Similarity between Swissco Holdings and Centurion Corp

Swissco Holdings's ship chartering business and Centurion's dormitory assets are both businesses with risks that are far lower than other businesses like ship building or construction because Singapore faced a tight labour supply.

And businesses that are passive income yielding are more attractive due to their defensiveness in nature. 

Both Swissco and Centurion share the same rental model that do not require much labour supply and therefore proved to be attractive. This translates to the increase of their share prices.