The OTCQX Best 50 is the first ever annual ranking of strong performing US and international companies.
The ranking was calculated based on an equal weighting of one-year share price performance and average daily dollar volume growth in the previous calendar year.
All companies in the 2015 OTCQX Best 50 were traded on OTCQX on Dec 31, 2014.
Nautilus’ chief executive officer Mike Johnston said: “We are delighted to have been named in the OTCQX Best 50.
“This is a reflection of the hard work that our team has put in over the last year and our focus of delivering results for our shareholders.
“We remain committed to maximising shareholder value by achieving our objective of developing the world’s first commercial high grade seafloor copper-gold project and launching the deep water seafloor resource production industry in 2018.”