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| Company | Status | Telephone | Net Assets | Turnover | ||
| 1 | Nationwide Trust Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | – | £1 | – | |
| 2 | U C B Home Loans Corporation Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £293.9m | £54.5m | |
| 3 | Exeter Trust Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | – | £1 | – | |
| 4 | Confederation Mortgage Services Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £1 | – | |
| 5 | Ni1 Limited Nationwide House, Pipers Way, Swindon SN38 1NW | DORMANT | Upgrade to view | £2 | – | |
| 6 | Nationwide Home Loans Limited Nationwide House, Pipers Way, Swindon, SN38 1NW | DORMANT | – | £2 | – | |
| 7 | FN1 Nationwide House, Pipers Way, Swindon, SN38 1NW | DORMANT | – | £1 | – | |
| 8 | Nationwide Housing Trust Limited Nationwide House, Pipers Way, Swindon, SN38 1NW | DORMANT | – | £1 | – | |
| 9 | E-Mex Home Funding Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £24.22m | £3.59m | |
| 10 | Nok1 Limited Nationwide House, Pipers Way, Swindon, SN38 1NW | DORMANT | Upgrade to view | £3.5m | – | |
| 11 | The Mortgage Works (UK) Plc Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £2.76b | £1.27b | |
| 12 | The Derbyshire (Premises) Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £1 | – | |
| 13 | Nationwide Syndications Limited Nationwide House, Pipers Way, Swindon, SN38 1NW | ACTIVE | – | £85.49m | £10.83m | |
| 14 | Derbyshire Home Loans Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | Upgrade to view | £238.46m | £27.17m | |
| 15 | NLF1 Limited Nationwide Building Society, Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £1 | – | |
| 16 | Longwide Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | – | £100 | – | |
| 17 | Nationwide Healthcare Trustee Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | Upgrade to view | – | – | |
| 18 | Nationwide Pension Fund Nominee Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | Upgrade to view | – | – | |
| 19 | Nationwide Pension Fund Trustee Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | Upgrade to view | – | – | |
| 20 | Blazecourt Limited Nationwide House Pipers Way, Swindon, SN38 1NW | DORMANT | – | £1 | – | |
| 21 | Nationwide Covered Bonds LLP Nationwide House, Pipers Way, Swindon, SN38 1NW | ACTIVE | Upgrade to view | £-80m | £409m | |
| 22 | Grasscourt Partners LP Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | – | – | – | |
| 23 | Grasscourt GP Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | £181 | – | |
| 24 | Claycourt Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £100 | – | |
| 25 | Weathercourt Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £100 | – | |
| 26 | Honeycourt GP Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | £181 | – | |
| 27 | Beecourt Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £100 | – | |
| 28 | Waxcourt Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £100 | – | |
| 29 | Honeycourt Partners LP Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | – | – | |
| 30 | Piper Javelin Holding Company Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | Upgrade to view | £26.97m | – | |
| 31 | Piper Javelin No 1 Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | £26.97m | – | |
| 32 | NBS Ventures Management Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | £28.41m | £1.9m | |
| 33 | NBS Ventures Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | £42.17m | – | |
| 34 | NBS Cosec Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | DORMANT | – | £1 | – | |
| 35 | Home Propositions Limited Nationwide House Pipers Way, Swindon, SN38 1NW | ACTIVE | Upgrade to view | £-14.49m | – | |
| 36 | Oakfield Swindon Residents Management Company Limited Nationwide House Pipers Way, Swindon, Wiltshire SN38 1NW | ACTIVE | – | – | – |