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The AI spending bet

Big tech is spending hundreds of billions on AI data centers, and stocks swing on whether it pays off.

Microsoft, Amazon, Alphabet and Meta each plan to spend well over $100 billion this year on AI data centers. That money becomes sales for chipmakers like Nvidia, AMD, Broadcom and TSMC, so their stocks rise together when spending plans grow. The spenders' own stocks rise only when cloud sales show the money is earning a return, as at Microsoft and Amazon in July. When spending grows faster than sales, investors sell. Companies betting their own products on AI, like Tesla, face the same test: spending now, payoff later.

Where it stands Alphabet had its worst day ever Oct. 29 after its cash flow turned negative. The Nasdaq fell 2.9% Oct. 30, its worst month since March 2025.

Who wins, who loses

Tends to rise
Tends to fall
  • Meta PlatformsMETA
    +5.5% in 3 months

    Fell 6.5% in July when AI spending left only $784 million of free cash flow (cash left after spending) for the quarter.

    Read the breakdown →
  • Alphabet Class AGOOGL
    -22.7% in 3 months

    Fell 7.8% in July after raising its 2026 spending forecast to $195 billion to $205 billion, before cloud results elsewhere lifted it.

    Read the breakdown →
  • TeslaTSLA
    +23.9% in 3 months

    Fell 17.8% in July after a profit miss and a plan to spend over $25 billion this year on robotaxis and robots.

    Read the breakdown →

When it moved markets

  1. Week of Oct 26Alphabet fell about 13% on Oct. 29, its worst day ever, after free cash flow came in at negative $9.1B. On Oct. 30 Amazon slipped 1.4% after burning $42.4B over 12 months, Nvidia fell 4.2% and the Nasdaq 2.9%.
  2. Week of Oct 19AMD fell 8.1% and TSMC 4.5% on Oct. 22 as AI spending worries hit tech; Meta fell 8.5% for the week on a $135B to $145B spending plan.
  3. Week of Oct 12Chip stocks slipped again Monday as investors rotated into energy; Nvidia fell 1.3%, AMD 2.3% and TSMC 2%.
  4. Week of Oct 5Nvidia hit a record Monday but fell 2.0% for the week after a report that OpenAI's revenue is below rumors; Micron fell 4.3%.
  5. Week of Sep 28Nvidia led Friday's tech rally to a record of $237.87 after the weak jobs report, rising 3.9% for the week.
  6. Week of Sep 21Chip stocks rallied and AMD passed $1 trillion in market value. Qualcomm, Intel, AMD and Marvell rose between 7.2% and 13.6%.
  7. Week of Sep 7Chipmakers rallied on a server processor shortage and Qualcomm's deal to build AI data center hardware with Amazon; AMD rose 8.1%.
  8. Week of Aug 24Nvidia jumped 8.7% Thursday after beating forecasts but ended the week up 1.3%; Marvell fell 8.6% on a weak margin forecast.
  9. Week of Aug 10Results from CoreWeave and Super Micro reassured investors about AI demand, and Micron rose 10.7%.
  10. Week of Jul 27Microsoft rose 21.8% and Amazon 17% as faster cloud growth showed AI spending paying off; Meta fell 6.5% on thin cash flow.
  11. Week of Jul 20Alphabet fell 7.8% after raising its spending forecast, and Tesla fell 17.8% on a profit miss and heavier spending.
  12. Week of Jul 13TSMC said its spending would run higher than expected, and the Philadelphia chip index entered a bear market.
  13. Week of Jul 6Meta had its best week since early 2024 on signs it is cutting the cost of running its AI.
  14. Week of Jun 29Chipmakers fell as investors took profits after a first half in which the group rose more than 80%.
  15. Week of Jun 15Chip stocks led Thursday's rally; Marvell rose 11% for the week and Broadcom 7.7%.
  16. Week of Jun 8Intel rose 25.6% on a report that Google ordered more than 3 million AI chips to be made in Intel's factories.

Sources

  1. 1Stock Market Today, June 8: Intel Surges on Reported Google AI Chip Foundry Order · The Motley Fool, 2026-06-08
  2. 2Stock Market Today, June 18: Marvell Technology Surges on Price Target Hike · The Motley Fool via Yahoo Finance, 2026-06-18
  3. 3Dow jumps nearly 600 points to record close; Nasdaq slides as chip stocks suffer: Live updates · CNBC, 2026-07-02
  4. 4S&P 500 closes higher to notch a winning week, helped by tech gains · CNBC, 2026-07-10
  5. 5Stock market today: Dow, S&P 500, Nasdaq post weekly losses as semiconductors get smoked · Yahoo Finance, 2026-07-17
  6. 6Tesla tumbles 14% to 11-month low as profit miss, capex spending outlook weighs on stock · Yahoo Finance, 2026-07-23
  7. 7Alphabet plunges 7% as higher AI spending outlook rattles investors · Investing.com, 2026-07-23
  8. 8Microsoft jumps 8% as it boosts capital spending plans, citing demand · CNBC, 2026-07-29
  9. 9Microsoft sets record with near $450 billion single-day gain in market value · Reuters via WHBL, 2026-07-30
  10. 10Amazon soars as cloud revenue surge allays fears over ballooning AI bets · Reuters (via Investing.com), 2026-07-31
  11. 11Alphabet, Amazon and Microsoft added nearly $1.5 trillion in combined value this week · CNBC, 2026-07-31
  12. 12Meta's stock drops on disappointing guidance, dwindling free cash flow · CNBC, 2026-07-29
  13. 13S&P 500 closes at a new record, buoyed by cooler-than-expected inflation data and falling oil prices · CNBC, 2026-08-13
  14. 14S&P 500, Nasdaq Composite close higher Thursday as Nvidia rallies on revenue guidance: Live updates · CNBC, 2026-08-27
  15. 15Intel Leads Chip Stocks Rally as Qualcomm, AMD and Broadcom Stocks Jump · GuruFocus via Yahoo Finance, 2026-09-08
  16. 16Stock market today: Nasdaq surges 2% to record high, Dow and S&P 500 gain as chip stocks rally, oil falls · Yahoo Finance, 2026-09-21
  17. 17AMD hits $1 trillion market cap for the first time as stock rides 5-day rally · CNBC, 2026-09-21
  18. 18Markets News, Oct. 2, 2026: Indexes Rise Friday After Weak Jobs Report; Nasdaq Hits New High; Dow, S&P 500 Book Weekly Losses · Yahoo Finance, 2026-10-02
  19. 19Stock market today: Nasdaq, Nvidia post record highs as tech strength outshines bond weakness · Yahoo Finance, 2026-10-05
  20. 20US Stocks Retreat on Tech Selloff · Trading Economics, 2026-10-08
  21. 21How major US stock indexes fared Monday, 10/12/2026 · AP via La Nacion, 2026-10-12
  22. 22Alphabet tanks nearly 13% for worst day ever, losing $500 billion in value · CNBC, 2026-10-29
  23. 23Alphabet announces third quarter 2026 results (Exhibit 99.1) · Alphabet via SEC EDGAR, 2026-10-28
  24. 24Amazon, Intel shares fall after earnings amid AI spending concerns · CNBC, 2026-10-30
  25. 25Wall Street drops to its worst day since June after the sell-off for tech stocks deepens · AP via BNN Bloomberg, 2026-10-30