According to MarketWatch, in the article "ETFs have crushed Wall Street’s go-to stock-market indicator" on www.marketwatch.com (https://www.marketwatch.com/story/how-etfs-crushed-wall-streets-favorite-stock-market-indicator-39940760), the S&P 500’s 200-day moving average may no longer work as cleanly as a benchmark for market trend. The piece says the spread of ETFs has altered the signal, reducing the indicator’s usefulness as a simple read on market direction. The article was originally published on 2026-03-28 at 17:04:00 UTC.
For active traders, this matters because many short-term and swing decisions still lean on widely watched technical levels like the 200-day average. If that signal is less effective, it can affect how traders interpret trend strength, regime changes, and risk-on or risk-off conditions across equity indexes and related assets. The practical takeaway is not that the indicator is irrelevant, but that its context may have changed as ETF flows have become a larger part of market mechanics.