ASX market update September 2026: oil broke US$100 and the ECB stopped waiting
Australian shares fell 2.9% in the week to Friday 11 September 2026, closing at 8,741.2. That is the steepest weekly fall since March and the lowest close since 2 July. The cause was largely imported. Brent crude crossed US$100 a barrel and the European Central Bank raised rates for the second time since the conflict began. This ASX market update September 2026 sets out what that means with the Reserve Bank meeting on 29 September.
Global markets: an oil shock and a central bank that moved
Brent crude crossed US$100 a barrel during the week and finished at US$104.61, with West Texas Intermediate at US$100.05, as disruption through the Strait of Hormuz continued. The European Central Bank responded on Thursday, lifting its deposit rate 25 basis points to 2.50% and its main refinancing rate to 2.65%. It was the ECB’s second increase since the conflict began, and President Christine Lagarde described the decision as a no brainer, saying inflation risks are tilted to the upside while growth risks are tilted down.
| US Markets | % Change | Rest of the World | % Change |
|---|---|---|---|
| The Dow Jones | -1.6% | STOXX Europe 600 | -1.7% |
| S&P 500 | -0.8% | Hang Seng | -3.3% |
| Nasdaq | -0.7% | Nikkei 225 | -1.8% |
Equities fell for four consecutive sessions before a United States inflation print close to expectations steadied them on Friday. That rebound recovered much of the damage without erasing it. The S&P 500 closed at 7,656.98 and the Nasdaq at 26,333.04, both up around 1% on the session but lower across the week. The Dow was the heaviest faller of the three, down 1.6% to 52,573. Europe was pressured by the same energy story that forced the ECB’s hand, the STOXX 600 falling 1.7%. Hong Kong was the weakest major market, down 3.3%, and Japan’s Nikkei 225 fell 1.8% to 63,844. In commodities, copper set a record above US$14,600 a tonne on the London Metal Exchange while gold eased to around US$4,428 an ounce. The United States Federal Reserve meets next week.
The ASX: the worst week since March
The local decline arrived in stages rather than in one session. Monday was flat, Tuesday fell 1.0%, Wednesday held at 0.1% lower, then Thursday and Friday gave up a further 1.0% and 0.9% as oil pushed through US$100 and bond yields climbed. Three year Australian government bond yields spiked above 4.65%. The damage was concentrated rather than uniform: materials fell 3.3% on Friday alone while financials rose 1%, the one sector that worked.
| Best 3 movers | % Change | Worst 3 movers | % Change |
|---|---|---|---|
| INA | +8.8% | XRO | -15.5% |
| MI6 | +8.0% | DYL | -14.8% |
| KAR | +5.5% | WGX | -13.1% |
Ingenia Communities led the index after rejecting an unsolicited, conditional and non binding proposal from Warburg Pincus at $4.75 a share, valuing the company near $1.9 billion. The board said the offer substantially undervalues Ingenia and is not in the best interests of security holders, and the shares posted their biggest jump in about 17 years, rising 13.7% on Monday. At the other end, Xero fell 15.5% without any announcement of its own, alongside WiseTech down 13.3% in the same week, as the global technology complex sold off. The margin pressure from Xero’s Melio acquisition, which cut gross margin from 89% to 83.9% at the FY26 result, is a pre-existing concern rather than this week’s news, and the stock is now down roughly 37% across 2026. We could not source a reason for the gains in Minerals 260 or Karoon Energy, nor for the falls in Deep Yellow or Westgold. Where a company has not explained a move of that size, we would rather say so than offer a theory.
What this ASX market update September 2026 says about the RBA
Last week I wrote that two inflation impulses were converging, one domestic and one imported, and that they were additive rather than alternative. This week the imported one escalated and a central bank acted on it.
The ECB’s position is worth understanding, because ours is a version of it. Europe faces an oil shock it did not cause, cannot influence and cannot hedge at a national level. Raising interest rates does nothing whatsoever to increase the supply of crude. The Governing Council raised anyway, for the second time, because the alternative is allowing an energy price shock to leak into wages and expectations, at which point it stops being temporary and starts being structural. Lagarde calling it a no brainer is not the language of a central bank that believes it has options.
The Reserve Bank meets on 29 September facing the same arithmetic with a domestic demand problem attached. The cash rate stays at 4.35% until then. NAB, Deutsche Bank, UBS and Morgan Stanley now all forecast a 25 basis point rise to 4.60% at that meeting. ANZ and CBA expect the move in November. Westpac alone expects no rise at all this year. That spread across four major forecasters is itself the useful information, because it tells you how genuinely uncertain the next move is.
A 2.9% week is unpleasant and largely noise. The repricing underneath it is not. Anything that depends on cheap energy or cheap money deserves examination before the meeting rather than after it, which is why we weight our private market and income strategies toward contracted cash flows rather than forecast ones.
Book a strategy call at barkerwealth.com.au to talk through how a rising domestic rate path sits against your own positioning. You can also read last week’s market update or more about how we work with wholesale investors.
This commentary is intended for general information only and does not constitute personal financial advice. You should consider your own objectives, financial situation and needs before making any investment decisions. Barker Wealth Management Pty Ltd ABN 46 695 875 962, trading as Barker Wealth, holds Australian Financial Services Licence (AFSL) 700297. Your adviser is Joshua Barker (AR 1274752).