prior to 1927: Crompton & Co. Ltd. CROMPTON PARKINSON LIMITED, PORTLAND HOUSE, BRESSENDEN PLACE, LONDON, SW1E 5BF, Company No. 00129649, Status: Active Date of Incorporation: 19/06/1913; Country of Origin: United Kingdom , Company Type: Private Limited Company; Nature of Business (SIC(03)): 7415 - Holding companies including head offices

1968 - Crompton Parkinson itself became part of the Hawker Siddeley Group