Record rally
Barring a hefty pullback into the close, today will go down as the best-ever day for small-cap stocks. Never before has the Russell 2000 rallied so much on a day it scored an all-time high. The only date since 1979 when it jumped more than 3% at a record high was February 29, 2000, which obviously isn't a great precedent.
Using total return (including dividends), it gets a little easier to see big gains, but even then today would go down as the greatest of all time. Below, we can see returns in a small-cap total return index when it jumped 2.5% or more at an all-time high.

Shorter-term returns were pretty good. Longer-term returns couldn't exceed random.
