US equity indexes closed sharply higher on Monday, September 21, 2026, led by a semiconductor rally and a steep drop in crude oil that pulled bond yields lower. The S&P 500 finished up 1.49% at a five-week high, the Dow Jones Industrial Average added 0.71%, and the Nasdaq 100 rose 2.83% to a three-month high, Nasdaq reported.
October WTI crude fell more than 4% to a 1.5-week low, and the 10-year T-note yield slipped to 4.959%. Nasdaq attributed the oil move to diplomatic efforts to end the US-Iran war and to signs that crude flows were still passing through the Strait of Hormuz. President Trump said he would “probably” be open to meeting Iranian President Masoud Pezeshkian on the sidelines of this week’s UN General Assembly in New York, while Admiral Brad Cooper, head of US Central Command, said crude and LNG flows through the strait over the past two weeks were running at a six-month high.
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Key facts
- The S&P 500 closed up 1.49%, the Dow gained 0.71%, and the Nasdaq 100 rose 2.83%; December E-mini S&P futures added 1.50% and December E-mini Nasdaq futures 2.84%.
- October WTI crude sank more than 4% to a 1.5-week low, while the 10-year T-note yield fell to 4.959%.
- Bitcoin rose more than 7% to a 7.5-month high, extending Friday’s 5% gain, after the SEC advanced a plan to let digital versions of securities trade in the US.
- Chip stocks led: Arm Holdings closed up more than 16%, Intel more than 12%, AMD and Qualcomm more than 9%, and the iShares Semiconductor ETF more than 4%.
- Markets are pricing a 55% chance of a 25 basis point Fed rate hike at the October 27-28 FOMC meeting.
Chips, crypto and travel stocks lead the move
Semiconductor and AI-infrastructure shares did most of the heavy lifting. Arm Holdings gained more than 16% to top the Nasdaq 100, Intel added more than 12% to lead the S&P 500, and AMD and Qualcomm each closed up more than 9%. Marvell Technology rose more than 6%; Applied Materials and Lam Research each added more than 5%; KLA Corp gained more than 4%.
The Magnificent Seven also moved higher. Meta Platforms climbed more than 11% after its new Muse artificial intelligence app reached the top of mobile app charts, Tesla rose 3%, Nvidia gained more than 2%, and Alphabet, Amazon.com and Microsoft each added more than 1%. Apple closed up 0.85%.
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Crypto-exposed equities tracked Bitcoin’s advance. Strategy rose more than 9%, BitMine Immersion Technologies more than 7%, and Bullish and Galaxy Digital Holdings more than 5%. Coinbase Global added more than 3%, Circle Internet Group and Robinhood Markets more than 2%, and Riot Platforms and Iren more than 1%.
Cheaper fuel lifted airlines and cruise operators: United Airlines Holdings gained more than 5%, American Airlines Group more than 4%, and Delta Air Lines and Alaska Air Group more than 3%. Energy producers moved the other way, with Marathon Petroleum down more than 5% to lead S&P 500 decliners and Chevron down more than 2% to lead Dow losers.
Rate path still hangs over the rally
Hawkish comments from two regional Fed presidents cut into the gains. Chicago Fed President Austan Goolsbee said restoring price stability may require further rate increases and a narrower gap between supply and demand, which could weigh on employment, wages and growth. St. Louis Fed President Alberto Musalem said core inflation may be running a full percentage point above the Fed’s 2% target and that further hikes are likely needed. December 10-year T-notes still closed up 7 ticks.
Warner Bros. Discovery jumped more than 10% after Paramount Skydance settled lawsuits from 12 state attorneys general and the Writers Guild union, clearing the way for Paramount’s acquisition. Ciena gained more than 5% on an Evercore ISI upgrade, and Candel Therapeutics rose more than 3% on a Bank of America upgrade. HP Inc. fell more than 4% after projecting mid-single-digit declines in industry-wide PC unit volumes in 2027.
Overseas, the Euro Stoxx 50 closed up 1.31% and China’s Shanghai Composite added 0.97% to a 1.5-week high. Japan’s Nikkei-225 did not trade, with markets closed for the Respect-for-the-Aged Day holiday.
Why it matters
The session shows how tightly US equities are now tied to two inputs: the oil price and the direction of interest rates. A sustained fall in crude eases the inflation pressure that has kept the Fed in a tightening posture, which is why energy producers sold off while airlines, cruise lines and rate-sensitive growth names rallied together. The chip and AI complex, which carries heavy index weight, amplified the move in both directions.
For crypto holders, the SEC’s step toward tokenized securities is the more consequential detail, since it links digital-asset demand to mainstream market plumbing rather than to a standalone crypto cycle.
What to watch
Two events sit directly ahead. The Trump-Xi summit later this week will shape trade, AI and investment expectations, with US Trade Representative Jamieson Greer saying the focus is stability between the two countries and a trade truce extension. The next FOMC meeting on October 27-28 will decide whether the Fed hikes a further 25 basis points, a 55% probability in current market pricing. Germany’s Bundesbank also said on Monday that Q3 GDP will expand only “modestly” and flagged high energy prices as a risk to the inflation outlook.
Nothing here is financial advice, and markets can move against any of the expectations described above.
Source: Nasdaq
