Weekly Market Wrap: AI spending hit a reality check — and Starlink rewrote the telecom trade

US stocks just produced a positive week, but the path was far less comfortable than the final numbers suggest. The S&P 500 gained 1.2%, the Dow added 0.9%, and the Nasdaq rose 0.6% as investors looked ahead to the start of third-quarter earnings season. Yet the week also delivered two sharp reminders that the market’s biggest themes are becoming more complicated. 

First, a sell-off in Oracle, Broadcom and chip stocks reopened questions over the cost of building the AI infrastructure boom. 

Then SpaceX’s US$8 billion spectrum deal sent US and European telecom shares sharply lower by making Starlink Mobile look more like a future carrier than a satellite add-on.

Australian shares held up better than the headlines might imply. The ASX 200 added around 0.4% for the week, helped by energy stocks and rate-sensitive defensives, but the Small Ordinaries fell 1.3%. Banks, miners and data-centre names lagged, making it a selective market rather than a broad local recovery.

Oil supplied the other source of tension. Brent briefly traded near US$110 a barrel during the week before retreating towards US$104 as traders reassessed Middle East supply risk. That eased some pressure on technology valuations by the close, but energy costs remain high enough to keep inflation and central-bank policy in the picture.

The AI trade has spent much of 2026 rewarding companies that provide the computing power, chips, networking equipment and cloud capacity needed to build large models. Nvidia, Broadcom, Oracle and a widening group of infrastructure suppliers have benefited from the expectation that spending by OpenAI, Microsoft, Alphabet, Meta and other technology groups will continue rising rapidly.

This week showed the market is starting to ask a harder question: who pays for all of it, and when does that spending produce a return?

Reports around OpenAI’s revenue trajectory and the scale of funding required for future data centres hit the most heavily owned parts of the AI trade. Oracle and Broadcom fell sharply, while Micron, Samsung and other chip names also came under pressure. The concern was not that AI demand had disappeared. Instead, investors became more sensitive to the gap between the enormous capital required for data centres and the revenue those projects need to generate over time.

Apple, Nvidia and Meta helped stabilise the broader technology complex later in the week, while the Nasdaq still finished higher. But the episode made the AI trade more selective. A company connected to data-centre spending may no longer rise simply because it has an AI label; investors are likely to look more closely at customer concentration, financing commitments, margins and the time needed to turn capacity into profit.

Contracts for Difference (CFDs) allow traders to take a long or short view on the US Tech 100 and selected global shares as these expectations change. That flexibility can be useful when earnings, capital-expenditure plans or financing announcements create fast moves in both directions.

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The more dramatic stock story came from a sector that has not usually sat at the centre of the AI rally.

SpaceX agreed to acquire a portfolio of low-band 800 MHz spectrum from Grain Management for about US$8 billion. 

The spectrum is valuable because low-band airwaves offer broad coverage and stronger indoor penetration — two areas that matter if Starlink Mobile aims to compete more directly with conventional mobile networks rather than merely supplement them in remote locations.

The market reaction was immediate. T-Mobile fell 13.2% on Friday, while Verizon and AT&T each lost around 10%. European operators also sold off as investors reassessed whether satellite-to-phone services could weaken the traditional advantage held by carriers with established networks and scarce spectrum. The deal still requires regulatory approval, so it does not mean Starlink will become a nationwide mobile rival overnight. It does, however, give SpaceX a clearer route into a market previously dominated by incumbent carriers.

There is no simple one-for-one read-through to Australian telecom shares. Australia has a different regulatory structure, spectrum allocation system and mobile-market concentration. But the SpaceX deal has turned satellite competition from a long-term talking point into a tradeable global telecom issue. It also shows how quickly a single corporate transaction can redraw the assumptions investors have made about a mature sector.

The Australia 200 added 0.4% for the week, but the gain came from a narrow group of large stocks rather than a broad improvement in risk appetite. A-REITs led the market, while energy shares drew support from crude prices that briefly pushed Brent close to US$110 a barrel. Technology and smaller companies moved the other way, with the Small Ordinaries falling 1.3%.

Higher oil prices supported energy producers, but they also threatened to keep inflation and borrowing costs elevated. The prospect of higher rates is a problem for property trusts, consumer shares and highly valued growth companies; it can also weaken household spending and loan demand for the banks.

The week’s sector split gives the Australia 200 a clearer setup than the headline index gain suggests. A further rise in crude or a hawkish message in the RBA minutes could favour energy and keep pressure on the rest of the market. Easing oil prices and softer inflation expectations would give rate-sensitive sectors a better chance to recover.

US Tech 100: Can earnings answer the AI-spending question?

The US Tech 100 held up over the week, but its midweek sell-off showed how quickly confidence can turn when spending assumptions are challenged. The next major technology earnings reports are still ahead, but the market will use US bank results and inflation data to judge whether capital remains available for large-scale AI investment.

A lower inflation reading and stable yields could help restore confidence in high-growth shares. Any sign that borrowing costs will remain higher for longer, or that large technology customers are slowing infrastructure commitments, may keep pressure on the most expensive AI names.

Brent crude: Is the retreat from US$110 durable?

Brent’s pullback towards US$104 removed some immediate pressure from global equities, but it did not remove the underlying geopolitical risk premium. Traders will continue watching tanker traffic, supply developments and any signs that Middle East disruption is either worsening or easing.

A renewed push towards the week’s highs would put inflation back at the centre of the equity story and favour energy shares. Further evidence of stable supply could unwind more of the premium and support airlines, consumer stocks and rate-sensitive technology companies.

ASX 200: Can breadth improve beyond energy and defensives?

The local index has recovered some ground, but its advance has been narrow. RBA meeting minutes will provide the next domestic rate signal, while the response to US CPI and Wall Street’s first major earnings reports will shape sentiment towards banks, miners and Australian growth stocks.

A softer inflation result and calmer oil market could broaden the local rally beyond energy and defensives. Persistent inflation pressure or weaker global earnings guidance would leave the ASX dependent on a smaller group of companies again.

This week’s moves showed why a broad market view can miss the real action. AI infrastructure stocks, conventional telecom carriers, energy producers and Australian defensives responded to very different catalysts — and in several cases, moved in opposite directions.

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