| Hacker Dojo | California |
| Hacker Halted | Georgia |
| Hacker Noon | California |
| HackerEarth, Inc. | California |
| HackerOne, Inc. | California |
| Hackers/Founders | California |
| HackerX, Inc. | |
| Hackingtons Corporation | California |
| HackMD | |
| HackMiami | Florida |
| HackMIT | Massachusetts |
| HackNotice | Texas |
| hackNY | New York |
| HackPGH | Pennsylvania |
| Hackr.io | Florida |
| Hackster, Inc. | Delaware |
| HackTX | Texas |
| HackUTD | Texas |
| Hackworth Marketing | |
| HacWare, Inc. | New York |
| Hadamard Corporation | |
| Hadrian Automation, Inc. | California |
| Haemonetics Corporation | Massachusetts |
| Hagan Associates, LLC | Vermont |
| Hage & Company | California |
| Hageman & Company | Illinois |
| Hagen & Co., Inc. | Massachusetts |
| Hagen Business Systems | Arizona |
| Haggerty Media | |
| Hagstrom Electronics, Inc. | Virginia |
| HAI Laboratories, Inc. | Massachusetts |
| Hai Technologies, LLC | |
| Haigh-Farr, Inc. | |
| Haiku Deck, Inc. | Washington |
| Haiku Project | Florida |
| Haiku Software | Oregon |
| Haiku, Inc. | Nevada |
| HaiLa Technologies, Inc. | |
| Haily | Wyoming |
| Haima Therapeutics, LLC | |
| Hairy Glove | Ohio |
| Hakia | |
| Hakimo | California |
| Hakka IT School | |
| haku | |
| Hal Communications Corporation | New York |
| HAL Systems, LLC | New Jersey |
| Hala Systems, Inc. | Delaware |
| Halberd Corporation | |
| Halcyon | |