> That prompted Nasdaq to cut the entire trade on Wednesday and the exchange confirmed that the loss accounted for all of the exchange’s own default fund of €7m and swallowed €107m, or two-thirds, of its €166m mutual default fund that clearing house members must contribute to.
So a single, one person trader was able to basically bankrupt the Nasdaq insurance fund. This fund is supposed to cover all of the margin trading misfortunes but a single guy/position took it all away.
This means that the Nasdaq (and probably any other exchange) is not ready for a volatility event. In the case of extreme volatility, the Nasdaq insurance fund will be 0. Counterparties in derivatives won't get paid, and potentially the mutual funds/etfs/other structures depending on these derivative trades will collapse.
The next financial crisis is just one trade away.
Edit: re-reading and searching further, it looks like the fund that was depleted was not that of the Nasdaq but rather a mutual fund for several exchanges. The Nasdaq had only 7m euros. What a joke.