| 1 | MKS Spectra Holdings Limited Crewe Turnover £0 | £783.3M 2020 accounts | £0 |
| 2 | HMD Seal/less Pumps Limited Eastbourne | £446.1M 2024 accounts | — |
| 3 | Meritor Holdings UK Ltd. Cwmbran | £320.1M | — |
| 4 | Gordon Murray Automotive Limited Guildford | £296.9M 2023 accounts | — |
| 5 | Energizer Trading Limited High Wycombe Turnover £339.2M | £204.6M | £339.2M |
| 6 | Wanfeng MLTH Holdings Co., Ltd Sutton-In-Ashfield Turnover £0 | £180.3M 2024 accounts | £0 |
| 7 | G-Tekt Europe Manufacturing Limited Gloucester Turnover £135.2M | £127.8M | £135.2M |
| 8 | Cicor UK Ltd Milton Keynes | £109.7M | — |
| 9 | Energizer Europe Limited Bucks | £107.0M | — |
| 10 | Southco Manufacturing Limited Worcester Turnover £95.7M | £96.5M 2024 accounts | £95.7M |
| 11 | Econ Engineering Limited Evesham Turnover £58.3M | £95.6M 2025 accounts | £58.3M |
| 12 | Bamford Bus Company Limited Oxford Turnover £455.1M | £90.1M | £455.1M |
| 13 | Xtrac Limited Thatcham Turnover £45.9M | £82.1M 2020 accounts | £45.9M |
| 14 | Protec Fire Detection Public Limited Company Lomeshaye Ind Est Turnover £109.4M | £75.7M 2022 accounts | £109.4M |
| 15 | J & D Pierce (Contracts) Ltd. Ayrshire | £73.8M 2023 accounts | — |
| 16 | MB Aerospace Newton Abbot Limited London | £73.5M 2024 accounts | — |
| 17 | R K Wholesale Limited Stoke On Trent | £73.4M | — |
| 18 | Binks U.K. Limited Dorset Turnover £75.7M | £68.3M 2022 accounts | £75.7M |
| 19 | W B Power Services Limited Heanor Turnover £131.4M | £67.9M | £131.4M |
| 20 | Allied Vehicles Limited Lanarkshire Turnover £312.8M | £60.7M | £312.8M |
| 21 | Hepco Slide Systems Limited London Turnover £44.4M | £57.3M 2024 accounts | £44.4M |
| 22 | Plexus Corp (UK) Limited Roxburghshire | £56.0M | — |
| 23 | Allam Power Limited Hull Turnover £43.8M | £53.8M 2024 accounts | £43.8M |
| 24 | Willerby Limited Hull Turnover £110.3M | £53.7M | £110.3M |
| 25 | Rotolok (Holdings) Limited Tiverton | £53.6M | — |
| 26 | Ifor Williams Trailers Limited Manchester Turnover £83.5M | £49.5M | £83.5M |
| 27 | Electroimpact UK Limited Deeside | £47.8M 2024 accounts | — |
| 28 | Auto-Sleepers Group Limited Broadway Turnover £123.8M | £47.4M | £123.8M |
| 29 | Thwaites Limited Leamington Spa | £47.3M | — |
| 30 | Kirintec Limited Ross-On-Wye | £47.0M 2023 accounts | — |
| 31 | Nov Process & Flow Technologies UK Limited Stonehouse Turnover £62.5M | £46.9M | £62.5M |
| 32 | Flexitallic UK Ltd Cleckheaton Turnover £37.1M | £46.0M 2024 accounts | £37.1M |
| 33 | TBS Engineering Limited Cheltenham Turnover £55.0M | £45.3M | £55.0M |
| 34 | Sonardyne International Limited Yateley | £42.6M 2023 accounts | — |
| 35 | Truck-Lite Europe Limited Essex | £41.3M | — |
| 36 | McConnel Limited Evesham | £38.2M 2024 accounts | — |
| 37 | Paxton Access Limited East Sussex | £38.1M | — |
