| 11:FS Investments Ltd | London | 2024 |
| 11ALL Investments Ltd | Bristol | 2021 |
| 11CHURTON Ltd | London | 2022 |
| 11ELEVEN Holdings Ltd | Swansea | 2025 |
| 11PCS Property Management Limited | Bury St. Edmunds | 2024 |
| 11S Capital Limited | Ingatestone | 2022 |
| 11TEN Limited | Sutton Coldfield | 2022 |
| 11TH Avenue Limited | London | 2020 |
| 11WC Limited | Edinburgh | 2024 |
| 12 Armadillos Limited | Dunbar | 2025 |
| 12 Capital Investments Limited | Ashford | 2023 |
| 12 Clifton Park Limited | Milton Keynes | 2020 |
| 12 Diamonds Estates Ltd | Birmingham | 2026 |
| 12 Elements Ltd | London | 2024 |
| 12 Finance Limited | Woking | 2012 |
| 12 Flags Global Limited | London | 2025 |
| 12 Sea Limited | Newtownards | 2023 |
| 12 Trees Holdings Limited | Loughton | 2023 |
| 120B New Acton Lane Limited | London | 2015 |
| 121 Advisory Ltd | London | 2016 |
| 121 Capital Limited | London | 2018 |
| 121 Financial One Ltd | Darlington | 2002 |
| 121 Payroll Services Ltd | Sittingbourne | 2023 |
| 121-ADVICE Ltd | Taunton | 2008 |
| 1210 Group Ltd | Radstock | 2025 |
| 1210 Holdings Ltd | London | 2020 |
| 1212 Group Limited | Derby | 2023 |
| 1215 Holdings Ltd | Crediton | 2025 |
| 122 Holdings Limited | Newark | 2024 |
| 1221 Holdings Ltd | Solihull | 2022 |
| 12257721 Limited | Bournemouth | 2019 |
| 12287921 Limited | London | 2019 |
| 123 RD Limited | Glasgow | 2021 |
| 123 AG Limited | Glasgow | 2021 |
| 123 Business Services Ltd | Romsey | 2011 |
| 123 Collections Limited | Harrow | 2023 |
| 123 Financial Services Limited | Quorn | 2013 |
| 123 RG Limited | Glasgow | 2021 |
| 123 TP Limited | Glasgow | 2021 |
| 123 UG Limited | Glasgow | 2021 |
| 123-WEALTH Limited | Warrington | 2026 |
| 123456 Limited | Manchester | 2025 |
| 123456 TEE Limited | Manchester | 2025 |
| 124 Victoria Rise Limited | London | 2024 |
| 1244 Holdings Limited | Whetstone | 2026 |
| 1248 Limited | Tiverton | 2023 |
| 125 High Street, Hungerford Ltd | Hitchin | 2024 |
| 125 Insight Group Ltd | Harrow | 2024 |
| 125-133 London Road Ltd | London | 2023 |
| 1260 Family Holdings Limited | Leatherhead, Surrey | 2025 |
| 127 Holding Ltd | Wirral | 2023 |
| 128 Assets Ltd | Liverpool | 2025 |
| 128 Barrack Street Limited | Norwich | 2026 |
| 129 Holdings Ltd | Clevedon | 2025 |
| 129 Kadamtala Global Ltd | Eastleigh | 2020 |
| 1291 Group UK Ltd. | London | 2002 |
| 12954670 Ltd | Chichester | 2020 |
| 12AM Capital Ltd | Brierley Hill | 2007 |
| 12DW Property Group Ltd | Calne | 2024 |
| 12KNOW Limited | Walsall | 2022 |
| 12TH GEN Limited | Lincoln | 2025 |
| 12TH Legacy Limited | Benfleet | 2021 |
| 13 13 Investments Limited | Uxbridge | 2018 |
| 13 Amethysts Group Holdings Limited | Thame | 2025 |
| 13 Capital Group Limited | London | 2026 |
| 13 Capital Management Limited | London | 2025 |
| 13 Investment Management Limited | London | 2025 |
| 13 Investments Ltd | London | 2023 |
| 13 South Ltd | Falmouth | 2023 |
| 13 Wealth Management Ltd | Leicester | 2024 |
| 130 Wood Street (NO.1) Limited | London | 2020 |
| 130 Wood Street (NO.2) Limited | London | 2020 |
| 13042524 Ltd | Cardiff | 2020 |
| 1313 Ventures Ltd | Slough | 2024 |
| 1314 Capital Advisors GP Limited | London | 2023 |
| 132 Beach Road Limited | Billingham | 2019 |
| 1337 Investments Ltd | Clitheroe | 2021 |
| 134 Holdings Limited | Stoke On Trent | 2021 |
| 134A/B High Street Tenterden Limited | Tenterden | 2007 |
| 137.FINANCE Ltd | London | 2025 |
| 1373 Holdings Ltd | Hamilton | 2024 |
| 139 Holdings Ltd | London | 2025 |
| 13BOOKS Capital Founder Partner 1 Limited | London | 2019 |
| 13BOOKS Capital Founder Partner 2 Limited | Edinburgh | 2019 |
| 13BOOKS Capital II Founder Partner 1 Limited | London | 2022 |
| 13BOOKS Capital II Founder Partner 2 Limited | Edinburgh | 2022 |
| 13BOOKS Capital III Founder Partner 1 Limited | London | 2026 |
| 13BOOKS Capital III Founder Partner 2 Limited | Edinburgh | 2026 |
| 13L Holdings Limited | Southend On Sea | 2024 |
| 13SC Holdings Limited | London | 2025 |
| 14 Bond Street Limited | Towcester | 2024 |
| 14 Group Limited | London | 2023 |
| 14 Investors Group Ltd | Oldbury | 2025 |
| 14 Millar Holdings Ltd | Watford | 2022 |
| 14 Patcham Terrace Ltd | Croydon | 2025 |
| 140 Oxford Road Limited | Kidlington | 2018 |
| 1401 Capital Limited | Manchester | 2018 |
| 140795 Ltd | Ipswich | 2025 |
| 141 Holdings Ltd | London | 2019 |
| 141516 Ltd | Derby | 2015 |