Marshalls presented long-service awards to 28 staff who have completed 25 years service.
The company grew to become a major manufacturer of hard landscaping products and still has its roots locally.
Seventeen of the group are from the local area and all received a watch and certificate from chief executive Graham Holden.
They included Sally Morrell, based at Marshalls in Halifax, and she is the great-great granddaughter of founder Solomon Marshall.
She said the long service awards were an opportunity to gather Marshalls staff from across the UK to celebrate.
“I can’t believe I have been at Marshalls for 25 years, they’ve flown by,” said Mrs Morrell.
“I’m sure my great-great grandfather would have approved wholeheatedly of the occasion.”
The company was founded by Solomon in the late 1800s and he registered S. Marshalls & Sons Ltd in 1904 after becoming aware a living could be made from the quarrying business after working as a foreman at Pond Quarry, Brighouse.
He acquired his first land in 1910 at Southowram and the site at West Lane is still in use today and the company has grown to run sites across the UK and now has a workfoce of aroundr 2,000 .
Marshalls supplies the construction, home improvement and landscape markets. In 2011 it expanded into Europe and last year opened an office in China to serve the Asian market.