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Digital cryptocurrencies, Bitcoin, Ripple, Ethernum, Dash, Monero and Litecoin.
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A person claiming to be the hacker behind one of the biggest cryptocurrency heists of all time says they stole the funds “for fun.”

More than $600 million worth of crypto was stolen in the cyberattack, which targeted a decentralized finance platform called Poly Network.

Decentralized finance — DeFi, for short — is a fast-growing space within the crypto industry that aims to reproduce traditional financial products like loans and trading without the involvement of any middlemen.

While it has attracted billions of dollars in investment, the DeFi space has also given rise to new hacks and scams. For example, a token backed by billionaire investor Mark Cuban recently dropped from $60 to several thousandths of a cent in an apparent “bank run.”

Poly Network is a platform that looks to connect different blockchains so they can work together. A blockchain is a digital ledger of transactions that’s maintained by a distributed network of computers, rather than a central authority.

On Tuesday, a hacker exploited a flaw in Poly Network’s code which allowed them to steal the funds. According to researchers at blockchain security firm SlowMist, Poly Network lost more than $610 million in the attack.

Poly Network then pleaded with the hacker to return the money and, sure enough, nearly half of the crypto haul was returned by Wednesday.

In a Q&A embedded within a digital currency transaction Wednesday, a person claiming to be the anonymous hacker explained their reasoning behind the hack — “for fun.”

“When spotting the bug, I had a mixed feeling,” the person said. “Ask yourself what to do had you facing so much fortune. Asking the project team politely so that they can fix it? Anyone could be the traitor given one billion!”

“I can trust nobody!” they continued. “The only solution I can come up with is saving it in a _trusted_ account while keeping myself _anonymous_ and _safe_.”

The person also gave a reason for why they returned the funds, claiming: “That’s always the plan! I am _not_ very interested in money! I know it hurts when people are attacked, but shouldn’t they learn something from those hacks?”

Tom Robinson, chief scientist at blockchain analytics firm Elliptic, said the person writing the Q&A was “definitely” the hacker behind the Poly Network attack.

“The messages are embedded in transactions sent from the hacker’s account,” Robinson told CNBC. “Only the holder of the stolen assets could have sent them.”

CNBC could not independently verify the authenticity of the message and the hacker, or hackers, have not been identified. SlowMist said its researchers had tracked down information on the attacker’s IP and email information. In the Q&A, the hacker claimed they took care to ensure their identity was “untracable.”

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CNBC Daily Open: Investors sell off tech despite steady Broadcom numbers

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CNBC Daily Open: Investors sell off tech despite steady Broadcom numbers

Signage at the Broadcom Inc. headquarters in San Jose, California, U.S., on Monday, June 2, 2025.

David Paul Morris | Bloomberg | Getty Images

The sell-off in artificial intelligence stocks continued unabated Friday stateside. Broadcom shares tumbled more than 11% as investors grew concerned over lower margins and uncertain deals. Names such as Nvidia, Advanced Micro Devices and Oracle fell in sympathy, which caused major U.S. indexes to close lower.

It was a motif patterning the week. Even though the Dow Jones Industrial Average rose 1.1% week on week on the back of outperformance by financial stocks, tech names dragged down the S&P 500 and the Nasdaq Composite, which fell 0.6% and 1.6% respectively for the week.

That said, investors could have just been jittery amid the narrative of an apparent AI bubble, and were spooked by any sign of bad news. After all, Broadcom’s earnings — as well as its guidance for the current quarter — breezed past expectations.

“Frankly we aren’t sure what else one could desire as the company’s AI story continues to not only overdeliver but is doing it at an accelerating rate,” Bernstein analyst Stacy Rasgon, who has a “buy” rating on Broadcom, wrote in a Friday note.

Future prospects also look rosy, according to UBS. “We expect high profitability and the accelerating impact of the AI, power and resources, and longevity themes to drive 2026 performance,” said strategist Sagar Khandelwal.

