| International Student and Scholar Institute | Academic & Science |
| Integrated Science | Academic & Science |
| International Society for Scientometrics and Infometrics | Academic & Science |
| Integrated Silicon Solutions, Inc. | Business |
| Integrated Sales Solutions Inc | Business |
| Information Systems Staffing, Inc. | Business |
| Integrated Silicon Solution Inc | Business |
| Integrated Spatial Solutions Inc | Business |
| Imaging Solutions and Services Inc | Business |
| International Steel Services Inc | Business |
| Industrial Stainless Supply Inc | Business |
| Integrated Science Solutions Inc | Business |
| Industrial Supply Solutions Inc | Business |
| Innovative Scientific Solutions Inc | Business |
| Integrated systems Solutions Inc | Business |
| Imaging Solutions Services Inc | Business |
| Integrated Support Solutions Inc | Business |
| Insurance Solutions Services Inc | Business |
| Integrated Silicon Solution In | General |
| Integrated Spatial | General |
| Integrated Silicon Solution | General |
| Innovation System for System Innovation | General |
| Innovative Scientific Solutions Incorporated | General |
| Integrated Systems Solutions Incorporated | General |
| Individual Short Subscriber Identity | General |
| Interview Schedule of Social Integration | General |
| Integrated Services Supporting Independance | General |
| Integrated Services Supporting Independence | General |
| Ikatan Sepeda Seluruh Indonesia | General |
| Indonesia Sharia Stock Index | General |
| Intensive Spanish Summer Institute | Governmental |
| Institute for the Study of Societal Issues | Governmental |
| Institute of Strategic Studies Islamabad | Governmental |
| International Science Summer Institute | Governmental |
| Intermountain Suzuki String Institute | Governmental |
| International Summer Science Institute | Governmental |
| International Studies Summer Institute | Governmental |
| In Space Soldering Investigation | Governmental |
| International Space Science Institute | Governmental |
| International Society for Self and Identity | International |
| International Society for Scientometrics and Informetrics | International |
| International Software Systems Inc | Softwares |
| Integrated Software Solutions Inc | Softwares |
| Innovative Software Solutions Inc | Softwares |
| Ibm Standard Software Installer | Softwares |
| Inter-switching System Interface | Telecommunication |
