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Chip Stocks Crater June 23: SOX Sinks 7.9%, Memory Names Lead the Rout

The Philadelphia Semiconductor Index plunged 7.9% on Tuesday — NVDA off 4.1%, INTC/AMD/MRVL down 5.8%–9.4%, QCOM shed ~8% on AI deal rumors, and memory stocks MU and SNDK fell as much as 10%–11% intraday as Korea's KOSPI cratered ~10%.

OurAlpha

24 Jun 2026 — 3 min read

From mega-caps to memory names, barely a chip stock escaped Tuesday's selloff.

Semiconductor stocks sold off broadly on Tuesday, June 23, with the Philadelphia Semiconductor Index (SOX) closing down 7.9%. The rout spanned large-cap designers, memory chip makers, and equipment names — memory stocks briefly fell more than 10% intraday.

The Philadelphia Semiconductor Index (SOX) closed down 7.9%.
Nvidia (NVDA) shed ~4.1%; Intel (INTC), AMD, and Marvell (MRVL) fell roughly 5.8%–9.4%.
Qualcomm (QCOM) dropped ~8.01% to $204.13, wiping out ~$19 billion in market cap, as AI acquisition rumors and a next-day investor day drew scrutiny.
Micron (MU), SanDisk (SNDK), and Western Digital (WDC) fell ~10%–11% intraday, with some closing losses even deeper; Korea's KOSPI dropped ~10%.
The Nasdaq Composite closed down 2.21%; the S&P 500 fell 1.44%.

Semiconductor stocks sold off across the board on Tuesday, June 23, with the Philadelphia Semiconductor Index (SOX) closing down 7.9% as large-cap designers, memory makers, and other chip names all logged declines.^[1] The Nasdaq Composite fell 2.21% to 25,587.04 and the S&P 500 slid 1.44% to 7,365.47.^[2] Below is a stock-by-stock breakdown of the day's moves and the reported catalysts behind them; all characterizations and causal attributions are sourced.

Large-Cap Chip Movers

Several major chip designers and manufacturers closed lower on the day:

Nvidia (NVDA): closed down ~4.1%.^[1]
Intel (INTC): fell roughly 5.8%–9.4%.^[1]
AMD: fell roughly 5.8%–9.4%.^[1]
Marvell (MRVL): fell roughly 5.8%–9.4%.^[1]

Reuters reported that the sector pullback came amid market questions about AI-related capital spending, quoting observers who said "some recent news about AI has raised questions about spending, capital expenditures and the expansion of semiconductor capacity."^[2] The same report noted investors were also positioning for a potentially more hawkish Fed, with some traders pricing in the possibility of another rate hike before December.^[2] These are market interpretations cited by the press, not OurAlpha's views.

Qualcomm: Acquisition Rumors and Investor Day

Qualcomm (QCOM) was among the hardest-hit names in the sector. The stock closed down ~8.01% to $204.13, erasing roughly $19 billion in market cap.^[3]

According to reports, the decline was tied to Qualcomm's rumored AI-related acquisitions and its investor day scheduled for the following morning. Bloomberg reported that Qualcomm is in late-stage talks to acquire AI software company Modular at a price roughly 150% above its ~$1.6 billion valuation from nine months prior; Qualcomm was also reported to have approached chip startup Tenstorrent in a potential deal worth $8–10 billion.^[3] The two potential transactions would total roughly $12–14 billion combined, raising investor questions about the impact on cash returns. Neither deal has been officially confirmed by either party and both remain subject to uncertainty; this article presents them as reported.^[3]

Qualcomm's investor day is scheduled for Wednesday, June 24, in New York, where management plans to outline its data center strategy at 2:15 p.m. ET.^[3] Several outlets flagged the event as a near-term market focus.

Memory Stocks Lead the Decline

Memory-related names were the session's worst performers, falling ~10%–11% at their intraday lows, with some closing at even steeper losses:

SanDisk (SNDK): fell as much as ~11% intraday to $2,027.50.^[4]
Micron (MU): fell as much as ~10% intraday to $1,085.^[4]
Western Digital (WDC): fell as much as ~10% intraday to $658.^[4]
Roundhill Memory ETF (DRAM): fell as much as ~14% in premarket trading.^[4]

Reports attributed the memory selloff in part to overnight risk-off sentiment in Asia. Korea's KOSPI closed down ~10%, with trading briefly halted for ~20 minutes; SK Hynix fell more than 12%.^[4] The same report highlighted the scale of prior gains as context — SNDK had risen as much as ~858% YTD, while MU and WDC had each gained more than 325% YTD before Tuesday's pullback.^[4] All figures and characterizations are per media reports.

As noted in press coverage, Micron (MU) is set to report its fiscal Q3 2026 results after the close on Wednesday, June 24, making earnings the next key catalyst for the memory sector.^[4]

Sector Index and Broader Context

The SOX's 7.9% decline significantly outpaced the Nasdaq Composite (-2.21%) and the S&P 500 (-1.44%), indicating that selling pressure was concentrated in semiconductors.^[1][2]

Across multiple media reports, the cited drivers behind Tuesday's selloff included concerns about AI-related capex and capacity expansion, questions about the Fed's rate path, and risk-off contagion from Asian markets — particularly Korea.^[2][4] These factors were cited by different sources; OurAlpha makes no judgment on their relative weight. Looking ahead, Qualcomm's investor day and Micron's earnings report are the near-term events highlighted in media coverage.^[3][4]