| ScanCastor A/S | 4040 | Jyllinge |
| Scanditron Danmark A/S | 8250 | Egå |
| SCANKAB | 5560 | Aarup |
| Scanmaster ApS | 4000 | Roskilde |
| Schmersal Danmark A/S | 2750 | Ballerup |
| Schneider Electric Danmark A/S | 2750 | Ballerup |
| Schur Technology a/s | 8700 | Horsens |
| SELEKTRO A/S | 9632 | Møldrup |
| Seritronic A/S | 9530 | Støvring |
| Shark & Co. A/S | 8700 | Horsens |
| Sicatech A/S | 7600 | Struer |
| SICK A/S | 3460 | Birkerød |
| Siemens A/S | 2750 | Ballerup |
| Siemens Wind Power A/S | 7330 | Brande |
| Sik Teknik ApS | 8643 | Ans By |
| Sika Footwear A/S | 7400 | Herning |
| Silkeborg Plast A/S | 8600 | Silkeborg |
| Skanem Hobro A/S | 9500 | Hobro |
| Skilteproduktion ApS | 9400 | Nørresundby |
| Skiltex | 2610 | Rødovre |
| SMC Danmark A/S | 8700 | Horsens |
| SMVdanmark | 2300 | København S |
| Solar Partner ApS | 2100 | København Ø |
| Solid Software Development ApS | 9000 | Aalborg |
| Spelsberg A/S | 5800 | Nyborg |
| Spica Technology ApS | 8600 | Silkeborg |
| SSI SCHÄFER A/S | 9560 | Hadsund |
| Stener & Larsen ApS | 3490 | Kvistgård |
| Stennevad | 6715 | Esbjerg N |
| STOK Emballage K/S | 5550 | Langeskov |
| Strenometer ApS | 2830 | Virum |
| Styromatic A/S | 8220 | Brabrand |
| Sur-Tech A/S | 3520 | Farum |
| Swede Electronics A/S | 8700 | Horsens |
| SynFlex A/S | 3500 | Værløse |
| Sørensen & Kofoed A/S | 2730 | Herlev |