| 1 | British Gas Trading LIMITED | Unitedkingdom | Windsor | Millstream | Windsor and Maidenhead | SL4 5GD | britishgas.***** | 1995 | $26,637,811,672 | 6,409 | N/A | N/A | N/A |
| 2 | Tti, INC. | Unitedkingdom | Booker | Suite C Artisan | Buckinghamshire | HP12 4HJ | ttieurope.***** | 2007 | $7,861,110,100 | 30 | N/A | N/A | N/A |
| 3 | Canon Europa NV | Unitedkingdom | Toton | Paisley Grove Chilwell Meadows Business Park | Nottinghamshire | NG9 6DJ | canon-europe.***** | 1983 | $6,489,329,915 | 12,470 | N/A | N/A | N/A |
| 4 | Dyson Technology LIMITED | Unitedkingdom | Malmesbury | Tetbury Hill | Wiltshire | SN16 0RP | dysoninstitute.***** | 1985 | $6,353,702,413 | 3,314 | N/A | N/A | N/A |
| 5 | Mitsubishi Electric Europe B.V. | Unitedkingdom | Hatfield | Travellers Lane | Hertfordshire | AL10 8XB | mitsubishielectric.***** | 1969 | $4,596,697,766 | 3,813 | N/A | N/A | N/A |
| 6 | Samsung Electronics (UK) LIMITED | Unitedkingdom | Chertsey | 2000 Hillswood Drive | Surrey | KT16 0RS | samsung.***** | 1995 | $4,500,707,183 | 1,385 | N/A | N/A | N/A |
| 7 | Sensata Technologies Holding PLC | Unitedkingdom | Royal Wootton Bassett | Interface House Interface Business Park, Bincknoll Lane | Wiltshire | SN4 8SY | N/A | 2017 | $3,932,764,000 | 19,000 | N/A | N/A | N/A |
| 8 | Sony Europe B.V. | Unitedkingdom | Weybridge | The Heights | Surrey | KT13 0XW | sony.***** | 2018 | $3,353,533,576 | 2,821 | N/A | N/A | N/A |
| 9 | General Electric Global Services GMBH | Unitedkingdom | Pendas Fields | 1200 Century Way | Leeds, West Yorkshire | LS15 8ZA | N/A | 2015 | $3,290,706,677 | 250 | N/A | N/A | N/A |
| 10 | Leonardo UK LTD | Unitedkingdom | London | 1 Eagle Place | London | SW1Y 6AF | uk.***** | 1864 | $2,966,263,056 | 8,439 | N/A | N/A | N/A |
| 11 | Cirrus Logic International (UK) LTD | Unitedkingdom | Gorgie | 7b Nightingale Way | City of Edinburgh | EH3 9EG | cirruslogic.***** | 1984 | $1,886,078,000 | 478 | N/A | N/A | N/A |
| 12 | On Semiconductor LIMITED | Unitedkingdom | Moorgate | 1 Bow Churchyard | London | EC4M 9DQ | N/A | 1999 | $1,643,247,745 | 311 | N/A | N/A | N/A |
| 13 | Thales UK LIMITED | Unitedkingdom | Southcote | 350 Longwater Avenue | Reading | RG2 6GF | thalesgroup.***** | 1893 | $1,494,717,508 | 5,629 | N/A | N/A | N/A |
| 14 | Nortel Networks UK LIMITED | Unitedkingdom | Rotherhithe | 1 More London Place | London | SE1 2AF | N/A | 1985 | $1,392,975,500 | 2,242 | N/A | N/A | N/A |
| 15 | Renesas Electronics Europe GMBH | Unitedkingdom | Bourne End | 2 Dukes Meadow | Buckinghamshire | SL8 5FH | renesas.***** | 1981 | $1,293,172,918 | 784 | N/A | N/A | N/A |
| 16 | Volex PLC | Unitedkingdom | Upton Grey | Unit C | Hampshire | RG24 8PZ | volex.***** | 1919 | $1,086,500,000 | 13,184 | N/A | N/A | N/A |
