| Ampersand Consulting | |
| Ampex Data Systems Corporation | California |
| Amphastar Pharmaceuticals, Inc. | |
| Amphenol Advanced Sensors | Pennsylvania |
| Amphenol Aerospace | |
| Amphenol Broadband Solutions | Connecticut |
| Amphenol Corporation | Connecticut |
| Amphenol Griffith Enterprises | Michigan |
| Amphenol Network Solutions | Washington |
| Amphenol NEXUS Technologies, Inc. | Connecticut |
| Amphenol PCD | |
| Amphenol RF | Connecticut |
| Amphenol T&M Antennas | Illinois |
| Amphion Communications | Florida |
| Amphix Bio | |
| Amphora Creative, LLC | |
| Amphus, Inc. | California |
| AMPL Optimization, Inc. | New Mexico |
| Ampla Technologies, Inc. | New York |
| Ample | California |
| Ample, LLC | |
| Amplēo | Utah |
| Amplex Electric, Inc. | Ohio |
| Amplexd Therapeutics, Inc. | |
| Amplical Corporation | New Jersey |
| AmplifAI Solutions, Inc. | Texas |
| Amplifi Vascular | |
| Amplifica Holdings Group, Inc. | |
| AmplifiDx, Inc. | California |
| Amplified AI, Inc. | California |
| Amplified Digital Agency | |
| Amplified Sciences, LLC | Indiana |
| Amplifier | |
| Amplifier | |
| Amplifier Management, LLC | Virginia |
| Amplifire | Colorado |
| Amplify 11 | |
| Amplify Digital Marketing, LLC | |
| Amplify Digital, LLC | Illinois |
| Amplify Industrial Marketing + Guidance | North Carolina |
| Amplify Interactive | California |
| Amplify Online | |
| Amplify Partners | California |
| Amplify Surgical | California |
| Amplify, LLC | California |
| Amplify.LA | California |
| Amplimark, LLC | |
| Amplion | Virginia |
| AmpliTech, Inc. | New York |
| Amplitude, Inc. | California |