[ckdarby]

There is no market rule that requires a single stock from not being halted.

Please show me a one day 99% drop on a stock. Trading would be halted well before that to prevent manipulation or errors.

[badfrog]

The rules are covered here: https://www.sec.gov/oiea/investor-alerts-bulletins/investor-...

LULD is the one that applies to single stocks. It only results in a five minute halt, as I said.

The market-wide circuit breaker can halt the entire market for a full day, but only in response to a 20% move in S&P500, not a single stock.

[saimiam]

If it were a straight drop of 99% - say it is trading at $100 at tick_1 and at tick_2, it is trading at $1, trading will be halted at point which happens to be after a 99% drop. In reality, stocks gap downwards in a series of shallow steps which are unlikely to be 99% in one tick.

More info on the 10% trading halt rule: https://www.nasdaqtrader.com/Trader.aspx?id=TradeHalts