| 38 | Don-Bur (Bodies and Trailers) Limited Longton | £37.5M | — |
| 39 | Independent Tool Consultants Limited Staverton Cheltenham | £37.3M | — |
| 40 | Octric Semiconductors Limited Newcastle Upon Tyne | £37.0M | — |
| 41 | KMG Systems Limited Sandy Turnover £37.2M | £36.8M | £37.2M |
| 42 | Atlas Copco Ias UK Limited Flintshire Turnover £43.1M | £36.8M 2024 accounts | £43.1M |
| 43 | Bühler UK Limited Turnover £84.9M | £35.3M 2019 accounts | £84.9M |
| 44 | Krohne Limited Wellingborough | £34.2M 2024 accounts | — |
| 45 | Merlin Diesel Systems Ltd Preston Turnover £64.3M | £34.2M | £64.3M |
| 46 | Domo Tactical Communications (DTC) Limited Whiteley Turnover £72.9M | £33.6M | £72.9M |
| 47 | Garic Limited Liverpool Turnover £37.4M | £33.6M 2022 accounts | £37.4M |
| 48 | Wilson Power Solutions Limited Leeds Turnover £85.9M | £33.3M | £85.9M |
| 49 | Norbar Torque Tools Limited Banbury Turnover £40.6M | £33.1M 2024 accounts | £40.6M |
| 50 | Marshall Amplification PLC Bletchley | £31.8M | — |
| 51 | Idem Safety Switches Limited Wigan | £31.5M | — |
| 52 | Oticon Limited Birmingham | £31.3M 2024 accounts | — |
| 53 | VPG Systems UK Limited Bradford Turnover £11.5M | £31.1M 2021 accounts | £11.5M |
| 54 | Sem Limited Dartford Turnover £17.8M | £30.7M 2024 accounts | £17.8M |
| 55 | Wec Group Limited Darwen Turnover £50.0M | £29.6M 2024 accounts | £50.0M |
| 56 | Coperion UK Limited Peterborough Turnover £40.5M | £29.0M | £40.5M |
| 57 | Magicard Ltd Weymouth Turnover £19.8M | £28.8M | £19.8M |
| 58 | MB Aerospace Limited Glasgow | £28.8M 2024 accounts | — |
| 59 | Logisnext UK Limited Oxfordshire | £27.8M | — |
| 60 | Frank H.Dale Limited Leominster | £27.4M | — |
| 61 | Independent Forgings & Alloys Limited Sheffield | £27.2M | — |
| 62 | Alphasense Limited Leicester | £27.0M 2021 accounts | — |
| 63 | Caunton Engineering Limited Nottingham | £26.6M 2025 accounts | — |
| 64 | Clas-Sic Wafer Fab Limited Lochgelly | £26.4M 2023 accounts | — |
| 65 | Bott Limited Bude Turnover £56.0M | £26.4M | £56.0M |
| 66 | Al-Ko Kober Limited Southam Turnover £60.1M | £26.4M 2024 accounts | £60.1M |
| 67 | Sungrow Power UK Limited Milton Keynes | £26.1M | — |
| 68 | MPRD Limited Buckinghamshire Turnover £51.3M | £26.1M 2023 accounts | £51.3M |
| 69 | MKS Instruments UK Limited Crewe Turnover £40.2M | £25.8M 2020 accounts | £40.2M |
| 70 | Chester Hall Precision Engineering Limited London | £25.3M 2024 accounts | — |
| 71 | Walsall Pressings Company Limited Walsall Turnover £47.3M | £25.2M 2025 accounts | £47.3M |
| 72 | Swarco UK & Ireland Ltd Basingstoke Turnover £90.9M | £25.1M 2024 accounts | £90.9M |
| 73 | Blackwood Engineering Limited Gwent | £25.1M 2023 accounts | — |
| 74 | Techtest Limited Leominster Turnover £33.4M | £25.1M 2025 accounts | £33.4M |
| 75 | Reflexallen UK Limited Bodelwyddan Turnover £52.3M | £24.8M 2022 accounts | £52.3M |
