The breakdown of Greece's debt based on BIS data has been touted on many news sites over the last few days. But one needs to look at such stats with caution. They don't give a further breakdown of those large figures e.g. the USD 64 billion for Switzerland.
I'm not a journalist but I know for certain that the data on Switzerland is no longer correct, and even if it was still correct, it would be misleading.
It's obvious that the Swiss media wondered why they seem to have such a large exposure in Greece, since traditionally Switzerland has no special ties to Greece, nor are the big Swiss banks active there, so a Zurich-based newspaper digged into the stats a bit and provided the answer a few days ago.
The USD 64 billion figure is based mostly on Greek debt or claims owned by the EFG Banking group based in Geneva. EFG is controlled by the Greek billionaire family named Latsis (
http://en.wikipedia.org/wiki/Yiannis_Latsis).
EFG have moved their headquarters to Luxembourg some time ago, so don't be surprised to see a similarly high figure in the 2010 Luxembourg stats

.
Even if they still had the controlling interest in Geneva, it would be a Greek-controlled banking group based in Switzerland with exposure in Greece. Has hardly anything to do with Switzerland or actual Swiss investors.
Stats are stats. They're just compiled figures. You need to see the actual breakdown of the invidiual figures as Bloomberg has started to do with the France figure.
About "real" Swiss banks' exposure:
According to official data UBS and Credit Suisse held USD 1.9 billion in Greek sovereign debt. That's at the end of September last year. I doubt this figure has changed much. Swiss pension funds which amount to about CHF 600 billion last year held Greek bonds amounting to CHF 1.2 billion. That's hardly worth mentioning.
There are only two Greek government bonds listed on the Swiss exchange. They total CHF 1.15 billion and are most likely owned by Swiss investors. That's negligible.
All the details can be found here from this major Swiss newspaper (using Google Translate):
http://translate.google.com/transla...das-Schweizer-Geld/story/11177251&sl=de&tl=en
Original article in German here:
http://www.tagesanzeiger.ch/wirtsch...riechen-und-das-Schweizer-Geld/story/11177251
So far they're the only news outlet I know of (including Bloomberg, etc.) that got the USD 64 billion figure puzzle solved.