| Helsinki Capital Partners Advisory Oy | Professional & scientific | 2009 |
| Helsinki Capital Partners Group Oy | Financial services | 2009 |
| Helsinki Capital Partners Oy | Financial services | 2007 |
| Helsinki Car Company Oy | Wholesale & retail | 2020 |
| Helsinki Casting & Blockbusters Gang Oy | Arts & recreation | 2017 |
| Helsinki Comedy Oy | Arts & recreation | 2009 |
| Helsinki Concierge Oy | Administrative & support | 2016 |
| Helsinki Construction Catering Oy | Hospitality | 2024 |
| Helsinki Consulting AKB Oy | Professional & scientific | 2019 |
| Helsinki Contemporary Oy | Wholesale & retail | 2007 |
| Helsinki Core Trainers Oy | Arts & recreation | 2011 |
| Helsinki Cross Media Production Oy | Professional & scientific | 1995 |
| Helsinki Cup Oy | Arts & recreation | 2008 |
| Helsinki Custom Builders Oy | Construction | 2016 |
| Helsinki Customs Oy | Other services | 2021 |
| Helsinki Day Spa Oy | Other services | 2024 |
| Helsinki Design Brewery Oy | Professional & scientific | 2018 |
| Helsinki Design Company Oy | Professional & scientific | 2016 |
| Helsinki Design School Oy | Education | 1996 |
| Helsinki Digitary Oy | Professional & scientific | 2021 |
| Helsinki East City Gym Oy | Arts & recreation | 2020 |
| Helsinki Economics Oy | Professional & scientific | 2009 |
| Helsinki Estate Oy | Financial services | 2008 |
| Helsinki Factory Oy | Financial services | 2020 |
| Helsinki Film & Gear Oy | Other services | 2024 |
| Helsinki Firdonkatu Centre Oy | Real estate | 2018 |
| Helsinki First Aid Oy | Education | 2016 |
| Helsinki Food Bros Oy | Wholesale & retail | 2020 |
| Helsinki Food Week Oy | Professional & scientific | 2019 |
| Helsinki Foodstock Oy | Wholesale & retail | 1999 |
| Helsinki Gallery Archive Oy | Wholesale & retail | 2025 |
| Helsinki Gift Shop Oy | Wholesale & retail | 2013 |
| Helsinki Graphics Oy | Information & communication | 2016 |
| Helsinki Group Oy | Hospitality | 2020 |
| Helsinki Hair Salon Oy | Other services | 2024 |
| Helsinki Half Marathon Oy | Arts & recreation | 2013 |
| Helsinki Holding Company Oy | Information & communication | 2014 |
| Helsinki Home 4 You Oy | Wholesale & retail | 2007 |
| Helsinki Human Pro Oy | Administrative & support | 2018 |
| Helsinki Identity Oy | Information & communication | 2021 |
| Helsinki Immaterial Oy | Administrative & support | 2015 |
| Helsinki Impact Oy | Information & communication | 2023 |
| Helsinki Inlet Oy | Professional & scientific | 2013 |
| Helsinki International Performing Arts Center Oy | Education | 2025 |
| Helsinki International Schools Group Oy | Education | 2015 |
| Helsinki Intuition Oy | Information & communication | 2023 |
| Helsinki Investment Trust Oy | Financial services | 1984 |
| Helsinki Jaakonkatu Centre Oy | Real estate | 2014 |
| Helsinki Juniors FC Oy | Arts & recreation | 2024 |
| Helsinki Kumpulantie Centre Oy | Real estate | 2018 |
| Helsinki LKV Oy | Real estate | 2008 |
| Helsinki Laivakatu Real Estate Oy | Real estate | 2023 |
| Helsinki Laundry Club Oy | Other services | 2021 |
| Helsinki Lighting Design Company Oy | Wholesale & retail | 1995 |
| Helsinki Line Dancers Oy | Arts & recreation | 2025 |
| Helsinki Lines Oy | Transport & logistics | 1991 |
| Helsinki Literary Agency Oy | Information & communication | 2017 |
| Helsinki Management Company Oy | Professional & scientific | 2024 |
| Helsinki Marathon Oy | Arts & recreation | 2017 |
| Helsinki Marketing Summit Oy | Administrative & support | 2026 |
| Helsinki Medical Consulting Oy | Health & social care | 2011 |
| Helsinki Mega & Large Buyout Club 2021 Oy | Professional & scientific | 2021 |
| Helsinki Metropolitan Taksi Oy | Transport & logistics | 2019 |
| Helsinki Mind Oy | Professional & scientific | 2022 |
| Helsinki Motorparking Oy | Real estate | 1985 |
| Helsinki Music Week Oy | Arts & recreation | 2025 |
| Helsinki Object Archive Oy | Wholesale & retail | 2025 |
| Helsinki Odyssey Oy | Transport & logistics | 2024 |
| Helsinki Optical Oy | Wholesale & retail | 2020 |
| Helsinki Oriental Dance Studio Oy | Arts & recreation | 2018 |
| Helsinki Outlet Operation Oy | Professional & scientific | 2019 |
| Helsinki Outlet Oy | Professional & scientific | 2015 |
| Helsinki Partners Oy | Professional & scientific | 2021 |
| Helsinki Plastic Surgery & Dermatology Oy | Health & social care | 2022 |
| Helsinki Playground Oy | Professional & scientific | 2024 |
| Helsinki Point Oy | Professional & scientific | 2008 |
| Helsinki Port Service Oy | Transport & logistics | 2013 |
| Helsinki Posters Oy | Wholesale & retail | 2020 |
| Helsinki Print & Retail Oy | Information & communication | 2018 |
| Helsinki Private Equity Club Oy | Professional & scientific | 2020 |
| Helsinki Pro Audio Oy | Professional & scientific | 2000 |
| Helsinki Promo Oy | Professional & scientific | 2009 |
| Helsinki Public Ky | Professional & scientific | 2014 |
| Helsinki Pump Production Oy | Information & communication | 2008 |
| Helsinki Rental Company Oy | Administrative & support | 2025 |
| Helsinki Rigging Company Oy | Professional & scientific | 2012 |
| Helsinki SY Acquisition Company Oy | Manufacturing | 2022 |
| Helsinki Sales Academy Oy | Professional & scientific | 2017 |
| Helsinki Salonki - Sinulle Oy | Other services | 2025 |
| Helsinki Salsa Academy Oy | Arts & recreation | 2021 |
| Helsinki School of Business AB, Suomen sivuliike | Education | 2018 |
| Helsinki Seagulls Oy | Arts & recreation | 2025 |
| Helsinki Securities Oy | Financial services | 1971 |
| Helsinki Sport Investment Oy | Arts & recreation | 2004 |
| Helsinki Stadion Management Oy | Arts & recreation | 1999 |
| Helsinki Steel Oy | Administrative & support | 2008 |
| Helsinki Surgical Instruments ab | Manufacturing | 2017 |
| Helsinki Syndrome Oy | Information & communication | 2013 |
| Helsinki Taxi Service Oy | Transport & logistics | 2019 |
| Helsinki Tiepalvelu Oy | Transport & logistics | 2025 |