Micron, Sandisk and Seagate added about $65 billion in combined market value in the first minutes of US trading on 11 November, by our arithmetic, a day after CoreWeave reported its third-quarter results. At 9:37 a.m. ET, Nasdaq quotes had Sandisk up 7.93%, Seagate up 6.46% and Micron up 5.83%.
CoreWeave itself was up 13.05% at $55.09, a gain of about $3.5 billion on Nasdaq’s market-value figure. The three memory and storage makers added about 18.5 times that, mostly because Micron alone is worth about $868 billion at the same price, by our arithmetic.
Business Pill · The Memory Wall
An evergreen Business Engineer explainer on the memory wall, the limit memory bandwidth puts on AI chips. It teaches the general idea only and does not discuss today’s trading.
The key insight: As we read it, the open shows where the market books a GPU cloud’s good news: CoreWeave rose the most in percentage terms, 13.05%, but Micron, Sandisk and Seagate added about $65 billion against CoreWeave’s $3.5 billion, by our arithmetic.
Close (11 Nov). At the 4 p.m. New York close, on Nasdaq’s closing quotes, Micron ended up 11.9% at $811.30, Sandisk up 13.7% at $977.69 and Seagate up 10.0% at $551.72. On the same SEC share counts, that is about $97.5 billion of added value for Micron, $16.7 billion for Sandisk and $11.5 billion for Seagate, about $125.8 billion together, by our arithmetic. That is below the $147.3 billion at the 12:22 p.m. ET reading, and about 19 times the $6.6 billion CoreWeave added on its 24.7% gain to $60.77, by our arithmetic. Our close wrap has the rest of the AI trade. Sources: Nasdaq closing quote; Yahoo Finance delayed data as a cross-check.
Micron rose $42.31 to $767.42, which on its 1,131,423,212 shares outstanding comes to about $47.9 billion of added value. Sandisk rose $68.24 to $928.23, about $9.7 billion on 142,289,365 shares, and Seagate rose $32.38 to $534.00, about $7.4 billion on 229,561,109 shares. Share counts are from each company’s latest SEC filing.
Western Digital, the other hard-drive maker, was up 4.79%, about $5.2 billion more. The moves were larger a few minutes earlier: at 9:32 a.m. ET, Sandisk was up 9.52%, Seagate 8.09%, Micron 7.03% and CoreWeave 14.06%, per Nasdaq quotes.
Market value added at 9:37 a.m. ET on 11 November 2026, by our arithmetic: each company’s latest SEC share count times its price change on Nasdaq quotes; CoreWeave on Nasdaq’s market-cap figure. Early-session prices.Change against the previous close at 9:32 and 9:37 a.m. ET on 11 November 2026, per Nasdaq quotes. All five gains narrowed over the five minutes. Early-session prices.
Filing check (11 Nov): Fidelity’s parent FMR LLC filed a Schedule 13G, signed 4 November and posted on EDGAR on 5 November, reporting about 11.46 million Seagate shares, 5.1% of the class, as of 30 September. FMR reports sole voting power over about 10.16 million of them; Abigail P. Johnson is named as a second reporting person over the same 11.46 million shares.
Update (11 Nov, 12:22 p.m. ET): the gains roughly doubled by midday. At 12:22 p.m. ET, Nasdaq quotes had Micron up 13.76% at $824.895, Sandisk up 16.28% at $999.98 and Seagate up 12.55% at $564.59. On the same SEC share counts, that is about $112.9 billion of added value for Micron, $19.9 billion for Sandisk and $14.5 billion for Seagate, about $147.3 billion together, 2.27 times the $65 billion at 9:37 a.m. ET, by our arithmetic. Intraday prices, not a close.
Why CoreWeave Moves Memory
CoreWeave filed an 8-K on 10 November saying it had issued a press release on its results for the quarter ended 30 September. We covered the reaction in Europe, where CoreWeave lifted AI stocks 4.7%, and the positioning before it, when short bets on CoreWeave rose 35%.
As we read it, the link to memory is demand: a GPU cloud that buys more servers also buys more high-bandwidth memory and storage, and the market-value gains landed mostly on those suppliers, not on CoreWeave. We tracked the wider chip rebound in AMD’s $182 billion gain.
The Structural Read
As we read the split, size does the work: Micron’s $42.31 rise on more than 1.1 billion shares is about $47.9 billion on its own, roughly three-quarters of the three-company total.
As we read the minute-by-minute quotes, every gain narrowed between 9:32 and 9:37 a.m. ET, so the dollar figures are a snapshot of the open, not a close.
CoreWeave, Form 8-K, 10 November 2026
“issued a press release announcing its financial results for the fiscal quarter ended September 30, 2026”
Three Implications
FOR MEMORY AND STORAGE MAKERS Micron, Sandisk and Seagate were up 5.83% to 7.93% at 9:37 a.m. ET, per Nasdaq quotes.
FOR COREWEAVE Its shares were up 13.05% at $55.09, about $3.5 billion on Nasdaq’s market-value figure, by our arithmetic.
FOR READERS TRACKING THE AI TRADE Western Digital added about $5.2 billion more at the same time, by our arithmetic; these are early-session prices.
The framework argues: “Memory is becoming the new compute.”
As we read it, today’s open fits that frame: a GPU cloud’s results moved the memory makers’ market value far more in dollars than its own. The framework predates today’s trading and does not discuss it.
What Is Not Established
These are early-session prices and can reverse before the close. The value-added figures multiply each company’s latest reported share count by the price change and are our arithmetic, not exchange data; CoreWeave’s uses Nasdaq’s market-cap figure, which may not count every share class.
Nothing in the quotes or filings we read says why the shares moved; linking the moves to CoreWeave’s results is a market reading, not a company statement. We did not contact the companies.
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At 9:37 a.m. ET, Micron, Sandisk and Seagate had added about $65 billion in market value between them, by our arithmetic, about 18.5 times CoreWeave’s own $3.5 billion gain on the day after its results.
A note on sourcing. Prices are Nasdaq quotes at 9:32 and 9:37 a.m. ET on 11 November 2026. Share counts are from each company’s latest SEC filing cover page; CoreWeave’s value uses Nasdaq’s market-cap figure. Value-added figures are our arithmetic. We first saw the move in a 24/7 Wall St. report. We did not contact the companies.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
