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A Duolingo logo is seen on a smartphone.

Pavlo Gonchar | LightRocket | Getty Images

Duolingo shares rose nearly 7% on Thursday following a large spike in users signing up to learn Mandarin in conjunction with soaring usage of Chinese social media app RedNote, a TikTok rival.

The company confirmed to CNBC that there’s been a 216% increase in Mandarin learners using the app compared to a year earlier. For context, Spanish, one of the most popular languages on the app, has seen a 40% increase over the same period, Duolingo said.

RedNote, or Xiaohongshu, as it’s known in China, has rocketed to become the No. 1 free app on the Apple app store, a position it’s held for most of this week. Rounding out the top five are TikTok’s Lemon8 app, U.S. social media upstart Clapper, OpenAI’s ChatGPT and Meta’s Threads.

Last week, the Supreme Court heard oral arguments in the case involving the future of TikTok in the U.S., and a law that could effectively ban the popular app. The justices appeared to favor upholding the law, and a decision could come as soon as Friday. TikTok is reportedly preparing for a U.S. shutdown on Sunday.

RedNote has so far been the top beneficiary of the American user exodus, seeing its U.S. app downloads increase by 20 times over the last week, according to market intelligence firm Sensor Tower. A Duolingo spokesperson told CNBC that the company’s marketing team is “forward-thinking and already has an active presence on Red, managed by our team in China.”

Duolingo offers online and mobile courses across 42 languages. According to its website, Duolingo has 48.8 million Spanish learners. French is the second most popular language on the app at 27.3 million users, while Chinese is eighth at 10.7 million.

Duolingo shares climbed 43% last year, topping the Nasdaq’s 29% gain.

WATCH: AI will continue to be catalyst for Duolingo

AI continues to be catalyst for Duolingo but 'killer' for Shutterstock: Citizens JMP's Andrew Boone

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Trump advisor Navarro rips Apple’s Tim Cook for not moving production out of China fast enough

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Trump advisor Navarro rips Apple's Tim Cook for not moving production out of China fast enough

Peter Navarro: 'Inconceivable' that Apple could not produce iPhones outside China

White House trade advisor Peter Navarro chastised Apple CEO Tim Cook on Monday over the company’s response to pressure from the Trump administration to make more of its products outside of China.

“Going back to the first Trump term, Tim Cook has continually asked for more time in order to move his factories out of China,” Navarro said in an interview on CNBC’s “Squawk on the Street.” “I mean it’s the longest-running soap opera in Silicon Valley.”

CNBC has reached out to Apple for comment on Navarro’s criticism.

President Donald Trump has in recent months ramped up demands for Apple to move production of its iconic iPhone to the U.S. from overseas. Apple’s flagship phone is produced primarily in China, but the company has increasingly boosted production in India, partly to avoid the higher cost of Trump’s tariffs.

Trump in May warned Apple would have to pay a tariff of 25% or more for iPhones made outside the U.S. In separate remarks, Trump said he told Cook, “I don’t want you building in India.”

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Analysts and supply chain experts have argued it would be impossible for Apple to completely move iPhone production to the U.S. By some estimates, a U.S.-made iPhone could cost as much as $3,500.

Navarro said Cook isn’t shifting production out of China quickly enough.

“With all these new advanced manufacturing techniques and the way things are moving with AI and things like that, it’s inconceivable to me that Tim Cook could not produce his iPhones elsewhere around the world and in this country,” Navarro said.

Apple currently makes very few products in the U.S. During Trump’s first term, Apple extended its commitment to assemble the $3,000 Mac Pro in Texas.

In February, Apple said it would spend $500 billion within the U.S., including on assembling some AI servers.

WATCH: Apple’s $500 billion investment: For AI servers not manufacturing iPhones

Apple's $500 billion U.S. investment: For AI servers not manufacturing iPhones

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CoreWeave to acquire Core Scientific in $9 billion all-stock deal

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CoreWeave to acquire Core Scientific in  billion all-stock deal

CoreWeave founders Brian Venturo, at left in sweatshirt, and Mike Intrator slap five after ringing the opening bell at Nasdaq headquarters in New York on March 28, 2025.

Michael M. Santiago | Getty Images News | Getty Images

Artificial intelligence hyperscaler CoreWeave said Monday it will acquire Core Scientific, a leading data center infrastructure provider, in an all-stock deal valued at approximately $9 billion.

Coreweave stock fell about 4% on Monday while Core Scientific stock plummeted about 20%. Shares of both companies rallied at the end of June after the Wall Street Journal reported that talks were underway for an acquisition.

The deal strengthens CoreWeave’s position in the AI arms race by bringing critical infrastructure in-house.

CoreWeave CEO Michael Intrator said the move will eliminate $10 billion in future lease obligations and significantly enhance operating efficiency.

The transaction is expected to close in the fourth quarter of 2025, pending regulatory and shareholder approval.

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The deal expands CoreWeave’s access to power and real estate, giving it ownership of 1.3 gigawatts of gross capacity across Core Scientific’s U.S. data center footprint, with another gigawatt available for future growth.

Core Scientific has increasingly focused on high-performance compute workloads since emerging from bankruptcy and relisting on the Nasdaq in 2024.

Core Scientific shareholders will receive 0.1235 CoreWeave shares for each share they hold — implying a $20.40 per-share valuation and a 66% premium to Core Scientific’s closing stock price before deal talks were reported.

After closing, Core Scientific shareholders will own less than 10% of the combined company.

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Apple appeals 500 million euro EU fine over App Store policies

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Apple appeals 500 million euro EU fine over App Store policies

Two young men stand inside a shopping mall in front of a large illuminated Apple logo seen through a window in Chongqing, China, on June 4, 2025.

Cheng Xin | Getty Images

Apple on Monday appealed what it called an “unprecedented” 500 million euro ($586 million) fine issued by the European Union for violating the bloc’s Digital Markets Act.

“As our appeal will show, the EC [European Commission] is mandating how we run our store and forcing business terms which are confusing for developers and bad for users,” the company said in a statement. “We implemented this to avoid punitive daily fines and will share the facts with the Court.”

Apple recently made changes to its App Store‘s European policies that the company said would be in compliance with the DMA and would avoid the fines.

The Commission, which is the executive body of the EU, announced its fine in April, saying that Apple “breached its anti-steering obligation” under the DMA with restrictions on the App Store.

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“Due to a number of restrictions imposed by Apple, app developers cannot fully benefit from the advantages of alternative distribution channels outside the App Store,” the commission wrote. “Similarly, consumers cannot fully benefit from alternative and cheaper offers as Apple prevents app developers from directly informing consumers of such offers.”

Under the DMA, tech giants like Apple and Google are required to allow businesses to inform end-users of offers outside their platform — including those at different prices or with different conditions.

Companies like Epic Games and Spotify have complained about restrictions within the App Store that make it harder for them to communicate alternative payment methods to iOS users.

Apple typically takes a 15%-30% cut on in-app purchases.

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