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Move over Tesla, UnitedHealth is the battleground stock for retail traders this week as options trading explodes

UNH was the most-discussed ticker on r/wallstreetbets in the last week — and data from Robinhood suggests traders are mostly buyers.

Retail darlings like Palantir Technologies, Nvidia, and Tesla have had to make way for a new battleground stock on popular investing forums in the last week: embattled stock UnitedHealth.

After the shooting of its CEO last year, America’s largest healthcare insurance provider, UnitedHealth, has been under increased scrutiny — becoming a lightning rod for anger and debate over America’s healthcare system.

Now, the company’s sickly stock itself has become a flashpoint.

After plummeting by 50% between April 16 and May 16, UNH has attracted a legion of traders looking to profit from the wild swings in what used to be one of America’s most boring, stable companies, with data from SwaggyStocks — which tracks sentiment on sites like Reddit’s r/wallstreetbets — revealing that its the most-discussed ticker on the forum over the last seven days.

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Risk factors

Since reporting weak earnings in mid-April, UNH’s stock has been under pressure. On May 13, the company suspended its guidance, the same day CEO Andrew Witty abruptly stepped down for personal reasons, contributing to shares dropping another 18% in one day.

Some retail traders have taken swings at catching the falling knife by “buying the dip.” Those that did so post-Witty exit were burned just days later on May 15, when The Wall Street Journal reported that UnitedHealth was under investigation for possible Medicare fraud, triggering another 11% fall in the company’s equity. On that day there were more than 3,700 mentions of UNH on Reddit’s infamous investing forum, per data tracked by SwaggyStocks.

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So, why has UNH grabbed retail traders’ attention?

The simplest answer is that it’s been super volatile, and traders with short-term investing horizons like the opportunity that volatility brings, even if it also means a lot of risk. Data from Bloomberg confirms that a lot of action has spilled over into the options markets, with put and call volumes spiking 820% in the five days leading up to May 19, relative to the previous week of trading.

But, of course, plenty of stocks are volatile, so why has UNH captured the retail zeitgeist so strongly?

One explanation might be that UnitedHealth’s business — or perhaps more accurately, criticisms thereof — is increasingly prominent in internet culture, and therefore the minds of retail traders. Luigi Mangione, the prime suspect in the killing of UnitedHealth’s CEO Brian Thompson, has become something of a folk hero for people railing against corporate greed and America’s health system.

Could it be that Main Street investors have decided to put their money where their mouth is, betting against the American healthcare machine?

It’s a nice theory, but it doesn’t seem to quite add up. Options volumes jumped modestly around the time of Brian Thompson’s murder, and on Luigi Mangione’s subsequent arrest five days later in December of last year, but they didn’t do anything like what we’ve seen in the last week when the UNH price action was much more extreme. If this were a counterculture “Main Street vs. Wall Street” moment, it feels like the most plausible time for it to have happened would have been four to five months ago.

Furthermore, while it’s true that bets against the company have risen, so have bullish trades. Indeed, the put/call volume ratio for the last five days of trading is just 0.68 — a fairly unremarkable figure that means traders are still buying more calls than puts.

Data from Robinhood all but kills the idea that the spike in trading is politically motivated, with Robinhood’s tracking of retail traders revealing that they have mostly been bullish on UNH stock. Customers have been net buyers in each of the last 10 trading sessions.

(Sherwood Media is an editorially independent subsidiary of Robinhood Markets Inc.)

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A spate of large insider buys — most notably by the company’s new CEO, Stephen Hemsley, who reportedly spent $25 million acquiring UNH shares — helped to turn the stock around on Monday.

More likely, then, it seems that UNH was simply a candidate for old-fashioned dip-buying: an historically stable, (now) well-known company that’s hit a rough patch. Of course, the dip can always resume dipping.

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Marvell Technology jumps after raising sales guidance for the next two years

Marvell Technology’s robust outlook is carrying the day after the custom chip designer’s Q4 results came in only fractionally above estimates.

For the final quarter of its fiscal 2026, the custom chip designer reported:

  • Net revenue of $2.22 billion (estimate: $2.21 billion).

  • Adjusted net income per share of $0.80 (estimate: $0.79).