| 76 | Mills CNC Limited Leamington Spa Turnover £62.0M | £24.8M | £62.0M |
| 77 | Supacat Limited Devon | £24.7M | — |
| 78 | Macduff Shipyards Limited | £24.7M 2024 accounts | — |
| 79 | ZND (UK) Limited Rotherham | £24.2M | — |
| 80 | Bomford Turner Limited Evesham | £24.2M 2024 accounts | — |
| 81 | I. W. T. Deeside Limited Manchester Turnover £40.0M | £23.9M | £40.0M |
| 82 | Radicon Transmission UK Limited Elland | £23.9M | — |
| 83 | Huber + Suhner (UK) Limited Oxon Turnover £76.3M | £23.8M | £76.3M |
| 84 | Coilcraft Europe Limited Glasgow | £23.6M | — |
| 85 | Hospital Metalcraft Limited Dorset Turnover £24.9M | £23.5M 2023 accounts | £24.9M |
| 86 | Hydac Technology Limited Buckinghamshire | £23.4M | — |
| 87 | Rega Research Limited Southend-On-Sea | £23.3M | — |
| 88 | Envirovent Limited Harrogate | £23.3M | — |
| 89 | Albright International Limited Whitchurch Turnover £35.4M | £23.3M | £35.4M |
| 90 | Tornado Wire Limited Perthshire Turnover £30.3M | £23.1M 2024 accounts | £30.3M |
| 91 | PCS Instruments Limited London Turnover £11.0M | £23.0M | £11.0M |
| 92 | Lawrence David Limited Peterborough | £23.0M | — |
| 93 | Helical Technology Ltd. Lytham | £22.8M 2024 accounts | — |
| 94 | Quality Hydraulic Power Limited Halifax | £22.8M | — |
| 95 | Howat Group PLC Dearne Valley | £22.7M | — |
| 96 | Cembre Ltd. Sutton Coldfield Turnover £34.5M | £22.3M | £34.5M |
| 97 | Oliver Valvetek Limited Cheshire Turnover £39.0M | £22.0M | £39.0M |
| 98 | Texecom Limited Rossendale Turnover £37.2M | £21.9M 2023 accounts | £37.2M |
| 99 | Micross Components Limited Norwich Turnover £41.5M | £21.7M | £41.5M |
| 100 | Pemberton Park and Leisure Homes Limited Lancashire | £21.1M | — |
| 101 | Brown & Carroll (London) Limited Basildon | £20.9M | — |
| 102 | Moyola Precision Engineering Limited Magherafelt Turnover £20.5M | £20.2M 2024 accounts | £20.5M |
| 103 | Ebm - Papst UK Limited Essex | £20.1M 2021 accounts | — |
| 104 | Preci-Spark Limited Syston Turnover £43.5M | £20.1M 2024 accounts | £43.5M |
| 105 | Takara Belmont (U.K.) Limited London Turnover £21.7M | £19.9M | £21.7M |
| 106 | Aluk (GB) Limited Chepstow | £19.9M 2024 accounts | — |
| 107 | Progressive Technology Limited Newbury | £19.6M | — |
| 108 | Tickhill Engineering Company Limited Doncaster | £19.5M 2024 accounts | — |
| 109 | Actegy Limited Bracknell | £19.5M 2024 accounts | — |
| 110 | Evertz UK Limited Wokingham Turnover £13.0M | £19.3M | £13.0M |
| 111 | Sigma Imaging (UK) Limited Welwyn Garden City Turnover £9.2M | £19.3M 2025 accounts | £9.2M |
| 112 | Street Crane Company Limited Derbyshire | £19.3M | — |
| 113 | HS Products Ltd Leeds | £19.1M | — |
| 114 | Tdk-Lambda UK Limited Ilfracombe Turnover £35.3M | £19.0M | £35.3M |
| 115 | Inca Digital Printers Limited Cambridge | £18.9M 2024 accounts | — |
