Wall Street ends higher on AI optimism; AMD hits $1 trillion value

The S&P 500 and Nasdaq closed sharply higher on Monday as gains in AI-linked stocks and a retreat in Treasury yields lifted sentiment. Preliminary data showed the S&P 500 up 1.49% at 7,764.22, the Nasdaq up 2.26% at 27,122.09 and the Dow up 0.72% at 52,053.88. Advanced Micro Devices reached a $1 trillion market capitalisation for the first time. The 10-year yield fell below 5% and Brent settled at $100.34. CME's FedWatch showed traders see a 50% chance of another Fed hike next month.

Written by AI from Livemint — Markets · not yet reviewed by an editor · Published 22 Sept 2026, 2:13 am IST

Source

Livemint — Markets · read the original report ↗

#wall street#stock markets#ai stocks#amd#treasury yields#federal reserve

Desk check · compared with the source

What the desk checked (5)

S&P 500 rose 113.72 points (1.49%) to 7,764.22; Nasdaq gained 599.55 points (2.26%) to 27,122.09; Dow rose 371.24 points (0.72%) to 52,053.88 — Figures appear in source, explicitly described as preliminary data
Advanced Micro Devices reached a $1 trillion market capitalisation for the first time — Stated in source without attribution to a specific data provider
Traders see a 50% chance of another Fed rate hike next month — Attributed in source to CME's FedWatch
Brent crude dipped below $100 a barrel, its lowest since September 9, settling at $100.34 — Figure appears in source; no data provider named
Paramount Skydance reached a settlement with California and 11 other states over its $110 billion merger with Warner Bros Discovery — Attributed to an unnamed source speaking to Reuters

Written by AI from Livemint — Markets · not yet reviewed by an editor · How we use AI · Report an error

Analysts’ view opinion

AI Economic Analyst

This is a market running on the AI capex story, and AMD crossing a $1 trillion valuation is its symbol. But Monday's rally was really powered by two macro variables: the 10-year Treasury yield slipping below 5% and Brent crude easing back to around $100. Both were headwinds days ago and are tailwinds now — which tells you the foundation of these gains is as reversible as it is real.

The breadth is narrow — Nasdaq up 2.26% and the S&P up 1.49% against a Dow gain of just 0.72% shows a rally leaning heavily on chip and AI heavyweights.
With the Fed having just raised rates for the first time in three years and traders pricing a 50% chance of another hike next month, the direction of borrowing costs for households and companies remains genuinely unsettled.
Brent around $100 is still expensive oil; this relief rests on hopes around diplomacy, and only if it holds does it feed through to softer fuel, freight and inflation pressure.
The S&P 500 trading near 19 times expected earnings — its cheapest since 2023 — implies earnings expectations have been marked up fast, and because AI names drive much of that rise, concentration risk is building.
Greenland-exposed stocks doubling and tripling, plus bitcoin at a seven-month high, point to a sharp rise in risk appetite rather than a broad economic re-rating.

What to watch — Watch commentary from more than ten central bank policymakers this week and Thursday's US-China summit, including a possible extension of the trade truce — these will set the path for yields and oil, and with it the durability of the rally.

These are preliminary closing figures, and the story does not establish how much AI spending is actually expanding, what the Fed will do next, or whether the drop in oil prices will last.

Deep dive

Research brief · 8 facts · 8 dates · exam-ready

The brief

Context

US equity markets closed sharply higher on Monday, September 21, driven by a rally in AI-linked and semiconductor stocks, a retreat in US Treasury yields from recent highs and a slide in crude oil prices. Advanced Micro Devices (AMD) became the latest chipmaker to cross a $1 trillion market capitalisation. The rebound came a week after safety warnings from leaders of AI giants triggered a global tech selloff, and days after the US Federal Reserve raised interest rates for the first time in three years to fight inflation. Oil eased on speculation of a possible Middle East breakthrough at the UN General Assembly meeting in New York this week.

Key facts

S&P 500 gained 113.72 points, or 1.49%, to close at 7,764.22, according to preliminary data.
Nasdaq Composite rose 599.55 points, or 2.26%, to 27,122.09; Dow Jones Industrial Average rose 371.24 points, or 0.72%, to 52,053.88.
Advanced Micro Devices reached a market capitalisation of $1 trillion for the first time; Intel and Arm Holdings also surged.
The benchmark US 10-year Treasury yield fell below the psychologically important 5% level.
Brent crude dipped below $100 a barrel to its lowest since September 9, later settling at $100.34 per barrel.
CME's FedWatch showed traders see a 50% chance of another Fed rate hike next month; the Fed raised rates last week for the first time in three years.
The S&P 500 traded last Friday at just under 19 times expected earnings, its lowest valuation since 2023, per LSEG data.
Paramount Skydance fell after a source said it settled with California and 11 other states suing to block its $110 billion merger with Warner Bros Discovery.

