| Heikkinen & Puljula Oy | Administrative & support | 1990 |
| Heli Oulu Oy | Transport & logistics | 2022 |
| Heli Rovaniemi Oy | Transport & logistics | 2022 |
| Heli Ylivieska Oy | Transport & logistics | 2026 |
| Helmiasunnot Oy | Real estate | 2016 |
| Helmikodit Oy | Real estate | 1990 |
| Helposti Netistä Oy | Wholesale & retail | 2022 |
| Helsingin JSK-Liiketilat Oy | Real estate | 1996 |
| Hengähdä Oy | Administrative & support | 2022 |
| Henkari Second Hand Oy | Wholesale & retail | 2025 |
| Henna Rinne Oy | Wholesale & retail | 2016 |
| Henri & Ellinoora Oy | Administrative & support | 2016 |
| Herajärvi Car Center Oy | Wholesale & retail | 1994 |
| Herkkubasaari Oy | Wholesale & retail | 2021 |
| Herkkumaja Ky | Wholesale & retail | 2008 |
| Hernesaaren Kartum Oy | Administrative & support | 2010 |
| Hessuntori Oy | Wholesale & retail | 1980 |
| Heteaapa Oy Ab | Manufacturing | 2024 |
| Hidden Forest Oy | Hospitality | 2025 |
| Hilla House Oy | Hospitality | 2017 |
| HillaKeittiöt Oy | Wholesale & retail | 1999 |
| Hirvi Huoneistot Oy | Hospitality | 2025 |
| Hitsaamo V.Härkönen Ky | Manufacturing | 1991 |
| Hk konehuolto ja hitsaus Oy | Manufacturing | 2018 |
| Hoiva Lapitar Oy | Health & social care | 2025 |
| Hoiva Taiga Oy | Health & social care | 2016 |
| Hoivapalvelukeskus Hoiva Villa Oy | Health & social care | 2014 |
| Honkavuori Experiences Oy | Education | 2024 |
| Hopeakodit Oy | Real estate | 2005 |
| Hopeasampo Ky | Manufacturing | 1988 |
| Horse Hill Oy | Education | 2007 |
| Host It Oy | Hospitality | 2023 |
| Hosted by Hoisko Oy | Hospitality | 2023 |
| Hostel Tikka Oy | Hospitality | 2018 |
| Hotel Santa Claus Oy | Hospitality | 2000 |
| Hotelli Aakenus Oy | Hospitality | 1986 |
| House of Kumpula Oy | Information & communication | 2025 |
| House pizzeria oy | Hospitality | 2024 |
| Hovin Turvapalvelu avoin yhtiö | Administrative & support | 2008 |
| Huilailevi Oy | Administrative & support | 1998 |
| Huippu services oy | Other services | 2024 |
| Hunaja Holding Oy | Professional & scientific | 2016 |
| Hungry For Lapland Oy | Manufacturing | 2020 |
| Huolto Salmet Oy | Other services | 2014 |
| Huoltopalvelut Aalto Oy | Administrative & support | 2022 |
| Husky World Oy | Administrative & support | 2023 |
| Hygge Host Oy | Hospitality | 2023 |
| Hysse Oy | Wholesale & retail | 2020 |
| I Am Your Productions Oy | Arts & recreation | 2023 |
| I. S. Kivistö, Miesten Pukimo Ky | Wholesale & retail | 1949 |
| ICE ROAD Oy | Administrative & support | 2020 |
| ILCAN Oy | Information & communication | 2008 |
| INFI Cafe Oy | Hospitality | 2025 |
| ISA-Yhtiö Oy | Construction | 2022 |
| Isben Hius-Ja Meikkistudio OY | Other services | 2013 |
| ITC Holding Oy | Information & communication | 1997 |
| Itäkairan Elämys & Palvelu OY | Arts & recreation | 2021 |
| Ibedcity Oy | Administrative & support | 2017 |
| Icestella Oy | Agriculture & fishing | 1996 |
| Ideatikki Oy | Construction | 1993 |
| Ihmemiehet Oy | Professional & scientific | 2008 |
| Ikigai Events Oy | Professional & scientific | 2018 |
| Illi-flow Oy | Administrative & support | 2026 |
| Ilmolan Kartano Oy | Hospitality | 2017 |
| InKo Invest Oy | Hospitality | 2024 |
| Inapat Oy | Professional & scientific | 2018 |
| Inaritalot Oy | Construction | 2014 |
| Infke Oy | Professional & scientific | 2023 |
| InfraStyle Oy | Professional & scientific | 2025 |
| Infrain Oy | Construction | 2026 |
| Infrainvest Oy | Administrative & support | 2020 |
| Inframestarit Oy | Construction | 2023 |
| Infrapalvelu HJY Oy | Construction | 2025 |
| Inget Consulting Oy | Financial services | 2019 |
| Inner Aurora Oy | Hospitality | 2026 |
| InnoRakennus Oy | Professional & scientific | 2020 |
| Innorova Oy | Professional & scientific | 2016 |
| Innovadea Oy | Professional & scientific | 2025 |
| InsRova Oy | Professional & scientific | 2022 |
| Inside Kiinteistöt Oy | Real estate | 2012 |
| Insinööritoimisto Airaksinen Ky | Professional & scientific | 1986 |
| Insinööritoimisto Airax Oy | Professional & scientific | 2015 |
| Insinööritoimisto Angelva Oy | Information & communication | 2017 |
| Insinööritoimisto Ari Viippola Ky | Professional & scientific | 2012 |
| Insinööritoimisto Eero Saarijärvi Oy | Construction | 1997 |
| Insinööritoimisto Flygare Oy | Professional & scientific | 1995 |
| Insinööritoimisto Hyvönen Oy | Construction | 2020 |
| Insinööritoimisto J. A. Karjalainen Oy | Professional & scientific | 2011 |
| Insinööritoimisto J. Lampela Oy | Professional & scientific | 2001 |
| Insinööritoimisto Jori Harjuniemi Oy | Construction | 2007 |
| Insinööritoimisto Kotaolli Oy | Real estate | 2014 |
| Insinööritoimisto LampöKattelus Oy | Professional & scientific | 2019 |
| Insinööritoimisto Lapikas Oy | Professional & scientific | 2010 |
| Insinööritoimisto Lappialämpö Oy | Professional & scientific | 2001 |
| Insinööritoimisto Luusua Oy | Construction | 2026 |
| Insinööritoimisto Matti Vaarala Oy | Construction | 1995 |
| Insinööritoimisto Narako Oy | Professional & scientific | 2022 |
| Insinööritoimisto Nikka Oy | Professional & scientific | 2014 |
| Insinööritoimisto Pekka Alatalo Oy | Professional & scientific | 2019 |
| Insinööritoimisto Pekka Mölläri Oy | Real estate | 2022 |