| 116 | Veracity UK Limited Prestwick | £18.9M 2024 accounts | — |
| 117 | RVT Group Limited Aylesford | £18.9M | — |
| 118 | PX Manufacturing Ltd Cambridgeshire Turnover £49.6M | £18.8M 2024 accounts | £49.6M |
| 119 | Winbro Group Technologies Limited Leicestershire | £18.7M 2024 accounts | — |
| 120 | Aumovio UK Limited Birmingham Turnover £0 | £18.6M 2021 accounts | £0 |
| 121 | Caterham Cars Group Limited Dartford | £18.6M | — |
| 122 | Dutypoint Limited Gloucester | £18.6M | — |
| 123 | Ion Science Limited Royston Turnover £14.5M | £18.6M 2020 accounts | £14.5M |
| 124 | Wilton Engineering Services Limited Port Clarence Road | £18.5M | — |
| 125 | Hiden Analytical Limited Warrington | £18.5M 2024 accounts | — |
| 126 | Holroyd Components Limited Essex Turnover £15.6M | £18.3M | £15.6M |
| 127 | Hardall International Limited Dunstable Turnover £13.6M | £18.3M 2024 accounts | £13.6M |
| 128 | J.B.Corrie and Company Limited Hants Turnover £13.3M | £18.2M 2025 accounts | £13.3M |
| 129 | Aero Fabrications Limited Nottingham Turnover £27.9M | £18.2M | £27.9M |
| 130 | Ansaldo Nuclear Limited Wolverhampton | £18.1M | — |
| 131 | Presspart Manufacturing Limited Lancashire | £17.8M 2024 accounts | — |
| 132 | Rhino Products Limited Ellesmere Port | £17.8M 2025 accounts | — |
| 133 | X-Cel Superturn Ltd Rotherham | £17.7M | — |
| 134 | European Springs and Pressings Limited Beckenham Turnover £17.0M | £17.7M | £17.0M |
| 135 | Electronic Temperature Instruments Limited Worthing | £17.5M | — |
| 136 | MTL Advanced Ltd Darwen Turnover £50.8M | £17.3M 2024 accounts | £50.8M |
| 137 | Richardsons Leisure Limited Stalham Norwich Turnover £11.6M | £17.2M 2024 accounts | £11.6M |
| 138 | F & B Profiles Limited Bristol Turnover £36.4M | £17.2M | £36.4M |
| 139 | Llanelec Precision Engineering Company Limited Neath Turnover £18.7M | £17.1M | £18.7M |
| 140 | Blakley Electrics Limited Oxford Turnover £23.5M | £17.1M 2024 accounts | £23.5M |
| 141 | Silverson Machines Limited Greenford | £17.1M | — |
| 142 | Uni-Trunk Limited Lisburn Turnover £53.6M | £16.9M 2023 accounts | £53.6M |
| 143 | Tripleplay Services Limited London | £16.9M | — |
| 144 | Caudwell Marine Limited Stafford | £16.8M | — |
| 145 | Semco Maritime Limited Westhill Turnover £46.1M | £16.8M | £46.1M |
| 146 | Spellman High Voltage Electronics Limited. Pulborough | £16.7M | — |
| 147 | Biogas Technology Limited Salford Quays Turnover £7.5M | £16.7M | £7.5M |
| 148 | F.T. Gearing Systems Limited Aldershot | £16.5M | — |
| 149 | Pearl Yachts Ltd Warwick | £16.5M 2024 accounts | — |
| 150 | Auto-Trail V.R. Limited Europarc Turnover £55.6M | £16.5M 2022 accounts | £55.6M |
| 151 | Groundhog (U.K) Limited Neath | £16.3M 2024 accounts | — |
| 152 | Zeeco Europe Limited Oakham | £16.1M | — |
