The article claims that the oldest company in Kosovo was founded in 1999. I assume this is related to when it gained statehood, because it seems patently implausible that there are no institutions more than twenty years old.

The trouble is, all sorts of entries on this list predate the formation of the modern states in which they reside. Serbia's Apatin Brewery (1756) clearly predates its time as a part of Yugoslavia. What's the requirement for inclusion here?