stock halts

if news pending and no particular news if stock it will drop immediately a big number, never buy if you hear this situation and all existing position will be a loss, example UUU went up 13.8 and news pending, after company said no news, when open again it dropped under 7

T1 halt - release  news (more common)

T12 halt - require additional information  needed (stock exchange requests)

LUAD halt -  change 10% in 5 min, or 10 min

NYSE halts

https://www.nyse.com/trade-halt-current

NASD halts
https://www.nasdaqtrader.com/trader.aspx?id=TradeHalts

Halt codes
http://www.nasdaqtrader.com/Trader.aspx?id=TradeHaltCodes