| 153 | Electronic Modular Services Limited Sea Street Herne Bay Turnover £21.4M | £16.0M | £21.4M |
| 154 | SPX Cooling Technologies UK Limited London Turnover £19.9M | £15.9M 2023 accounts | £19.9M |
| 155 | Warmflow Engineering Co.Limited Lisburn Turnover £20.3M | £15.9M | £20.3M |
| 156 | BGB Engineering Limited Lincolnshire | £15.9M 2024 accounts | — |
| 157 | Bisn Oil Tools Ltd Warrington | £15.8M | — |
| 158 | Specac Limited Orpington Turnover £12.1M | £15.8M | £12.1M |
| 159 | L.B. Foster Rail Technologies (UK) Limited Newcastle Upon Tyne | £15.8M | — |
| 160 | Kentec Electronics Limited Dartford Turnover £35.1M | £15.7M | £35.1M |
| 161 | Axis Electronics Limited Milton Keynes | £15.6M | — |
| 162 | Optima Stainless Limited King's Lynn | £15.6M | — |
| 163 | Barton Firtop Engineering Co Limited Kidderminster | £15.5M | — |
| 164 | J.Wareing & Son (Wrea Green) Limited Preston | £15.5M 2024 accounts | — |
| 165 | Vantrunk Ltd Turnover £34.1M | £15.5M 2023 accounts | £34.1M |
| 166 | Wallwork Heat Treatment Limited Lancashire Turnover £12.4M | £15.2M 2025 accounts | £12.4M |
| 167 | Automotive Group (Newcastle Upon Tyne) Limited Newcastle Upon Tyne Turnover £20.7M | £15.1M | £20.7M |
| 168 | Stanhope-Seta Limited Chertsey | £15.1M | — |
| 169 | Sicame UK Limited Hoo | £15.1M | — |
| 170 | Envea UK Ltd Cambridge | £15.0M | — |
| 171 | Kannegiesser UK Limited Banbury | £15.0M 2024 accounts | — |
| 172 | Crossland Tankers Limited Co.Londonderry Turnover £25.4M | £14.9M | £25.4M |
| 173 | Cavendish (Northern) Limited Billingham Turnover £38.5M | £14.5M | £38.5M |
| 174 | Emergency One (U.K.) Limited Cumnock | £14.5M 2024 accounts | — |
| 175 | Lebronze Alloys UK Limited Walsall | £14.4M | — |
| 176 | Lti Metaltech Limited Abingdon | £14.2M | — |
| 177 | Eblast Limited Aberdeenshire Turnover £11.1M | £14.2M 2024 accounts | £11.1M |
| 178 | Ejot U.K. Limited Glasgow | £14.1M | — |
| 179 | Carling Technologies Limited Clyst Honiton Turnover £24.9M | £14.0M 2024 accounts | £24.9M |
| 180 | Dalair Limited Wednesbury Turnover £25.8M | £14.0M | £25.8M |
| 181 | Wrekin Products Limited Lichfield Turnover £51.5M | £13.9M 2024 accounts | £51.5M |
| 182 | Slingsby Advanced Composites Limited North Yorkshire Turnover £22.4M | £13.8M | £22.4M |
| 183 | Transformers & Rectifiers Limited Surrey Turnover £17.8M | £13.7M | £17.8M |
| 184 | Universal Balancing Limited Bristol Turnover £11.1M | £13.6M 2019 accounts | £11.1M |
| 185 | Bri-Stor Systems Limited Stafford | £13.4M | — |
| 186 | Stolle Europe Limited Carlisle | £13.4M 2020 accounts | — |
| 187 | D.H. Industries Limited Laindon | £13.4M | — |
| 188 | E Collinson & Co Limited Preston | £13.4M 2024 accounts | — |
| 189 | Flo-Mech. Limited Peterborough Turnover £30.0M | £13.2M | £30.0M |
| 190 | Hanson Springs Limited Rochdale Turnover £31.4M | £13.2M 2024 accounts | £31.4M |
