Why did GLBSE close? I went to https://glbse.com/ and see it is closed. It was a stock exchange for shares of companies denominated in Bitcoins.

Does anyone know why it closed?
At this point in time only one person, Nefario, knows for sure why GLBSE closed.  He was the one who had the power to close it, and he did so, without giving any public explanation.

Everything else is either hearsay or speculation.