Top US Stock Losers Today (December 10, 2025): Why Polestar, AeroVironment, Aegon and Other Names Are Sinking

US stocks are mostly treading water ahead of tonight’s Federal Reserve decision — but beneath the calm surface, a handful of individual names are getting hammered.

As of Wednesday afternoon, December 10, 2025, major indexes are roughly flat: the Dow hovers around 47,650, the S&P 500 near 6,841, and the Nasdaq modestly lower as traders wait to see whether the Fed delivers a widely expected rate cut and, more importantly, how hawkish Chair Jerome Powell sounds. ^[1]

Against that relatively muted backdrop, some high‑beta growth stocks, EV names, insurers and resource plays have dropped between 5% and more than 20% intraday — topping today’s US stock losers lists.

US Market Snapshot — December 10, 2025

Indices: Stocks are essentially on “pause”: the Dow and S&P 500 are fractionally higher to flat, while the Nasdaq is slightly in the red as big tech and chip names like Nvidia and Intel slip. ^[2]
Macro narrative: Futures and live trading reflect caution ahead of the Fed’s final policy decision of the year, with markets pricing roughly a 90% chance of a rate cut but bracing for a potentially hawkish message on inflation. ^[3]
S&P 500 internals: Within the index, the biggest decliners are relatively modest moves — for example Uber (-4.5%), DoorDash (-3.7%), T. Rowe Price (-3.4%) and Microsoft (about -2.3%) top today’s S&P 500 losers list. ^[4]

In other words, this is not a broad-based sell‑off. The real pain is concentrated in a set of individual stories.

Top 20 US Stock Losers Today

On TipRanks’ “Stock Market Losers Today” scan for US markets (intraday, Dec 10, 2025), the steepest percentage decliners look like this: ^[5]

PSNY – Polestar Automotive Holding UK: -23.5% to about $14.00
AVAV – AeroVironment: -9.6% to about $254.44
AEG – Aegon: -9.4% to about $7.14
MOB – Mobilicom Ltd. ADR: -8.3% to about $7.31
NNNN – Anbio Biotechnology Class A: -8.2% to about $31.00
PPTA – Perpetua Resources: -8.1% to about $24.41
UEC – Uranium Energy: -7.2% to about $12.95
QUBT – Quantum Computing Inc.: -6.8% to about $12.31
VG – Venture Global, Inc. Class A: about -6.6%
CRDO – Credo Technology Group: about -6.5%
BE – Bloom Energy: about -6.3%
RGTI – Rigetti Computing: about -6.2%
TMC – TMC the metals company: about -6.2%
LYFT – Lyft: about -6.3%
ONDS – Ondas Holdings: about -5.6%
DNLI – Denali Therapeutics: about -5.7%
MIAX – Miami International Holdings: about -5.7%
UUUU – Energy Fuels: about -5.5%
CART – Maplebear (Instacart): about -5.3%
UNFI – United Natural Foods: about -5.4%

These figures are intraday and may shift into the close, but they outline the key pressure points for US equity traders today.

Let’s dig into what’s behind the biggest moves — and what analysts and forecasters are saying today.

Polestar (PSNY): EV Maker Hits a Fresh Low as Funding Fears Deepen

Move: Polestar is today’s standout loser, down roughly 23% to about $14 and hitting a new 52‑week low in US trading. ^[6]

What’s happening today?

MarketBeat reports that Polestar shares set a new 1‑year low during mid‑day trading on Wednesday, underlining how persistent the selling pressure has been. ^[7]
GuruFocus notes that the stock is down more than 16% in today’s session alone in heavy trading, flagging “a challenging period” for the company’s shares. ^[8]
A fresh Seeking Alpha analysis published today argues that “Polestar remains in a precarious financial position” despite a recent reverse split and ongoing efforts to secure new funding, and maintains a bearish stance on the stock. ^[9]

TipRanks also highlights “structural changes” and volatility around the name, emphasizing that investors are reacting to concerns about dilution, financing and execution. ^[10]

The deeper backdrop

Polestar’s troubles aren’t new — today’s plunge is more of a culmination than a surprise:

