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.
- Objective Risk Management Pty Limited
- Omni-Link (Pty) Ltd
- On Command Australia Pty. Ltd.
- OpSource Inc.
- OpSource India Pvt Ltd
- Opsource Technologies Europe Ltd
- OpSource UK Ltd
- Otemachi First Square Inc.