- JOHN CALVERT- Born February 1914 - 6 SPRINGFIELD CRESCENT, SEAHAM, COUNTY DURHAM, SR7 7SU 
- JOHN S. CALVERT- 1800 77TH NORTH EAST, BELLEVUE, WASHINGTON 98004, UNITED STATES 
- JOHN CALVERT- Born March 1948 - HAIGHTON TOWER WHITTINGHAM LANE, HAIGHTON, PRESTON, PR2 5SL 
- MR JOHN INVEST LIMITEDDisolved- 07277737 - Dissolved on 16 November 2021 
- MR JOHN PILLOW LIMITEDDissolved- 09148892 - Dissolved on 2 January 2018 
- S CALVERT LTDDissolved- 07447756 - Dissolved on 23 April 2013 
- K CALVERT LTD- 07773775 - Incorporated on 14 September 2011 
- CALVERT 7 LTD- 10554404 - Incorporated on 10 January 2017 
- MR JOHN INTERNATIONAL LTD- 15732972 - Incorporated on 21 May 2024 
- MR DARRYL JOHN EVANS LTDDisolved- 15406074 - Dissolved on 17 June 2025 
- MR JOHNSTONE'S T.B LIMITEDActive - Proposal to Strike off- 08055187 - Incorporated on 2 May 2012 
- THE LAW CHIEF JUSTICE MR NEVILLE A. JOHNSON (UK) LIMITEDActive - Proposal to Strike off- 04585990 - Incorporated on 8 November 2002 
- Anthony John, Mr. GRICE- Born May 1952 - Tyn Y Cae Llangedwyn, Oswestry, Wales, SY10 9LB 
- John Anthony, Mr. DOYLE- Born July 1945 - 192 Booker Avenue, Liverpool, United Kingdom, L18 9TB 
- Anthony John, Mr. GRICE- Born May 1952 - Apartment 1 Broadfold Hall, Dean House Lane, Halifax, West Yorkshire, England, HX2 6TW 
- Anthony John, Mr. TOUGH- Born March 1954 - 256 Southmead Road Bristol, Bristol, United Kingdom, BS10 5EN 
- Anthony John, Mr. GREEN- Born January 1981 - 1 Stanstead Close, Whelley, Wigan, Lancashire, WN2 1AN 
- John Anthony, Mr. DOYLE- Born July 1945 - 192 Booker Avenue, Liverpool, Merseyside, L18 9TB 
- CALVERT STUDIOS UK & SPAIN LIMITED- 01253360 - Incorporated on 5 April 1976 
- Matthew Vincent, Mr. CALVERT- Born February 1974 - 1 Leskinnick Terrace, Penzance, England, TR18 2HB