Delisting risk: Reuters reported in late October that Nasdaq warned Polestar about potential delisting after its share price fell below the $1 threshold, with the stock already down more than 90% from its 2022 debut. ^[11]
Reverse split & ADS change: In mid‑November, Polestar announced a plan to change its US depositary share ratio from 1:1 to 1:30, effectively executing a reverse split to regain compliance. That announcement alone triggered a double‑digit percentage drop. ^[12]
Weak results: Recent quarterly numbers missed expectations on both revenue and gross margin, prompting about a 15% decline on the day of the release and pushing the stock closer to its prior 52‑week low. ^[13]

Forecasts and analyst tone

Today’s Seeking Alpha piece essentially frames Polestar as a high‑risk turnaround with heavy cash needs, arguing that the current equity value still doesn’t fully reflect funding risk and possible further dilution. ^[14]
Reuters has previously highlighted that Polestar has had to negotiate amendments with lenders to stay within debt covenants, and its shares have fallen more than 93% since listing, underscoring market skepticism. ^[15]

Bottom line: Today’s slide reinforces a bearish narrative: without clearer visibility on long‑term funding and profitability, many institutional investors appear to be using rallies to reduce exposure rather than buy the dip.

AeroVironment (AVAV): Guidance Reset and Valuation Jitters Hit Drone Star

Move: Drone and defense systems maker AeroVironment is down about 9–10% to the mid‑$250s, placing it second on today’s US losers list. ^[16]

What’s driving the sell‑off?

The stock is digesting fresh earnings and guidance:

A TIKR Markets blog today notes that AeroVironment “fell more than 3% in pre‑market trading” after its latest earnings release missed expectations and came with a lower outlook, framing the move as investors recalibrating to more modest growth. ^[17]
The Motley Fool reported last night that the company beat revenue estimates but cut its full‑year fiscal 2026 guidance, which sent the stock lower in after‑hours trading as investors reacted to the forward‑looking commentary. ^[18]
MarketBeat and Zacks coverage this week highlighted that AVAV has logged single‑day declines of 7–8% as investors weigh the combination of lofty expectations, rich valuation and a guidance reset. ^[19]

Valuation & performance context

Despite today’s drop, AeroVironment has been a huge long‑term winner:

A recent Nasdaq article points out that AVAV has delivered roughly 200% returns over three years, handily beating the S&P 500 on a total‑return basis. ^[20]
However, a separate analysis using discounted cash‑flow estimates suggests the stock may be overvalued by over 40%, even after the pullback, reinforcing the idea that expectations were extremely high going into earnings. ^[21]

Analysts are far from giving up on the name:

Needham today reiterated a “Buy” rating with a $450 price target, implying substantial upside from current levels. ^[22]
RBC Capital recently maintained an “Outperform” rating, trimming its target from $440 to $400 but still signaling confidence in the long‑term drone and defense demand story. ^[23]

Bottom line: AVAV’s slump looks like a classic high‑flyer earnings reset: fundamental demand for drones remains strong, but guidance, valuation, and profit‑taking are combining to drag the shares sharply lower today.

Aegon (AEG): Strategic US Pivot Rattles Insurer’s Shareholders

Move:Aegon ADRs, which trade in the US under ticker AEG, are off about 9.4% to roughly $7.14, ranking third among US losers. ^[24]

Big strategic news today

The catalyst is clear: Aegon’s Capital Markets Day 2025 and a bold restructuring plan.

Aegon announced that it intends to move its head office and legal base from the Netherlands to the United States and adopt the Transamerica name, aligning the group’s identity with its largest business. ^[25]
The shift is part of a multi‑year restructuring that aims to make Aegon a “leading US life insurance and retirement group”, with completion targeted by January 1, 2028. ^[26]

Why the stock is dropping

Reuters notes that Aegon’s Amsterdam‑listed shares fell more than 8% today as investors digested new financial targets and the relocation plan, dragging the broader European insurance sector lower. ^[27]
Investing.com adds that the stock’s decline reflects concerns about execution risk, regulatory complexity and upfront costs associated with the move, even as management pitches the strategy as unlocking long‑term value. ^[28]

Updated targets and outlook

At today’s event, Aegon guided for:

Operating result growth of about 5% per year from 2025–2027, off a run‑rate of €1.5–1.7 billion. ^[29]
A sharper focus on capital generation and its core US retirement franchise, with non‑core assets under strategic review. ^[30]

Bottom line: Strategically, Aegon is leaning into the US market — but for now, shareholders are voting with their feet, sending the stock lower as they reassess risk vs. reward for an ambitious, multi‑year transformation.

