| 1 | lemminkäinen infra oy | €453.1M | 3,000 | 70 |
| 2 | Ekovilla Oy | €74.0M | 125 | 60 |
| 3 | smaragdus group | €69.3M | 350 | 60 |
| 4 | Arom-dekor Kemi Oy | €36.2M | 125 | 60 |
| 5 | Umacon Oy | €18.9M | 125 | 60 |
| 6 | Kaakkois-Suomen TE-toimisto | €17.7M | 350 | 60 |
| 7 | CTS Engtec | €15.3M | 125 | 60 |
| 8 | Kaakkois-Suomen ELY-keskus | €12.6M | 125 | 60 |
| 9 | Elementit-E Oy | €12.2M | 30 | 60 |
| 10 | Kouvolan Lakritsi Oy | €7.4M | 30 | 50 |
| 11 | Agri-Kymi Oy (Ltd) | €7.0M | 30 | 50 |
| 12 | Saviston koti Oy | €6.7M | 125 | 50 |
| 13 | fin kotimaan puhelinpalvelut oy | €6.5M | 125 | 50 |
| 14 | Anteplan Oy | €6.0M | 30 | 50 |
| 15 | DCS Oy | €6.0M | 30 | 50 |
| 16 | Tarvike-Ahola Oy | €5.9M | 30 | 50 |
| 17 | IGDA Kymenlaakso Hub | €3.9M | 30 | 50 |
| 18 | Autopro Kouvola Oy
Retail sale of automotive fuel | €3.8M | -- | 65 |
| 19 | ldv hitsaus oy | €3.7M | 30 | 50 |
| 20 | Kymen Valvonta ja Vartiointi Oy | €3.5M | 30 | 50 |
| 21 | LUT Kouvola | €3.4M | 30 | 50 |
| 22 | Kyynaama Oy
Computer programming activities | €3.3M | -- | 50 |
| 23 | Partneria Oy
Computer programming activities | €3.3M | -- | 50 |
| 24 | Tietomyrsky Oy
Computer programming activities | €3.3M | -- | 50 |
| 25 | Kymenlaakson liitto | Regional Council of Kymenlaakso | €3.0M | 30 | 50 |
| 26 | Liiketoiminnan data-analytiikka | €2.8M | 30 | 50 |
| 27 | Kellokortti | €2.8M | 30 | 50 |
| 28 | Kouvolan Seudun Osuuspankki | €2.6M | 30 | 50 |
| 29 | KAPU Roastery Oy | €2.5M | 5 | 50 |
| 30 | kymijoen vesi ja ympäristö ry | €2.2M | 30 | 50 |
| 31 | Jätehuolto E.Parkkinen | €2.2M | 30 | 50 |
| 32 | kcl kymen laboratories ltd | €2.2M | 30 | 50 |
| 33 | ekokaari | €2.2M | 30 | 50 |
| 34 | deftec consulting | €2.1M | 5 | 50 |
| 35 | Railgate Finland Oy | €2.0M | 5 | 50 |
| 36 | LogistiX | €2.0M | 5 | 50 |
| 37 | Suu & hammas | €1.6M | 30 | 50 |
| 38 | Bikehike Bike Tours | €1.4M | 5 | 50 |
| 39 | KaaKau | €1.4M | 5 | 50 |
| 40 | AVENATUR | €1.2M | 5 | 50 |
| 41 | mykkä hiihtäjä oy | €1.2M | 30 | 50 |
| 42 | JFT Parts Rotors Oy LTD | €1.2M | 5 | 50 |
| 43 | bevesys finland oy | €1.1M | 5 | 50 |
| 44 | Simo Arola Clothing Oy | €1.1M | 5 | 50 |
| 45 | Keksintösäätiö - Foundation for Finnish Inventions | €1.1M | 5 | 50 |
| 46 | TuJu Mallinnus Oy | €990K | 5 | 40 |
| 47 | KCC Kouvolan Konsulttikeskus Oy | €990K | 5 | 40 |
| 48 | Kouvolan Autosompa Oy | €951K | 5 | 40 |
| 49 | Insinor Oy | €871K | 5 | 40 |
| 50 | CallDaddy Oy | €851K | 5 | 40 |
| 51 | Unicorn Cloud Consulting Service | €851K | 5 | 40 |
| 52 | nirvana wellness & tea shop | €834K | 5 | 40 |