| 191 | Air Bearings Limited Ferndown Turnover £9.4M | £13.2M | £9.4M |
| 192 | Oxley Developments Company Limited Cumbria | £13.1M | — |
| 193 | Colchester Machine Tool Solutions Ltd Elland | £13.1M | — |
| 194 | Whittaker Engineering (Stonehaven) Limited Aberdeen Turnover £11.9M | £13.1M 2021 accounts | £11.9M |
| 195 | Exactaform Cutting Tools Limited Coventry | £13.0M 2024 accounts | — |
| 196 | Caley Ocean Systems Limited Aberdeen | £13.0M 2024 accounts | — |
| 197 | Dales Engineering Services Limited Peterhead Turnover £21.9M | £12.9M 2024 accounts | £21.9M |
| 198 | Atc Drivetrain UK Ltd Cannock Turnover £11.0M | £12.6M | £11.0M |
| 199 | Purex International Limited Brough | £12.6M | — |
| 200 | Metal Drum Company Limited(the) Co Durham Turnover £16.2M | £12.6M | £16.2M |
| 201 | Tioga Limited Derby Turnover £20.1M | £12.5M 2025 accounts | £20.1M |
| 202 | Cambustion Limited Cambridge Turnover £10.6M | £12.5M 2023 accounts | £10.6M |
| 203 | P.S.V. Transport Systems Limited Hoddesdon | £12.4M | — |
| 204 | Bryken Limited Liverpool | £12.4M 2024 accounts | — |
| 205 | Paramount 26 Limited West Thurrock Turnover £10.3M | £12.4M | £10.3M |
| 206 | Hyde Details Limited Stalybridge Turnover £10.2M | £12.4M | £10.2M |
| 207 | Marel Ltd Cardiff | £12.4M | — |
| 208 | Tesab Engineering Limited Omagh Turnover £24.8M | £12.3M 2021 accounts | £24.8M |
| 209 | Rivencore Global Solutions Limited Poole | £12.3M | — |
| 210 | Eliquo Hydrok Limited St. Columb Turnover £35.2M | £12.3M | £35.2M |
| 211 | European Safety Systems Limited Acton Turnover £29.4M | £12.3M | £29.4M |
| 212 | Cryogenic Limited London | £12.3M | — |
| 213 | Huber+suhner Polatis Limited Cambridge Turnover £22.7M | £12.2M | £22.7M |
| 214 | Highland Metals Limited Moray | £12.2M 2024 accounts | — |
| 215 | Swarco UK Limited Hemel Hempstead Turnover £31.9k | £12.2M 2024 accounts | £31.9k |
| 216 | Carnaby Caravans Limited Carnaby, Bridlington | £12.1M | — |
| 217 | Advanced Manufacturing (Sheffield) Limited Rotherham | £12.0M | — |
| 218 | Kudox Limited London | £12.0M | — |
| 219 | Total Integrated Solutions Limited Mansfield Turnover £19.5M | £12.0M 2023 accounts | £19.5M |
| 220 | Bushell & Meadows Limited Gloucestershire Turnover £8.5M | £12.0M | £8.5M |
| 221 | Optima Products Limited High Wycombe Turnover £19.7M | £11.9M 2025 accounts | £19.7M |
| 222 | Em-Lite Limited Mexborough | £11.9M | — |
| 223 | Autocraft Drivetrain Solutions Limited Grantham Turnover £39.7M | £11.9M 2021 accounts | £39.7M |
| 224 | Klinger Limited Euroway Trading Estate Bradford Turnover £27.2M | £11.8M 2024 accounts | £27.2M |
| 225 | Winder Power Limited Leeds Turnover £45.3M | £11.8M | £45.3M |
| 226 | Fleming Agri-Products Limited Co Londonderry | £11.8M 2024 accounts | — |
| 227 | Caterham Cars Ltd. Dartford | £11.7M | — |
