| Acivilate, Inc. | Georgia |
| ACK Computing | Vermont |
| Acklen Avenue, LLC | Tennessee |
| Ackley Machine Corporation | |
| acKnowledge, LLC | New York |
| ACL Computers | Florida |
| Aclaimant | |
| Aclara | Missouri |
| Aclarion | Colorado |
| Aclaris Therapeutics, Inc. | Pennsylvania |
| Aclass Web Sites | New York |
| Aclid, Inc. | |
| Aclipse Therapeutics | Pennsylvania |
| Aclymate | Colorado |
| ACM Computers | California |
| ACM Research, Inc. | California |
| ACM Technologies, Inc. | California |
| Acme Bioscience, Inc. | California |
| Acme Continental Credit Union | |
| ACME Design Co. | Florida |
| ACME Digital Design | California |
| Acme Federal Credit Union | |
| Acme Internet Services | Oklahoma |
| Acme Micro Systems, Inc. | California |
| ACME PCB Assembly | California |
| Acme Portable Machines, Inc. | California |
| ACME VC | California |
| Acmeware, Inc. | Massachusetts |
| ACMG Federal Credit Union | |
| ACNB Bank | |
| Acnodes Corporation | California |
| ACOM Health | Georgia |
| ACOM Solutions | California |
| Acommerce, Inc. | North Carolina |
| Acon Investments, LLC | District of Columbia |
| ACON Laboratories, Inc. | California |
| Aconcagua Ventures, LLC | California |
| Acopian Technical Company | Pennsylvania |
| Acorda Therapeutics, Inc. | New York |
| Acordex Imaging Systems | Massachusetts |
| Acorn Digital Strategy | California |
| Acorn Interactive | California |
| Acorn Recording Solutions, Inc. | New Hampshire |
| Acorns Grow, Inc. | California |
| Acounting & Computer Solutions, Inc. | District of Columbia |
| Acoustic MedSystems, Inc. | Illinois |
| Acoustic Web Design | Louisiana |
| ACP/TPF, Inc. | Texas |
| ACPE Federal Credit Union | |
| Acperion | Colorado |