| Luxmed Handelsbolag | Valdemarsvik | — |
| MAC oil consultant AB | Oskarshamn | — |
| Mad Merch Club AB | Oskarshamn | — |
| Managrottan AB | Oskarshamn | — |
| MANÅM Clothing Handelsbolag | Oskarshamn | — |
| Mantebo Art of Craft AB | Oskarshamn | — |
| MatCat AB | Oskarshamn | — |
| Matheko AB | Oskarshamn | — |
| Mathias.Rabenius AB | Oskarshamn | — |
| Mat och Service i Oskarshamn AB | Figeholm | — |
| M holder AB | Kristdala | — |
| MM frisörer Handelsbolag | Mörbylånga | — |
| Mouli Sweden AB | Oskarshamn | — |
| MS Maskiner Handelsbolag | Oskarshamn | — |
| Naoume Clinic AB | Oskarshamn | — |
| Next order 24/7 AB | Oskarshamn | — |
| NFL Consult AB | Oskarshamn | — |
| Nilajo Fritidsservice Handelsbolag | Oskarshamn | — |
| NSK i Oskarshamn AB | Oskarshamn | — |
| Örnek i Oskarshamn Handelsbolag | Oskarshamn | — |
| Oskar-Man Flytt & Städ AB | Oskarshamn | — |
| Oskarshamn Petroleum AB | Oskarshamn | — |
| OskarshamnsSotarna Kommanditbolag | Påskallavik | — |
| Ostkustens Hälsa AB | Oskarshamn | — |
| Ostkustens Petroleumservice Handelsbolag | Västervik | — |
| Randows Marinservice AB | Oskarshamn | — |
| Saltstone Solutions AB | Oskarshamn | — |
| SAM ENTREPRENAD I OSKARSHAMN AB | Oskarshamn | — |
| Sams bil AB | Oskarshamn | — |
| Sams hår & barbershop AB | Oskarshamn | — |
| SCR Ventures AB | Oskarshamn | — |
| SecureGrid Sverige AB | Oskarshamn | — |
| Sedat Örnek AB | Oskarshamn | — |
| SGS AB | Oskarshamn | — |
| Sing & String Handelsbolag | Oskarshamn | — |
| Skärmhuset AB | Oskarshamn | — |
| Skoghem Rit-Mo Handelsbolag | Oskarshamn | — |
| SKRATT Å GRÅT Handelsbolag | Fårbo | — |
| Smålands mark och pool AB | Oskarshamn | — |
| Södertorns Nära AB | Oskarshamn | — |
| Southeast Holding AB | Oskarshamn | — |
| Stall Chit Chat Kommanditbolag | Oskarshamn | — |
| Strivio AB | Oskarshamn | — |
| Strömsholmskans Mässing Kommanditbolag | Figeholm | — |
| Studio Zern AB | Oskarshamn | — |
| Supertuben AB | Oskarshamn | — |
| Sveafastigheter Oskarshamn Mars 13 Handelsbolag | Malmö | — |
| TagStream AB | Oskarshamn | — |
| TEKKRA AB | Kristdala | — |
| Thelin & Johansson Borås AB | Oskarshamn | — |