| Name | Country | Market Cap (US$) |
|---|
| Point to Point Business Development, Inc. | United States | Private |
| PointServe, Inc. | United States | Private |
| Polivec, Inc. | United States | Private |
| PolyServe, Inc. | United States | Private |
| Polytechs Software Development Group, Inc. | United States | Private |
| Popkin Software & Systems Inc. | United States | Private |
| Postel Spa | Italy | Private |
| Postilion International Ltd. | United Kingdom | Private |
| Postini, Inc. | United States | Private |
| Power On Software, Inc. | United States | Private |
| Powered, Inc. | United States | Private |
| PowerSteering Software, Inc. | United States | Private |
| Powerway, Inc. | United States | Private |
| PPM 2000, Inc. | Canada | Private |
| Pr.Es. Srl | Italy | Private |
| PracticeOne Company | United States | Private |
| PracticeWorks, Inc. | United States | Private |
| Pragmatech Software, Inc. | United States | Private |
| PRE Solutions, Inc. | United States | Private |
| Precise Software Solutions | United States | Private |
| Predicate Logic, Inc. | United States | Private |
| Premis Corporation | United States | Private |
| PreVisor | United States | Private |
| Primavera Systems, Inc. | United States | Private |
| Prime Response, Inc. | United States | Private |
| PrimeLearning Group Limited | Republic of Ireland | Private |
| Primeon, Inc. | United States | Private |
| Primus Knowledge Solutions, Inc. | United States | Private |
| Princeton Softech, Inc. | United States | Private |
| Privia, Inc. | United States | Private |
| PrO Unlimited | United States | Private |
| ProAct Technologies Corporation | United States | Private |
| ProactiveNet, Inc. | United States | Private |
| ProActivity, Inc. | United States | Private |
| Proalpha Software Ag | Germany | Private |
| ProClarity Corporation | United States | Private |
| Procuri, Inc. | United States | Private |
| Prodika, Inc. | United Kingdom | Private |
| Product Development Institute Inc | Canada | Private |
| Profdoc ASA | Norway | Private |
| Professional Staff Leasing Corporation | United States | Private |
| Proficiency, Limited | United States | Private |
| Proficient Systems, Inc. | United States | Private |
| Profilium Inc. | Canada | Private |
| ProfitLine, Inc. | United States | Private |
| ProfitLogic, Inc. | United States | Private |
| Proforma Corporation | United States | Private |
| Progeny Linux Systems, Inc. | United States | Private |
| Project InVision International | United States | Private |
| Prolexys Pharmaceuticals, Inc. | United States | Private |
| Prolific, Inc. | United States | Private |
| Pronto Networks, Inc. | United States | Private |
| Proofpoint, Inc. | United States | Private |
| Propel Software Corporation | United States | Private |
| Propellerhead Software | Sweden | Private |
| ProSight, Inc. | United States | Private |
| ProSoft Technology Group, Inc. | United States | Private |
| Prospero Technologies LLC | United States | Private |
| Protechnic Exeter | United Kingdom | Private |
| Protegrity Corporation | United States | Private |
| Protexis, Inc. | Canada | Private |
| Protocom Development Systems | Australia | Private |
| Provia Software, Inc. | United States | Private |
| Proxyconn, Inc | United States | Private |
| Prymak LLC | United States | Private |
| PS Financials plc | United Kingdom | Private |
| PSS Systems, Inc. | United States | Private |
| Psychsoft | United States | Private |
| Psygnosis Ltd | United Kingdom | Private |
| PTC Software Ltd. | United Kingdom | Private |
| Pulse Entertainment, Inc. | United States | Private |
| Pulsic Limited | United Kingdom | Private |
| PurchasingNet, Inc. | United States | Private |
| Pure Atria Corporation | United States | Private |
| PureEdge Solutions, Inc. | Canada | Private |
| Purkinje, Inc. | Canada | Private |
| Pyramid Digital Solutions LLC | United States | Private |
| Q-Data Ltd. | South Africa | Private |
| Q-Matic Corporation | United States | Private |
| Q1 Labs, Inc. | Canada | Private |
| Qantas Information Technology Ltd. | Australia | Private |
| Qarbon, Inc. | United States | Private |
| QAS Limited | United Kingdom | Private |
| QNX Software Systems Limited | Canada | Private |
| Qovia, Inc. | United States | Private |
| Qpass Inc. | United States | Private |
| Quadritek Systems, Inc. | United States | Private |
| Quadstone | United Kingdom | Private |
| Quality Care Solutions, Inc. | United States | Private |
| Quallaby Corporation | United States | Private |
| Qualys, Inc. | United States | Private |
| Quantum Compliance Systems, Inc. | United States | Private |
| Quarem | United States | Private |
| Quark, Inc. | United States | Private |
| Question Mark Corporation | United States | Private |
| Questra Corporation | United States | Private |
| QuickArrow, Inc. | United States | Private |
| Quintus Corporation | United States | Private |
| Quova, Inc. | United States | Private |
| R Systems, Inc. | United States | Private |
|
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