With S&P 500 near record highs, it’s time to reconsider the set-it-and-forget-it strategy, some experts say

• Even amid a federal government shutdown, the S&P 500 climbed to a new all-time high on Thursday.
• Yet investors who double down on that index risk overconcentration in big company names.
• Here’s how experts say to diversify to avoid those risks.

The S&P 500 index closed at a new all-time high on Wednesday amid a federal government shutdown. It rose to a new intraday high early Thursday.

Prior to that, the index — which is focused on large-cap U.S. equities — had risen almost 90% since the equity bull market began three years ago, thanks in large part to new AI developments, Morgan Stanley Wealth Management noted in Sept. 29 research.

Source: https://www.cnbc.com/2025/10/02/sp-500-set-it-and-forget-it-strategy.html