Why the stock market may sell off even more in January

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- Getty Images
- Getty Images

The S&P 500 SPX is weighted by market capitalization, which means that the largest three holdings of the SPDR S&P 500 ETF Trust SPY — Apple Inc. AAPL, Microsoft Corp. MSFT and Nvidia Corp. NVDA — make up 20.5% of its portfolio. This has been a good year for the stock market overall, but it might be interesting to look deeper at the breadth of the market.

This year-to-date chart below shows total returns (with dividends reinvested) for the S&P 500 and for the S&P 500 Equal Weight Index XX:SP500EW through Thursday:

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- FactSet
- FactSet

Through Thursday, the S&P 500 had pulled back 2.7% for December. That isn’t anything to complain about, considering that the U.S. large-cap benchmark index was still up 24.7% for 2024. But the S&P 500 Equal Weight Index was down 7.1% for the month, and its return for 2024 was less than half that of the cap-weighted index. One-third of stocks in the S&P 500 actually showed negative total returns for 2024 through Thursday.

And the December decline has been a broad one, with 89% of the S&P 500 showing negative returns.

On Wednesday, the Federal Open Market Committee reduced the federal-funds rate by another 25 basis points to a target range of 4.25% to 4.50%. Stock and bond markets typically are expected to react favorably to interest-rate cuts, but Christine Idzelis explained why stocks and bonds fell, and why volatility increased, on Wednesday after the Federal Reserve’s rate cut.

Michael Brush analyzed broad market patterns to conclude that the two-year stock-market party was nearing an end, and why the declines could accelerate in January.

And Vivien Lou Chen explained how the trading action in U.S. Treasury bonds has been signaling another leg down for stocks.

More pain: Nvidia stock is in a correction. Microsoft’s CEO may have just said something very worrying.

And hope: Hedge fund strategist flags biggest concern for markets in 2025 — and offers ideas for shelter