| Applied Sciences Inc. | Cedarville, Ohio, United States |
| Applied Surface Technologies | New Providence, New Jersey, United States |
| Applied Thin Films Inc. | Evanston, Illinois, United States |
| Aptech Systems Inc. | Maple Valley, Washington, United States |
| ARCH Venture Partners | Chicago, Illinois, United States |
| Ardesta LLC | Ann Arbor, Michigan, United States |
| Arete Corp. | Center Harbor, New Hampshire, United States |
| Argonaut Technologies | Foster City, California, United States |
| Argonide Corp. | Sanford, Florida, United States |
| Argonne National Laboratory | Argonne, Illinois, United States |