| Custom Lab Software Systems, Inc. | Connecticut |
| Custom Machining Corporation | |
| Custom Microwave Components, Inc. | California |
| Custom Navigation Systems, Inc. | Connecticut |
| Custom Networks, Inc. | Georgia |
| Custom Sensors, Inc. | New York |
| Custom Software and Support | Ohio |
| Custom Software by Preston | Illinois |
| Custom Software Experts, Inc. | Florida |
| Custom Software Lab | Oklahoma |
| Custom Solutions | Illinois |
| Custom Solutions, Inc. | Florida |
| Custom Support | Vermont |
| Custom Suppression, Inc. | Arizona |
| Custom Systems Integration | Arizona |
| Custom Technologies, Inc. | Georgia |
| Custom toll free | California |
| Custom Virtual Solutions | |
| Custom Web Experts | |
| Custom Web N Logo Designs | |
| Custom Wire Technologies, Inc. | Wisconsin |
| CustomCPU | Alaska |
| CustomDesign360 | |
| Customer Analytics, LLC | Wisconsin |
| Customer Engagement Technologies | Nevada |
| Customer FX Corporation | Minnesota |
| Customer Labs, Inc. | Delaware |
| Customer Paradigm | Colorado |
| Customer Success Collective | California |
| Customer.io | Oregon |
| CustomerDriven.com | Michigan |
| CustomerHub | Arizona |
| CustomerInsights.AI | Arizona |
| Customers.ai | Massachusetts |
| Customertimes | |
| CustomerXi | Texas |
| CustomGPT.ai | Massachusetts |
| CustomGuide, Inc. | Minnesota |
| CustomInsight | Nevada |
| Customized Information Systems | Ohio |
| CustomLogic, LLC | California |
| CustomPay, Inc. | Maryland |
| CustomRF, Inc. | Massachusetts |
| CustomShow | New York |
| CustomUSB | Illinois |
| CustomWare Designs, Inc. | Utah |
| Customware, Inc. | Kentucky |
| CustomWebApps | California |
| Custora | New York |
| Cutback Corporation | |