| Name
| Country
| Market Cap (US$)
|
|---|
| ALPNET, Inc. | United States | Private |
| ALTA A/S | Denmark | Private |
| Altair Engineering, Inc. | United States | Private |
| Altiris, Inc. | United States | Private |
| Altnet Inc | United States | Private |
| Altum, Inc. | United States | Private |
| Altus Learning Systems, Inc. | United States | Private |
| Alumni Computer Group, Inc. | United States | Private |
| Amalgamated Software of North America, Inc. | United States | Private |
| Amaze Entertainment Incorporated | United States | Private |
| Amazing Global Technologies Ltd | United Kingdom | Private |
| AmazonTech, Inc. | United States | Private |
| AmberPoint, Inc. | United States | Private |
| Ambion, Inc. | United States | Private |
| AMC Technology, LLC | United States | Private |
| Amcom Software, Inc. | United States | Private |
| Amdahl (UK) Ltd. | United Kingdom | Private |
| America's Choice Healthplans, Inc. | United States | Private |
| American Computer & Telephone, Inc. | United States | Private |
| American Innovations Limited | United States | Private |
|