| 17 | Schneider Electric LIMITED | Unitedkingdom | Telford | Stafford Park 5 | Telford and Wrekin | TF3 3BL | schneider-electric.***** | 1978 | $1,062,651,899 | 2,665 | N/A | N/A | N/A |
| 18 | Siemens Energy LIMITED | Unitedkingdom | Walker | C A Parsons Works | Newcastle Upon Tyne, Tyne and Wear | NE6 2YL | siemens-energy.***** | 1961 | $1,032,658,804 | 1,793 | N/A | N/A | N/A |
| 19 | Zf Automotive UK LIMITED | Unitedkingdom | Hockley Heath | Central Boulevard, the Hub | Solihull, West Midlands | B90 8BG | trw.***** | 1905 | $898,235,904 | 1,735 | N/A | N/A | N/A |
| 20 | Tokyo Electron Europe LIMITED | Unitedkingdom | Crawley | Crawley Business Quarter | West Sussex | RH10 9QL | tel.***** | 1994 | $830,941,832 | 606 | N/A | N/A | N/A |
| 21 | Sk Hynix UK LIMITED | Unitedkingdom | Weybridge | Unit 4 | Surrey | KT13 0TJ | hynix.***** | 1995 | $806,247,000 | 112 | N/A | N/A | N/A |
| 22 | Omron Electronic Components Europe B.V. | Unitedkingdom | Stevenage | Unit A Campus 6 | Hertfordshire | SG1 2XD | components.***** | 2002 | $775,156,966 | 1,972 | N/A | N/A | N/A |
| 23 | Siemens PLC | Unitedkingdom | Farnborough | Pinehurst Ii | Hampshire | GU14 7BF | siemens.***** | 1962 | $709,828,458 | 2,145 | N/A | N/A | N/A |
| 24 | Robert Bosch LIMITED | Unitedkingdom | Durden Court | Robert Bosch Ltd | Buckinghamshire | UB9 5HJ | bosch.***** | 1924 | $626,760,996 | 665 | N/A | N/A | N/A |
| 25 | Beko PLC | Unitedkingdom | Watford | 1 Greenhill Crescent | Hertfordshire | WD18 8QU | beko.***** | 1989 | $585,586,685 | 332 | N/A | N/A | N/A |
| 26 | Abb LIMITED | Unitedkingdom | Preston on the Hill | Daresbury Park | Halton | WA4 4BT | abb.***** | 1999 | $582,947,371 | 1,399 | N/A | N/A | N/A |
| 27 | Prysmian Cables & Systems LIMITED | Unitedkingdom | Eastleigh | Chickenhall Lane | Hampshire | SO50 6YU | prysmiangroup.***** | 1969 | $561,154,649 | 1,004 | N/A | N/A | N/A |
| 28 | Tosoh Quartz, INC. | Unitedkingdom | Stanley | Unit 2 | Durham | DH9 7YB | tosohquartz.***** | 2005 | $503,616,000 | 30 | N/A | N/A | N/A |
| 29 | Philips Electronics UK LIMITED | Unitedkingdom | Farnborough | Ascent 1 | Hampshire | GU14 6XW | philips.***** | 1947 | $462,427,385 | 858 | N/A | N/A | N/A |
| 30 | Kla CORPORATION UK LIMITED | Unitedkingdom | Lower Machen | Celtic Way | Newport | NP10 8BE | spts.***** | 2009 | $448,888,000 | 565 | N/A | N/A | N/A |
| 31 | Arrow Electronics (UK) LIMITED | Unitedkingdom | Potter Street | Kao 1, Kao Park | Essex | CM17 9NA | arroweurope.***** | 1991 | $437,076,144 | 417 | N/A | N/A | N/A |
| 32 | Spectrum Brands (UK) LIMITED | Unitedkingdom | Greenfield | Fir Street | Manchester, Greater Manchester | M35 0HS | spectrumbrands.***** | 1989 | $432,843,951 | 351 | N/A | N/A | N/A |
| 33 | Gs Yuasa Battery Europe LIMITED | Unitedkingdom | Ebbw Vale | Unit 22 | Blaenau Gwent | NP23 5SD | yuasabatteries.***** | 1895 | $423,357,662 | 627 | N/A | N/A | N/A |
