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of Thornaby Iron Works, Stockton-on-Tees
Founded by William Whitwell
1860 Joseph Wright left the partnership of William Whitwell, Thomas Whitwell, Thomas Howard Head, Joseph Wright, and Joseph Ashby of South Stockton, iron manufacturers, under the firm of William Whitwell and Co.
Gurney Pease subsequently joined the partnership
1861 Company established.
1862 First iron made
1864 Also owned Thornaby Rolling Mills which started operation this year.
1866 See 1866 Cleveland Blast Furnaces for detail of furnaces
1873 Three new furnaces were built to replace the original ones
1889 Incorporated as a limited company.
1914 Iron manufacturers. Specialities: high-class bar iron and hematite iron for Siemens, Bessemer and other processes. Employees 750. 
1921 (sic) repurchased by the Whitwell family, with the support of Pease and Partners which wanted the 75 coke ovens connected with the Whitwell plant. The puddling furnaces, forges and rolling mills were closed.
1925 Mills closed