US Market Breakdown: Meta's AI Bill and $116 Oil, Week of 19 October 2026

The bill for the artificial intelligence build-out landed on the mat last week, and Wall Street did not much like the total. Meta Platforms spent $34.9bn on capital projects in a single quarter and posted negative free cash flow of $2.1bn — its first cash outflow in more than a decade — and the shares fell 6.98% on Thursday to $648.85. That one stock dragged the Nasdaq Composite down 2.6% to 26,008.86, its worst session since 5 June, and pulled the S&P 500 down 1.21% to 7,663.43, its weakest day since July.

A second shock came from the oil market. Brent crude settled on Friday at $116.72 a barrel, up 3.14% on the day and roughly 6% on the week, its highest settlement since late April, after attacks on Saudi energy infrastructure revived supply fears. Higher fuel and freight costs are an inflation problem as much as an energy one, and the Dow Jones Industrial Average shed 652.82 points on Friday as the selling spread well beyond technology.

Yet this was not a rout. The Dow still finished the week higher, energy and healthcare rose, small caps beat the megacaps handily, and by Monday the AI trade had steadied.

Wall Street

The week divided cleanly in two. Monday through Wednesday was a steady grind higher: the S&P 500 closed Monday at 7,690.73, added 0.28% on Tuesday and a further 0.58% on Wednesday to 7,757.17. The Dow did better still, climbing 529.85 points (1.02%) on Tuesday and another 360.21 points (0.69%) on Wednesday to 52,856.09. The Nasdaq rose more than 1% on Monday, was flat on Tuesday at 26,424.82, then gained 1.05% to 26,702.86.

Thursday undid all of it for the technology indices. The Nasdaq's 2.6% fall was its biggest since a 4.2% drop on 5 June, and the Philadelphia Semiconductor Index — the SOX, the standard American gauge of chip shares — fell 6.72% with all 30 of its constituents lower. The Dow, which carries far less technology weight, finished Thursday up 11.89 points at 52,867.98, and Associated Press data showed most stocks in the broader market rose that day. The damage was narrow.

Friday reversed the shape, with technology steadying while oil-driven selling hit industrials and consumer names: the Dow fell 1.23% to 52,215.16, the S&P 500 lost 0.52% to 7,623.68 and the Nasdaq slipped just 0.21% to 25,955.34. Over the five sessions the S&P 500 was down about 0.5%, the Nasdaq down roughly 0.7% for a second consecutive weekly loss, and the Dow up around 0.4% for a third straight weekly gain. The Russell 2000 small-cap index was the standout, up 2.00% to 2,775.90, and the Vix volatility index ended at 19.45.

Monday 26 October, the most recent completed session, clawed some of it back. The S&P 500 rose 0.70% to 7,676.77, the Nasdaq 0.82% to 26,169.38 and the Dow 0.28% to 52,361.58, with chipmakers leading after Anthropic filed to go public.

The week's biggest movers

Meta Platforms was the week's defining name. Third-quarter revenue of $64.6bn was up 26% on the year and ahead of the roughly $63.3bn expected, and adjusted earnings of $7.40 a share comfortably beat the $5.89 forecast. But reported net income was just $9.9bn, or $3.83 a share, after a $9.89bn charge for a multi-state settlement with attorneys general over teen mental health. With capital spending guided to $135bn–$145bn for 2026, investors focused on the cash, not the profit. The shares closed Friday at $642.62, valuing the company at about $1.64tn.

Moderna was the worst performer in the S&P 500 on Thursday, closing down about 17.6% after trading as much as 25% lower intraday. Results for intismeran, its personalised cancer vaccine developed with Merck, appeared briefly on a medical news site two days before their scheduled presentation at the ESMO congress. The data looked solid, with the primary endpoint met, but the stock had run hard this year and the reaction was a textbook sell-the-news.

AMD fell 8.1% on Thursday to $507.93, its worst day of a bruising week that left the shares down about 11.7%. Nothing company-specific went wrong; the chip complex simply re-priced AI capital spending. Benzinga noted AMD had gained more than 140% in 2026 before the pullback.

Lam Research dropped as much as 9% on Thursday, and supplied the week's most concrete reason to worry. On record September-quarter revenue of $8.22bn and earnings of $2.20 a share, both ahead of forecasts, finance chief Doug Bettinger said December-quarter guidance "would have been a bit higher if not for some near-term supply chain constraints", while chief executive Tim Archer warned clean-room space and component shortages would keep limiting output into 2027.

Super Micro Computer went the other way, rising 9.55% on Wednesday to $35.57 after lifting preliminary first-quarter revenue guidance to $18.5bn–$19.5bn from $14.5bn–$15.5bn and its gross margin estimate to 12.0%–12.5%. Dell Technologies rose about 7% in sympathy.

AT&T fell 6.4% on Wednesday despite beating and raising. Adjusted earnings of $0.65 a share were up 20.4% year on year, fibre net additions reached 442,000 and full-year guidance went up to about $2.40. What spooked holders was the balance sheet: net debt to adjusted EBITDA jumped to 3.13 times from 2.68 times after the $23bn EchoStar spectrum purchase, pushing the deleveraging target out towards 2029. Verizon fell 2.2% and T-Mobile 2.5% alongside it.

Crown Castle was Friday's best S&P 500 performer, up around 9%, on reports that SpaceX is in talks to lease its tower sites as it pursues a role as a fourth nationwide American carrier. It had already reported adjusted funds from operations of $1.24 a share against $1.20 expected, on revenue of $995m that missed forecasts of roughly $1.01bn.