For Q1, management offered guidance for:

  • Net revenue of $2.4 billion, plus or minus 5% (estimate: $2.28 billion).

  • Adjusted net income per share of $0.79, plus or minus $0.05 (estimate: $0.75).

During the conference call, management said that full-year sales for fiscal 2027 would be “approaching $11 billion,” up from its guidance of “approximately $10 billion” in December.

“We expect Marvell’s overall revenue in fiscal 2028 to grow close to 40% year over year, reaching approximately $15 billion, roughly $2 billion higher than the outlook we provided in our December earnings call and driving our non-GAAP EPS to well over $5,” CEO Matt Murphy said on the conference call.

Wall Street estimated Marvell’s full-year sales for fiscal 2027 (roughly calendar year 2026) would be a little over $10 billion and a little less than $13 billion for the following year, roughly in line with the firm’s previous guidance.

Shares extended gains to 15% after this boost to the outlook.

There had been massive uncertainty about the status of Marvell’s relationships with its two biggest hyperscaler clients going forward, with some analysts and media reports indicating that the firm was going to lose some of this business and others saying these custom chip programs remain on track.

“In addition to our strong results and outlook, our design wins in fiscal 2026 hit an all-time record, which we expect will continue to fuel our future growth,” Murphy said in a press release. The reference to “design wins,” in concert with the raised guidance, appear to be alleviating some of traders’ concerns about customer migration.

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US crude oil hits highest price since 2024 as Iran war roils markets

US crude oil climbed by more than 8.5% in afternoon trading Thursday, pushing the price of benchmark West Texas Intermediate crude above $81 at points, a level it hasn’t seen since the summer of 2024.

The price spike is hammering energy-sensitive stocks like airlines and consumer staples, and driving outperformance among oil and gas companies. Energy is already the S&P 500s top-performing sector by far in 2026.

In a March 5 note, analysts from S&P Global Energy CERA wrote:

The scale and duration of a price spike will depend on how much oil is kept off the market — and for how long — due to danger in the strait, higher shipping insurance rates or damaged Gulf infrastructure.”

US prices at the pump are already surging, rising an average of $0.27 to $3.25 per gallon, a 9% rise in just a single week, according to new data collected by AAA.

In a March 5 note, analysts from S&P Global Energy CERA wrote:

The scale and duration of a price spike will depend on how much oil is kept off the market — and for how long — due to danger in the strait, higher shipping insurance rates or damaged Gulf infrastructure.”

US prices at the pump are already surging, rising an average of $0.27 to $3.25 per gallon, a 9% rise in just a single week, according to new data collected by AAA.

+27¢ ⛽

What a difference a week and a war make.

The average price per gallon for gasoline in the US shot up $0.27 from last week to $3.25, a 9% increase, according to new data from AAA, as escalating tensions in the Middle East push oil prices higher.

Higher fuel costs are rippling through markets: the Consumer Staples Select Sector SPDR Fund is down 2%, and bargain retailers like Dollar General and Walmart are also trading lower.

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Nvidia falls on report of US government drafting regulations restricting AI chip exports

According to Bloomberg, the Trump administration will propose regulations that would require US government approval for AI chip shipments worldwide, expanding existing export controls that currently apply to roughly 40 countries.

Nvidia and AMD both dropped on the news that the government would essentially act as a “gatekeeper for the AI industry,” though approval processes will vary and ramp up in complexity with the size of the order, and would only require the involvement of the host country’s government “for truly massive deployments,” Bloomberg’s sources said. Bloomberg added that exports for the largest projects would be approved only for US allies that make stringent security commitments and “matching” investments in American AI, though the draft rule does not specify what that investment ratio would be.

Earlier this week, Bloomberg reported the US is also considering putting a cap on the number of AI chips that Chinese firms can purchase, though Nvidia CFO Colette Kress mentioned on the company’s Q4 earnings call that it does not yet know whether it will be able to ship any AI chips to China regardless of US regulations.

Earlier this week, Bloomberg reported the US is also considering putting a cap on the number of AI chips that Chinese firms can purchase, though Nvidia CFO Colette Kress mentioned on the company’s Q4 earnings call that it does not yet know whether it will be able to ship any AI chips to China regardless of US regulations.

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