| nystudio107 | |
| NYSYS airAccess, LLC | New York |
| Nytricx, Inc. | |
| NytroSEO | New York |
| Nytwork | |
| NYU Tandon Future Labs | New York |
| NYU Urban Future Lab | New York |
| O'Callaghan Technology, LLC | Rhode Island |
| O'Connell Meir, LLC | |
| O'Connor Connective, LLC | |
| O'Daniel Designs, LLC | Washington |
| O'Keefe Life Sciences | |
| O'Kelly Co. | |
| O'Neil Software, Inc. | California |
| O'Reilly AlphaTech Ventures, LLC | California |
| O'Reilly Media, Inc. | California |
| O.B. One Communications | South Carolina |
| O.N. Diagnostics, LLC | |
| O.Y.E. Intelligence | Arizona |
| O16 Labs | |
| O2 Digital Creative Agency | |
| O2 Group | Colorado |
| O2 Interactive | Virginia |
| O2B Technologies | Montana |
| O3 Insights, Inc. | Alabama |
| O3 World, LLC | Pennsylvania |
| O8 | Minnesota |
| o9 Solutions, Inc. | Texas |
| OACYS Technology | |
| Oak City Tech | |
| Oak Harbor Web Designs | |
| Oak HC/FT | Connecticut |
| Oak Hills Christian College | Minnesota |
| Oak Investment Partners | |
| Oak Leaf Systems, Inc. | Maine |
| Oak Media | |
| Oak Radius | |
| Oak Ridge Institute for Science and Education | |
| Oak Ridge National Laboratory | Tennessee |
| Oak Ridge National Laboratory - Computer Science and Mathematics Division | Tennessee |
| Oak Software | |
| OAK Studios Corporation | |
| Oak Studios, LLC | |
| Oak Theory | |
| Oak Web Works, LLC | Massachusetts |
| Oakford Media | Connecticut |
| Oakland City University | Indiana |
| Oakland Startup Network | California |
| Oakland University Department of Mathematics and Statistics | Michigan |
| Oakland University School of Computer Science and Engineering | Michigan |