- Bagillt Oil Co. Ltd
- Barlow & Jeffs
- British Oil & Cannel Co. Ltd.
- Cambrian Oil Co.
- Canneline Oil Co. Ltd. (1861)
- Canneline Oil Co. Ltd. (1869)
- C.H. Earp & Co.
- Coppa Oil Co.
- Coppa Oil Co. Ltd.
- Crowther & Graesser
- Dee Oil Co.
- Dee Oil Co. Ltd. (1888)
- Dee Oil Co. Ltd. (1891)
- Edward Lavender & Co.
- Edwin Middleton
- E.G. Buttery & Co.
- Flintshire Oil & Cannel Co. Ltd.
- Frederick Lamb
- George Darlington
- George Henry Birkbeck
- G.F. Middleton
- G.F. Milthorpe
- Hardman & Sharett
- Haworth & Thompson
- Henry Darling
- Horner, Middleton & Co.
- Joseph Holmes
- Joseph Turner & Co.
- Leeswood Main Coal, Cannel & Oil Co. Ltd.
- London, Leeswood & Erith Mineral Oil Co. Ltd.
- Meadow Vale & Saltney Paraffin Oil Refining Co. Ltd.
- Mineral Oil Co.
- Mold Mineral Oil Co. Ltd.
- Ness, Griffiths & Jones
- North Wales Coal Oil Co. Ltd.
- Oil Company of Wales
- Padeswood Oil Co. Ltd.
- Plas-Yn-Mhowys Coal, Cannel & Oil Co. Ltd.
- Roger Jones & Co.
- Thomas Green & Co.
- Tryddyn & Milton Mineral Oil Co. Ltd.
- Tryddyn Oil & Coke Co. Ltd.
- W.B. Marston & Co
- Welsh Cannel Oil Co. Ltd.
- Welsh Coal & Mineral Oil Co. Ltd.
- Wilcox & Piercy
- William's Patent Mineral Charcoal & Oil Co. Ltd.
- W.W. Glover & Co.
