In a wild October for markets, these stocks were the biggest winners and losers
Published . Updated .
Many Big Tech stocks were hit hard but the S&P 500 showed strength under the surface, with a majority of stocks showing gains for the month.
Directly affected
- No company is named in this report.
Indirectly affected
- QQQ Invesco QQQ+0.9% 30d
Invesco QQQ: it holds the big tech and AI names. Linked by “big tech” (AI and big tech) in this story.
- AIQ Global X Artificial Intelligence & Technology ETF-1.6% 30d
Global X Artificial Intelligence & Technology ETF: it holds the big tech and AI names. Linked by “big tech” (AI and big tech) in this story.
- MSFT Microsoft+7.6% 30d
Microsoft (prepackaged software): big tech's AI spending and demand drive its shares. Linked by “big tech” (AI and big tech) in this story.
- GOOGL Alphabet-18.8% 30d
Alphabet (computer programming, data processing, etc.): big tech's AI spending and demand drive its shares. Linked by “big tech” (AI and big tech) in this story.
- AMZN Amazon.com-3.7% 30d
Amazon.com (catalog and mail-order houses): big tech's AI spending and demand drive its shares. Linked by “big tech” (AI and big tech) in this story.
- META Meta Platforms-6.1% 30d
Meta Platforms (computer programming, data processing, etc.): big tech's AI spending and demand drive its shares. Linked by “big tech” (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 |
|---|---|---|---|---|---|---|---|
| QQQ | -1.57% | +0.81% | base | -2.96% | after close | after close | after close |
| AIQNo price data for this ticker | — | — | — | — | — | — | — |
| MSFTNo price data for this ticker | — | — | — | — | — | — | — |
| GOOGLNo price data for this ticker | — | — | — | — | — | — | — |
| AMZNNo price data for this ticker | — | — | — | — | — | — | — |
| METANo price data for this ticker | — | — | — | — | — | — | — |
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.
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Many Big Tech stocks were hit hard but the S&P 500 showed strength under the surface, with a majority of stocks showing gains for the month.
Source: MarketWatch
This story
| Company | When | Move | Status |
|---|---|---|---|
| QQQ | that day | -2.96% | still updating |
| QQQ | three days earlier | +0.81% | final price |
| QQQ | five days earlier | -1.57% | final price |
Congressional trades in the stocks in this story
- Rep. Pete Sessions sold Microsoft (MSFT) (held by a spouse), worth $250,001 - $500,000 on 2 Oct 2026. That is 28 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 30 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 32 days before publication. Filed 2 Oct 2026. View the filing.
- Rep. Pete Sessions sold Alphabet (GOOGL), worth $15,001 - $50,000 on 14 Sep 2026. That is 46 days before publication. Filed 18 Sep 2026. View the filing.
- Rep. Rohit Khanna sold Alphabet (GOOGL) (held by a spouse), worth $1,001 - $15,000 on 4 Sep 2026. That is 56 days before publication. Filed 7 Oct 2026. View the filing.
- Rep. Thomas H. Kean Jr sold Alphabet (GOOGL), worth $1,001 - $15,000 on 27 Aug 2026. That is 64 days before publication. Filed 12 Sep 2026. View the filing.
- Rep. Pete Sessions sold Amazon Com (AMZN), worth $15,001 - $50,000 on 27 Oct 2026. That is 3 days before publication. Filed 27 Oct 2026. View the filing.
- Rep. Pete Sessions sold Amazon Com (AMZN) (held by a spouse), worth $100,001 - $250,000 on 2 Oct 2026. That is 28 days before publication. Filed 27 Oct 2026. View the filing.
- Rep. Michael T. McCaul sold Amazon Com (AMZN) (held by a spouse), worth $1,001 - $15,000 on 28 Aug 2026. That is 63 days before publication. Filed 14 Oct 2026. View the filing.
- Rep. Maria Elvira Salazar sold Meta Platforms (META), worth $1,001 - $15,000 on 24 Sep 2026. That is 36 days before publication. Filed 7 Oct 2026. View the filing.
- Rep. Rohit Khanna bought Meta Platforms (META) (held by a dependent child), worth $1,001 - $15,000 on 23 Sep 2026. That is 37 days before publication. Filed 7 Oct 2026. View the filing.
- Rep. Maria Elvira Salazar bought Meta Platforms (META), worth $1,001 - $15,000 on 22 Sep 2026. That is 38 days before publication. Filed 7 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
12 out of 100Price not final
“In a wild October for markets, these stocks were the biggest winners and losers” scores 12 out of 100. The score uses 1 sources. The price is not final yet.