| 1 | NEP | Neptune Air Sdn Bhd | IATA: N7, Callsign: Warisan, IATA Prefix: 264, Name changed to My Jet Xpress Airlines Sdn.Bhd. dba My Jet Xpress | MAL | AVCODES |
| 2 | NEP | NEPC Airlines ( A Division of NEPC Micon Limited) | IATA: D5, Callsign: Nepcair, Designator D5 recalled by IATA | IND | AVCODES |
| 3 | NEP | My Jet Xpress Airlines Sdn.Bhd. dba My Jet Xpress | IATA: N7, Callsign: Warisan, IATA Prefix: 264, Name changed from Neptune Air Sdn Bhd. | MAL | AVCODES |
| 4 | NEP | NEKOOSA EDWARDS PAPER | | | PWRC |
| 5 | NEPA | NEPA PALLET & CONTAINER CO INC | | | SCAC4 |
| 6 | NEPB | NATIONAL EXPRESS INC | | | SCAC3 |
| 7 | NEPC | NEPTUNE CONTRACT CARRIER INC | | | SCAC3 |
| 8 | NEPD | NEPSTAD OIL COMPANY | | | SCAC4 |
| 9 | NEPE | NEPECO CORPORATION | | | SCAC3 |
| 10 | NEPE | NEPTUN EXPRESS INC | | | SCAC4 |
| 11 | NEPF | NEWPORT AIR FREIGHT INC | | | SCAC3 |
| 12 | NEPF | NALCO COMPANY (NALCO ENERGY PRIVATE | | | SCAC4 |
| 13 | NEPI | N E W PLASTICS CORPORATION | | | SCAC3 |
| 14 | NEPJ | NITRO EXPRESS INC | | | SCAC3 |
| 15 | NEPL | NORTHWEST PALLET | | | SCAC4 |
| 16 | NEPM | NEPSTAD OIL | | | SCAC4 |
| 17 | NEPN | N E PENN SHIPPERS CO-OP ASSOCIATION | | | SCAC3 |
| 18 | NEPO | NORTHEAST TRANSPORT COMPANY | | | SCAC3 |
| 19 | NEPR | NEW ENTERPRISE STONE & LIME CO INC | | | SCAC4 |
| 20 | NEPS | NETWORK EXPRESS INC | | | SCAC3 |
| 21 | NEPS | NEP SUPERSHOOTERS LP | | | SCAC4 |
| 22 | NEPT | NEPTUNE WORLD-WIDE MOVING, INC | | | SCAC3 |
| 23 | NEPU | NEPTUNE GLOBAL LOGISTICS PTE LTD | | SGP | BIC |
| 24 | NEPU | NEPTUNE ORIENT LINES, LTD. | | | PWRC |
| 25 | NEPU | Neptune Orient Lines | | | RSRV |
| 26 | NEPU | NEPTUNE ORIENT LINES, LTD. | | | SCAC3 |
| 27 | NEPU | APL CO PTE LTD-NOL GROUP | | | SCAC4 |
| 28 | NEPW | NEW ENGLAND PUBLIC WEAREHOUSE INC | | | SCAC3 |
| 29 | NEPW | NEPW HOLDINGS INC | | | SCAC4 |
| 30 | NEPX | Nekoosa-Edwards Paper Co. | 7/1932-1/1941; 1/1943-1/1945 (not listed) | | NAKINA |
| 31 | NEPX | Nekoosa-Edwards Paper Co. | Apr-38 | | NRHS |
| 32 | NEPX | NEKOOSA-EDWARDS PAPER CO. | | | PWRC |
| 33 | NEPX | NATIONAL FRUIT PRODUCT CO INC | | | SCAC3 |
| 34 | NEPX | Nekoosa-Edwards Paper Co. | | USA | TRAFFIC |
| 35 | NEPZ | NEW ENGLAND PRODUCE CENTER | | | PWRC |
| 36 | NEPZ | FLEXI-VAN LEASING INC | | | SCAC4 |