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UnitedHealth, one of the worst S&P 500 stocks in 2025, is having a bigger Dow Jones impact

UnitedHealth Group, a major player in the healthcare insurance sector, has experienced significant volatility recently. The stock, traditionally seen as stable, has faced downward pressure following its first-quarter earnings report and a subsequent guidance cut on April 17, resulting in a substantial price drop. Further complicating matters, the stock saw another sharp decline on Tuesday after its CEO stepped down and the company withdrew its full-year guidance.

This sell-off has pushed UnitedHealth’s stock price to levels not seen in approximately five years. The stock has fallen significantly year to date, making it one of the poorer performers within the S&P 500.

So, what’s driving this decline? UnitedHealth operates through two main segments: UnitedHealthcare, focused on health insurance premiums, and Optum, its health services arm. While both segments have shown year-over-year growth, the company is currently grappling with increased costs and investigations by the Department of Justice concerning its Medicare Advantage billing practices.

In a press release on May 13, UnitedHealth indicated a planned return to growth in 2026. However, the company suspended its full-year outlook due to accelerating care activity across various benefit offerings and higher-than-anticipated medical costs for new Medicare Advantage beneficiaries. This uncertainty surrounding the company’s business model has fueled investor concerns, contributing to the steep sell-off.

For traders and investors, understanding the impact of UnitedHealth’s performance goes beyond just the stock itself. Its movement significantly affects the Dow Jones Industrial Average. Unlike the market-cap-weighted S&P 500, the Dow is price-weighted. This means a stock’s nominal price, not its market capitalization, determines its influence on the index. UnitedHealth, even with its recent decline, remains a large company, and its past position as a heavily weighted component in the Dow means its downward trajectory has had a noticeable impact on the index’s performance.

Dissecting index movements is crucial. While mega-cap tech stocks heavily influence the S&P 500, specific high-priced stocks like UnitedHealth can disproportionately affect the price-weighted Dow. Recognizing the differences between how various indexes are weighted is essential for filtering market noise and making informed trading and investment decisions today, May 20, 2025.

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