| 228 | Mansfield, Pollard & Co. Limited Bradford | £11.7M | — |
| 229 | Elland Steel Structures Limited Halifax Turnover £17.9M | £11.5M | £17.9M |
| 230 | Alpha Manufacturing Hixon Limited Stafford | £11.5M | — |
| 231 | Derek Parnaby Cyclones International Limited Nr. Ferryhill | £11.5M | — |
| 232 | Ham-Let CFS Ltd Cambridge Turnover £26.6M | £11.5M | £26.6M |
| 233 | Orbital Gas Systems Limited Near Stone | £11.5M | — |
| 234 | Oerlikon Balzers Coating UK Limited Milton Keynes Turnover £7.5M | £11.5M 2019 accounts | £7.5M |
| 235 | Oliver Valves Limited Cheshire Turnover £32.4M | £11.4M | £32.4M |
| 236 | Wicksteed Leisure Limited Kettering | £11.3M 2024 accounts | — |
| 237 | Aanco (UK) Limited Billingham | £11.3M 2024 accounts | — |
| 238 | Lander Automotive Ltd. Birmingham Turnover £16.7M | £11.2M | £16.7M |
| 239 | Dale Power Solutions Limited Scarborough Turnover £32.0M | £11.2M 2024 accounts | £32.0M |
| 240 | Newspace Containers Limited Lydney | £11.2M | — |
| 241 | Orange Music Electronic Company Limited Borehamwood Turnover £16.0M | £11.1M 2022 accounts | £16.0M |
| 242 | Heller Machine Tools Limited Worcestershire Turnover £60.8M | £11.1M | £60.8M |
| 243 | Lesjofors Heavy Springs UK Limited Redruth Turnover £20.0M | £11.0M | £20.0M |
| 244 | JLG Industries (United Kingdom) Limited Oldham Turnover £33.8M | £11.0M 2023 accounts | £33.8M |
| 245 | CPD Bodies Limited Cleveland Turnover £26.3M | £11.0M | £26.3M |
| 246 | Osg U.K. Limited Basildon | £11.0M | — |
| 247 | Samtec (Europe) Limited Glasgow | £11.0M | — |
| 248 | Porta-Fill International Limited Dungannon | £11.0M 2024 accounts | — |
| 249 | J. Barnsley Cranes Limited Brierley Hill Turnover £8.8M | £10.9M | £8.8M |
| 250 | Washington Metalworks Limited Gateshead Turnover £14.1M | £10.9M | £14.1M |
| 251 | Severfield Structural Solutions Limited Thirsk Turnover £21.7M | £10.9M 2020 accounts | £21.7M |
| 252 | Tekever Ltd Southampton | £10.9M 2023 accounts | — |
| 253 | Scarab Sweepers Limited Tonbridge | £10.8M 2023 accounts | — |
| 254 | Esprit Automation Limited Nottingham Turnover £11.7M | £10.8M 2024 accounts | £11.7M |
| 255 | Barnes Marine Units Limited Norwich Turnover £5.7M | £10.8M 2025 accounts | £5.7M |
| 256 | Buddi Limited Rickmansworth Turnover £18.1M | £10.8M 2019 accounts | £18.1M |
| 257 | Redwood Global Limited Andover | £10.5M | — |
| 258 | Carallon Ltd London | £10.5M | — |
| 259 | Scorpion Automotive Limited Bolton Turnover £20.3M | £10.4M | £20.3M |
| 260 | Mold Masters (UK) Limited Hereford Turnover £8.3M | £10.4M | £8.3M |
| 261 | Asco Engineering Limited Skelmersdale Turnover £10.5M | £10.4M 2024 accounts | £10.5M |
| 262 | Apem Components Limited Aylesbury Turnover £22.3M | £10.4M 2019 accounts | £22.3M |
| 263 | Hartridge Limited Gawcott Turnover £11.0M | £10.4M | £11.0M |
