Driven by an insatiable global demand for Artificial Intelligence (AI) infrastructure, memory chip giant Micron Technology surpassed social media powerhouse Meta Platforms in total market valuation for the first time in history on Thursday.
The Catalyst: $22 Billion in Commitments
Micron’s dramatic stock rally was triggered by an exceptionally strong fourth-quarter outlook. The company revealed that tech customers have already locked in a staggering $22 billion in supply commitments for its high-bandwidth memory chips, which are crucial for powering advanced AI servers. This massive forward-looking demand completely reversed a recent minor slump in Micron’s stock.
The Market Cap Flip
| Company | Share Price Change | Current Market Valuation |
| Micron Technology (MU) | +18.5% (to $1,244.40) | $1.393 Trillion |
| Meta Platforms (META) | — | $1.391 Trillion |
Market Context: This shift highlights a broader trend on Wall Street, where the physical infrastructure required to build AI (hardware and memory chips) is temporarily commanding a premium over the software and social platforms utilizing it.
S&P 500 Market Summary (June 25, 2026)
While Micron stole the headlines, here is how the rest of the broader S&P 500 performers shook out at the close:
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Top Gainers:
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Builders FirstSource: $85.41 (+11.31%)
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Mohawk Industries: $119.09 (+9.60%)
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IQVIA Holdings: $185.62 (+8.37%)
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Top Losers:
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Coterra Energy: $32.56 (-8.62%)
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Apollo Asset Management: $122.60 (-6.13%)
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Blackstone: $112.99 (-5.90%)
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