The private equity firm which owns half of Norwegian Cruise Line has postponed a planned $500 million initial public offering, according to reports in the United Kingdom.

Apollo Global Management reportedly delayed the start of official talks with investors until stock markets calm down in the wake of the Japanese earthquake and tsunami.

Apollo also cruise brands Regent Seven Seas Cruises and Oceania Cruises.

Decisions on the initial public offering continue to be made “day-by-day,” according to the Times newspaper.

Apollo hopes to offer shares at between $18 and $20 each and raise $494 million (£307 million).