But in the near term, investors may still be flighty, unless something concretely reassuring, such as Oracle achieving positive cash flow, reassures them the snapping sound is just a twig in the forest.

What you need to know today

U.S. stocks dragged down by AI names. Major indexes fell Friday, a day after they hit record highs. The pan-European Stoxx 600 retreated almost 0.5%. Separately, the U.K. economy unexpectedly shrank 0.1% in the three months to October.

Oracle will finish data centers on time. The company issued its response to a Bloomberg report, which cited unnamed people, that Oracle will complete data centers for OpenAI in 2028 rather than 2027. “There have been no delays,” Oracle said.

Coinbase to have an in-house prediction market. It will be powered be Kalshi, a source close to the matter told CNBC, and is a play to expand asset classes available on the cryptocurrency exchange.

The end of the ‘Berkshire way’? Several aspects of Berkshire Hathaway’s leadership transition are signaling that the conglomerate is drifting away from the famously decentralized “Berkshire way,” CNBC’s Alex Crippen writes.

[PRO] China’s food security strategy. The spate between Beijing and Washington over soybean purchases has highlighted the evolution of China’s domestic agriculture industry. Goldman Sachs thinks this is the best way to play the sector.

And finally…

A bear statue stands outside the Frankfurt Stock Exchange, operated by Deutsche Boerse AG, in Frankfurt, Germany, on Friday, March 13, 2020. Top European CEOs are fearing a euro zone recession as a confluence of economic shocks continues to threaten the outlook for the bloc.

Alex Kraus | Bloomberg | Getty Images

Global week ahead: Europe under fire

U.S. President Donald Trump’s verdict on Europe: a “decaying” group of nations led by “weak” people. His criticism in a recent Politico interview adds to a tough period for the bloc, with challenges on multiple fronts testing European leaders in the final weeks of the year.

This week looks set to be critical, with a high-stakes summit in Brussels and the European Central Bank’s final policy meeting of the year. Key topics for this week include defrosting frozen Russian assets for Ukraine aid; EU vs. U.S. in trade and tech, and updated economic figures at the ECB meeting.

Leonie Kidd

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Broadcom and Costco’s rich valuations leave little room for error as battleground stocks

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Broadcom and Costco's rich valuations leave little room for error as battleground stocks

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ServiceNow in talks to acquire cybersecurity startup Armis in potential $7 billion deal, Bloomberg reports

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ServiceNow in talks to acquire cybersecurity startup Armis in potential  billion deal, Bloomberg reports

Software company ServiceNow is in advanced talks to buy cybersecurity startup Armis, which was last valued at $6.1 billion, Bloomberg reported

The deal, which could reach $7 billion in value, would be ServiceNow’s largest acquisition, the outlet said, citing people familiar with the situation who asked not to be identified because the talks are private. 

The acquisition could be announced as soon as this week, but could still fall apart, according to the report. 

Armis and ServiceNow did not immediately return a CNBC request for comment.

Armis, which helps companies secure and manage internet-connected devices and protect them against cyber threats, raised $435 million in a funding round just over a month ago and told CNBC about its eventual plans for an IPO.

Armis CEO Yevgeny Dibrov and CTO Nadir Izrael.

Courtesy: Armis

CEO and co-founder Yevgeny Dibrov said Armis was aiming for a public listing at the end of 2026 or early 2027, pending “market conditions.” 

Armis’s decision to be acquired rather than wait for a public listing is a common path for startups at the moment. The IPO markets remain choppy and many startups are choosing to remain private for longer instead of risking a muted debut on the public markets. 

Founded in 2016, Armis said in August it had surpassed $300 million in annual recurring revenues, a milestone it achieved less than a year after reaching $200 million in ARR.

Its latest funding round was led by Goldman Sachs Alternatives’ growth equity fund, with participation from CapitalG, a venture arm of Alphabet. Previous backers have included Sequoia Capital and Bain Capital Ventures.

Read the complete Bloomberg article here.

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