AMP Capital and 3i Infrastructure have agreed to acquire Danish sea rescue firm Esvagt.
The joint venture will complete the deal in September to buy the firm from Maersk Group.
AMP Capital said it would pay approximately £109m (€152.6m) for a 50% stake, with 3i Infrastructure taking an equal stake.
Esvagt, based in Esbjerg, provides emergency response and rescue services to the offshore oil and gas industry in Denmark and Norway.
AMP Capital said the company, which employs 800 staff, also has a growing UK presence, as well as offshore wind-service divisions.
Head of infrastructure equity Boe Pahari said Esvagt held leading positions in core Scandinavian markets where there were high barriers to entry.
“Its contracted revenue streams, unique operating model and market-leading margins mean it is expected to continue to deliver stable and predictable revenue,” Pahari said.
“The company is also well-positioned to replicate its success in overseas markets, as well as the offshore wind sector, which offers exciting opportunities for the business.”
Mitsubishi UFJ Trust and Banking Corporation, which has a 15% stake in AMP Capital, is a silent partner in GII, focused on solar photovoltaic generation facilities across Japan.