| Happiness Corp Education Limited | London | 2023 |
| Happiness for ALL CIC | London | 2023 |
| Happiness Hack Ltd | London | 2021 |
| Happiness Outdoors Project CIC | Exeter | 2024 |
| Happiness Rises Ltd | London | 2020 |
| Happistuff Limited | Glasgow | 2015 |
| Happitime Playgroup Ltd | London | 2010 |
| Happy and Freedom C.I.C. | Birmingham | 2023 |
| Happy Bears Childcare Ltd | Malmesbury | 2026 |
| Happy Bunnies Pre-School(Southampton) | Southampton | 2007 |
| Happy Camel CIC | Plymouth | 2023 |
| Happy Campers Club Ltd | London | 2023 |
| Happy Chatters Limited | Stanmore | 2019 |
| Happy Chatty Speech Therapy Ltd | Rickmansworth | 2022 |
| Happy Child (Mottingham) Limited | Burntwood | 2008 |
| Happy Child Limited | Burntwood | 1997 |
| Happy Childcare Ltd | Salford | 2021 |
| Happy Childhood Ltd | Barnet | 2017 |
| Happy Children Ltd | Liverpool | 2012 |
| Happy Choo Choo Nursery Ltd | London | 2016 |
| Happy Confident Foundation CIC | London | 2026 |
| Happy Confident Kids Limited | Kenilworth | 2023 |
| Happy Corner Bethnal CIC | London | 2026 |
| Happy Cosleeper Ltd | London | 2024 |
| Happy Crafter Ltd | Tamworth | 2025 |
| Happy Cuppa Ltd | London | 2025 |
| Happy Days (1999) Limited | | 1999 |
| Happy Days (2000) Limited | Conlig | 2003 |
| Happy Days (2001) Limited | Conlig | 2003 |
| Happy Days Childcare Services Ltd | Nottingham | 2016 |
| Happy Days Club & Nursery School Limited | Holmes Chapel | 2010 |
| Happy Days Consultancy Limited | Newquay | 2002 |
| Happy Days Day Nurseries Limited | Newquay | 2001 |
| Happy Days Employment Academy Community Interest Company | Tranent | 2024 |
| Happy Days Kindergarten Ltd | Beckenham | 2017 |
| Happy Days Learning Kitchen CIC | Skelmersdale | 2022 |
| Happy Days Montessori Ltd | Wembley | 1998 |
| Happy Days Nursery (Orton RD) Ltd | Manchester | 2017 |
| Happy Days Nursery (Rayleigh) Limited | Rayleigh | 2016 |
| Happy Days Nursery Limited | Birmingham | 2002 |
| Happy Days Pre-School Ltd | Harrow | 2008 |
| Happy Days South West Limited | Newquay | 2003 |
| Happy Dayz Nursery Limited | Mountain Ash | 2011 |
| Happy ED Ltd | Wirral | 2020 |
| Happy Education Consultancy Ltd | London | 2018 |
| Happy Education Limited | Cardiff | 2026 |
| Happy Educational Consultancy Ltd | Birmingham | 2020 |
| Happy English UK Ltd | Hollinwood | 2018 |
| Happy Faces Nursery Ltd | Southend-On-Sea | 2026 |
| Happy Faces Pre-School Limited | Tonbridge | 2004 |
| Happy Families Child Care Limited | Bridgnorth | 2006 |
| Happy Feet Childcare Ltd | Chippenham | 2024 |
| Happy Feet Day Nursery Acton Ltd | London | 2017 |
| Happy Feet Day Nursery Limited | Salford | 2015 |
| Happy Feet Nursery & Preschool (Westbourne) Ltd | Poole | 2024 |
| Happy Feet Song & Dance Company Limited | Reigate | 2010 |
| Happy Feetball Ltd | London | 2025 |
| Happy FUN Ltd | London | 2012 |
| Happy Hands 102 Ltd | London | 2024 |
| Happy Hands Childcare Limited | Kettering | 2018 |
| Happy Hands Ltd | Northampton | 2009 |
| Happy Headwork Ltd | Swansea | 2025 |
| Happy Healthy Together CIC | Barrow-In-Furness | 2024 |
| Happy Hearts Day Nursery Ltd | Southampton | 2011 |
| Happy Hearts Learning Ltd | Derby | 2025 |
| Happy Hedgehogs Ltd | Swadlincote | 2019 |
| Happy Hedgehogs Nursery Ltd | Leicester | 2025 |
| Happy Hive Club Ltd | London | 2025 |
| Happy Home Coaching Ltd | St. Albans | 2015 |
| Happy Home Solutions Ltd | Waltham Cross | 2022 |
| Happy Hoofbeats Theraponies Ltd | Broxburn | 2024 |
| Happy Hooves Happy Hearts CIC | Birmingham | 2025 |
| Happy Horsemanship Ltd | Aboyne | 2023 |
| Happy Hounds of Newport Ltd | Newport | 2024 |
| Happy Hours Childcare Services Ltd | Stoke On Trent | 2024 |
| Happy Hours Private Day Nursery Ltd | Wigan | 2009 |
| Happy Hub Ltd | London | 2025 |
| Happy Human Project Ltd | St. Albans | 2022 |
| Happy in School Project C.I.C. | Hampton | 2025 |
| Happy Kids (Yorkshire) Limited | Sheffield | 2013 |
| Happy Kids Childcare Limited | Sheffield | 2012 |
| Happy Kids Day Care Limited | Armagh | 2016 |
| Happy Kids Education Centre Ltd | Cheltenham | 2017 |
| Happy Kids Face Limited | Twickenham Green | 2016 |
| Happy Kids INK Ltd | Seven Kings | 2021 |
| Happy Language School Limited | London | 2011 |
| Happy Learner Academy Limited | Folkestone | 2025 |
| Happy Learners Day Nursery Ltd | Worthing | 2022 |
| Happy Learning Ltd | Rochdale | 2025 |
| Happy Little Angels Day Nursery Limited | Croydon | 2018 |
| Happy Little Bunny (II) Ltd | London | 2012 |
| Happy Little Hearts Daycare Ltd | Fareham | 2025 |
| Happy Little Hearts Ltd | Leicester | 2017 |
| Happy Little Humans Ltd. | Newport | 2024 |
| Happy Little People Ltd | Glasgow | 2016 |
| Happy Little Sweethearts Ltd | Leicester | 2020 |
| Happy Littles Play Company Ltd | Newtownabbey | 2023 |
| Happy Mama Hub Limited | Huntingdon | 2022 |
| Happy Mandarin Ltd | Surbiton | 2019 |
| Happy ME Dance Ltd | London | 2020 |