Operating in Australia, Canada, Europe and the Middle East, the company specializes in high-rise buildings, studio, high-end residential, mixed-use, education, health and civil infrastructure developments.

[12] In 2019, legal action was launched against the company by NHS Greater Glasgow and Clyde over problems in the construction and design of the Queen Elizabeth University Hospital.

[15][16] The inquiry is intended to examine "how serious problems relating to key building systems and infrastructure occurred, and what steps can be taken to prevent these in future projects".

[18] In August 2020, Multiplex was identified as the slowest payer among major UK contractors, taking more than 50 days on average to settle its bills.

Rather than pay fines and deal with the problems created by this and other shoddy building work, Multiplex put their local business into voluntary liquidation and left the New Zealand market.