- STEFF DESIGN LIMITED- 12012211 - Incorporated on 22 May 2019 
- STEFF MOTORS LIMITEDActive - Proposal to Strike off- 08033430 - Incorporated on 17 April 2012 
- STEFF-ARTIST LTDActive - Proposal to Strike off- 08586011 - Incorporated on 26 June 2013 
- STEFF INTERIORS LTDDisolved- 13288171 - Dissolved on 20 February 2024 
- STEFF-ANNIE LIMITED- 13936955 - Incorporated on 24 February 2022 
- STEFF PSICOLOGIA LTD- 15584968 - Incorporated on 22 March 2024 
- STEFF DAY LIMITED- 16345167 - Incorporated on 26 March 2025 
- JOHN CHARLES STEFF- Born November 1932 - 5 BEECHCROFT CLOSE, SUNNINGHILL, ASCOT, BERKSHIRE, SL5 7DB 
- JANET HARDING- Born September 1959 - 145 WOODHOUSE LANE, BRIGHOUSE, WEST YORKSHIRE, UNITED KINGDOM, HD6 3TP 
- JANET HARDING- HIGH VIEW,HIGH ROAD, BRIGHTWELL CUM SOTWELL, WALLINGFORD, OX10 0QT 
- JANET HARDING- Born August 1955 - 20 ANDERSON HOUSE, HOLLINS DRIVE, STAFFORD, STAFFORDSHIRE, ENGLAND, ST16 1FA 
- JANET HARDING- UNIT 4 ALDHAM INDUSTRIAL ESTATE, MITCHELL ROAD, WOMBWELL, BARNSLEY, SOUTH YORKSHIRE, ENGLAND, S73 8HA 
- JANET HARDING- Born October 1953 - 100 BRAMPTON ROAD, WATH UPON DEARNE, ROTHERHAM, SOUTH YORKSHIRE, UNITED KINGDOM, S63 6AW 
- JANET HARDING- Born October 1953 - 11 GRASSLEES, RICKLETON, WASHINGTON, TYNE AND WEAR, NE38 9JA 
- JANET HARDING- Born September 1959 - 5 DEMONTFORT MEWS, COLESHILL, BIRMINGHAM, B46 
- JANET HARDING- FLAT 1, 19 ST RONANS AVENUE, SOUTHSEA, HAMPSHIRE, PO4 0QE 
- JANET HARDING- 50 LUBBESTHORPE ROAD, BRAUNSTONE, LEICESTER, LEICS., LE3 2XD 
- JANET HARDING- Born September 1959 - 5 DE MONTFORTE MEWS, OFF PARKFIELD ROAD, COLESHILL, WEST MIDLANDS, B46 3AP 
- JANET HARDING- Born October 1953 - 15 ST. JOHNS PLACE, BIRTLEY, CHESTER LE STREET, COUNTY DURHAM, UNITED KINGDOM, DH3 2PW 
- STEFFI LIMITEDDissolved- 08166338 - Dissolved on 10 December 2013