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Why Stocks Fell Oct. 23: Iran Oil Jump
StockCram Editorial4 min readStocks fell Oct. 23 as oil topped $100 on Iran tensions and the 10-year yield hit 4.999%. The Fed and Big Tech earnings arrive this week.
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- •US stocks fell on Friday, October 23, because higher oil and Treasury yields weighed on shares: the Dow dropped 652 points (1.2%) to 52,215, the S&P 500 lost 0.5% to 7,623 and the Nasdaq slipped 0.2% to 25,955.
- •Brent crude settled at a six-month high of $116.72 a barrel and WTI rose 3.8% to $103.27 after Iran warned it would attack if strikes on Tehran resume.
- •The 10-year Treasury yield rose to 4.999% on Friday, and the 2-year yield rose to 4.686%.
- •The Fed decides on rates Wednesday, October 28, at 2 p.m. ET, and Microsoft, Alphabet and Amazon report earnings October 28-29.
Deep DiveToday's Market Movers
Dow drops 652 points as Iran tensions lift oil above $100
What Happened
The Dow Jones Industrial Average fell 1.2% to 52,215 on Friday, October 23, as oil jumped after Iran said it is ready to attack if the U.S. and Israel resume strikes on Tehran. The S&P 500 lost 0.5% to 7,623 and the Nasdaq Composite slipped 0.2% to 25,955. West Texas Intermediate crude rose 3.8% to $103.27 a barrel, up 14% for October so far, and Brent settled at $116.72, its third straight weekly gain. For background on how oil reacts to conflict, see our guide to oil prices during war.
Why It Matters
Pricier oil raises costs for businesses and households and can keep inflation high, which makes it harder for the Fed to ease up. See our Brent crude and WTI crude explainers for the difference between the two benchmarks.
Market Impact
Equities
Dow down 1.2%, S&P 500 down 0.5%, Nasdaq down 0.2%
Rates
Yields rose as higher oil fed inflation worries (10-year up about 5 basis points)
FX
No major move reported in the sources reviewed
Commodities
WTI up 3.8% to $103.27; Brent settled at a six-month high of $116.72
10-year Treasury yield ends the week at 4.999% as AI worries drive investors to bonds
What Happened
The U.S. 10-year Treasury yield rose 5 basis points to 4.999% on Friday, October 23, as crude's climb pushed yields back up after they dipped below 5% on Thursday for the first time in a month. The 2-year yield rose to 4.686%. Investors had moved into bonds earlier in the week over worries about the huge debt tech firms are taking on to build AI networks. CoreWeave's 9.75% bond due 2031 yields 15.637%, a sign of strain in AI-linked borrowing.
Why It Matters
The 10-year yield sets the tone for mortgage and business loan rates, and a 5% level is a high hurdle for stocks. Learn more in why stocks can rise when interest rates are high, or see how the bond yield is measured.
Market Impact
Equities
Tech stocks pressured by AI spending and debt worries
Rates
10-year +5 bps to 4.999%; 2-year +5 bps to 4.686%; 30-year +4 bps to about 5.31%
FX
No major move reported in the sources reviewed
Commodities
Crude above $100 a barrel added to inflation concerns
S&P 500 and Nasdaq end the week lower while the Dow holds a small gain
What Happened
The S&P 500 lost 0.5% and the Nasdaq Composite fell 0.7% for the week ended October 23, as worries about AI spending returned and hit tech shares, while the Dow gained 0.4%. The Cboe Volatility Index, Wall Street's fear gauge, rose 6% on Friday to 20.24 after jumping 14% on Thursday to 19.03.
Why It Matters
A VIX above 20 means traders expect bigger daily swings. Tech's pullback shows how sensitive markets are to AI funding costs, a debate we cover in are we in another AI bubble?
Market Impact
Equities
Week: S&P 500 -0.5%, Nasdaq -0.7%, Dow +0.4%; VIX at 20.24
Rates
Yields ended the week near 5% on the 10-year
FX
No major move reported in the sources reviewed
Commodities
Brent up for a third straight week
Fed meets Wednesday with rates widely expected to stay unchanged
What Happened
The Federal Reserve is set to announce its October policy decision on Wednesday, October 28, at 2 p.m. ET, with Chair Kevin Warsh's news conference at 2:30 p.m. Futures pricing as of October 20 put the odds of a hold at about 83%, with the rest on a quarter-point hike. Recent inflation readings have been warm, especially at the producer level, but several Fed speakers have said there is no rush to raise rates.
Why It Matters
The Fed's rate sets borrowing costs across the economy. Traders will look for hints about December. For context on Warsh's approach, read what Kevin Warsh's first meeting meant.
Market Impact
Equities
Mega-cap earnings land the same week
Rates
Markets see roughly an 83% chance of a hold at 3.75%-4.00%
FX
Dollar direction will hinge on the Fed's message
Commodities
Oil above $100 complicates the inflation picture
Microsoft, Alphabet and Amazon report earnings Wednesday and Thursday
What Happened
Microsoft and Alphabet are due to report quarterly earnings after the close on Wednesday, October 28, and Amazon after the close on Thursday, October 29, following a week when AI spending worries hit tech shares and the Nasdaq fell 0.7%. No regular trading session had taken place yet on Monday, October 26, at the time of writing.
Why It Matters
These firms are among the biggest spenders on AI. Their numbers will show how much they are spending and earning. New to reading results? See our earnings report explainer.
Market Impact
Equities
The three companies carry heavy weight in the S&P 500 and Nasdaq
Rates
Not directly affected
FX
Little direct effect expected
Commodities
Little direct effect expected
Historical Perspective
Similar Event
Oil price spikes tied to Middle East conflict, such as the 2022 surge after Russia invaded Ukraine, have repeatedly raised inflation worries and pressured stocks. For a longer look, see what happens to stocks during wars.
What Happened Then
In 2022, higher energy costs helped push inflation up, and the Fed raised rates sharply while stocks swung widely. Markets calmed once oil prices eased.
What to Watch Next
- →October 28, 2:00 p.m. ET: Federal Reserve policy decision, followed by Chair Warsh's news conference at 2:30 p.m. ET (prior: federal funds target range 3.75%-4.00%)
- →October 28, after the close: Microsoft and Alphabet quarterly earnings, and October 29, after the close: Amazon quarterly earnings
- →October 29: September PCE price index, the Fed's preferred inflation gauge (prior: about 3.4% year over year in August; forecast about 3.7%)
Analysis Confidence
Conviction Level:★★★★★
Key Uncertainties
Friday's close is the latest full session found, and Monday's trading was not covered. The Fed's current rate range comes from a secondary source. Iran-related news could change oil prices quickly.
Sources
- • Kiplinger (2026-10-23)
- • CNBC (2026-10-23)
- • Yahoo Finance (2026-10-23)
- • Kiplinger (economic calendar, Oct. 26-30) (2026-10-24)
- • SentiSense (2026-10-25)
- • BeInCrypto (2026-10-26)