Timeline

September 9Previous low point for Brent crude that Monday's dip matched, per the source.
About a week before September 21Safety warnings from leaders of AI giants triggered a global tech selloff.
Week before September 21US Federal Reserve raised interest rates for the first time in three years to fight inflation.
Friday (before September 21)S&P 500 traded at just under 19 times expected earnings, its lowest valuation since 2023 (LSEG).
Weekend before September 21Washington and Tehran exchanged threats; Trump said he would be open to meeting Iranian President Masoud Pezeshkian.
Monday, September 21S&P 500 and Nasdaq ended sharply higher; AMD hit $1 trillion valuation; 10-year yield fell below 5%.
Week of September 21UN General Assembly in New York; commentary due from at least 10 central bank policymakers.
Thursday (week of September 21)Chinese-US summit expected to cover extending the trade truce, the Iran war and AI regulation.

Who has a stake

Advanced Micro Devices (AMD) — Became the latest chipmaker to reach a $1 trillion market capitalisation, validating investor bets on AI chip demand.
US Federal Reserve — Having raised rates for the first time in three years, faces market pricing of a 50% chance of another hike next month.
Equity investors and traders — Gains hinge on AI spending momentum, the 10-year yield staying below 5% and oil below $100.
Meta — Shares soared after Wells Fargo raised its price target following the launch of its Muse AI assistant.
Paramount Skydance and Warner Bros Discovery — Their $110 billion merger faces state lawsuits; a settlement reported with California and 11 other states.
US, Iran and UN General Assembly participants — Talk of a Middle East breakthrough drove crude prices lower; Trump signalled openness to meeting President Pezeshkian.
US and China — Thursday summit could extend the trade truce; the US proposed six months while China sought a longer extension.
Greenland-exposed companies — Greenland Mines tripled and Greenland Energy more than doubled on US-Denmark diplomatic progress over Greenland's status.

Why it matters

Wall Street's direction, US bond yields and crude prices shape global risk appetite and capital flows into markets like India. The session showed how sharply sentiment now swings on two variables — the AI capital-spending cycle and the interest-rate path — with a 50% market-implied chance of another Fed hike keeping the rally fragile. Geopolitics, from Iran talks to the US-China trade truce and Greenland, is also directly moving asset prices.

UPSC angle

Prelims pointers

S&P 500 closed at 7,764.22 (+1.49%), Nasdaq at 27,122.09 (+2.26%), Dow at 52,053.88 (+0.72%) on Monday, September 21 (preliminary data).
AMD became the latest chipmaker to hit a $1 trillion market capitalisation.
CME FedWatch is the tool tracking market-implied probabilities of US Fed rate moves; it showed a 50% chance of a hike next month.
Brent crude settled at $100.34 a barrel, its lowest since September 9; US 10-year yield fell below 5%.
S&P 500 forward P/E was just under 19 times expected earnings last Friday, lowest since 2023 (LSEG).
Paramount Skydance's merger with Warner Bros Discovery is valued at $110 billion.

Mains framing

Monday's rally on Wall Street illustrates a market driven by two competing forces: an expanding artificial-intelligence capital expenditure cycle that is lifting earnings expectations, and a tightening monetary environment after the US Federal Reserve raised rates for the first time in three years to fight inflation. AI and chip heavyweights — AMD crossing a $1 trillion valuation, alongside Intel, Arm and Meta — are doing much of the heavy lifting in index gains and earnings upgrades, which concentrates market risk in a narrow set of stocks; the source notes leaders of AI giants had issued safety warnings a week earlier that triggered a global tech selloff, showing how quickly sentiment can reverse. Simultaneously, macro variables act as switches: a 10-year Treasury yield falling below the symbolic 5% mark and Brent easing below $100 turned "headwinds into tailwinds," in the words of B. Riley Wealth's Art Hogan, while traders still assign a 50% probability to another hike next month. Geopolitics is an equally direct price-setter — prospects of US-Iran engagement at the UN General Assembly, a US-China summit that may extend the trade truce, and US-Denmark talks on Greenland all moved specific stocks. The way forward for investors and policymakers lies in distinguishing durable AI-driven earnings from valuation froth, watching the commentary of at least 10 central bank policymakers due this week, and building resilience against oil and yield shocks rather than assuming near-term tailwinds will persist.

Key terms

Market capitalisation: Total market value of a listed company's shares; AMD crossed $1 trillion for the first time.
CME FedWatch: CME tool that converts futures pricing into implied probabilities of US Federal Reserve rate decisions.
US 10-year Treasury yield: Benchmark long-term US government bond yield; it fell below the psychologically important 5% level.
Brent crude futures: Global benchmark oil contract; it dipped below $100 and settled at $100.34 a barrel.
Forward price-to-earnings ratio: Price relative to expected earnings; the S&P 500 was at just under 19 times, its lowest valuation since 2023.
Trade truce (US-China): Pause in tariff escalation; the US proposed a six-month extension while China sought a longer one.

Practice questions

Examine how movements in US Treasury yields and crude oil prices transmit to global equity markets. Illustrate with the September 21 Wall Street session.
The concentration of index gains in a few AI-linked stocks raises systemic concerns. Discuss the risks of narrow market leadership for investors and regulators.
How do geopolitical negotiations — on Iran, US-China trade and Greenland — directly influence asset prices? Analyse with examples from the source.

Grounded only in the source report — figures and dates are the source's, not inferred.

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