The facade fabricator and installer has worked on a string of iconic projects including Centre Court at Wimbledon and the Royal Ascot grandstand.
Hightex is closing the UK office in Hampshire as part of a centralisation programme which will see global operations directed from Bavaria, Germany.
UK chief David Walker is being made redundant from his role as director of business development along with five members of staff.
The firm said: “The Board thanks David Walker for the work and time he has committed to the Company over many years and regrets that it was not possible to find an alternative role for him in Germany.
“At the same time, five other employees of the UK office will also be leaving the company.”