Loads of reasons... 10 Year is over 3%. In recent days, many tech/semi companies have issued underwhelming guidance forecasts. And energy has everyone freaked out with some "experts" suggesting we can see Nat Gas hit $20! And lastly, there is growing sentiment that the consumer is going to become steadily pinched by continued inflation (Food, Gas, Housing), and will therefore cutback on spending on non-vital items.
The P/E for the S&P is already slightly above historical levels...and with forecasts coming down and the rest of the stew noted above, it seems quite difficult to see how the market can continue to rise. Tom Lee still seems convinced the S&P will be minimally at 4,400 by year-end, and possible as high as 4,800. The dude is one of the most respected quants on the street..but man, I just don't see how the market could get to those levels.
And I haven't even mentioned the impact from the Fed... with continued rate hikes and their more aggressive Quantitative Tightening program that starts Sept 1st!