| Park Student Success Center (Park University) | Academic & Science |
| Public Service Satellite Consortium (University of Maryland) | Academic & Science |
| Psychology Student Study Center | Academic & Science |
| Psychology Student Success Center | Academic & Science |
| Pastel Society of Southern California | Academic & Science |
| Petroleum Systems Services Corporation | Business |
| Publishers Storage and Shipping Corp | Business |
| Psychiatric Services, SC | Business |
| Pacific Senior Secondary Certificate | Business |
| Passenger Ship Safety Certificate | Business |
| Progress In Solid State Chemistry | Chemistry |
| Pennsylvania State Singing Convention | Community |
| Parent School Support Committee | Community |
| Pennsylvania School Study Council | Community |
| Pacific Structural Steel Conference | Community |
| Partners for Student Success Conference | Community |
| Parent School Service Commitment | Community |
| Professional Services Selection Committee | Community |
| Parallel Sysplex System Center | Computing |
| Pastel Society Southern California | General |
| Puget Sound Skills Center | General |
| Protein Structure Similarity Clustering | General |
| Personeel Shared Service Centre | General |
| Physica Status Solidi C | General |
| Phone Screen Sequential Capture | General |
| Porsche Super Sports Cup | General |
| Post-Settlement Subframe Condition (BMW) | Governmental |
| Philippine Social Science Council | Governmental |
| Punjab State Sports Council | Governmental |
| Pharmacy Services Support Center | Medical |
| Physical Science Study Committee | Physics Related |
| Pacific States Steel Corporation | Regional |
| Philatelic Specialists Society of Canada | Regional |
| Products and Solutions Support Center (ibm) | Softwares |
| Php Sysadmin Script Collection | Softwares |
| Pico-satellite Solar Cell Experiment | Space Science |
| Philadelphia Sport and Social Club | Sports |
| Penn State Snowboard Club | Sports |
| Puget Sound Swim Club | Sports |
| Pittsburgh Speed Skating Club | Sports |
| Puget Sound Sailing Championship | Sports |