Company news in focus

The biggest deal news broke on Monday, when Bloomberg reported that DoorDash is in advanced talks to buy Maplebear, the listed parent of Instacart, for about $17bn. Maplebear closed at $60.88, a market value of roughly $14.1bn, while DoorDash fell 6.1% to $168.44. Uber had explored a bid but is no longer in active discussions. Nothing is signed, and both sides declined to comment.

Meta followed its results with a funding announcement that explains the Thursday sell-off better than any broker note. On Monday it launched roughly $35bn of offerings — $22.5bn of common stock and $12.5bn of convertible securities — as the first instalment of a programme of up to $95bn, with a further $60bn of share sales pencilled in for early 2027. Reporting indicated that Nvidia, AMD and Broadcom have each expressed interest in buying Meta Class A shares, up to $5bn between them. Meta also confirmed a two-for-one split delivered as a new non-voting Class C share, expected to begin trading in late January 2027.

Anthropic filed its S-1 on Monday, seeking a Nasdaq listing. Coverage put first-half 2026 revenue at about $16.3bn against a net loss of $80.7bn, most of it non-cash, with press reports suggesting a valuation target approaching $2tn. The read-across for listed investors is indirect but real: Amazon and Alphabet are both backers and compute suppliers, and the filing reportedly caps Amazon's holding at 12%.

Two regulatory decisions landed in the same 48 hours. Intercontinental Exchange, owner of the New York Stock Exchange, cleared its US antitrust hurdle for the $167-a-share cash takeover of MarketAxess, with early termination of the Hart-Scott-Rodino waiting period effective 21 October; a shareholder vote still stands in the way. The same day the Federal Trade Commission went the other way on radiopharmaceuticals, issuing second requests over Curium's roughly $8bn purchase of Lantheus at $102.50 a share plus a contingent value right of up to $12. Both deals are still guided to close in the first half of 2027.

Nvidia also used its GTC event in Germany on 21 October to disclose a substrate partnership with Samsung Electro-Mechanics. Korea's Maeil Business Newspaper, relayed by Reuters, reported that Nvidia and Tesla will together put about $2.8bn into the supplier's advanced packaging lines, with Tesla's contribution tied to priority supply from 2029 to 2033. None of the companies has confirmed the figures.

Earnings in focus

Netflix reported on Tuesday 20 October. Third-quarter revenue of $12.87bn was up about 12% and in line, earnings of $0.87 a share beat the $0.82 expected and net income reached $3.664bn — and the shares still fell about 6% after hours, to a two-year low. The problem was the outlook: fourth-quarter revenue guidance of roughly $13.4bn, full-year revenue pinned to the low end of its range at $51.1bn, and a full-year advertising target cut to about $2.7bn from $3bn. American companies report quarterly rather than half-yearly, and guidance usually moves the price more than the quarter does.

Tesla reported the same evening as Meta. Adjusted earnings of $0.48 a share beat the roughly $0.45 expected on revenue of $28.05bn, with automotive revenue down 3% year on year and free cash flow of $1.53bn, 62% lower than a year earlier. The sticking point was a cut to 2026 capital spending, to about $20bn from more than $25bn, which investors read as a slower AI and robotics push rather than welcome discipline. The shares fell about 2% on Thursday before rebounding more than 5% on Monday.

Elsewhere the quarter was better than the share prices suggested. IBM beat on both lines, revenue up 5% to $17.1bn and software up 8% to $7.8bn, closing Wednesday 3.94% higher at $251.46 before giving ground after hours. GE Aerospace, reporting Tuesday, delivered adjusted earnings of $2.25 a share against $2.02 expected on revenue of $13.29bn versus $12.65bn forecast, and its shares were still down about 4% over the week to Thursday.

Sectors in focus

Morningstar's weekly sector data put energy top, up 1.56%, with healthcare close behind at 1.52%. Communication services was the worst at -2.8%, which is almost entirely a Meta story given its weight there, with industrials next at -2.07% as oil costs bit. On Friday the oilfield services names did the heavy lifting: SLB, Halliburton and Devon Energy all rallied as Brent pushed to a six-month high.

The concentration point is worth labouring. Six of the ten largest companies in the S&P 500 fell over the week while the average stock rose, and the Russell 2000's 2.00% gain against the Nasdaq's 0.7% loss says the same from the other end. For anyone holding an S&P 500 tracker, a market-value-weighted fund delivered the megacap result, not the average one. The SOX's 6.72% single-day fall, with no constituent spared, shows how tightly the chip complex is now bound to one variable: expectations for AI capital spending.

Macro and the Fed

Treasury yields fell despite the oil move. The 10-year note yielded 5.15% on Monday, eased to 4.96% by Thursday and finished Friday at 5.00%, a net fall of around nine basis points; the two-year ended at 4.69%. The Federal Reserve's target range stands at 3.75%–4.00% after September's increase, and CME futures priced roughly a 90% chance of no change at Wednesday's meeting. Note the direction of travel: markets expect this central bank to tighten again, most likely in December — the opposite of the Bank of England debate British readers are used to.

Commodities carried the inflation story. Brent settled at $116.72 and West Texas Intermediate at $103.27 on Friday, both up more than 3% on the day, after reports of Houthi attacks on Saudi energy assets. Gold went the other way, ending Friday around $4,012 an ounce, down about 3.8% from $4,168 a week earlier and its steepest weekly fall since June, as firmer yields and a stronger dollar sapped demand for a non-yielding asset. Silver fell to $54.65, a three-month low. The dollar index stood at 101.88 on Monday, and a firmer dollar flatters US returns converted into sterling.

Still to come

Consensus going into Thursday's data is for third-quarter GDP growth of about 3.0% annualised against 2.2% in the second quarter, with headline PCE expected to have risen 0.5% month on month in September. Both land the morning after the Fed decision.

This article is for information and education only. It is not financial advice or a recommendation to buy, sell or hold any investment. Always do your own research.