Memory and photonics stocks tumbled 5-10% as the 30-year yield hit 2007 highs near 5.3%. Micron fell, Sandisk dropped 7%.
Wall Street closed lower Tuesday in a session that felt distinctly risk-off for growth and technology names. The Nasdaq Composite led the decline, falling roughly 1.3% to around 26,294, while the S&P 500 dropped about 0.6-0.7% to the low 7,690s and the Dow eased a more modest 0.2% to the mid-53,300s. The S&P 500 information technology sector was the clear laggard, and the PHLX Semiconductor Index (SOX) plunged more than 5% – one of its sharper one-day drops in recent months.
What stood out was the breadth of the selling in the AI hardware stack. After several strong sessions driven by memory and optical/photonics names, the tape flipped hard.
Memory and storage stocks, which had been among the market's strongest performers heading into the week, reversed course aggressively. Micron Technology (MU) fell in the 5-7% range after a multi-day winning streak that had pushed it to fresh highs. Sandisk (SNDK) dropped roughly 7-8%, with Western Digital and other storage names also under pressure. The Roundhill Memory ETF reflected the pain, sliding several percentage points.
The move looked like classic profit-taking after a sharp run, layered on top of higher discount rates. When long-term yields climb, the present value of future cash flows for cyclical growth names gets hit first.
The photonics and optical communications group – key enablers of high-speed AI interconnects and co-packaged optics – faced equally heavy selling. LITE, COHR, and AAOI each dropped around 9-10% or more at points during the session. Ciena, Corning, and related names joined the decline. These stocks had been momentum darlings on the back of AI data-center bandwidth demand; today's session was a clear de-risking of that crowded trade.
Three forces drove the rotation. First, bond yields: the 30-year Treasury yield touched its highest level since 2007 at near 5.3%, while the 10-year hovered near multi-year peaks. Higher rates raise the cost of capital and compress valuations for long-duration growth stocks. Second, geopolitics and oil: fading hopes for a near-term resolution on the U.S.-Iran front, including control of the Strait of Hormuz, kept crude elevated with Brent above $90. That feeds inflation concerns and supports the higher-yield narrative. Third, positioning and profit-taking: memory and photonics had run hard into the session. Some analysts also pointed to reports around Anthropic's revenue run-rate that, while still impressive, came in below the most optimistic whispers – enough to take some air out of the pure AI-infrastructure trade.
Mega-cap tech was not immune: Nvidia (NVDA) slipped more than 2%, Meta lost ground again, and names like AMD and Intel saw steeper declines. Defensive areas such as healthcare and energy provided relative shelter.
Today's session was a reminder that even the strongest AI-related themes remain sensitive to rates and risk appetite. The underlying demand story for high-bandwidth memory, advanced packaging, and optical interconnects has not changed overnight – supply remains tight, and hyperscaler capex remains robust. After the recent melt-up in memory and photonics, the market is forcing a valuation and duration check.
The 10-year and 30-year yields bear watching, along with any developments on the Middle East front. Retail earnings including Home Depot and remaining economic data this week will also matter for the broader tone. Positioning is lighter heading into the close, which can create opportunities if yield pressure and geopolitical overhang ease.
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