Other Notable Decliners and the Themes Behind Them

Beyond the top three, today’s losers list reveals several recurring themes: structural corporate actions, speculative tech, and commodity‑linked volatility.

1. Structural & listing changes: Mobilicom (MOB)

Mobilicom Ltd. ADR (MOB) is down about 8.3% to roughly $7.31. ^[31]

The company recently announced it will terminate its ADR program, list ordinary shares directly on Nasdaq, and execute a 1‑for‑275 reverse split, with the changes centered around its December 8 listing of ordinary shares. ^[32]
Such moves often spur short‑term volatility, as arbitrageurs, index funds and retail traders adjust to new share counts, tickers and free‑float dynamics.

2. Overvalued growth worries: Anbio Biotechnology (NNNN)

Anbio Biotechnology (NNNN) is off about 8.2% near $31 today, continuing a brutal 2025. ^[33]

Seeking Alpha flagged Anbio months ago for “risky valuation” and slowing growth as COVID‑related testing revenue fades. ^[34]
An InvestingPro analysis two weeks ago emphasized that the stock had already fallen over 56% in the four months following an “overvalued” warning, with October alone seeing nearly a 55% plunge. ^[35]
Technical services like StockInvest show a 15% one‑day drop on December 9 and warn that elevated volume on down days has increased near‑term risk. ^[36]

Today’s weakness looks like more of the same: a high‑multiple biotech seeing investors abandon the story as growth normalizes and valuation compresses.

3. Resources & metals volatility: Perpetua (PPTA), Uranium Energy (UEC), TMC, UUUU

Perpetua Resources (PPTA), Uranium Energy (UEC), TMC the metals company (TMC) and Energy Fuels (UUUU) are all down 5–8%. ^[37]

Perpetua (PPTA): Down about 8%, despite a Seeking Alpha upgrade to “Buy” earlier this year on project progress in Idaho and favorable gold and antimony markets. ^[38] The stock has been volatile after a major ~$330 million equity raise and ongoing legal and permitting issues highlighted across recent coverage. ^[39] MarketBeat today notes active institutional trading, with Soviero Asset Management recently increasing its stake at price levels similar to current trading. ^[40]
Uranium Energy (UEC): Down about 7.2% on the day to around $13, even as the company reported Q1 FY2026 results and production of roughly 68,600 lbs of U3O8 with an all‑in cost in the mid‑$30s per pound. ^[41] Ahead of earnings, UEC was “eyeing a $14 breakout,” according to AskTraders, making today’s move look like a classic earnings‑day shakeout after a strong run. ^[42]
TMC & UUUU: Both are leveraged to long‑term expectations around metals demand and uranium prices; their single‑digit drops today fit a pattern of high‑beta resource stocks reacting sharply to even small shifts in sentiment and positioning.

4. Speculative and quantum tech: QUBT, RGTI, CRDO

Quantum and high‑growth tech names are also under pressure:

Quantum Computing Inc. (QUBT) is off nearly 7% after a strong multi‑day rally. Historical data shows the stock surged more than 20% over the last week before today’s pullback. ^[43] A press release this morning touted Quantum’s plans to showcase its technology live at CES 2026, underscoring the stock’s hype‑sensitive nature. ^[44]
Rigetti Computing (RGTI), down about 6% today, has already had a rough month: a recent Fool article notes the stock plunged 42% in November after reporting an 18% revenue decline and steep losses, while other coverage suggests at least one Wall Street analyst thinks the shares could fall another 20%. ^[45]
Credo Technology Group (CRDO), a high‑growth connectivity chip name, is off more than 6%, likely reflecting profit‑taking in richly valued semiconductor and AI‑exposed hardware after a strong year, rather than any single headline.

