Auckland aviation business Airwork is being tipped to announce plans to list on the share market tomorrow morning.
A market source said a prospectus had already been shopped around to potential institutional investors.
According to its website Airwork specialises in helicopter engineering and support, helicopter leasing and charters and fixed wing operations, charter and engineering.
The company began operating out of Wellington in 1936 and now runs a head office out of Mechanics Bay in Auckland.
Airwork was previously listed in the 1970s at which time Brierley Investments built up a substantial shareholding.