| APTI | Accelerated Performance Technology International 
| Others |
| APTI | Access Physical Therapy, Inc.
| Others |
| APTI | Advanced Power Technologies Inc.
| Others |
| APTI | Alaska Public Telecommunications, Inc
| Others |
| APTI | Applied Petroleum Technology, Inc.
| Others |
| APTI | Asociatia Pentru Tehnologie Si Internet
| Others |
| APTI | Association For Preservation Technology International
| Others |
| APTI | Association for Psychological Type International
| Others |
| APTI | Association of Pharmaceutical Teachers of India
| Others |
| APTI | Association of Principals of Technical Institutions
| Others |