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Warning: This is not intended to be an exhaustive history of the companies listed, but an indication of the changes of ownership and the links between companies and directors in those companies. Only collieries, pits etc. in the North of England are shown - the companies may own other properties etc. outside this area and there may have been other changes of ownership etc. for which we currently do not have details.
Entries added or updated since 01 Jul 2008 are highlighted thus: 
| Company | Company Details | |
|---|---|---|
| Pallaflat Iron Ore Co. Ltd. | ||
| Palmer's Shipbuilding & Iron Co. Ltd. | ||
| Parkside & Birks Mining Co. Ltd. | ||
| Parkside Mining Co. Ltd. | ||
| Pease & Partners Ltd. | 1923, 1933, 1940, 1947 | |
| Pease, J. W. & Partners | ||
| Pelaw Main Collieries Co. | 1923 | |
| Pelaw Main Collieries Ltd. | 1933, 1940, 1947 | |
| Pelton Colliery Company | ||
| Pelton Colliery Ltd. (Owners of) | 1923 | |
| Pennington Mining Co. | ||
| Perkins, Charles & Partners | ||
| Plashetts Coal & Coke Co. Ltd. | 1923, 1933 | |
| Plashetts Coal Co. | ||
| Plenmeller Collieries Ltd. | 1923 | |
| Plenmeller Colliery (Owners of) | 1933 | |
| Preston Coal Co. Ltd. | ||
| Prestwick Coal Co. Ltd. | 1923 | |
| Priestman Collieries Ltd. | 1923, 1933, 1940, 1947 | |
| Priestman Whitehaven Collieries Ltd. | ||
| Prince Colliery Co. Ltd. | 1933, 1940, 1947 | |
| Princes Street Collieries (Shildon), Ltd. | 1947 |
