| Collegiate Training Initiative | Academic & Science |
| Columbus Technical Institute | Academic & Science |
| Cuito Cuanavale | Airport Code |
| Customer Trade Indicator | Business |
| Carpenter Tools International | Business |
| City Taxi Institute | Business |
| Chartered Translators Ireland | Business |
| Cathay Intl Ld | Business |
| Communication Technologies Inc | Business |
| Chart Industries, Inc. | Business |
| Compucentre Toronto, Incorporated | Business |
| Columbia Tristar Interactive | Business |
| Complete And Total Integration | Business |
| Creative Technology Investments | Business |
| Concrete Technologies Inc | Business |
| Towers Inc | Business |
| Corporate Technologies Inc | Business |
| Certification of Terminal Illness | Business |
| Corporate Tax Incentives | Business |
| Concordia Tractor Inc | Business |
| Career and Technical Instruction | Business |
| Charge Transfer Inefficiency | Chemistry |
| Center for Teacher Innovation | Community |
| Christian Teen Issues | Community |
| Creed Taylor, Inc. | Community |
| Computers Teaching Initiative | Community |
| Caregiver Training Initiative | Community |
| Community Teamwork Inc | Community |
| CTI Television Inc. | Community |
| Corner Travel Index | Community |
| Center of Visual Interest | Computer Technology |
| Computer Techniques Inc | Computing |
| Computer TV Integration | Computing |
| Concrete Technology Incorporated's | Computing |
| Coordenadoria de Tecnologia de Informacao | Computing |
| Computer Technology Integration | Computing |
| Coaxial Transceiver Interface | Computing |
| Colour Transient Improvement | Computing |
| Cisco Telephony Interface | Computing |
| Centre for Teleinformatics | Computing |
| Computer Telephony Institute | Computing |
| Computer Training Institute | Computing |
| Click To Install | Computing |
| Curriculum Technology Integrator | Computing |
| Cyber Threat Intelligence | Computing |
| Compliance Technologies International | Computing |
| ClinTex CTi | Cryptocurrency |
| Cycle Time Improvement | Electronics |
| Current Time Indicator | General |
| Conquer The Island | General |
| Central Tyre Inflation | General |
| Central Terran Intelligence | General |
| Coral Triangle Initiative | General |
| Comparative Tracking Index | General |
| Combined Temperature Integration | General |
| Concept Techniques Institutionnelles | General |
| Capture The Island | General |
| Customer Transaction Intelligence | General |
| Customer Telephone Interface | General |
| Commitment To Intrigue | General |
| Caterham Technology and Innovation | General |
| Charis Training Incorporated | General |
| Central Tire Inflation | General |
| Car Theft Index | General |
| Car Theft Initiative | General |
| Control de Traccion Inteligente | General |
| Cabriolet Tourisme Injection | General |
| Corolla Twincam Indonesia | General |
| Comfort Touring Injection | General |
| Center of Theological Inquiry | General |
| Confederation of Tanzania Industries | General |
| Center on Transition Innovations | General |
| Cleaner Trucks Initiative | General |
| Center for Talent Innovation | General |
| Crew Training International | General |
| Codelet Tuning Infrastructure | General |
| Center Testing International | General |
| Computers in Teaching Initiative | General |
| Cuerpo Tecnico de Investigacion | General |
| Creed Taylor Incorporated | General |
| Cabrio Tourismo Injection | General |
| Common Test Infrastructure | General |
| Confirmed Temperature Initiation | General |
| Carrier Telephone Industries | Governmental |
| Commercial Theater Institute | Governmental |
| Coaches Training Institute | Governmental |
| Commerce Training Institute | Governmental |
| Chemical Transportation Inc | Governmental |
| Computer Telephony Integration | Information Technology |
| Combined Truck Insurance | Insurance |
| CITIC Trust International | International |
| Confederación Independiente de Trabajadores | International |
| Control Towers International | International |
| Chesapeake Technology International | International |
| Cardiac Troponin I | Medical |
| Centers for Therapeutic Innovation | Medical |
| Cryptologic Technician Interpretive | Military and Defence |
| Computer Telephony Interface | Softwares |
| Cosin Tire Interface | Softwares |
| Critical Transportation Item | Space Science |
| Credit Technology Inc | Technology |
| Concrete Technology Inc | Technology |
| Climate Technology Initiative | Technology |
| Control Technology Inc | Technology |
| Computer Technology Institute | Technology |
| Commercium Technology Inc | Technology |
| Compatible Technology International | Technology |
| Cooling Technology Institute | Technology |
| Combined Technology Iron | Technology |
| Computer Telephone Integration | Telecommunication |