| 34 | Renesas Design (UK) LIMITED | Unitedkingdom | Bourne End | 2 Dukes Meadow | Buckinghamshire | SL8 5FH | renesas.***** | 1985 | $409,466,000 | 311 | N/A | N/A | N/A |
| 35 | Glenair UK LIMITED | Unitedkingdom | Mansfield | Oakham Bus. | Nottinghamshire | NG18 5BY | glenair.***** | 1975 | $373,925,245 | 1,453 | N/A | N/A | N/A |
| 36 | Teledyne UK LIMITED | Unitedkingdom | Chelmsford | 106 Waterhouse Lane | Essex | CM1 2QU | teledyne.***** | 1947 | $344,681,468 | 1,410 | N/A | N/A | N/A |
| 37 | Aesc UK Plant 1 LIMITED | Unitedkingdom | Castletown | Washington Road | Sunderland, Tyne and Wear | SR5 3NS | aesc-group.***** | 2017 | $334,709,930 | 458 | N/A | N/A | N/A |
| 38 | General Electric Company LTD | Unitedkingdom | City of London | 68 Lombard Street | London | EC3V 9LJ | N/A | 2020 | $320,404,939 | 13 | N/A | N/A | N/A |
| 39 | Holmen Board And Paper LIMITED | Unitedkingdom | Workington | Siddick | Cumbria | CA14 1JX | iggesund.***** | 1902 | $314,094,837 | 362 | N/A | N/A | N/A |
| 40 | Anord Mardix (UK) LIMITED | Unitedkingdom | Kendal | Castle Mills | Cumbria | LA9 7DE | anordmardix.***** | 1966 | $299,393,989 | 928 | N/A | N/A | N/A |
| 41 | Vertiv E&I Engineering LTD. | Unitedkingdom | Eglinton | 1 Fruit of the Loom Drive | Derry and Strabane | BT47 3XY | e-i-eng.***** | 2016 | $298,749,941 | 5 | N/A | N/A | N/A |
| 42 | London Security PLC. | Unitedkingdom | Elland | Premier House | Calderdale, West Yorkshire | HX5 9DY | nuswift.***** | 1897 | $279,717,836 | 1,639 | N/A | N/A | N/A |
| 43 | Tyco Electronics UK LTD | Unitedkingdom | Dorcan | Faraday Road | Swindon | SN3 5HH | te.***** | 1955 | $273,136,452 | 1,196 | N/A | N/A | N/A |
| 44 | Adi-Gardiner LIMITED | Unitedkingdom | Diggle | Unit 6, Broadgate | Manchester, Greater Manchester | OL9 9XA | adiglobal.***** | 1977 | $265,089,303 | 355 | N/A | N/A | N/A |
| 45 | Nexperia UK LTD. | Unitedkingdom | Woodley | Bramhall Moor Lane | Manchester, Greater Manchester | SK7 5BJ | nexperia.***** | 2006 | $244,164,427 | 1,080 | N/A | N/A | N/A |
| 46 | Rohm Semiconductor GMBH | Unitedkingdom | Tilbrook | Caldecotte Lake Business Park 3 | Milton Keynes | MK7 8LQ | rohm.***** | 2003 | $243,519,098 | 185 | N/A | N/A | N/A |
| 47 | Diebold Nixdorf (UK) LIMITED | Unitedkingdom | Bracknell | One the Boulevard Cain Road | Bracknell Forest | RG12 1WP | N/A | 1959 | $243,462,409 | 619 | N/A | N/A | N/A |
| 48 | Cubic Transportation Systems LIMITED | Unitedkingdom | Redhill | A F C House | Surrey | RH1 5LA | cubic.***** | 1978 | $242,353,338 | 1,089 | N/A | N/A | N/A |
| 49 | Ge Energy Power Conversion UK LIMITED | Unitedkingdom | Rugby | Thomson Houston Way | Warwickshire | CV21 1BD | N/A | 1989 | $240,955,828 | 704 | N/A | N/A | N/A |
