| Ultimes IV Ky | Helsinki | 2020 |
| Ultimes Ky | Helsinki | 2013 |
| Ultimes Parking Ky | Helsinki | 2013 |
| Ultimes V Ky | Helsinki | 2020 |
| Ultivista Oy | Espoo | 2001 |
| Ultra Pilots Oy | Tampere | 2004 |
| Ultra Property Partners Oy | Helsinki | 2024 |
| Ultra-Marketing Oy | Lahti | 1984 |
| Ultra-Selling Oy | Pori | 1982 |
| Ulver Oy | Nakkila | 1975 |
| Ulvila Data Park Development Oy | Ulvila | 2026 |
| Ulvila Invest Oy | Ulvila | 1987 |
| Ulvila Näkymä Oy | Ulvila | 2006 |
| Ulvilan Huoneistovuokraus Oy | Helsinki | 1989 |
| Ulvilan Hyvinvointikiinteistöt Oy | Ulvila | 2026 |
| Ulvilan Isännöintipalvelu Oy | Vanha-Ulvila | 1986 |
| Ulvilan Koti-ikkuna Oy | Ulvila | 2007 |
| Ulvilan Lintumetsä Oy | Osoite Tuntematon | 2010 |
| Ulvilan Uusikulma Oy | Pori | 1992 |
| Umatek Oy | Lahti | 1990 |
| Umbra Sofia Oy | Helsinki | 2008 |
| Umola Oy | Oulu | 2010 |
| UnReal Estate & Invest Oy | Klaukkala | 2021 |
| Una Casa LKV Oy | Masku | 2021 |
| Unajan Teollisuuskylä Oy | Unaja | 1989 |
| Unchained Real Estate Oy | Espoo | 2017 |
| UnelmaTupa LKV Oy | Hyvinkää | 2010 |
| Unelmaa Real Estate Oy | Masala | 2014 |
| Unelmakiinteistöt Oy | Jokioinen | 2018 |
| Unelmakodit LKV Oy | Vantaa | 2004 |
| Unelmatila Oy | Helsinki | 2019 |
| Unelmien Majatalo Oy | Heinola | 2024 |
| Unelmien kodit Oy | Helsinki | 2016 |
| Uness Capital Oy | Seinäjoki | 2005 |
| Ungern Invest Oy | Turku | 2026 |
| UniGe Oy | Turku | 2008 |
| Unibroker Oy | Espoo | 2018 |
| Unicarta Oy | Helsinki | 1987 |
| Unicorn dream Oy | Lempäälä | 2008 |
| Uniikki Toimitilat Oy | Oulu | 2016 |
| Unikkotien Pysäköinti Oy | Helsinki | 2019 |
| Unilahden Loma Oy | Paalasmaa | 1989 |
| Uninvest Oy | Kuusamo | 1988 |
| Union Seven Oy | Rauma | 2008 |
| Unitas Terveyspalvelut Oy | Söderkulla | 2009 |
| United Finland 2020 Bidco III Oy | Helsinki | 2019 |
| United Finland 2020 Bidco IX Oy | Helsinki | 2020 |
| United Finland 2020 Bidco Oy | Helsinki | 2019 |
| United Finland 2020 Bidco V Oy | Helsinki | 2019 |
| United Finland 2020 Bidco VII Oy | Helsinki | 2020 |
| United Finland 2020 Bidco XI Oy | Helsinki | 2020 |
| United Finland 2020 Bidco XIII Oy | Helsinki | 2020 |
| United Finland 2020 Bidco XV Oy | Helsinki | 2020 |
| United Finland 2020 Bidco XVII Oy | Helsinki | 2021 |
| United Finland 2021 Bidco III Oy | Helsinki | 2021 |
| United Finland 2021 Bidco Oy | Helsinki | 2021 |
| United Finland 2022 Bidco Holding Oy | Helsinki | 2023 |
| United Finland 2022 Bidco Oy | Helsinki | 2021 |
| United Finland 2023 A1 Bidco Oy | Helsinki | 2023 |
| United Finland 2023 A2 Bidco Oy | Helsinki | 2023 |
| United Finland 2023 A3 Bidco Oy | Helsinki | 2023 |
| United Finland 2023 A4 Bidco Oy | Helsinki | 2023 |
| United Finland 2023 Bidco A Oy | Helsinki | 2023 |
| United Finland 2023 Bidco Oy | Helsinki | 2023 |
| United Finland 2024 A1 Bidco Oy | Helsinki | 2023 |
| United Finland 2024 A2 Bidco Oy | Helsinki | 2023 |
| United Prosperity Oy | Helsinki | 2026 |
| United Trusts Oy | Helsinki | 1987 |
| Unity Domus Oy | Helsinki | 2025 |
| Unity Kiinteistöt Oy | Helsinki | 2023 |
| Univelat Oy | Osoite Tuntematon | 2020 |
| Universtas Oy | Turku | 1990 |
| Unlimited Property Investment Oy | Jyväskylä | 2022 |
| Uno Invest Oy | Kuopio | 2023 |
| Unovel Oy | Imatra | 2005 |
| Untamo Invest Oy | Renko | 2022 |
| Unto Heinämäki Oy | Muurame | 1983 |
| Unto-Yhtiöt Oy | Helsinki | 2021 |
| Uoma Development Oy | Helsinki | 2025 |
| Uotila Invest Ab | Mariehamn | 2022 |
| Upila-Kiinteistöt Oy | Lahti | 2009 |
| Upinniemenranta Oy | Kauniainen | 2016 |
| Uplift Living Oy | Sulkava | 2024 |
| Uppalan Kartano Oy | Hyllykallio | 2006 |
| Uptown Douchebags Oy | Helsinki | 2015 |
| Upvest Oy | Kruunupyy | 2017 |
| Uranus-Kiinteistöt Oy | Helsinki | 2004 |
| Urapartners Oy | Helsinki | 2017 |
| Urasiilit Oy | Riihimäki | 2009 |
| Urban & Co. Oy | Turku | 2016 |
| Urban Cabin Oy | Tampere | 2021 |
| Urban Holding Oy | Helsinki | 2021 |
| Urban Holding Top Oy | Helsinki | 2022 |
| Urban Home Aleksi Oy | Helsinki | 2018 |
| Urban Partners Oy | Helsinki | 2023 |
| Urban Salt Oy | Helsinki | 1999 |
| Urban Trading Oy | Uusikaupunki | 2009 |
| UrbanLight Holding Oy | Helsinki | 2023 |
| UrbanLight Oy | Helsinki | 2024 |
| Urbanaani Oy | Raahe | 2008 |