5. Mobility & consumer names: Lyft (LYFT), Instacart (CART), Bloom Energy (BE), United Natural Foods (UNFI)

Lyft (LYFT): Shares are down about 6% intraday. Recent filings show director Prashant Aggarwal sold nearly $3.9 million worth of stock in early December, following a strong six‑month run in the shares. ^[46] Coverage over the past week has also highlighted ongoing risks around competition, pricing and regulatory scrutiny for ride‑share platforms. ^[47]
Maplebear / Instacart (CART): Instacart is down about 5–6% today after a new report alleged price discrimination, according to a Wall Street Journal piece that hit this afternoon, which sent the shares lower on reputational and regulatory concerns. ^[48]
Bloom Energy (BE): The fuel‑cell and clean‑power company is off more than 6% today, extending weakness after a November in which the stock fell 17.3% amid concerns about valuation and the durability of AI‑driven power demand. ^[49]
United Natural Foods (UNFI): The natural‑foods distributor is down about 5.4%. A TipRanks note last week tied its earlier decline to revenue slightly missing expectations, even though Q1 FY2026 adjusted EPS beat consensus and the company kept its guidance. ^[50] Today, MarketBeat reports that hedge fund Quantedge Capital reduced its position by over 23%, adding to selling pressure. ^[51]

What Today’s Losers Are Telling Us About Market Sentiment

Looking across these moves, several broader themes emerge:

Macro tension + Fed uncertainty: With markets already near record highs and a Fed decision imminent, traders are unwilling to give the benefit of the doubt to companies that disappoint on earnings, guidance or strategy. Even a hint of weaker growth (AeroVironment, UEC) or higher costs (Aegon’s restructuring, Instacart’s reputational risk) can trigger outsized reactions.
Valuation matters again: Many of today’s decliners — Polestar, Anbio, Rigetti, Bloom Energy — have rich multiples or aggressive forward stories. Recent analyses explicitly call out overvaluation (for example, DCF work on AeroVironment and valuation warnings on Anbio). ^[52]
Structural shifts create uncertainty: Big changes like reverse splits, listing transitions and head‑office relocations (Polestar, Mobilicom, Aegon) tend to spook a portion of the shareholder base, at least initially, even when management frames them as long‑term value unlockers.
High‑beta names are the first to be sold: Quantum computing, speculative biotech, small‑cap resources and EVs are all high‑volatility pockets of the market — so in a cautious macro tape, they get hit hardest.

How Traders Typically Use “Top Losers” Lists

For day‑traders, swing‑traders, and longer‑term investors alike, biggest losers lists like today’s serve a few recurring purposes: ^[53]

Idea generation: Deep one‑day drops can flag potential overreactions where fundamentals haven’t changed much but sentiment has — or conversely, where a stock is finally repricing to reality.
Risk management: Monitoring whether losers cluster in certain sectors or factors (e.g., high‑valuation growth, EVs, resource plays) helps traders understand where market risk is building.
Event tracking: Many steep drops are tied to earnings reports, regulatory news, capital raises, or strategic shifts; scanning losers helps people spot these catalysts quickly.
Short‑term trading setups: Some traders look for “dead‑cat bounces” after extreme declines, while others wait for confirmation of breakdowns to position for continued weakness.

For long‑term investors, the key is usually not to blindly buy everything that’s red, but to ask:

Did today’s news genuinely impair the long‑term thesis?
Is valuation now compelling relative to the new information?
Is the company’s balance sheet strong enough to survive a rough patch?

Final Thoughts (and a Quick Reminder)

Today’s top US stock losers — led by Polestar, AeroVironment, and Aegon — show how quickly sentiment can shift when:

Expectations are high
Valuations are stretched
And the macro backdrop (the Fed, rates, and growth fears) is fragile.

For now, these moves look more stock‑specific than systemic: major indices remain near highs, and most S&P 500 names are only modestly lower. But days like this are a reminder that beneath the surface, single‑name risk is alive and well.

Important: This article is for information and news purposes only. It is not financial advice, investment recommendation, or a solicitation to buy or sell any security. Always do your own research or consult a licensed financial professional before making investment decisions.