| 50 | Avnet Emg LTD. | Unitedkingdom | Stevenage | Avnet House | Hertfordshire | SG1 2EF | avnet.***** | 2003 | $224,229,115 | 481 | N/A | N/A | N/A |
| 51 | F.W. Thorpe Public LIMITED Company | Unitedkingdom | Church Hill North | Merse Road | Worcestershire | B98 9HH | thorlux.***** | 1936 | $223,560,207 | 962 | N/A | N/A | N/A |
| 52 | Panasonic Manufacturing U.K. LTD. | Unitedkingdom | Llanedeyrn | Pentwyn Estate | Cardiff | CF23 7XB | panasonic.***** | 1976 | $220,558,801 | 353 | N/A | N/A | N/A |
| 53 | Sumco Europe Sales PLC | Unitedkingdom | Stepney | 30 Churchill Place | London | E14 5RE | sumcosi.***** | 1988 | $216,831,750 | 27 | N/A | N/A | N/A |
| 54 | Focusrite PLC | Unitedkingdom | Booker | Artisan | Buckinghamshire | HP12 4HJ | focusrite.***** | 2014 | $204,065,884 | 537 | N/A | N/A | N/A |
| 55 | Allegro Microsystems Europe LIMITED | Unitedkingdom | Chertsey | Melita House | Surrey | KT16 8LH | allegromicro.***** | 1990 | $198,336,543 | 164 | N/A | N/A | N/A |
| 56 | Alphatheta EMEA LIMITED | Unitedkingdom | Slough | Wellington Street | Slough | SL1 1YP | N/A | 1994 | $195,258,084 | 270 | N/A | N/A | N/A |
| 57 | Volution Ventilation UK LIMITED | Unitedkingdom | Crawley | Fleming Way | West Sussex | RH10 9YX | airtechenvironmental.***** | 2018 | $191,291,607 | 815 | N/A | N/A | N/A |
| 58 | Eaton Electric LIMITED | Unitedkingdom | Slough | 252 Bath Road | Slough | SL1 4DX | eaton.***** | 1911 | $186,459,197 | 462 | N/A | N/A | N/A |
| 59 | Chelton LIMITED | Unitedkingdom | Marlow | The Chelton Centre | Buckinghamshire | SL7 1TF | cobham.***** | 1947 | $185,865,802 | 485 | N/A | N/A | N/A |
| 60 | Dialight PLC | Unitedkingdom | London | 60 Petty France | London | SW1H 9EU | dialight.***** | 1990 | $183,500,000 | 1,425 | N/A | N/A | N/A |
| 61 | Cambium Networks, LTD | Unitedkingdom | Widecombe in the Moor | Cambium Networks | Devon | TQ13 7UP | cambiumnetworks.***** | 2011 | $182,933,000 | 454 | N/A | N/A | N/A |
| 62 | Mayflex UK LIMITED | Unitedkingdom | Holford | Excel | Birmingham, West Midlands | B6 7JJ | mayflex.***** | 1917 | $180,952,448 | 234 | N/A | N/A | N/A |
| 63 | W B Power Services LIMITED | Unitedkingdom | Heanor | Heanor Gate Industrial Estate Heanor Gate Road | Derbyshire | DE75 7RJ | wbpsltd.***** | 1987 | $180,305,866 | 308 | N/A | N/A | N/A |
| 64 | Calderstone Productions LIMITED | Unitedkingdom | Shepherd'S Bush | 364-366 Kensington High Street | London | W14 8NS | N/A | 2012 | $178,329,898 | 307 | N/A | N/A | N/A |
| 65 | Luceco UK LIMITED | Unitedkingdom | Telford | Building E | Telford and Wrekin | TF3 3BD | luceco.***** | 1988 | $177,734,152 | 279 | N/A | N/A | N/A |
| 66 | Emi Music Publishing Group International B.V. | Unitedkingdom | Ladbroke Grove | 27 Wrights Lane | London | W8 5SW | universalmusic.***** | 2004 | $177,062,464 | 4 | N/A | N/A | N/A |
