| THE INTELLIGENT FOUNDRY LTD | 17391870 | Walsall | 10 August 2026 | Active |
| DELISSER WELDING SERVICES LTD | 17254712 | London | 1 June 2026 | Active |
| CPG CASTERS LIMITED | 16873479 | London | 25 November 2025 | Active |
| HOPEFUL INTL CO., LTD | 16713316 | Beckenham | 12 September 2025 | Active |
| EXCAVATE AM LTD | 16687328 | London | 1 September 2025 | Active |
| GLENMAR INDUSTRIES UK LTD | 16423907 | Solihull | 1 May 2025 | Active |
| UNITEDWAY HOLDINGS LTD. | 16332917 | London | 21 March 2025 | Active |
| CND RESOURCE LIMITED | 16029429 | Beckenham | 21 October 2024 | Active |
| VANGUARD 2024 LIMITED | 15990232 | Stourbridge | 1 October 2024 | Active |
| CEL-TEC METALWORKS LTD | SC814413 | Greenlaw | 24 June 2024 | Active |
| FORNACIS UK LIMITED | 15728236 | Telford | 18 May 2024 | Active |
| RAHA GROUP LTD | 15161246 | London | 25 September 2023 | Active |
| SWWI COMPOSITE, GATES & RAILINGS LIMITED | 15028202 | Maesteg | 25 July 2023 | Active |
| JIAOCHENG COUNTY XINXING CASTING CO., LTD | 14824390 | West Midlands | 24 April 2023 | Active |
| GRANGE IRON COMPANY LTD | 14729892 | Durham | 14 March 2023 | Active |
| ADVANCED UK INTERNATIONAL LTD | 14647667 | Worcester Park | 8 February 2023 | Active |
| DYC INTERNATIONAL LIMITED | 14638863 | Beckenham | 3 February 2023 | Active |
| HARLING FOUNDRIES LTD | 14518157 | Uckfield | 1 December 2022 | Active |
| CARTER AND DUCK BLACKSMITHS LTD | 14182184 | Stoneyhurst | 20 June 2022 | Active |
| LBI CASTINGS LTD | 13417937 | London | 25 May 2021 | Active |
| ACE METAL SUPPLIES LIMITED | 12591591 | Norwich | 7 May 2020 | Active |
| SHAKESPEARE CAST PRODUCTS LIMITED | 12540318 | Sunderland | 31 March 2020 | Active |
| THE LONDON BELL FOUNDRY LIMITED | 12473967 | Milton Keynes | 20 February 2020 | Active |
| ACE FABS LTD | 11864677 | Liverpool | 6 March 2019 | Active |
| SOUTH WALES WROUGHT IRONWORKS LTD | 11641352 | Maesteg | 24 October 2018 | Active - Proposal to Strike off |
| K & H HUDDERSFIELD LIMITED | 11328501 | Huddersfield | 25 April 2018 | Active |
| KCM CASTINGS LIMITED | 11318785 | Keighley | 19 April 2018 | Active |
| NWB INDUSTRIAL CO., LIMITED | 11148995 | London | 15 January 2018 | Active |
| CREATIVE IRONWORKS LIMITED | 11066183 | Ashford | 15 November 2017 | Active |
| ROCLIPS UK LTD | 10974728 | London | 21 September 2017 | Active |
| A.F.I.P. COMMERCIAL LTD | 10845525 | Colchester | 30 June 2017 | Not in the latest register snapshot (dissolved or removed) |
| CASTALLOY EUROPE LIMITED | 10418987 | Altrincham | 10 October 2016 | Active |
| CASTING SERVICES ENGINEERING LTD | 10396714 | Leicester | 27 September 2016 | Active |
| DUCTILE CASTINGS LIMITED | 10273615 | Brownhills | 12 July 2016 | Active |
| MUCHELNEY FORGE STUDIOS LIMITED | 09908692 | Langport | 9 December 2015 | Active - Proposal to Strike off |
| TSG UK SOLUTIONS LTD | SC517423 | Edinburgh | 7 October 2015 | Active |
| WANG & YAN LIMITED | 09575614 | Woodford Green | 5 May 2015 | Active |
| THOMAS DUDLEY FOUNDRY LIMITED | 09301505 | Dudley | 7 November 2014 | Active |
| TIMSONS ENGINEERING LIMITED | 09125170 | Kettering | 10 July 2014 | Active |
| SABINE BROTHERS (FOUNDRY) LIMITED | 09104536 | Swadlincote | 26 June 2014 | Active |
| BALLANTINE CASTINGS LTD. | SC471288 | Glasgow | 28 February 2014 | Liquidation |
| COUPE CASTINGS LIMITED | 08875579 | Manchester | 4 February 2014 | Liquidation |
| MID BEDS LOCKSMITHS LIMITED | 08629333 | Biggleswade | 29 July 2013 | Active |
| NEAL TREDINNICK LIMITED | 08563117 | Waltham Abbey | 10 June 2013 | Active - Proposal to Strike off |
| AATI RAIL LIMITED | 08183811 | Braintree | 17 August 2012 | Active |
| PROGRESS RAIL SERVICES UK LIMITED | 07545889 | Nottingham | 28 February 2011 | Active |
| ORIGIN ALLOY LIMITED | 07511298 | Sunderland | 31 January 2011 | Active |
| THOMAS HARRAL METALSMITHS LIMITED | 07218699 | Taunton | 9 April 2010 | Active |
| SURFACE FINISHING EQUIPMENT GROUP LIMITED | 06948768 | Sheffield | 30 June 2009 | Active |
| SIL ENTERPRISES LIMITED | 06834823 | West Bromwich | 3 March 2009 | Active |