| Red Sweater Software, LLC | California |
| Red Tail Design Co. | Ohio |
| Red Toad Media | |
| Red Touch Media | Utah |
| Red Vascular Technology, LLC | Florida |
| Red Ventures | South Carolina |
| Red Wagon Growth Marketing Agency | |
| Red Wing Software, Inc. | Minnesota |
| Red Wolf Associates | North Carolina |
| Red+Company | |
| Red7e | |
| Redapt | Washington |
| RedBeam, Inc. | Georgia |
| Redberri | Missouri |
| RedBlack Software, LLC | New Hampshire |
| RedBlink | |
| Redbooth | California |
| Redbot Security | Colorado |
| Redbud Labs | |
| RedBuffer | Delaware |
| RedCappi, Inc. | Illinois |
| RedCat Systems, LLC | Colorado |
| Redclay Interactive | Georgia |
| RedCloud Capital, LLC | Colorado |
| Redcloud Systems, LLC | |
| REDCOM Laboratories, Inc. | New York |
| Redcort | California |
| Reddit | New York |
| Reddit, Inc. | California |
| Reddit, Inc. | |
| Redefine Web | |
| Redemptive Digital, LLC | |
| Redemptive Technology | |
| Redesign Health | |
| Redesign Science | New York |
| Redeye, Inc. | New Jersey |
| Redfin | |
| Redfin Solutions, LLC | Maine |
| RedfishGroup | New Mexico |
| RedFox | |
| Redfox Visual | |
| RedFusion Media | California |
| Redgate Associates, LLC | New Jersey |
| RedGizmo Digital Marketing | |
| Redgrave, LLP | |
| Redhale Web Design | Texas |
| Redhead Labs | |
| Redhead Marketing & PR | |
| Redhead Web Design | Illinois |
| Redhills Ventures | Nevada |