| 67 | Ccl Components LTD. | Unitedkingdom | East Kilbride | 1 Cairn Court | South Lanarkshire | G74 4NB | cclcomponents.***** | 1997 | $175,851,577 | 60 | N/A | N/A | N/A |
| 68 | Duracell UK LIMITED | Unitedkingdom | Richmond | Spencer House | London | TW9 1BN | N/A | 2015 | $175,404,830 | 52 | N/A | N/A | N/A |
| 69 | Trina Storage (UK) LTD | Unitedkingdom | Kegworth | Herald Way | Leicestershire | DE74 2TZ | trinasolar.***** | 2012 | $174,391,802 | 17 | N/A | N/A | N/A |
| 70 | B & W Group LTD | Unitedkingdom | Worthing | Dale Road | West Sussex | BN11 2BH | bwgroup.***** | 1966 | $168,170,000 | 381 | N/A | N/A | N/A |
| 71 | Thorn Lighting (fittings) LIMITED | Unitedkingdom | Spennymoor | Trad Est | Durham | DL16 7HA | N/A | 1946 | $167,820,215 | 2,200 | N/A | N/A | N/A |
| 72 | Ge Energy (UK) LIMITED | Unitedkingdom | Altrincham | 3rd Floor 1 Ashley Road | Manchester, Greater Manchester | WA14 2DT | N/A | 1912 | $166,222,079 | 400 | N/A | N/A | N/A |
| 73 | Astute Electronics LIMITED | Unitedkingdom | Stevenage | Astute House | Hertfordshire | SG1 2EF | astute.***** | 1988 | $163,497,989 | 374 | N/A | N/A | N/A |
| 74 | Solid State PLC | Unitedkingdom | Holt End | Ravensbank Business Park | Worcestershire | B98 9EY | sssplc.***** | 1963 | $158,204,084 | 429 | N/A | N/A | N/A |
| 75 | Canon Europe LIMITED | Unitedkingdom | Harmondsworth | 4 Roundwood Avenue | London | UB11 1AF | canon.***** | 2003 | $157,006,219 | 769 | N/A | N/A | N/A |
| 76 | Arabelle Services UK LIMITED | Unitedkingdom | Rugby | Newbold Road | Warwickshire | CV21 2NH | N/A | 2002 | $155,118,836 | 368 | N/A | N/A | N/A |
| 77 | Legrand Electric LIMITED | Unitedkingdom | Aston | Great King Street North | Birmingham, West Midlands | B19 2LF | legrand.***** | 1911 | $153,431,163 | 623 | N/A | N/A | N/A |
| 78 | Neatframe LIMITED | Unitedkingdom | Moorgate | Cannon Green | London | EC4R 0AA | N/A | 2019 | $151,090,106 | 244 | N/A | N/A | N/A |
| 79 | Iqe PLC | Unitedkingdom | Saint Mellons | Pascal Close | Cardiff | CF3 0LW | iqesilicon.***** | 1999 | $149,629,577 | 517 | N/A | N/A | N/A |
| 80 | Danfoss LIMITED | Unitedkingdom | George Green | 22 Wycombe End | Buckinghamshire | HP9 1NB | N/A | 1991 | $149,066,147 | 462 | N/A | N/A | N/A |
| 81 | Eurostar Global Electronics LIMITED | Unitedkingdom | Newcastle-under-lyme | Unit 4 | Staffordshire | ST5 9QF | eurostarglobalelectronics.***** | 2007 | $148,198,738 | 223 | N/A | N/A | N/A |
| 82 | Signify Commercial UK LIMITED | Unitedkingdom | Wood Street | 2 Guildford Business Park | Surrey | GU2 8XG | N/A | 1934 | $147,853,366 | 190 | N/A | N/A | N/A |
| 83 | Huba Control AG | Unitedkingdom | Swindon | Unit 13 Berkshire House | Swindon | SN1 2NR | hubacontrol.***** | 2001 | $147,710,972 | 250 | N/A | N/A | N/A |
