| AK & C General Merchandise |
| Alabang Commercial Corporation |
| Alabang Country Club |
| Alaska Aces |
| Alaska Milk Corporation |
| Alay sa Diyos Community - Class 3 - Cebu |
| Alberto Shoes - Cebu |
| Alexander's Wear International Corp |
| All Asian Countertrade - Pampanga |
| All Lines Marketing - Cebu |
| Allegro Beverage Corp. |
| Allied Telesis |
| Alpha Machinery & Engineering |
| ALS Insurance Services |
| Alson Development & Investment Corp (Davao) |
| Alsons Inc |
| Alsons Insurance Corp |
| Alstom Philippines Inc |
| Altus Corporation - Baguio |
| AMA Transport Services Inc |
| Amayana Management & Devt. Corp. |
| American Brake Parts & Industrial Sales |
| AMG House, Inc. |
| Amkor Technologies Philippines, Inc. |
| Ammirati Puris Lintas |
| Amparito L. Lhuillier Educational Foundation |
| AMS Group of Companies - Davao |
| Amway Philippines |
| Anchor Bank |
| Andres Soriano Foundation |
| Anflo Group of Companies - Davao |
| Angeles Electric Corp - Pampanga |
| ANQ Builders - Cebu |
| Ansi Information System, Inc. |
| Antex Enterprise - Cebu |
| Anthony's Wines & Spirits Corp |
| ANZ Bank |
| Aon Hongkong |
| Aon Philippines, Inc. (formerlyAyala Aon Risk Services) |
| AP Madrigal Steamship |
| APO Alumni Association Singapore |
| Apparel Tech- Pampanga |
| APTSC (Aboitiz) Cebu |
| Araneta Center Inc. |
| Araullo University |
| Ardexor Inc - Davao |
| Arellano University |
| Argosy Advisers Inc |
| Armed Forces and Police Mutual Benefits Association, Inc. (AFPMBAI) |
| Armed Forces and Police Retirement and Separations Benefits Systems (AFP RSBS) |
