Comment by butifnot0701

As others have noted, SK is not private - although it's hard to say whether it's private or public as it's more of group of companies. But many of larger companies including Holding Co is private. The company in this article's context is SK Hynix which is second largest (or third?) on Korean exchange. Just like other conglomerates in this country, SK Group runs many other businesses including bio, finance, telecom, etc.