Weekly Market Wrap: AI debt fears hit the Nasdaq as Brent pushes back above $100

The AI trade suffered its sharpest setback in months as inflation, rising borrowing costs and a debt scare at CoreWeave hit technology shares together.

The Nasdaq Composite fell 4.5% for the week, its worst performance since June, while the S&P 500 lost 1.9%. Semiconductor shares extended an eight-session slide and heavily indebted data-centre operators came under particular pressure. CoreWeave fell almost 25% over five sessions as investors questioned whether its $50 billion debt load can be serviced before AI infrastructure spending produces enough cash flow.

Oil moved in the opposite direction. Brent briefly touched $110 a barrel and settled near that level, its highest close since May, after renewed disruption risk around the Middle East and Russian energy infrastructure revived supply concerns.

Australian shares took a different path. The ASX 200 gained 1.0% for the week as banks and defensive sectors offset weakness in data-centre, technology and resource shares. The split gave the local market a more interesting setup than the headline gain suggests: capital moved away from companies dependent on future growth and into businesses with nearer-term earnings, dividends or exposure to higher energy prices.

CFDs allow traders to take a long or short position on the US Tech 100, Australia 200 and Brent crude as the gap between growth shares, energy stocks and defensive sectors widens. Stop-loss and take-profit orders can help define risk around earnings, inflation data and geopolitical headlines.

Open a Trading Account

      “Trade CFDs with an ASIC-regulated broker. Fast AUD funding via PayID. ”  

The AI rally has rewarded companies that sell chips, cloud capacity, networking equipment and data-centre infrastructure. Nvidia, Broadcom, Oracle and their suppliers have all benefited from the expectation that large technology groups will keep spending heavily to build more computing capacity.

The sell-off showed investors are now looking beyond demand forecasts. They want to know how much debt is being used to finance the buildout, how quickly new capacity can be filled, and whether customers will generate enough revenue to justify the cost.

CoreWeave became the clearest pressure point. Its bonds maturing in 2031 briefly yielded more than 16%, while the cost of insuring its debt surged above 1,000 basis points. Those are credit-market signals that investors see a much higher risk of financial strain, even if the company’s order book remains substantial.

The concern spread because CoreWeave sits at the debt-heavy end of the same infrastructure cycle that has supported larger technology names. Oracle and other companies are better capitalised, but they are still exposed to the question of whether the returns from AI data centres will match the scale of the capital spending.

Demand for advanced computing remains strong, and several companies have reported large customer backlogs. The market has simply become less willing to pay for revenue that may arrive years into the future while borrowing costs are rising now.

September US inflation added to the pressure. Headline CPI rose 0.6% for the month and 3.7% over the year, while core inflation rose 0.3% on the month and 2.6% annually. The core monthly result was above economists’ forecasts and put another Federal Reserve rate increase back into the conversation ahead of its late-October meeting.

For the US Tech 100, the next move will depend on whether upcoming results from Tesla, Meta, Texas Instruments and other large companies can show that AI spending is translating into revenue and margins. Earnings may stabilise the sector; further evidence of expensive funding and delayed returns could extend the repricing.

Brent’s return to $110 changed the sector rotation from a simple technology sell-off into a broader inflation trade.

The price move followed fresh concerns over Middle East supply routes, attacks on Russian energy infrastructure and renewed uncertainty around crude flows through the Strait of Hormuz. The International Energy Agency and the United States have moved to release strategic reserves, but the market remains focused on whether supply disruption will become more severe.

Energy producers were the obvious beneficiaries. ExxonMobil and Chevron reached record highs during the week, while the S&P 500 energy sector also set a fresh peak. Their appeal was straightforward: higher crude prices can lift cash flow quickly, whereas the AI trade asks investors to wait for the payoff from spending that is taking place now.

Oil is not a clean bullish story for equity markets overall. Higher crude feeds into petrol, freight and production costs, making the inflation problem more difficult for central banks. Airlines, consumer shares and highly valued growth companies can all feel the effect, particularly if Brent stays near $110 long enough to lift inflation expectations.

The trade is also highly sensitive to headlines. A further attack on energy infrastructure or a sustained reduction in tanker traffic could push Brent beyond recent highs. Evidence that strategic-reserve releases are working, or that shipping routes are normalising, could remove part of the geopolitical premium quickly.

The Australia 200 rose 1.0% for the week, yet the index was supported by banks, utilities and other defensive sectors rather than a broad appetite for risk.

The local AI and data-centre names felt the global shift. NextDC fell 11.5%, and Megaport lost 12.1% as investors cut exposure to companies most closely linked to the cost of funding technology infrastructure. WiseTech Global moved the other way, gaining 11.8% over the week after regulatory developments reduced one company-specific uncertainty.

The contrast was useful for the Australia 200. Banks benefited from their more immediate earnings profile, while utilities and healthcare provided defensive exposure as global technology shares fell. Materials remained less convincing, with the sector down 2.3% over the week despite a late rebound.

Australian traders now face a market with competing forces. A persistent oil rally can support energy shares but increase pressure on inflation and household spending. Softer expectations for another RBA rate rise may help domestic banks, property stocks and consumer shares, while renewed global AI weakness could still weigh on local technology and data-centre names.

The Australia 200 is therefore not simply following Wall Street lower. It is rotating between its own heavily weighted sectors, which makes bank earnings, energy prices and the next RBA signals more relevant than the Nasdaq’s headline move alone.

US Tech 100: Can earnings stop the AI sell-off?

The US Tech 100 enters the week after its sharpest pullback since June. Tesla, Meta, IBM, Texas Instruments and Lam Research will give traders fresh evidence on AI spending, semiconductor demand and the resilience of large technology earnings.

Strong revenue growth and confident guidance could support a recovery, especially if bond yields stabilise. More cautious capital-expenditure plans, weaker margins or renewed credit stress among data-centre operators would keep the pressure on the index.

Brent crude: Can $110 hold?

Brent has reached a level that is high enough to support energy shares but uncomfortable for inflation-sensitive markets. Traders will watch developments around the Middle East, Russian refining capacity and any further strategic-reserve releases.

A sustained move above recent highs could tighten the link between oil, inflation and central-bank expectations. A de-escalation in supply risk could trigger a sharp fall because much of the latest move is tied to geopolitical risk rather than a sudden improvement in global demand.

Australia 200: Can banks and defensives keep carrying the index?

The Australia 200 outperformed US technology shares this week, but its gains relied on a narrower group of sectors. The next test is whether domestic banks, utilities and healthcare can continue offsetting weakness in miners and technology.

A calmer oil market and lower expectations for further RBA tightening could broaden the local recovery. Another global technology sell-off or renewed inflation concern would leave the index dependent on the same defensive and financial names.

The week ahead will show whether earnings can refocus investors on corporate profits or whether debt concerns will keep controlling the AI trade. Brent remains the other key variable: every move higher increases the chance that inflation and interest rates become the market’s main problem again.

Trade the markets driving the week with Mitrade

The week showed why a single market view can be limiting. Technology shares fell as investors reassessed AI financing, energy benefited from higher crude prices, and Australian financials and defensives held up better than the broader growth trade.

Mitrade gives traders access to global indices, commodities, forex and selected shares from one platform. CFDs can be used to take a long or short position as earnings, oil developments and interest-rate expectations shift, with stop-loss and take-profit orders available to help manage risk.

Start trading global markets in three simple steps