| Bedrift | Antall ansatte pr 2019 |
| Kongsberg Automotive ASA | 10 908 |
| FMC Kongsberg Subsea AS | 2 216 |
| NG Kiwi Innland AS | 1 286 |
| Kid ASA | 1 033 |
| Ng Kiwi Vest AS | 1 011 |
| Ng Kiwi Midt-Norge AS | 614 |
| Spenncon AS | 506 |
| GKN Aerospace Norway AS | 478 (2017 middeltall ) |
| Ringerikskraft AS | 375 |
| Dormakaba Norge AS | 187 |
| Imago Invest AS | 186 |
| Dresser-Rand AS | 174 |
| Prysmian Group Norge AS | 165 |
| Røine Holding AS | 153 |
| BMO Entreprenør AS | 153 |
| Norsk Teknisk Installasjon AS | 153 |
| Otra Norge AS | 146 |
| Krøderen Elektro AS | 139 |
| Chemring Nobel AS | 135 |
| Asko Drammen AS | 133 |
| Ild Holding AS | 123 |
| Orica Norway AS | 119 |
| Consolvo AS | 106 |
| Sparebank 1 Modum | 94 |
| Forenede Montører AS | 85 |
| MSD (Norge) AS | 83 |
| Strømsgodset Toppfotball | 81 |
| Tta Holding AS | 79 |
| Strøm Gundersen AS | 75 |
| Semcon Norge AS | 73 |
| Ask Holding AS | 71 |
| Toyota Norge AS | 71 |
| Eiker
Bolig AS | 70 |
| Addovation
AS | 63 |
| Økonomibistand
Sør AS | 60 |
| Grevik
AS | 58 |
| Wärtsilä
Valmarine AS | 56 |
| Holsfjord
Produkter DA | 55 |
| Nortech
AS | 55 |
| Splitkon
AS | 51 |
| Dr.
Holms Hotel AS | 50 |
| Euro-Blikk
& Tak AS | 49 |
| Rottefella
Holding AS | 48 |
| Benestad
Solutions AS | 48 |
| Rottefella
AS | 48 |
| Ultra AS | 47 |
| Midtkraft
AS | 47 |
| Heiberg
Invest AS | 47 |
| Consolvo
Support AS | 47 |
| Leos
Invest AS | 46 |
| Briskeby
Videregående Skole AS | 46 |
| Rødberg
Matsenter AS | 44 |
| Tyrifjord
Videregående Skole | 44 |
| Sanden
Hotell AS | 43 |
| Jp
Sandvold AS | 42 |
| Vinn
Industri Drammen AS | 42 |
| Obas Øst
AS | 38 |
| Rif
Holding AS | 37 |
| Pk Hus
AS | 37 |
| Steinsfjorden
Montessoriskole SA | 36 |
| Tre
Trapp AS | 36 |
| Toolpack
AS | 35 |
| HV Plast
AS | 35 |
| Valeo
Siemens Eautomotive Norway AS | 34 |
| Com2gether
AS | 34 |
| Norlights
Montessoriskole Drammen AS | 30 |
| Saxen AS | 30 |
| Lysaker
& Thorrud AS | 29 |
| Høyt
& Lavt AS | 29 |
| Rosendal
Skole | 29 |
| Ingebretsen
Holding AS | 28 |
| Endress
+ Hauser AS | 28 |
| Lier
Asvo AS | 27 |
| Skattekisten
Barnehage SA | 26 |
| O K Lie
AS | 26 |
| Drammen
Rørservice AS | 25 |
| Lapp
Norway AS | 25 |
| Rakon AS | 24 |
| Certex
Norge AS | 24 |
| Eiendomsmegleren
Ringerike Hadeland AS | 24 |
| Bjarne
Hjelmtvedt Sytilbehør AS | 24 |
| 100-Meterskogen
Barnehage AS | 24 |
| Fungames
AS | 24 |
| Merkur
Regnskap SA | 24 |
| Asfaltfres
AS | 24 |
| Diabas
Entreprenør AS | 23 |
| Pagar
Øst AS | 23 |
| Nøste
Barnehage SA | 23 |
| Steg
Entreprenør AS | 23 |
| Nhd AS | 22 |
| Walther
Kristiansen AS | 22 |
| O
Nørstebø & Sønn AS | 22 |
| Steam
Clean Buskerud AS | 22 |
| Noahs
Ark Miljøbarnehage AS | 22 |
| Børsen
Festlokaler og Catering AS | 22 |
| Olje- og
Energisenteret AS | 21 |
| Bever
Control AS | 21 |
| Sub
Buskerud AS | 20 |
| Lampeland
Bakeri Og Konditori AS | 20 |
| Lier
Rørsenter AS | 20 |
| Proffsenteret
AS | 20 |
| Bærgården
AS | 20 |