Admiral was launched in 1993 and bought in 1999 in a management buyout backed by Barclays Private Equity. It floated in September at 287p, valuing the company at £711m. Today the shares were up 3p at 351p.
The float triggered windfalls averaging £37,000 each for 1,418 employees, out of a possible 1,616, based mostly in Swansea and Cardiff who owned shares through a trust. Engelhardt, who founded the firm, made almost £140m from his 19.6% stake.
The company said the trust scheme had been replaced with a performance-related bi-annual grant of free shares for staff.