S&P 500 tumbles 3% as AI chip stocks drag Wall Street toward its worst day since Trump's tariff announcements in 2025
Published . Updated .
Covered by 2 outlets: LancasterOnline, KTVN.
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This report is about semiconductors and AI and big tech.
Directly affected
- No company is named in this report.
Indirectly affected
- SMH VanEck Semiconductor ETF-16.4% 30d
VanEck Semiconductor ETF: it holds chipmakers. Linked by “chip” (semiconductors) in this story.
- SOXX iShares Semiconductor ETF-20.8% 30d
iShares Semiconductor ETF: it holds chipmakers. Linked by “chip” (semiconductors) in this story.
- QQQ Invesco QQQ-9.8% 30d
Invesco QQQ: it holds the big tech and AI names. Linked by “ai” (AI and big tech) in this story.
- XLI Industrial Select Sector SPDR-0.3% 30d
Industrial Select Sector SPDR: it holds companies hit by import costs and trade rules. Linked by “tariff” (tariffs and trade) in this story.
- ASML ASML Holding N.V-2.4% 15d
ASML Holding N.V (special industry machinery): chip demand, export rules and supply drive chipmakers' shares. Linked by “chip” (semiconductors) in this story.
- NVDA Nvidia-8.4% 30d
Nvidia (semiconductors and related devices): chip demand, export rules and supply drive chipmakers' shares. Linked by “chip” (semiconductors) in this story.
- TSM Taiwan Semiconductor Manufacturing-9.5% 30d
Taiwan Semiconductor Manufacturing (semiconductors and related devices): chip demand, export rules and supply drive chipmakers' shares. Linked by “chip” (semiconductors) in this story.
- MSFT Microsoft+11.8% 30d
Microsoft (prepackaged software): big tech's AI spending and demand drive its shares. Linked by “ai” (AI and big tech) in this story.
Price reaction, T-5 to T+3
| Ticker | T-5 | T-3 | T-1 | T0 | T+1 | T+2 | T+3 |
|---|---|---|---|---|---|---|---|
| SMH | +11.33% | +0.71% | base | -10.38% | after close | after close | after close |
| SOXX | +13.89% | +0.56% | base | -11.44% | after close | after close | after close |
| QQQ | +3.43% | -1.51% | base | -4.35% | after close | after close | after close |
| XLI | +0.40% | +0.18% | base | -1.61% | after close | after close | after close |
| ASML | +12.01% | +1.96% | base | -7.19% | after close | after close | after close |
| NVDA | +6.76% | +1.02% | base | -8.56% | after close | after close | after close |
| TSM | +9.12% | +0.78% | base | -10.32% | after close | after close | after close |
| MSFT | -4.62% | -8.82% | base | -3.47% | after close | after close | after close |
Closing-price change versus T-1, the last close before the story. T0 to T+3 fill in after each market close. Prices: Alpaca IEX.
S&P 500 tumbles 3% as AI chip stocks drag Wall Street toward its worst day since Trump's tariff announcements in 2025 LancasterOnline
Source: LancasterOnline
This story
| Company | When | Move | Status |
|---|---|---|---|
| ASML | that day | -7.19% | still updating |
| ASML | three days earlier | +1.96% | final price |
| ASML | five days earlier | +12.01% | final price |
| MSFT | that day | -3.47% | still updating |
| MSFT | three days earlier | -8.82% | final price |
| MSFT | five days earlier | -4.62% | final price |
| NVDA | that day | -8.56% | still updating |
| NVDA | three days earlier | +1.02% | final price |
| NVDA | five days earlier | +6.76% | final price |
| QQQ | that day | -4.35% | still updating |
| QQQ | three days earlier | -1.51% | final price |
| QQQ | five days earlier | +3.43% | final price |
| SMH | that day | -10.38% | still updating |
| SMH | three days earlier | +0.71% | final price |
| SMH | five days earlier | +11.33% | final price |
| SOXX | that day | -11.44% | still updating |
| SOXX | three days earlier | +0.56% | final price |
| SOXX | five days earlier | +13.89% | final price |
| TSM | that day | -10.32% | still updating |
| TSM | three days earlier | +0.78% | final price |
| TSM | five days earlier | +9.12% | final price |
| XLI | that day | -1.61% | still updating |
| XLI | three days earlier | +0.18% | final price |
| XLI | five days earlier | +0.40% | final price |
Congressional trades in the stocks in this story
- Rep. Kevin Hern sold Asml Holding (ASML) (jointly held), worth $15,001 - $50,000 on 23 Oct 2026. That is 13 days before publication. Filed 28 Oct 2026. View the filing.
- Rep. Michael T. McCaul bought Asml Holding (ASML) (held by a spouse), worth $50,001 - $100,000 on 7 Aug 2026. That is 90 days before publication. Filed 14 Oct 2026. View the filing.
- Rep. Pete Sessions sold Nvidia (NVDA) (held by a spouse), worth $15,001 - $50,000 on 2 Oct 2026. That is 34 days before publication. Filed 27 Oct 2026. View the filing.
- Rep. Cleo Fields bought Nvidia (NVDA), worth $1,001 - $15,000 on 1 Oct 2026. That is 35 days before publication. Filed 22 Oct 2026. View the filing.
- Rep. Rohit Khanna bought Nvidia (NVDA) (held by a dependent child), worth $1,001 - $15,000 on 23 Sep 2026. That is 43 days before publication. Filed 7 Oct 2026. View the filing.
- Rep. Cleo Fields bought Taiwan Semiconductor Manufacturing (TSM), worth $1,001 - $15,000 on 9 Oct 2026. That is 27 days before publication. Filed 22 Oct 2026. View the filing.
- Rep. Gilbert Cisneros bought Taiwan Semiconductor Manufacturing (TSM), worth $1,001 - $15,000 on 22 Sep 2026. That is 44 days before publication. Filed 12 Oct 2026. View the filing.
- Rep. Michael T. McCaul sold Taiwan Semiconductor Manufacturing (TSM) (held by a spouse), worth $1,001 - $15,000 on 25 Aug 2026. That is 72 days before publication. Filed 14 Oct 2026. View the filing.
- Rep. Pete Sessions sold Microsoft (MSFT) (held by a spouse), worth $250,001 - $500,000 on 2 Oct 2026. That is 34 days before publication. Filed 27 Oct 2026. View the filing.
- Rep. Lisa McClain bought Microsoft (MSFT) (held by a spouse), worth $1,001 - $15,000 on 30 Sep 2026. That is 36 days before publication. Filed 12 Oct 2026. View the filing.
- Rep. Michael Rulli sold Microsoft (MSFT), worth $1,001 - $15,000 on 28 Sep 2026. That is 38 days before publication. Filed 2 Oct 2026. View the filing.
Public disclosure filings, not a recommendation. The filing link is the source document. News use of these reports still sits under 5 U.S.C. § 13107(c).
This story
25 out of 100Price not final
“S&P 500 tumbles 3% as AI chip stocks drag Wall Street toward its worst day since Trump's tariff announcements in 2025” scores 25 out of 100. The score uses 2 sources. The price is not final yet.