ข้อสังเกตเกี่ยวกับความกว้างของตลาด

I wouldn't read too much into a single day's breadth. The overall trend for the AD line has been quite positive. One red day after a strong run is pretty normal.

I'm seeing similar things. The AD line definitely isn't painting a picture of broad-based strength, even with the SPX's recent performance. Might be a good time to be cautious.

Could just be some rotation out of the high flyers into more defensive plays. Not necessarily weakness across the board, but certainly a shift in sentiment for some sectors.