Okay, on 31 Aug 2012, the KOSPI closed down at 1905.12, and on the same day NCsoft shares closed down at 252,500 KWon.
Yesterday, the KOSPI closed at 1990.33, and NCsoft ended at 256,000 KWon.
Which mean that over the same period of time, Korea as a whole has increased by 4.77%, and NCsoft has grown by 1.39%.
That really doesn't tell us very much in and of itself, but if we go back just one more day, we get closing prices on the KOSPI of 1906.38 and NCsoft at 254,500.
This tells us that the change from before the CoH closure announcement was Korea at 4.40% growth and NCsoft at 0.59%
Such a limited set of data really doesn't tell a huge story, however we know that on the day of the announcement NCsoft dropped, then bounced back by Sep 7th to a high they hadn't seen since June 25th, and has been bouncing around a steadily decreasing figure since then. NCsoft is higher now than they were through most of the month of August, but while Korea as a whole has bounced back nicely from a dip around the 5th of Sept (climbing ever since, with fluctuations), NCsoft hit a peak on the 7th and has been seeing a downward trend almost exactly the opposite of the KOSPI.
So, what does all of this mean?
Honestly, I don't know. However it is not an unreasonable premise to suggest that because even though GW2 sales have been healthy, NCsoft is still going down, while Korea as a whole is trending upwards, then the negative press being generated off the back of the CoH closure announcement is actually hurting their bottom line.