| 1 Simple Idea | |
| 1COM | Estado de México |
| 30WH | Mexico City |
| Abalon Tecnologia & Sistema | Querétaro |
| Abargon | Mexico City |
| Abastecedora de Conectividad, S.A. | |
| Abastecedora de Conectividad, S.A. de C.V. | Mexico City |
| Abits Software México | Mexico City |
| Abugaber.com | Mexico City |
| Acer Computec México, S.A de C.V. | Mexico City |
| Acerta Computación Aplicada, S.A. de C.V. | |
| Acronet | Mexico City |
| Activacion | Estado de México |
| ActivaMente | Mexico City |
| Actualizaciones Para Computadoras, S.A. de C.V. | Nuevo León |
| Adan Design | Mexico City |
| AdanNetX | Mexico City |
| Adguer | Mexico City |
| Adinteractiv.com | |
| Adix de México, S.A. de C.V. | Mexico City |
| Adsum | Sinaloa |
| Advanced Business Systems S.A. de C.V. | Nuevo León |
| Advantage Security, S. de R.L. de C.V. | Mexico City |
| Adwebsys S.A. de C.V. | |
| Aesoft Corporation, S.A. de C.V. | Nuevo León |
| Agape Networks | Mexico City |
| Agave Lab | |
| Agencia SEO SEM | Mexico City |
| Aguilahosting | Mexico City |
| Aguitel, S.A. de C.V. | Mexico City |
| AiTelecom | Yucatán |
| Akapon Networks | Mexico City |
| Alambre | |
| Alandra Medical | |
| Alaska | Chihuahua |
| Alcatel Mexico, S.A. de C.V. | Estado de México |
| Alestra, S.A. de C.V. | Jalisco |
| Alexandria | Estado de México |
| Alexandria, Consultoría Informática | Mexico City |
| Alfa Diseño de Sistemas, S.A. de C.V. | Mexico City |
| Algebraix | |
| Alianza Corporativo Servicios, S.A. de C.V. | Mexico City |
| Alojate | |
| Alser | Mexico City |
| Alta Multimedia | Mexico City |
| Alternativa Digital, S.A. de C.V. | Mexico City |
| Altoranking | Estado de México |
| Amada López Comunicación y Diseño | Nuevo León |
| América Móvil | |
| América Móvil, S.A. de C.V. | Mexico City |