The $4T that businesses got handed in march 2020, aka 20% of all USA currency ever printed. Don't think they aren't still playing with it.
Interest rates are high now, so in theory investment in the stock market should be lower (and it was for a long time - see all the people investing in treasuries to get the great and safe returns)
While this is true, the "trickling out" timing doesn't appear to correlate very well stock market increases.
It's true that reverse repos have been decreasing and the stock market increasing. But the timing of movement seems too far out for there to be much of a causal link.
https://www.newyorkfed.org/markets/desk-operations/reverse-r...