Wall Street's artificial intelligence (AI) infrastructure complex just endured its ugliest 48 hours of trading this year, and the trigger was not a missed earnings number but a strategic pivot from one of the sector's biggest customers.
An index of semiconductors closed Wednesday 6.3% lower, with technology the weakest of the S&P 500 sectors, before the VanEck Semiconductor ETF surrendered another 4.5% on Thursday.
Bloomberg's report that Meta is building a cloud business, internally dubbed Meta Compute, to sell surplus processing power to outside customers set the whole thing in motion.
On the surface this reads as a diversification story, and the social media giant surged 8.8% to $612.91 to reflect it.
Underneath sits something more corrosive - an admission from a company guiding US$115 billion to $135 billion in capital expenditure this year that it holds more capacity than it needs.
The move was foreshadowed at May's shareholder meeting, where cloud computing was described by chief executive Mark Zuckerberg as "definitely on the table".
Scarcity premise meets supply warning
The entire AI hardware run rested on a single assumption, namely that demand for chips, memory and GPU capacity would perpetually outstrip what suppliers could deliver.
Memory names, the market's favourite bottleneck play, absorbed the worst of the reappraisal.
Micron plunged 10.6% on Wednesday and gave up another 5.5% Thursday, tracking a weekly decline beyond 12%.
SanDisk sank more than 11% in Thursday's session, extending its slide past 20% across both days, while Corning shed over 13% and Applied Materials, Lam Research and Intel each retreated more than 9%.
Even desks friendly to the Facebook parent found reasons for discomfort.
"We'd much prefer that Meta develop core AI products," JPMorgan analyst Doug Anmuth said in a note to clients, arguing the firm should absorb its own infrastructure through inference at scale rather than lease it out.
Neoclouds selling to a rival
The purest casualties were the GPU landlords, who woke up to discover their largest customer intends to become a competitor.
CoreWeave tumbled 13.9% to $85.69, erasing roughly US$7.3 billion in market value - an uncomfortable outcome given Meta-related contracts totalling about $35 billion, or almost 78% of the company's market capitalisation.
Nebius slid 17% to $229.18, while data centre plays IREN and Cipher Digital were similarly punished.
An external Meta cloud operation taking on Amazon, Microsoft and Google would be "problematic for CoreWeave," Bernstein analyst Madison Rezaei said, holding an underperform rating and a $67 target.
Evercore ISI countered that Meta's portion of the neocloud's US$100 billion backlog is committed, take-or-pay and not cancellable - a genuine split worth watching.
The relationship is structural rather than transitional, according to the man running the business.
"There's just too much risk not to," CoreWeave chief executive Michael Intrator told CNBC in April, when asked why Meta would keep renting capacity while building its own data centres.
Stocks that flew too close to the sun
The violence of the reversal only makes sense against the ascent that preceded it.
SanDisk had climbed more than 850% in the first half alone, while Micron's pullback barely dents a year-to-date gain near 300%.
Silicon's second-quarter surge added a combined US$2 trillion in value to Micron, Intel and AMD, and the Roundhill Memory ETF, which nearly tripled from its April launch, was pacing towards a weekly loss of almost 15%.
For some strategists the relative positioning had stretched well before this week's announcement.
The outperformance of chip and memory makers versus hyperscalers since last September "appears somewhat unsustainable in the long run," JPMorgan analyst Nikolaos Panigirtzoglou said.
Rotation, not capitulation
This was a violent rotation rather than a market-wide panic, which is the detail the doom merchants will skip.
The Dow jumped 594.83 points Thursday to a record close of 52,900.07, helped along by a soft June payrolls print of 57,000 jobs against 113,000 expected.
Apple, Microsoft, Amazon, Alphabet and Tesla all finished Wednesday higher as money migrated towards AI spending-cycle winners and away from pure hardware plays.
"This is extremely healthy," KKM Financial founder and chief executive Jeff Kilburg said, describing continued flows from tech profit-taking into the Dow's less glamorous industrials.
The pain still travelled globally, with Samsung and SK Hynix losing more than 7% and 9% respectively and the KOSPI triggering another trading halt.
