It is hard to say there is extreme bullishness now. There was extreme bearishness for a long time, and now that appear to have lifted so people seem more inclined to invest some money. Perhaps by comparison it looks very bullish to where we were but I don't see any frenzy of people saying a major bull market is here or coming. I guess one indication of extreme bullishness would be high levels of margin. Anyone know where such figures can be found?
I believe the investor sentiment they are talking about is for the direction of the overall market . I agree its only one indicator but there are plenty of smart people like Jeremy Grantham who think we could be near a market top . Of course individual stocks that have run like NFLX and some of the cloud stocks are more dangerous to hold than a AMGN or stocks that have not doubled and tripled in past year. imo.