| Kontrollansvarig Kalle Nordlund AB | Bergshamra | 0 tkr |
| Kraftteknik i Stockholm AB | Åkersberga | 0 tkr |
| Kragsta Konsult AB | Edsbro | 0 tkr |
| KRS Lyft och Transport Holding AB | Norrtälje | 0 tkr |
| Krutdurken AB | Rimbo | 0 tkr |
| KS Infrastructure AB | Stockholm | 0 tkr |
| K.S.R AB | Norrtälje | 0 tkr |
| Kujenga AB | Vätö | 0 tkr |
| Kulinvest AB | Norrtälje | 0 tkr |
| Kundvärdet Sverige AB | Norrtälje | 0 tkr |
| Kvarnåsen Projektering AB | Rimbo | 0 tkr |
| Kvisthamra Gruppen AB | Nacka | 0 tkr |
| Kvisthamra Invest AB | Norrtälje | 0 tkr |
| Kvistra Invest AB | Norrtälje | 0 tkr |
| K WALTER B BYGG AB | Rimbo | 0 tkr |
| KW Fabriken AB | Hallstavik | 0 tkr |
| Kylstickan Aktiebolag | Norrtälje | 0 tkr |
| Lagom E Kass AB | Hallstavik | 0 tkr |
| Läkkage AB | Blidö | 0 tkr |
| LAL Invest AB | Norrtälje | 0 tkr |
| LANDSKAPSKOMPANIET NORRTÄLJE AB | Norrtälje | 0 tkr |
| Larope Invest AB | Bergshamra | 0 tkr |
| Lars-Åke Karlsson AB | Norrtälje | 0 tkr |
| Lars Andersson i Norrtälje AB | Norrtälje | 0 tkr |
| Larshammar Holding AB | Norrtälje | 0 tkr |
| Lars Knotan Eriksson AB | Norrtälje | 0 tkr |
| Larssons Ris & Flis AB | Hallstavik | 0 tkr |
| Låskungarna i Norrtälje AB | Norrtälje | 0 tkr |
| Laurén Invest AB | Norrtälje | 0 tkr |
| LBV i Norrtälje AB | Norrtälje | 0 tkr |
| Learn i Norrtälje AB | Norrtälje | 0 tkr |
| Ledinge Redovisning Siltberg AB | Täby | 0 tkr |
| Leif Flink Ventilation AB | Norrtälje | 0 tkr |
| Lejon & Partner AB | Sundbyberg | 0 tkr |
| Lena Blomqvist AB | Norrtälje | 0 tkr |
| Lennart Palmgren Försäkringsjuridik AB | Blidö | 0 tkr |
| L exec management aktiebolag | Onslunda | 0 tkr |
| LH Jansson Åkeri Aktiebolag | Norrtälje | 0 tkr |
| Lignelid Spara AB | Norrtälje | 0 tkr |
| Liljekullen FM AB | Norrtälje | 0 tkr |
| Liljeng Holding AB | Väddö | 0 tkr |
| Lillben & Zaire AB | Edsbro | 0 tkr |
| LIMK Holding AB | Norrtälje | 0 tkr |
| Lindblad & Mattsson AB | Hallstavik | 0 tkr |
| Lindblom Rental AB | Riala | 0 tkr |
| Lindholmen Bostadsexploatering AB | Norrtälje | 0 tkr |
| Lindris Holding AB | Hallstavik | 0 tkr |
| LINGUISTRATOR Aktiebolag | Hallstavik | 0 tkr |
| Linjett AB | Norrtälje | 0 tkr |
| LiThe Sweden Holding AB | Norrtälje | 0 tkr |