| Uab Manjusta | Lt-46148 Kaunas | 2026 |
| Uab Manteka Nuf | Lt-98145 Skuodas | 2026 |
| Uab Margama Nuf | Lt-46251 Kaunas | 2025 |
| Uab Maudas Nuf | Henningsvær | 2022 |
| Uab Medroma | Lt-96291 Klaipedos | 2020 |
| Uab Mercury Decor | Fornebu | 2011 |
| Uab Mitna | Lt-76360 Siauliai | 2017 |
| Uab MK Service | 08401 Vilnius | 2016 |
| Uab MV Bygg | Plunge | 2012 |
| Uab Nolt | Kløfta | 2020 |
| Uab Norbyga | Kristiansand S | 2009 |
| Uab Nordroof Assembly Nuf | Lt-91248 Klaipeda | 2026 |
| Uab Norfloor | Oslo | 2006 |
| Uab Norstata | Oppdal | 2005 |
| Uab Norwegian Cabins | Lt-90166 Plunge | 2024 |
| Uab Novega Nuf | Kløfta | 2009 |
| Uab Novikontas TSS | Lt-94114 Klaipeda | 2013 |
| Uab Partnerbygg Nuf | Lt-78150 Siaulai City | 2011 |
| Uab Perkinta | Lt-09302 Vilnius | 2018 |
| Uab Resursas | Lt-89223 Mazeikiai | 2017 |
| Uab Rndv Industries Nuf | Lt-91184 Klaipeda | 2019 |
| Uab Robeks Statyba | Lt-62165 Alytus | 2019 |
| Uab Romedita | Lt-92235 Klaipeda | 2019 |
| Uab Roventus | Lt-13101 Vilniaus R Sav | 2015 |
| Uab RS Nauja Statyba | Fjellhamar | 2013 |
| Uab Rudesta | Lt - 89145 Mazeikiai | 2014 |
| Uab Rytu Statyba | Oslo | 2015 |
| Uab Savos Investicijos | Lt-97193 Kretingos R. | 2015 |
| Uab Scandi House | Sørumsand | 2013 |
| Uab Scanstatyba Nuf | Lt-74111 Jurbarkas | 2007 |
| Uab Scanteam | Lt - Prienu Rai | 2014 |
| Uab Siltas Bustas LT | Lt-91181 Klaipeda | 2014 |
| Uab Sintervalas | Lt-09132 Vilnius | 2019 |
| Uab Skyhus Nuf | Lt-96159 Maciuiciu K. Klaipedos R. | 2026 |
| Uab Smailys | 5663 Rietavas | 2008 |
| Uab Sopta | Lt-96177 Sakiniu K | 2017 |
| Uab Sorvindu | 46391 Kaunas | 2017 |
| Uab Sowelu | Lt-05120 Vilnius | 2019 |
| Uab Stakreta | Kretinga 97123 | 2016 |
| Uab Stalcorp Nuf | Lt-44326 Kaunas | 2015 |
| Uab Statotyra Ir Ko Nuf | Lt-85364 Akmanes R. | 2016 |
| Uab Tavo Statyba | Lt-91120 Klapeida | 2015 |
| Uab Techer Nuf | Lt-90115 Plunge | 2022 |
| Uab Telekomis | Lt-91251 Klaipéda | 2022 |
| Uab Termomontazas | Lt-9326 Klaipeda | 2010 |
| Uab Toromega Construction Nuf | Lt-92109 Klaipeda | 2026 |
| Uab Toromega Electricity Nuf | Lt-92109 Klaipeda | 2026 |
| Uab Toromega Insulation Nuf | Lt-92109 Klaipeda | 2026 |
| Uab Toromega Scaffolding Nuf | Lt-92109 Klaipeda | 2026 |
| Uab Unetransa Nuf | Lt-95128 Klaipeda | 2024 |
| Uab Vamzdynas | Lt-47177 Kaunas | 2026 |
| Uab Vilniaus Betono Demontavimo Technika Nuf | 01312 Vilnius | 2012 |
| Uab Vylima | Lt-89144 Mazeikiai | 2021 |
| Uab Wooden Skyscraper Nuf | 45230 Kaunas | 2011 |
| Uanz Bygg AS | Stavanger | 2008 |
| Uas AS | Kløfta | 2025 |
| Ub Bygg AS | Trollåsen | 2014 |
| Uba Glas & Fasad AB Nuf | Se-212 10 Malmø | 2017 |
| Uba Montage AB Nuf | Se-212 14 Malmö | 2017 |
| Ubuntu AS | Oslo | 2024 |
| Udahl Maskin AS | Snertingdal | 2014 |
| Udnes & Aas Bygg AS | Årnes | 2017 |
| Udnes & Holter Entreprenør AS | Årnes | 2020 |
| Udnes VVS AS | Årnes | 2025 |
| Udrea Stefan Bare Capsulate S.R.L. | Oslo | 2012 |
| Ue Maskin & Utleie AS | Sortland | 2024 |
| Ue Service AS | Tromsdalen | 2023 |
| Ueland AS | Nærbø | 2015 |
| Ueland AS | Nærbø | 2020 |
| Ueland Energi AS | Kleppe | 2022 |
| Ueland Holding AS | Kleppe | 2019 |
| Ues AS | Flateby | 1997 |
| Uffe Byggare V/Ulf Eriksson | Kongsvinger | 2005 |
| Ufo Eiendomsselskap AS | Ålesund | 1986 |
| Uglane Røyr Og Anlegg AS | Fardal | 2020 |
| Ugle Snekkerservice AS | Mosterøy | 2025 |
| UGM1 Holding AS | Kirkenes | 2022 |
| Ugna AS | Oslo | 2023 |
| Ugra | 1026 Riga | 2019 |
| Uhlen Maskin AS | Torpo | 2022 |
| Uhnger Invest AS | Oslo | 2005 |
| Uhren Holding AS | Maura | 2023 |
| Uir AS | Vear | 2016 |
| Ukkelberg Holding AS | Molde | 2014 |
| Ul Holding AS | Ankenes | 2020 |
| Uldis Bygg AS | Ålesund | 2012 |
| Uleberg Maskin Og Transport AS | Hovden I Setesdal | 1991 |
| Uleberg Og Trydal Maskin AS | Bykle | 2020 |
| Ulefoss Number One AS | Skien | 2024 |
| Ulev Bygg AS | Skien | 2023 |
| Ulf Catering Og Betong AS | Strusshamn | 2013 |
| Ulf Jørgensen Holding AS | Filtvet | 2005 |
| Ulf Reidar Tønnessen AS | Lillesand | 2020 |
| Ulf Wiklund Mur & Kakel | 793 33 Leksand | 2006 |
| Ulf's Holding AS | Lillehammer | 2010 |
| Ulfur AS | Jessheim | 2025 |
| Ulin Bygg AS | Gjerdsvika | 2024 |
| Ullaland Invest AS | Florø | 2017 |
| Ullensaker Bygg Og Vedlikehold AS | Algarheim | 2002 |
| Ullensaker Byggservice AS | Nannestad | 2024 |