S&P 500 market breadth deteriorates to weakest since March

Approximately 60% of S&P 500 stocks are now trading below their 100-day moving averages, marking the weakest market breadth since March.
The deterioration shows that weakness beneath the headline index has become increasingly broad even as parts of the market remain near elevated levels.
Narrowing participation can make the index more dependent on a smaller group of large stocks and represents a potential warning sign if breadth continues to deteriorate.