WHO MANAGES WHO IN THE CRUISEWORLD:

It is an misunderstanding that there are so many cruiselines as you think.  Because some cruise holdings manage more than one cruise company.
The big 4 are Carnival Corp.-Royal Caribbean Int. -Norwegian Cruise Line and MSC (private owned).

*Remarks:
Only listed cruise holdings who manages more than one cruiseline.

CRUISE HOLDING : OWNERSHIP OFF:
ALL DISCOVERY CRUISING Ceased operation 2016
  HEBRIDEAN ISLAND CRUISES
Classified by a separate company
AMERICAN CRUISE LINES Inc.  
  AMERICAN CRUISE LINES
  PEARL SEAS CRUISES
APOLLO MANAGEMENT  
  NORWEGIAN CRUISE LINE 13,4%
  NCL-AMERICA 100%
ARTEMIS SA - Frankrijk  
  TAPIS ROUGE  100%
  Comp. des Iles du Ponant 100%
CARNIVAL CORPORATION & PLC.  
  CARNIVAL CRUISE LINES
  CUNARD
  COSTA CROCIERE
  FATHOM
  HOLLAND-AMERICA LINE
  SEABOURN CRUISES
  P&O CRUISES (UK)
New name: CARNIVAL UK
  P&O AUSTRALIA
  PRINCESS CRUISE LINES (USA)
  AIDA CRUISES (GERMANY)
GENTING HongKong  
  CRYSTAL CRUISES (100%)
  CRYSTAL YACHT CRUISES(100%)
  CRYSTAL RIVER CRUISES(100%)
  DREAM CRUISES(100%)
  STAR CRUISES (100%)
  NORWEGIAN CRUISE LINE (7,8%)
LOUIS CRUISE LINES  
  LOUIS CRUISE LINES
  LOUIS HELLENIC
  CELESTYAL CRUISES
  GOLDEN STAR/SUN  100%
NIPPON YUSEN KAISHA  
  NYK CRUISES
NOWEGIAN CRUISE LINE Holding  
  NORWEGIAN CRUISE LINE(78,3%)
  OCEANIA CRUISES 100%
  REGENT SEVEN SEAS 100%
ROYAL CARIBBEAN INTERNATIONAL  
  CELEBRITY CRUISES (100 %)
  ROYAL CARIBBEAN
  PULLMANTUR (49%)
  AZAMARA CRUISES (100%)
  CDF Croisieres de France (49%)
  TUI-Cruises Germany (50%)
  SkySea Cruises- China  (35%)
TUI /First Choice Holidays Plc.-                                    
  Thomson - UK 100%
  Hapag Lloyd - Germany 100%
  Quark Expeditions sold aug.2017
  TUI-Cruises Germany (50%)
SAGA SHIPPING - UK  
  Saga Cruises
  Spirit of Adventure

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last update: Aug.16-2017