Company profiles and links to respective websites are alphabetically listed.
* Companies including "NTT" as part of their name are listed with "NTT" omitted.
- OAK LAWN MARKETING, INC.
- Oak Lawn Marketing International ,Inc.
- Oakton AA Services Pty Ltd
- Oakton Contracting & Recruitment Pty Ltd
- Oakton Global Technology Services Centre (India) Private Limited
- Oakton Limited
- Oakton Services Pty Ltd
- Omni-Link (Pty) Ltd
- Ontario 1491132 Limited
- Optimal Solutions Integration Australia Pty Ltd
- Optimal Solutions Integration (Software) Bd. Pvt. Ltd.
- Orson Conferencing SNC
- Otemachi First Square Inc.