| Name
| Country
| Market Cap (US$)
|
|---|
| Alion Science and Technology Corporation | United States | Private |
| ALK Technologies, Inc. | United States | Private |
| Allaire Corporation | United States | Private |
| ALLDATA LLC. | United States | Private |
| Allegient Systems, Inc. | United States | Private |
| Allegro Development Corporation | United States | Private |
| Allen Communication Learning Services | United States | Private |
| Allen Systems Group, Inc. | United States | Private |
| Alliance Automation Systems, Inc. | United States | Private |
| Allianse Asa | Norway | Private |
| Alloptic, Inc. | United States | Private |
| Alloy Software, Inc. | United States | Private |
| Allserve Systems Plc | United Kingdom | Private |
| ALLTEL Information Services Inc. | United States | Private |
| Alogent Corporation | United States | Private |
| Aloha NY Systems, Inc. | United States | Private |
| Alpha Microsystems, Inc. | United States | Private |
| Alphamosaic Limited | United Kingdom | Private |
| AlphaNet Solutions, Inc. | United States | Private |
| AlphaShield, Inc. | Canada | Private |
|