| Philadelphia Folksong Society | Academic & Science |
| Philadelphia Film Society | Academic & Science |
| Personal Financial Specialist | Accounts and Finance |
| Personal Finance Society | Accounts and Finance |
| Parent Financial Statement | Business |
| Personal Financial Statement | Business |
| Personal Financial Services | Business |
| Primerica Financial Services | Business |
| Pre-Foreclosure Sale | Business |
| Provident Financial Services | Business |
| Partners For Financial Stability | Business |
| Professional Financial Services | Business |
| Parents Financial Statement | Business |
| Princeton Financial Systems | Business |
| Pacific Fund Systems | Business |
| Personal Financial Specialists | Business |
| Psyched For Success | Business |
| Personalized Floral Service | Business |
| Professional Filing System | Business |
| Primary Flying School | Community |
| Penang Free School | Community |
| Partial File Sharing | Computing |
| Pluggable File System | Computing |
| Personal File System | Computing |
| Persistent File System | Computing |
| Pegasus File System | Computing |
| Plays For Sure | Computing |
| Physical File System | Computing |
| Perfect Forward Secrecy | Computing |
| Portable File System | Computing |
| Professional File System | Computing |
| Pool File System | Computing |
| Page Free Space | Computing |
| Database (pfs:file) - Text File (pfs:write) | File Type |
| Prime Focus Spectrograph | General |
| Particle Filter System | General |
| Power Front Seats | General |
| Plate Force Sensor | General |
| Polska Fabryka Samochodow | General |
| Purge Flow Sensor | General |
| Peugeot Financial Services | General |
| Power Fail Simulator | General |
| Porsche Financial Services | General |
| Permanent Formwork Systems | General |
| Perfect Forwarding Secrecy | General |
| Prince Fahd Salman | General |
| The Planetary Fourier Spectrometer | General |
| Pre-Feasibility Study | General |
| Pelvic Floor Stimulator | General |
| Precision Farming Specialist | General |
| Petrochem Field Services | General |
| Paul Frank Sam | General |
| Priority For Service | General |
| Plugin Finder Service | General |
| Pay for Success | General |
| Perfect Forward Security | General |
| Planet Finder Spectrograph | General |
| Physiological Filtration of Seaweed | General |
| Peritoneo Fascial Suture | General |
| Professional Flooring Supply | General |
| Precision Freehand Sculpting | General |
| Pillow Fight Simulator | General |
| Power Feeding System | General |
| Planetary Fourier Spectrometer | General |
| Pivotal Function Service | General |
| Protospacer Flanking Site | General |
| Perfect Focus System | General |
| Partners in Food Solutions | General |
| Perturbative Factoring Sieve | General |
| Progressive Fighting Systems | General |
| Polymeric Ferric Sulfate | General |
| Personal File Space | General |
| Piper Fatigue Scale | Governmental |
| Parents' Fair Share | Governmental |
| Patella Femoral Syndrome | Medical |
| Physician Fee Schedule | Medical |
| Physicians Filing Service | Medical |
| Progression Free Survival | Medical |
| Protocol Functions Similar | Networking |
| Parallel File System | Networking |
| PTC India Financial Services Limited | NSE Company Symbol |
| Percent Full Scale | Space Science |
| Primary Flight System | Space Science |