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US stocks stumble as AI trade takes a hit

Friday’s drop pushed the S&P 500 marginally into negative territory for the week.

Nia Warfield, Luke Kawa

US stocks slumped into the long weekend, with the S&P 500 ending August with its biggest daily decline since the first trading day of the month.

Even so, the drop of 0.6% barely pulled the benchmark US stock index into the red for the week. The Nasdaq 100 fared worse on Friday, falling 1.2%, while the Russell 2000 gave back 0.5%.

Tech and consumer discretionary were the worst-performing S&P 500 sector ETFs, while the beaten-up defensive pockets of the market like healthcare and consumer staples caught a bid to end the week.

Autodesk was one of the session’s bright spots, up 9.1% after the maker of design software posted a beat-and-raise earnings report after Thursday’s close. Meanwhile, Dell led declines, falling 8.9% after the tech hardware company topped Q2 estimates but issued soft guidance for Q3. Elsewhere...

Marvell Technology fell 18.6% after posting lower-than-expected data center results and a weak Q3 forecast. Meanwhile, hyperscaler Oracle also fell 5.9% amid a broader pullback for the AI trade, fueled in part by Marvell’s weak outlook.

Nvidia shares fell 3.3% following a Wall Street Journal report that Alibaba was developing an AI chip to be manufactured in China.

Super Micro Computer fell 5.5% after the AI server maker warned it still hasn’t fully fixed the accounting issues that nearly got it delisted from the Nasdaq back in February.

Alibaba rose 12.9% after the Chinese e-commerce giant missed Q1 earnings and revenue expectations but beat estimates for its all-important cloud and AI segment.

Petco shares surged 23.5% as traders applauded the pet store chain’s strong second-quarter results and improved full-year EBITDA guidance, which were released after the bell on Thursday.

Affirm shares leapt 10.6% after the buy now, pay later giant posted a Q4 earnings beat and issued a stronger-than-expected forecast for its key gross merchandise volume (GMV) metric.

Celsius shares jumped 5.3%, hitting a 52-week high, after Pepsi hiked its stake in the energy drink maker to 11% in a $585 million deal. Pepsi shares rose 1.1% on the news.

Opendoor shares climbed 4.2% after CEO Shrisha Radhakrishna purchased 30,000 shares of company stock.

Ulta Beauty shares were up as much as 3.7% in early trading before closing down 7.1%, even as the beauty juggernaut posted a strong Q2 and raised its full-year outlook.

Lucid shares slid 4.4%, hitting a record low, after Stifel slashed its price target by 30% to $2.10 from $3. The luxury EV maker is also bracing for a 1-for-10 reverse stock split next week.

Duolingo shares dropped 7.7% as the language-learning company (and retail favorite) slipped into a sudden reversal in the momentum trade that has dominated the market bounce since mid-April.

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Core Scientific craters after soft Q4 sales

Core Scientific is sinking in postmarket trading after reporting much lower-than-expected sales in the final three months of 2025 and informing investors of an accounting error in its previous results.

For Q4, the bitcoin miner turned data center company reported:

  • Revenues of $79.8 million (estimate: $115 million).

  • Adjusted net income of $216 million (estimate: -$47.5 million).

Core Scientific’s self-mining and high-performance computing hosting divisions posted far less in sales than anticipated.

The company also indicated that it had overstated the value of property, plant, and equipment, requiring a number of previous releases to be restated. However, these changes do not affect revenue, adjusted EBITDA, or net cash flows, management said.

Core Scientific shareholders rejected CoreWeave’s offer to purchase the company in Q4, which would have created a more vertically integrated neocloud provider.

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Credo Technology tumbles after issuing mediocre guidance

Credo Technology Group is down double digits in postmarket trading after its solid Q3 results weren’t enough to offset a ho-hum outlook for the current quarter.

For Q3, the connectivity solutions company posted:

  • Revenues of $407 million (estimate: $406.4 million).

  • Adjusted earnings per share of $1.07 (estimate: $0.92).

However, for Q4, management said sales would range between $425 million and $435 million, the midpoint of which is modestly below Wall Street’s call for $430.5 million.

Shares of Credo had spiked earlier this month when management released preliminary Q3 figures and signaled that its rapid sales growth would continue.

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Archer reports deeper-than-expected Q4 loss

Air taxi maker Archer Aviation reported its fourth-quarter earnings results after the bell on Monday. Its shares fell 2.4% after-hours, eating into some of the gains the stock made in the regular session.

The company posted a loss of $0.26 per share, compared to the $0.24 loss per share expected by analysts polled by FactSet.

Archer ended 2025 with $1.96 billion in cash and cash equivalents, up from Q3’s $1.64 billion and up from $834.5 million in the same quarter the year prior.

Looking ahead to the first quarter, Archer said it expects adjusted earnings before interest, taxes, depreciation, and amortization of between -$160 million and -$180 million. Wall Street expected EBITDA of -$104.7 million in Q1.

Last week, Archer announced that it would partner with SpaceX’s Starlink to bring satellite internet into its Midnight aircraft. In its fourth-quarter shareholder letter, the company said it is targeting its first passenger flights this year, mirroring rival Joby’s timeline.

In a sign that investors, like CEO Adam Goldstein, see Archer’s most promising near-term opportunity in its defense business, its shares closed up more than 5% on Monday as investors scooped up defense contractor stocks. Goldstein told Sherwood News last year that he sees defense, with a focus on the autonomous and attritable industry, as the company’s “front and center” division for the next decade. Per the company’s shareholder letter:

“Our partnership with Anduril is at the core of our defense strategy, and it continues to accelerate. We are designing an autonomous, hybrid-electric VTOL aircraft built for dual use. For defense, it will fly alongside armed reconnaissance attack helicopters as a loyal wingman. The aircraft is designed to meet the needs of the U.S. and its allies for decades to come.”

Electric aircraft rivals Beta Technologies and Joby Aviation also ended the day higher.

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Plug Power pops after Q4 revenues exceed expectations

Plug Power is soaring in postmarket trading after issuing solid fourth-quarter sales that more than outweighed some massive red ink on its bottom line.

The hydrogen fuel cell company reported:

  • Revenues of $225.22 million (estimate: $217.26 million).

  • Adjusted earnings per share of -$0.06 (estimate: -$0.10).

$763 million in “various net charges” over the course of the quarter caused many of Plug’s other earnings metrics to look significantly worse.

Management reaffirmed its goal of having positive EBITDAS (the “S” is for stock-based compensation) by 2026, and said the company is “positioned” to do so.

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