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UnitedHealth Group's are affecting the company's executives, investors, and the tens of millions of people who for health insurance and medical care.

Now they're also hurting one of the top gauges of the U.S. stock market, as UnitedHealth's plunging shares weigh down the Dow.

UnitedHealth is that makes up the Dow Jones Industrial Average, the powerful stock market index that some of the most important companies in the U.S. economy. Because of this, the Dow is viewed as a key bellwether that represents the overall health of the economy and markets at a glance.

A month ago, UnitedHealth was in the Dow — but now its shares have lost more than 50% of their value.

The Dow is up almost 5% in the same period. That's seemingly good news, especially as from the and by President Trump's sweeping and chaotic new tariffs.

But in comparison to the other major U.S. indices, the Dow's rally has been muted. The benchmark S&P 500, which tracks many more of the largest U.S. companies, is up almost 10% from a month earlier. The tech-heavy Nasdaq has soared even more, gaining almost 14%.

UnitedHealth is one of the largest companies in the world, and controls vast swaths of how Americans get and pay for health care. It employs ; processes payments and claims for hospitals and pharmacies; and owns the largest U.S. health insurer, UnitedHealthcare.

But for more than a year, the company has been facing mounting , including widespread consumer anger over denied claims and the high costs of U.S. health care. That fury after UnitedHealthcare's top executive, Brian Thompson, was shot and killed on a Manhattan street in December.

This week, UnitedHealth's business problems dramatically worsened: Its shares plunged on Tuesday after the company CEO Andrew Witty and suspended its 2025 financial guidance.

Then on Wednesday evening that the U.S. Department of Justice is investigating the company "for possible criminal Medicare fraud."

The company that it has "not been notified" by the DOJ "of the supposed criminal investigation." It also called the WSJ's reporting "deeply irresponsible" and said it "stand[s] by the integrity" of its Medicare business.

But investors are still spooked. On Thursday, UnitedHealth shares fell another 11%.

"The bad news is hitting fast and furious," analysts at CreditSights wrote in a research report on Thursday.

They added that UnitedHealth could possibly face "penalties in the multi-billion dollar area" from a potential DOJ investigation.

There seems to be a silver lining for the Dow, however. UnitedHealth's ongoing selloff means that its shares now play a in the overall index than they did a month ago.

Despite their plunge on Thursday, the Dow edged up for the day, closing up less than 1%.

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