[totally]

Would they also circuit break on 7% increase, in order to give people time to come back from positive feelings?

[anarazel]

Looks like it's also on increases, yes:

https://www.sec.gov/oiea/investor-alerts-bulletins/investor-...

[mattkrause]

Limit-up/Limit-down applies to individual equities that are moving strongly in either direction.

The market-wide circuit breakers, which triggered this morning, only apply to declines.

[evanpw]

Single-stock volatility halts happen in either direction, but market-wide circuit breakers only happen on down moves.

[andrewla]

The limits for individual stocks are up/down limits, but the market-wide halts are only for declines.

[airstrike]

No, because if the market is up 50% because we humanity has discovered an immortality serum, nobody is panicking.

There's no downside in great news (other than the possibility of a quick reversal thereafer...)

[throwsprtsdy]

Piling in on the buy side because of a fear of missing out counts as panicking.

[codeulike]

Now thats a really good question.