| Plany AS | Gursken | 1967 |
| Plasman AS | Raufoss | 1990 |
| Plasman Industri AB | Se-412 63 Göteborg | 2013 |
| Plasser Scandinavia A/S Nuf | Dk-2820 Gentofte | 2026 |
| Plast AS | Fredrikstad | 2020 |
| Plast Og Montasje AS | Oteren | 2022 |
| Plastbåtservice AS | Slependen | 2015 |
| Plasteriet AS | Trondheim | 2022 |
| Plasticon the Netherlands B.V. | 7553Gn Hengelo | 2022 |
| Plastinvent AS | Sæbøvågen | 1986 |
| Plastkortfabrikken AS | Paradis | 2012 |
| Plasto AS | Åndalsnes | 1988 |
| Plastservice AS | Tranøy | 2013 |
| Plate Og Sveiseservice AS | Bardu | 2018 |
| Platech AS | Borre | 1995 |
| Plateteknikk AS | Spydeberg | 2003 |
| Playing With Wires AS | Hommelvik | 2026 |
| Playmobilbutikken AS | Helle | 2011 |
| Pleat AS | Stavanger | 2001 |
| Pleat Coolers AS | Stavanger | 2024 |
| Plenkrutt AS | Kleppe | 2026 |
| Pless Industri AS | Skien | 2021 |
| Plexon AS | Skallestad | 2001 |
| Plexx AS | Kråkerøy | 1999 |
| Plommen Frukt AS | Sarpsborg | 2020 |
| Plommen I Egget Da | Kløfta | 2004 |
| Pluggfabrikken Tor AS | Mauseidvåg | 1979 |
| Plumbo AS | Vøyenenga | 1998 |
| Plus-Plus | Dk-4300 Holbæk | 2020 |
| Plümat, Plate & Lübeck GmbH & Co. KG | De-32339 Espelkamp | 2021 |
| PM Grafisk Sør AS | Arendal | 2013 |
| PMC Industriservice AS | Rjukan | 2016 |
| PMH Norway AS | Bosberg | 2017 |
| PMP Montex S.R.O. | Sk-821 07 Bratislava | 2020 |
| PMV AS | Mo I Rana | 2018 |
| PMV Service AS | Tanem | 2008 |
| Pneumatec AS | Husøysund | 2023 |
| Po Glasscoating Paul Jørs Og Olaf Markhus Ans | Foldrøyhamn | 1995 |
| Poa Invest AS | Sarpsborg | 2015 |
| Pocket Nest AS | Lillesand | 2022 |
| Pod Point Norge AS | Oslo | 2017 |
| Poem AS | Ski | 2005 |
| Poff Produkt Da | Songe | 2005 |
| Pohjanmaan Talotekniikka OY | Narvik | 2013 |
| Pohjaranta OY | Fi-27800 Säkylä | 2019 |
| Point Zero AS | Varhaug | 2009 |
| Poj Mekaniske AS | Sarpsborg | 1999 |
| Pol Contractors | Aksdal | 2005 |
| Pol Pro Spolka Z Ograniczona Odpowiedzialnoscia | Pl-81-827 Sopot | 2025 |
| Polam-Service | Bodø | 2012 |
| Polar Bear Coffee Roasters AS | Trondheim | 2017 |
| Polar Grenland AS | Porsgrunn | 2007 |
| Polar Maritim Service AS | Vannareid | 2018 |
| Polar Profilering AS | Bodø | 2025 |
| Polarbad AS | Skodje | 1997 |
| Polarfisk Nuf | Hell | 2003 |
| Polargo AS | Gardermoen | 2013 |
| Polargodt Svalbard AS | Longyearbyen | 2017 |
| Polaris S.R.L. Nuf | It-20052 Monza (Mb) | 2026 |
| Polaris Trykk Alta AS | Alta | 2012 |
| Polaris Trykk Arendal AS | Arendal | 1996 |
| Polaris Trykk AS | Heimdal | 2008 |
| Polaris Trykk Harstad AS | Harstad | 2004 |
| Polaris Trykk Orkanger AS | Orkanger | 2007 |
| Polaris Trykk Sunnhordland AS | Stord | 2021 |
| Polaris Trykk Trondheim AS | Heimdal | 1998 |
| Polaris Trykk Ålesund AS | Ålesund | 2008 |
| Polarmat AS | Tonnes | 2017 |
| Polarplast AS | Inndyr | 2013 |
| Polarrep Maskinservice AS | Longyearbyen | 2026 |
| Polarstein AS | Straumsjøen | 2021 |
| Polish Link | Pl-80 177 Gdansk | 2015 |
| Polkas Piotr Kubacki | Pl-38-220 Debowiec | 2016 |
| Polly Invest AS | Sandefjord | 2008 |
| Polmec Spolka Z Ograniczona Odpowiedzialnoscia Nuf | Pl-98-346 Skomlin | 2021 |
| Polmill R. Kurczab Spolka Komandytowo-Akcy Jna | Pl-32-130 Koszyce | 2026 |
| Polmont | Pl-35-234 Rzeszow | 2024 |
| Polship Ltd | Stavanger | 2007 |
| Poly Har AS | Vartdal | 1993 |
| Poly Industries AB | Se-981 91 Jukkasjärvi | 2023 |
| Polybo AS | Sandnes | 2008 |
| Polydisplay AS | Sandefjord | 1991 |
| Polyfemos AS | Alta | 2024 |
| Polyform AS | Ålesund | 1998 |
| Polynt Composites Norway AS | Gamle Fredrikstad | 2017 |
| Polypure AS | Fornebu | 1999 |
| Polyvox Norge AS | Holmestrand | 1992 |
| Pomelo AS | Oslo | 2020 |
| Pompel & Pilt AS | Vollen | 2022 |
| Pompel Og Pilt Hobbykeramikk Da | Oslo | 1999 |
| Pontech Marina AS | Nøtterøy | 2019 |
| Popsykkel AS | Elverum | 2023 |
| Porin Teollisuusputki OY | Fi-28760 Pori | 2024 |
| Porolon AS | Ålesund | 1951 |
| Pors Gjerdefabrikk AS | Porsgrunn | 2002 |
| Porsanger Treindustri AS | Lakselv | 2010 |
| Porsgrunds Porselænsfabrik AS | Porsgrunn | 1885 |
| Porsgrunn Ladetjeneste Svendsen & Kassa Ans | Porsgrunn | 1987 |
| Port Og Alarmsystem AS | Rygge | 2004 |
| Port-Teknikk AS | Skien | 2012 |