in machine and plant engineering.
Old Mutual
A pan-African investment, savings, insurance, and banking group with a long and established history.