[quote=“Mr He”]Oh well, just a word of warning when it comes to volatile stocks.
I don’t get why their PE is so low. Does the world suffer from overcapacity of oil tankers?[/quote]
[Shipping] market volatility and corporate-future uncertainty, mostly. At the moment, oil-tanker rental rates are sky-high; their historical dividend is about 1/4 of what it is now. Also, their long-term lease contract is expiring in October; the shareholders had to vote to continue the corporation a few weeks ago, and there is no sign of what the company will do once the lease finishes in October. The link I provided has a general rundown (not sure who put the site up, so be wary of the information on it). Also, the bank loan terms for their tankers specified that the bank must approve dividend payouts during the last two quarters of the loan – i.e., the next two quarterly dividends might not be paid.
OTOH, in less than a week I’ve made more than 10%. 
Pure luck, I know.
Edited Monday evening to note: now it’s up 18%. 