| 84 | Pioneer & Onkyo Europe GMBH | Unitedkingdom | George Green | Kengo Iwasaki | Buckinghamshire | HP9 1ER | N/A | 2004 | $145,588,656 | 70 | N/A | N/A | N/A |
| 85 | Thales Dis UK LIMITED | Unitedkingdom | Anthill Common | Concorde Way | Hampshire | PO15 5RX | gemalto.***** | 1976 | $145,469,045 | 372 | N/A | N/A | N/A |
| 86 | Apption Labs LIMITED | Unitedkingdom | Braunstone Town | 66 Commercial Square | Leicester | LE2 7SR | meater.***** | 2015 | $144,817,592 | 146 | N/A | N/A | N/A |
| 87 | Hager LIMITED | Unitedkingdom | Sutton Hill | Hager Ltd | Telford and Wrekin | TF1 7FT | hager.***** | 1981 | $143,443,003 | 365 | N/A | N/A | N/A |
| 88 | Tunstall Healthcare (UK) LIMITED | Unitedkingdom | Eggborough | Whitley Lodge | North Yorkshire | DN14 0HR | tunstall.***** | 1957 | $143,185,213 | 653 | N/A | N/A | N/A |
| 89 | Hid CORPORATION LIMITED | Unitedkingdom | Haverhill | Haverhill Business Park | Suffolk | CB9 7AE | hidglobal.***** | 1998 | $140,637,287 | 444 | N/A | N/A | N/A |
| 90 | Sepura LIMITED | Unitedkingdom | Horningsea | 9000 Cambridge Research Park | Cambridgeshire | CB25 9TL | sepura.***** | 2002 | $140,436,005 | 399 | N/A | N/A | N/A |
| 91 | Thorn Lighting LIMITED | Unitedkingdom | Spennymoor | House of Light | Durham | DL16 6HL | thornlighting.***** | 1932 | $139,423,466 | 420 | N/A | N/A | N/A |
| 92 | Landis + Gyr LIMITED | Unitedkingdom | Benchill | Trident Business Park | Manchester, Greater Manchester | M22 5XB | londis.***** | 1975 | $138,701,141 | 197 | N/A | N/A | N/A |
| 93 | Midsummer Energy LTD | Unitedkingdom | Milton | Cambridge Road Industrial Estate, Milton | Cambridgeshire | CB24 6AZ | midsummerenergy.***** | 2010 | $138,532,711 | 124 | N/A | N/A | N/A |
| 94 | Ford Halewood Transmissions LIMITED | Unitedkingdom | Laindon | Arterial Road | Essex | SS15 6EE | N/A | 2013 | $133,435,852 | 526 | N/A | N/A | N/A |
| 95 | Dyson Finance LIMITED | Unitedkingdom | Malmesbury | Tetbury Hill | Wiltshire | SN16 0RP | dyson.***** | 2007 | $127,228,950 | 6 | N/A | N/A | N/A |
| 96 | Lucy Electric UK LIMITED | Unitedkingdom | Thame | Howland Road | Oxfordshire | OX9 3UJ | lucyelectric.***** | 1974 | $126,564,150 | 206 | N/A | N/A | N/A |
| 97 | Zg Lighting (UK) LIMITED | Unitedkingdom | Gerrards Cross | Chiltern Park | Buckinghamshire | SL9 9FG | zumtobel.***** | 1993 | $123,654,524 | 167 | N/A | N/A | N/A |
| 98 | Anglia Components PLC | Unitedkingdom | Wisbech | Sandall Road | Cambridgeshire | PE13 2PS | anglia-live.***** | 1972 | $123,274,735 | 290 | N/A | N/A | N/A |
| 99 | Zenobe Energy LIMITED | Unitedkingdom | Marylebone | First Floor, Burdett House | London | WC2N 6DU | zenobe.***** | 2017 | $122,740,774 | 269 | N/A | N/A | N/A |
| 100 | Enersys LTD. | Unitedkingdom | Bishton | Stephenson Street | Newport | NP19 4XJ | enersys.***** | 1962 | $119,706,357 | 493 | N/A | N/A | N/A |