| Organization | Department & Ministry | Institution Type | State |
|---|---|---|---|
| Atic Industries Ltd. | — | — | Tamil Nadu |
| Atishay Ltd. | — | — | Maharashtra |
| Atlas COPCO India Ltd. | — | — | Maharashtra |
| Atlas Cycles (Haryana) Ltd. | — | — | Haryana |
| Atlas Life Sciences Pvt. Ltd. | — | — | Gujarat |
| ATLAS Skilltech University | — | Centres of Higher Learning | Maharashtra |
| Atmiya University | — | Centres of Higher Learning | Gujarat |
| Atomic Energy Education Society (AEES) | Ministry of Science & Technology (MoST) | Research Institutions | Maharashtra |
| Atomic Minerals Directorate (AMD) for Exploration and Research | Ministry of Science & Technology (MoST) | Research Institutions | Telangana |
| Atomic Minerals Exploration and Research Directorate (AMD) | Ministry of Science & Technology (MoST) | — | Telangana |
| Atom Technologies Ltd. | — | — | Maharashtra |
| A Tosh & Sons (India) Ltd. | — | — | West Bengal |
| Atotech India Ltd. | — | — | Haryana |
| Atra Pharmaceuticals Ltd. | — | — | Maharashtra |
| Atria University | — | Centres of Higher Learning | Karnataka |
| ATS Elgi Ltd | — | — | Tamil Nadu |
| Attero Recycling Pvt. Ltd. | — | — | Uttar Pradesh |
| Atul Auto Ltd. | — | — | Gujarat |
| Atul Ltd. | — | — | Gujarat |
| Auchtel Products Ltd. | — | — | Maharashtra |
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