| 264 | Ams Neve Limited Burnley Turnover £11.9M | £10.3M 2024 accounts | £11.9M |
| 265 | Samuel Taylor,limited Worcestershire Turnover £26.0M | £10.3M 2022 accounts | £26.0M |
| 266 | Powervamp Limited Bedford Turnover £23.4M | £10.3M 2024 accounts | £23.4M |
| 267 | Norfolk Broads Direct Limited Wroxham Turnover £4.4M | £10.2M | £4.4M |
| 268 | Headstock Distribution Limited Halesowen Turnover £16.7M | £10.2M 2025 accounts | £16.7M |
| 269 | Asa UK & Ireland Limited Liverpool | £10.2M | — |
| 270 | Iceotope Technologies Limited Rotherham | £10.2M 2025 accounts | — |
| 271 | Simm Tronic Limited Hoddesdon | £10.1M | — |
| 272 | Renthal Limited Stockport Turnover £13.2M | £10.1M 2024 accounts | £13.2M |
| 273 | Hi-Lex Act Wales Ltd Ammanford Turnover £22.9M | £10.0M 2022 accounts | £22.9M |
| 274 | Atmos International Limited Manchester | £10.0M 2024 accounts | — |
| 275 | Anglo Metal Forming Limited Wednesbury Turnover £12.8M | £10.0M 2021 accounts | £12.8M |
| 276 | Stackright Ltd Skelmersdale | £9.9M | — |
| 277 | E C M Systems Limited London Turnover £11.4M | £9.8M 2024 accounts | £11.4M |
| 278 | Gill Instruments Limited Exeter Turnover £15.1M | £9.8M | £15.1M |
| 279 | Bailey Caravans Limited Bristol Turnover £131.0M | £9.8M 2022 accounts | £131.0M |
| 280 | The West Group Limited Waterlooville Turnover £14.6M | £9.8M | £14.6M |
| 281 | Loudspeaker Technology Limited Stroud | £9.7M | — |
| 282 | Aerospace Tooling Limited London Turnover £6.6M | £9.7M 2025 accounts | £6.6M |
| 283 | Precise Component Manufacture Limited March | £9.6M | — |
| 284 | G.T.K. (U.K.) Ltd. Basingstoke Turnover £18.0M | £9.6M 2025 accounts | £18.0M |
| 285 | Tritech International Limited Westhill Turnover £17.0M | £9.6M | £17.0M |
| 286 | Jaltek Systems Limited Luton | £9.6M 2024 accounts | — |
| 287 | S&P UK Ventilation Systems Ltd. Ipswich | £9.5M | — |
| 288 | Newsmith Stainless Limited Liversedge Turnover £13.1M | £9.5M | £13.1M |
| 289 | Lichtgitter (U.K.) Limited Cannock | £9.5M | — |
| 290 | Avia Technique Limited Wokingham Turnover £27.6M | £9.5M 2023 accounts | £27.6M |
| 291 | Secure Innovation Limited Saltash Turnover £13.7M | £9.4M 2024 accounts | £13.7M |
| 292 | William Smith Group 1832 Limited Barnard Castle Turnover £26.6M | £9.3M | £26.6M |
| 293 | Bunting Magnetics Europe Limited Hertfordshire | £9.3M 2022 accounts | — |
| 294 | Metallink Fluid Power Systems Limited Crook | £9.3M 2024 accounts | — |
| 295 | Cahill Welding Services Ltd. Henstridge Turnover £25.0M | £9.3M | £25.0M |
| 296 | Kelvinside Electronics Limited Strathclyde | £9.3M | — |
| 297 | Colorminium (London) Ltd Chelmsford Turnover £35.6M | £9.3M | £35.6M |
| 298 | Guttercrest Limited Oswestry Turnover £12.3M | £9.2M | £12.3M |
| 299 | Hickman & Love (Tipton) Limited West Midlands | £9.2M | — |
| 300 | Hodge Clemco Limited Sheffield | £9.2M 2024 accounts | — |