Early in my career, I had to babysit our FX quoting app through the July 2015 leap second.
And some things do trade 24/7 (though I wish they wouldn't, one auction per minute during US east coast business hours would be totally sufficient for most US markets).
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financial markets dont trade when the smears happen (NYE)
They can happen mid-year too. They usually don't for this reason, but they can.
Early in my career, I had to babysit our FX quoting app through the July 2015 leap second.
And some things do trade 24/7 (though I wish they wouldn't, one auction per minute during US east coast business hours would be totally sufficient for most US markets).
Depends on the market. Crypto and prediction markets wont stop.