| Hans Følsgaard A/S | 4600 | Køge |
| Harald Pihl A/S | 2970 | Hørsholm |
| Hauge Stål | 5270 | Odense N |
| HBO Solutions ApS | 2200 | København N |
| Hedema A/S | 8700 | Horsens |
| Helens Rør A/S | 5500 | Middelfart |
| Helge Bruhn A/S | 6400 | Sønderborg |
| Helge Frandsen Varmeteknik A/S | 8783 | Hornsyld |
| HellermannTyton | 4000 | Roskilde |
| Hentechsolution ApS | 2670 | Greve |
| HiFlux Filtration A/S | 8722 | Hedensted |
| HIN A/S | 8700 | Horsens |
| Hirtshals El-Motorservice ApS | 9850 | Hirtshals |
| HN Group A/S | 7190 | Billund |
| Hobro Rustfri Procesteknik A/S | 9500 | Hobro |
| Hoffmann Group | 28832 | Achim |
| Holtab Danmark | 6000 | Kolding |
| Holtec Automatic A/S | 6715 | Esbjerg N |
| Hoyer | 8370 | Hadsten |
| Hymatik ApS | 5250 | Odense SV |
| HYTOR A/S | 6705 | Esbjerg Ø |
| HYTOR Tools Solutions A/S | 6705 | Esbjerg |
| Høj Nordic Marine Contractor A/S | 8700 | Horsens |
| Høyrup & Clemmensen A/S | 2450 | København SV |