A Carnival stakeholder has got more onboard with the world's largest cruise company.

The Vanguard Group has taken a 5.4% interest in the Miami-based cruise giant with the ownership of 28.9 million shares, according to a regulatory filing.

The Arnold Donald-led company is listed in the New York and London stock exchanges.

The US Securities and Exchange Commission (SEC) requires that listed companies must file notice with the authority anytime a shareholder's interest hits 5% or more.