| 53 | Leftlane Oy
Freight transport by road | €762K | -- | 40 |
| 54 | sg elementit oy | €755K | 5 | 40 |
| 55 | TuoRent Oy | €755K | 5 | 40 |
| 56 | Kouvolan KooKoo | €688K | 30 | 40 |
| 57 | mopp | €683K | 30 | 40 |
| 58 | kymijoen nuorisoyhdistys | €683K | 30 | 40 |
| 59 | Eerolan Rahti Oy
Freight transport by road | €640K | -- | 40 |
| 60 | Kuljetusliike A. Kähkönen Oy
Freight transport by road | €640K | -- | 40 |
| 61 | Cup O' Design | €627K | 5 | 40 |
| 62 | LCA Engineering Oy | €627K | 5 | 40 |
| 63 | Taikasipuli | €627K | 5 | 40 |
| 64 | Janne Torikka - Photography | €627K | 5 | 40 |
| 65 | suomen puhallintekniikka oy | €612K | 5 | 40 |
| 66 | eTilintarkastus Suomi Oy
Auditing activities | €608K | -- | 65 |
| 67 | Wiking Security | €576K | 5 | 40 |
| 68 | Koeda Consulting | €473K | 5 | 40 |
| 69 | Igventure | €473K | 5 | 40 |
| 70 | Alforza Avoin Yhtiö | €473K | 5 | 40 |
| 71 | motoworks finland oy | €465K | 5 | 40 |
| 72 | Mikaelkytonen.fi | €444K | 5 | 40 |
| 73 | Virgosofts | €444K | 5 | 40 |
| 74 | emergency medicine camp | €377K | 30 | 40 |
| 75 | Kouvolan Rautatie- ja Aikuiskoulutus Oy - KRAO | €355K | 30 | 40 |
| 76 | promiga consulting oy - toiminta tauolla 1.1.2025 alkaen | €353K | 5 | 40 |
| 77 | peittonet oy | €353K | 5 | 40 |
| 78 | Futuhima | €328K | 5 | 40 |
| 79 | c.t.s consulting | €319K | 30 | 40 |
| 80 | Kohoa Synergiakeskus Oy | €311K | 5 | 40 |
| 81 | Ostrealis Oy | €311K | 5 | 40 |
| 82 | Sijoitusoskarit Oy
Other activities auxiliary to financial services, | €306K | -- | 65 |
| 83 | S & M Parikka Oy
Other real estate activities on a fee or contract | €285K | -- | 65 |
| 84 | Hammashelppi | €269K | 5 | 40 |
| 85 | Opiskelijakunta Kaakko / Student Union Kaakko | €269K | 30 | 40 |
| 86 | stensec oy | €258K | 5 | 40 |
| 87 | Eezy Personnel / Eezy Henkilöstöpalvelut Kouvola & Lahti | €253K | 5 | 40 |
| 88 | Hevi Yrityspalvelut Oy | €183K | 5 | 40 |
| 89 | AnnaS Hammas Oy
Dental practice care activities | €162K | -- | 65 |
| 90 | Datasafe Oy | €151K | 5 | 40 |
| 91 | bitsmith oy | €141K | 5 | 40 |
| 92 | Flamo Oy | €136K | 5 | 40 |
| 93 | Wiliacain Oy | €136K | 5 | 40 |
| 94 | Projekticon Oy Ltd | €136K | 5 | 40 |
| 95 | Productivity Partners Oy | €136K | 5 | 40 |
| 96 | Monikulttuurikeskus Saaga ry - Multicultural Centre Saaga | €123K | 5 | 40 |
| 97 | Sudet Salibandy | Sudet Floorball | €115K | 5 | 40 |
| 98 | Sudet Jalkapallo | Sudet Football club | €115K | 5 | 40 |
| 99 | Expoeast Ltd / Expoeast Oy | €110K | 1 | 40 |
| 100 | Mainostoimisto Sepeteus Oy | €108K | 5 | 40 |