| MR.NET | New York |
| MrAdmin | Illinois |
| MRC | |
| MrDataMining | Ohio |
| MRDesignWorks.com | Illinois |
| MREI | Nevada |
| MRI Software, LLC | Ohio |
| MRI Technologies | |
| MRIGlobal | |
| MRK Computer Services, Inc. | New York |
| MRK Technologies | Ohio |
| MRM | |
| MRoadie, LLC | California |
| Mroads | Texas |
| MrPoc | New York |
| MRSI Systems | Massachusetts |
| MS Bioworks | Michigan |
| MS Comp Services, Inc. | |
| MS Miami International Software | Florida |
| MS Technology, Inc. | North Carolina |
| MS&P International, Inc. | Florida |
| MSA Systems, Inc. | |
| MsAccessConsulting.com | Virginia |
| MSB Docs | California |
| MSC Software | California |
| MSCI, Inc. | New York |
| MSD Computer Services | California |
| MSE Audio | Kansas |
| Msen | Michigan |
| MSEO, LLC | District of Columbia |
| MSI Communications | Alaska |
| MSI Data | Wisconsin |
| MSI DFAT Services, LLC | |
| MSI Software Solutions, LLC | |
| MSITEK, LLC | |
| MSLInsight | Texas |
| MSN Global IT Solutions | |
| Msoft | |
| MSP Solutions | California |
| MSPAlliance | North Carolina |
| MSPSOS | |
| MSQ Ventures | New York |
| MSS Business Transformation Advisory | Arizona |
| MSW Interactive Designs | Colorado |
| MSYS, Inc. | |
| MT Box Computers | Indiana |
| MT Bytes | Vermont |
| MT Group | California |
| MT Systems, Inc. | California |
| Mt Xia, Inc. | Tennessee |