WDC fell -4.62% to $426.50 during regular trading, extending a multiday storage-sector selloff. Primary catalyst: a discounted ~$3.09B secondary offering of its SanDisk (SNDK) stake, priced roughly -7.7% below SanDisk's prior close, raising concerns over asset valuation.

INTC is down -5.21% to about $97.58 in regular trading Monday, extending premarket losses after Friday's close of $102.94. The decline is driven by sector-wide AI deceleration fears after Anthropic CEO Dario Amodei, backed by Sam Altman and Elon Musk, urged slowing frontier AI development.

LRCX fell -7.08% during the regular session, trading near $277 versus a $298.22 prior close. The primary catalyst was a sector-wide chip-equipment selloff after AI leaders (Anthropic, OpenAI, xAI) called for slowing the pace of AI model development, stoking fears that hyperscaler capex and future fab-tool orders could decelerate.

Both LRCX and TER operate in the semiconductor equipment sector and have benefited from AI-driven demand in recent market activity. LRCX recently raised its 2026 wafer fabrication equipment (WFE) spending outlook and announced a 27% dividend increase while committing over $3 billion to R&D expansion.

ALAB fell -10.20% intraday to about $261.52 during regular trading, down from Friday's $291.22 close. Primary catalyst: a broad AI/semiconductor selloff as rising interest rates pressured high-multiple growth stocks, with the Nasdaq off roughly -1.2%.

SHAZ fell -10.81% to $52.99 during Monday's regular session, down from Friday's $59.41 close. Primary catalyst: reports that Meta Platforms is building a cloud business to sell its excess AI compute, threatening demand for neocloud providers like SharonAI.

MTSI fell -11.17% during regular trading hours, sliding from a prior close of $274.90 to about $244.18 intraday. The primary catalyst was MACOM's removal from Russell value benchmarks (Russell 1000 Value and Russell Midcap Value), triggering forced institutional/index-fund selling despite unchanged fundamentals.

NVT fell -11.04% to $144.45 during regular trading, down from Friday's close of $162.38. The drop was not driven by company-specific news, but by a macro-led rotation out of high-multiple AI-infrastructure and electrical-equipment names.

COHR fell -11.21% to roughly $271.13 from its prior close of $305.37, with the decline occurring during regular trading hours. Primary catalyst: leading AI executives publicly called for slowing frontier AI model development, triggering a sharp selloff across AI optical-networking names.

NOK is down roughly -11%, sliding to about $9.89 from Friday's close of $11.13. The decline began in premarket (shares fell about -9.8% to $10.03) and extended during the regular session.

TER fell -11.44% during regular trading, sliding from a $379.72 prior close to roughly $336.28. The drop was driven by a broad AI/semiconductor selloff, not company-specific news, as investors rotated out of high-multiple chip and AI-hardware names.

CSHR fell -10.63% during regular trading on Sept. 14, sliding from a prior close of $5.36 to roughly $4.79. The move followed the release of H1 2026 results, with revenue down -35.7% year-over-year to $51.4 million.

Swarmer (SWMR) fell -14.09% intraday Monday to about $34.01, reversing Friday's +10% gain to $39.59. The decline occurred during the regular session, with heavy volume as traders took profits following last week's acquisition-driven spike.

HQ is trading down roughly -27.2% during regular market hours, falling from Friday's $15.22 close to about $11.08 on elevated volume. The decline is occurring in Monday's regular session, not premarket or after-hours, with the intraday low near $14.74 giving way to a sharp leg lower.

HPE fell -10.31% to $55.69 during Monday's regular session, down from Friday's $62.09 close. The primary catalyst was an Evercore ISI downgrade to In Line from Outperform, citing stretched valuation at ~13x FY2027 earnings versus a ~8x five-year average after a 158.5% YTD surge.

GLW fell -10.85% to about $148.35 during the regular session, versus a prior close of $166.40. The drop began premarket, gapping down roughly -7% to -8%, then extended after the open.

McDonald's (MCD) shares traded near $252.53, down roughly 8.4% over the trailing 30 days and close to their 52-week low of $252.15. Second-quarter 2026 adjusted EPS of $3.38 beat consensus estimates of $3.32, but revenue of $7.10 billion slightly missed expectations.

AMD fell -5.98% to $485.27 in Monday trading, extending a slide that began in the premarket as AI-linked chip stocks sold off broadly. The drop is driven by calls from top AI executives — Anthropic's Dario Amodei, OpenAI's Sam Altman, and Elon Musk — to slow the pace of frontier AI model development over safety concerns.

MU is down -6.79% to about $909, sliding from Friday's close of $975.26, with the decline hitting in premarket trading and extending into the regular session. The sell-off was triggered by comments from Anthropic CEO Dario Amodei and OpenAI CEO Sam Altman calling for a slower pace of advanced AI development, with Elon Musk echoing the view, raising fears of softer demand for AI memory.

AEHR fell -12.77% to $82.60 in the regular session's opening trade, down from Friday's $94.69 close. Primary catalyst: a broader AI-chip sell-off sparked by AMD's guidance for a sequential first-quarter sales decline, stoking fears of slowing AI infrastructure spending.