| Lacuna A/S | 5550 | Langeskov |
| Lafuco A/S - specialdesignede glasvægge | 2635 | Ishøj |
| LAMILUX Nordic A/S | 4800 | Nykøbing F. |
| LAMIPRO A/S | 8940 | Randers NV |
| Larko Magnet International A/S | 2740 | Skovlunde |
| Larsen og Jensen Teknik | 9240 | Nibe |
| Laufen Nordic A/S | 4600 | Køge |
| Lauridsen Handel & Import A/S | 6800 | Varde |
| Lauridsen Rørteknik A/S | 6800 | Varde |
| Lauritz Knudsen | 2750 | Ballerup |
| Layher ApS | 2620 | Albertslund |
| Learnmark Horsens | 8700 | Horsens |
| Leasing Fyn | 5250 | Odense SV |
| Led-Tek A/S | 8723 | Løsning |
| Leica Geosystems A/S | 2860 | Søborg |
| Lemvigh-Müller A/S | 2730 | Herlev |
| Leoka A/S | 9620 | Aalestrup |
| LIFA A/S Landinspektører | 5260 | Odense S |
| Lifestyle & Design Cluster | 7400 | Herning |
| Lilleheden A/S | 9850 | Hirtshals |
| Lim-Tech ApS | 7120 | Vejle Øst |
| LINATECH A/S | 8620 | Kjellerup |
| Lindab A/S | 6100 | Haderslev |
| LINDLARSEN A/S | 7400 | Herning |
| Lindpro a/s | 2600 | Glostrup |
| Linolie Døre & Vinduer ApS | 7570 | Vemb |
| Linotol A/S | 5500 | Middelfart |
| Liqflow A/S | 7100 | Vejle |
| Lissner ApS | 5260 | Odense S |
| Listefabrikken I C A/S | 9881 | Bindslev |
| Ljungdahl A/S | 3450 | Allerød |
| LM Byg A/S | 2670 | Greve |
| Lomac A/S | 5330 | Munkebo |
| Lotek A/S | 6400 | Sønderborg |
| LOXAM A/S | 2600 | Glostrup |
| Lph Byg a/s | 8362 | Hørning |
| Lundhild ApS | 8700 | Horsens |
| Lynddahl A/S | 6760 | Ribe |
| Lys & El 2019 | 2300 | København |
| Løwener A/S | 2600 | Glostrup |
