|/ /1865||Glenboig Fireclay Company|
Formed by James Dunnachie with John Hurll and John Young.
|/ /1872||Star Fireclay Works|
Opened at Glenboig by James Dunnachie to compete with the Glenboig Fireclay Company.
|/ /1872||Glenboig Fireclay Company|
Partnership splits, James Dunnachie leaves.
|/ /1882||Glenboig Union Fireclay Company|
Formed by merger of the Glenboig Fireclay Company and James Dunnachies Star Fireclay Works.