Holland America Line was founded in Rotterdam in 1873 as the Nederlandsche-Amerikaansche Stoomvaart Maatschappij — the Dutch-American Steamship Company — and spent its first century as a transatlantic liner line, carrying hundreds of thousands of emigrants from Europe to North America; its first ship was also named Rotterdam, a name the fleet still carries. The line offered an early vacation cruise as long ago as 1895, but cruising only became its whole business in the later twentieth century, and it has been part of the Carnival group since 1989. The fleet below is the most traditional in style of the large mainstream lines: mid-sized, understated ships built in steady classes. The Rotterdam-class pair sit at about 61,000 GT, four Vista-class ships at about 82,000 to 83,000 GT, and the Signature and Pinnacle classes take the fleet to 86,273 GT and just under 100,000 GT respectively, topped by Rotterdam at 99,935 GT.
The fleet — 11 ships in this directory
Sources: https://encyclopedia.thefreedictionary.com/Holland+America+Line#cite_ref-30, https://maritime-executive.com/article/holland-america-line-history-distinction-innovation-and-growth