The leading cruise line will need to come through with a strong financial update this week to reverse this year's slide.Last year was great for investors in cruise line stocks, but the water has been a little more choppy in 2025. Shares of Carnival (CCL 5.02%) (CUK 4.41%), the world's largest cruise line operator by revenue, have declined 16% so far this year. Smaller rival Norwegian Cruise Line (NCLH 4.35%) has fared even worse, with a 22% slide in 2025. Market cap leader Royal Caribbean (RCL 3.60%), meanw ...