| Nielsen Norman Group | California |
| NielsenIQ | |
| Nielson Communications, Inc. | Wisconsin |
| Niftic Company | |
| Nifty Code, LLC | |
| Nifty Fifty Solutions | |
| Nifty Games, Inc. | California |
| Nifty Technologies, Inc. | New York |
| Niftygeek.com | Massachusetts |
| Niftywerks, Inc. | Oregon |
| Night & Day Media, LLC | Connecticut |
| Night Kitchen Interactive | |
| Night Owl Interactve | New York |
| Night Owl PCs | Iowa |
| NightCoders | |
| NightDragon | California |
| Nightfall AI | California |
| Nighthawk Marketing | |
| Nightingale Apps | Massachusetts |
| Nightingale-Conant Corporation | |
| NightLight Labs | |
| Nightshift Creative | |
| Nightship Networks | New Jersey |
| NightWare, Inc. | Minnesota |
| NihaoPay | California |
| NIILAA, LLC | |
| NIIT (USA), Inc. | Georgia |
| Nika Digital Agency | |
| NiKang Therapeutics, Inc. | |
| NiKnack Marketing | |
| Nikola Corporation | Arizona |
| NIKSUN, Inc. | New Jersey |
| Niktek | Connecticut |
| Nila, Inc. | |
| Nile | California |
| NileNET Ltd | Colorado |
| Nilogen Oncosystems | Florida |
| Nilus, Inc. | |
| Nily AI | |
| Nimbata, LLC | |
| NIMBL, LLC | Colorado |
| Nimble Gravity, LLC | |
| Nimble Technologies, LLC | |
| Nimble Worldwide | |
| Nimble, Inc. | California |
| NimbleBit | California |
| Nimblebot | |
| NimbleBox, Inc. | California |
| Nimbly Games, LLC | New Mexico |
| Nimbus Engineering, Inc. | California |