S&P 500 Sell-Off: 1 Investing Step to Take Right Now, and 1 Risky Move to Avoid

The past month has been rough for the S&P 500 (SNPINDEX: ^GSPC), with the index down around 4%. The index fell over 3% just in the last week, including a 4.4% decline on Nov. 5 — its largest since April 2025.
The sell-off stems from a combination of fears of an artificial intelligence bubble, interest-rate and inflation concerns, and geopolitical events and uncertainty. Only time will tell whether this sell-off marks the start of a correction or is just another routine dip. However, if we assume it’s the former, here are two steps investors should take right now and one they should avoid.
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Check in on your portfolio allocation
A good first step is checking your portfolio allocation to see how balanced your investments are. Major indexes like the S&P 500 and many popular ETFs are weighted by market cap, so they’ve become heavily concentrated in mega-cap tech stocks.
The Vanguard S&P 500 ETF (NYSEMKT: VOO), for example, holds 505 companies, but nearly 40% of them are in the tech sector. And that’s with companies like Amazon, Alphabet, and Meta Platforms technically being in non-tech sectors. Now is a good time to take a closer look and make sure you’re not overly concentrated in tech stocks. This is especially true if you’re investing in ETFs that overlap a lot at the top.
For example, many investors hold both the S&P 500 and a Nasdaq-100 ETF, such as the Invesco Nasdaq-100 ETF (NASDAQ: QQQM) or the Invesco QQQ Trust ETF. They have different underlying goals, so there’s nothing wrong with that, but they also share eight of their top 10 holdings:
Data source: Vanguard and Invesco. VOO percentages as of Sept. 30; QQQM percentages as of Nov. 5.
There’s nothing wrong with being concentrated in tech, but you don’t want your portfolio’s entire fate resting on one sector. If you find that you’re overconcentrated in tech (or any sector), consider using sector-specific ETFs to help make up ground in other sectors. For instance, if you’re lacking energy and financial stocks, the Vanguard Energy ETF and Vanguard Financials ETF could help fill the gaps.



