| Glover & Sons Ltd | Households | 2025 |
| GMH Contracts Consultant Limited | Professional & scientific | 2023 |
| Godbold Blacksmiths Limited | Manufacturing | 2003 |
| Goel EP Limited | Professional & scientific | 2018 |
| Goldway Eclipse Limited | Mining & quarrying | 2013 |
| Goodchild Agri Limited | Professional & scientific | 2019 |
| Goodchild Units Limited | Administrative & support | 2025 |
| Goth Burger Ltd | Hospitality | 2025 |
| Graham Dale (Joinery) Limited | Construction | 2001 |
| Grangemuir Associates International Ltd | Wholesale & retail | 2021 |
| Grayserve Ltd | Professional & scientific | 2019 |
| Green END Electrical Ltd | Construction | 2022 |
| Greencroft Freehold Limited | Extraterritorial | 2020 |
| Greenhills Consultants Limited | Professional & scientific | 2025 |
| Greystones (Runswick Bay) Limited | Households | 2001 |
| Grosmont Crossing Club Limited | Arts & recreation | 1999 |
| Grosmont House Limited | Hospitality | 2015 |
| Grparuni Limited | Hospitality | 2014 |
| Grundy Hall Farm Limited | Professional & scientific | 2015 |
| GSM Tech Whitby Ltd | Wholesale & retail | 2026 |
| GUY Bentley Groundworks Limited | Construction | 2011 |
| GUY Bentley Limited | Construction | 1999 |
| H R Higgins Ltd | Wholesale & retail | 2024 |
| H2O Process Solutions Ltd | Water & waste | 2025 |
| Hall Farm Minerals (Whitby) Ltd | Financial services | 2013 |
| Hall Farm Minerals Ltd | Other services | 2012 |
| Hall Farm Warehousing Ltd | Real estate | 2020 |
| Hallam Properties (North East) Ltd | Real estate | 2025 |
| Hampsfell Developments Limited | Real estate | 1997 |
| Hapfield Properties Limited | Real estate | 1963 |
| Happy Days Centre (Whitby) Community Interest Company | Health & social care | 2017 |
| Harbour Lights Community Support Limited | Health & social care | 2022 |
| Harcourt's Rope Access Ltd | Manufacturing | 2025 |
| Harcourts Joinery & Renovations Limited | Manufacturing | 2020 |
| Hare & Sons Developments Ltd | Construction | 2025 |
| Hare Developments Limited | Construction | 1998 |
| Harland Bros (Tea Stall) Ltd | Hospitality | 2002 |
| Harrisons Garage (Whitby) Limited | Wholesale & retail | 2026 |
| Harvey Russell Electrical Ltd | Construction | 2026 |
| Hatton Psychology Ltd | Education | 2021 |
| Hawthorn Court (Whitby) Ltd | Households | 2015 |
| Healing With Lesley Ltd | Health & social care | 2024 |
| Health Therapy Massage Limited | Health & social care | 2026 |
| Heathercroft Cottage (RHB) Ltd | Hospitality | 2019 |
| Heatherdene, Goathland, Whitby Ltd | Hospitality | 2022 |
| Heidi Parsons Agencies Ltd | Wholesale & retail | 2015 |
| Hellcat Consulting Limited | Professional & scientific | 2013 |
| Hello Technology Ltd | Information & communication | 2024 |
| Henderson Property Services (Yorkshire) Limited | Real estate | 2015 |
| Hermitage Jewellery Limited | Arts & recreation | 2010 |
| High Quebec Minerals Ltd | Financial services | 2012 |
| Highcliffe Management Company Whitby Limited | Households | 1983 |
| Highfield Road Management Ltd | Real estate | 2025 |
| Hildegard House Management Company Limited | Extraterritorial | 2014 |
| Hippy Shake Limited | Wholesale & retail | 2022 |
| Hive Harrison Limited | Real estate | 2018 |
| HJL Properties (Sleights) Ltd | Agriculture & fishing | 2019 |
| HM Traders Europe Ltd | Wholesale & retail | 2025 |
| HMD Holidays Ltd | Real estate | 2026 |
| HMD Legal Ltd | Professional & scientific | 2020 |
| HMD Property Management Ltd | Real estate | 2023 |
| Hogarth Brothers Ltd | Agriculture & fishing | 2026 |
| Holden Capital Investments Limited | Real estate | 2017 |
| Holiday Cottages in Whitby Ltd | Hospitality | 2016 |
| Holidaypods Limited | Real estate | 2002 |
| Holly Lettings Ltd | Real estate | 2023 |
| Hollybush Minerals Ltd | Mining & quarrying | 2012 |
| Holmesdale Asset Management Limited | Extraterritorial | 2003 |
| Holywell Road Investments Ltd | Households | 2021 |
| Home From Home Yorkshire Limited | Hospitality | 2019 |
| Honeyz Bath Products Limited | Wholesale & retail | 2006 |
| Hope & Braim Estate Agents Limited | Real estate | 2020 |
| Hope Whitby CIC | Other services | 2024 |
| Horus Leisure Ltd | Hospitality | 2022 |
| Howarth Holdings (Whitby) Limited | Hospitality | 2025 |
| Hukin-Senior Limited | Hospitality | 2015 |
| Humble PIE N Mash (Whitby) Ltd | Hospitality | 2022 |
| Hume Electrical Services (Whitby) Limited | Construction | 2017 |
| Hunter Baker Properties Ltd | Real estate | 2024 |
| I-Stay Whitby Ltd | Hospitality | 2023 |
| IAN Ford Limited | Agriculture & fishing | 2003 |
| Icarus Global Ltd | Wholesale & retail | 2021 |
| Idalet Ltd | Real estate | 2025 |
| Ignite Concerts Limited | Arts & recreation | 2026 |
| IJE Plant Training Services Ltd | Administrative & support | 2017 |
| ING Properties Limited | Hospitality | 2007 |
| INK & Tide Publishing Ltd | Information & communication | 2026 |
| Integral Strength Ltd | Wholesale & retail | 2025 |
| Interconnect Engineering Limited | Mining & quarrying | 2024 |
| Itutu Properties Limited | Real estate | 2025 |
| IVY Construction Limited | Construction | 2013 |
| J & N Hansell Ltd | Transport & logistics | 2024 |
| J and a Ferns Limited | Hospitality | 2007 |
| J and S Kielty Limited | Hospitality | 2026 |
| J Foster Machinery Sales Ltd | Wholesale & retail | 2022 |
| J J Ferns Property Holdings Limited | Other services | 2025 |
| J P Roofing and Renovations Ltd | Construction | 2026 |
| J S L European Machinery Ltd. | Manufacturing | 1999 |
| J'Adore (Whitby) Limited | Wholesale & retail | 2009 |
| J. G. J. Little Limited | Real estate | 1963 |