Hikes, Holds, and Hormuz: What Moved Markets This Week | Week Ending 19 September 2026

The Week at a Glance

Three of the world’s most-watched central banks met this week. Two raised rates. The third held, by the narrowest margin, while telling markets not to get comfortable. That is not a coincidence of scheduling. It is the same inflation problem, the same energy shock, showing up in Washington, Tokyo and London in the same seven days.

The Federal Reserve delivered its first hike since 2023. The Bank of Japan pushed borrowing costs to a 31-year high. The Bank of England held, but only just.

Underneath that, the headline tape barely moved. The S&P 500 closed effectively flat. The Nasdaq edged higher. The Dow fell 1.7 per cent, dragged by rate-sensitive names, and the Russell 2000 dropped about 1.5 per cent. The oil shock that has driven half of this year’s macro story finally cracked — not because the war around the Strait of Hormuz eased, but because Saudi Arabia found a way around a damaged pipeline. That distinction, between a war ending and a war being logistically absorbed, is the most useful thing the week produced.

In Australia, the RBA’s own hawkish turn kept the ASX 200 pinned to a third straight weekly loss, even as a Friday bounce in miners took some of the sting out. Only three of eleven sectors finished higher.

1. Saudi Arabia Routes Around the War

The proximate cause of this week’s oil volatility was not the Iran war itself. That conflict, now in its seventh month, has been in the crude price for months. It was a drone attack on 10–11 September, which Saudi officials traced to Iran-aligned militias operating out of Iraq, that damaged pumping stations on Saudi Arabia’s East–West pipeline and forced a shutdown of the kingdom’s main alternative export route around Hormuz.

The market’s first reaction was to treat the outage as additive to an already-tight supply picture. WTI ran from the low-$90s earlier this month to an intraweek futures high of US$106.75 on Tuesday. Spot WTI printed US$107.02 on 15 September. Brent pushed toward US$109 in the same stretch. Then the picture changed.

Saudi Arabia began offering additional crude to Asian refiners through ship-to-ship transfers off Oman’s port of Sohar, and shifted more barrels through Hormuz itself on shuttle vessels under US naval escort. US Energy Secretary Chris Wright said a single-day peak through the strait had reached almost 18 million barrels, and that the seven-day escorted average was still rising. Riyadh also signalled the pipeline could be partly restored within days and fully repaired in roughly six to eight weeks — faster than some independent estimates from immediately after the strike.

By Friday’s settlement, WTI closed at US$100.30, essentially flat on the week despite the mid-week spike. Brent settled at US$103.87, down close to 1 per cent.

That is not a peace dividend. The International Energy Agency’s latest read still has Hormuz flows at only 7.6 million barrels a day in August, 13.1 million below pre-war levels. Bypass routes from Yanbu and Fujairah have offset about 2.8 million barrels a day of those lost Hormuz volumes since the conflict began, and JPMorgan’s commodities desk still puts total disrupted Middle East supply around 10 million barrels a day. The war has not stopped costing the market barrels. What the market learned this week is narrower, and more useful: Saudi Arabia has more spare logistical capacity to route around a single damaged chokepoint than traders had priced in, and that capacity is now a ceiling on how far one infrastructure hit can push the price.

The diplomatic backdrop did not help. A planned meeting in Oman between Iran and Gulf Arab states — aimed at a temporary shipping lane through Hormuz — was postponed at Saudi Arabia’s request on 13 September, reportedly over continued attacks on Saudi territory. Nothing about the underlying war moved. What moved was the market’s read on how much damage a single infrastructure hit can actually do, and that read got smaller.

2. Three Central Banks, One Direction

The Fed. On Wednesday the FOMC voted 12–0 to raise the federal funds rate a quarter point to 3.75%–4.00% — the first US hike since 2023, and the first meeting under Chair Kevin Warsh to actually move the dial. The decision had been close to fully priced since last week’s hot core CPI print pushed the market from roughly 50/50 to around 90 per cent odds of a hike. Warsh said the Fed cannot single-handedly offset a price shock originating in the oil market, but that it does have a role in stopping that shock from broadening into wider inflation expectations. The updated dot plot showed 16 of the 18 officials who submitted projections expecting at least one more hike before year-end, with four pencilling in two. The 2027 path is far less settled. The median dots imply no further rise next year, but a sizeable minority still pencil in another tightening step. The committee does not have a house view on how long this leg runs.

The equity reaction was muted precisely because so little of it was news. Stocks firmed modestly through Wednesday’s press conference and into Friday. The real move was in bonds: the 10-year Treasury yield printed 5.00% on Monday and 5.01% on Wednesday — a level last tested in October 2023, and before that in 2007 — before easing back to close the week near 4.99%.

The Bank of Japan. Friday brought the BoJ’s own hike — a quarter point to 1.25%, the highest Japanese policy rate since 1995, and the shortest interval in the current cycle. The vote split 7–2, with Toichiro Asada and Ayano Sato dissenting. Perversely, the yen weakened on the news rather than strengthening. The split vote read as evidence that further tightening is not guaranteed, which mattered more to currency traders than the hike itself.

The Bank of England. Thursday’s MPC vote came down 6–3 to hold Bank Rate at 3.75%, with three members pushing for an immediate move to 4%. UK CPI accelerated to 3.1% in August on the same Middle East-driven energy costs weighing on every economy in this story. Governor Andrew Bailey and his deputies all raised the prospect of tightening if the conflict persists. Markets were told, in effect, to treat a hike at the November or December meeting as the base case rather than a tail risk.

Three meetings, three different votes, one underlying diagnosis: an energy-driven inflation shock that monetary policy cannot solve at the source, but that every major central bank now feels obliged to lean against anyway. That is a meaningfully different environment from the demand-side inflation this cycle’s earlier playbook was built for.

3. Down Under: The RBA Warms Up for Its Own Decision

The ASX 200 closed the week at 8,731.20, down a fraction of a per cent — its third straight weekly decline, and a long way from early August’s record high above 9,290. The index spent Friday giving back an early rally as Reserve Bank Governor Michele Bullock told a parliamentary committee in Canberra that upside inflation risks are “starting to materialise,” language markets read as confirmation that a rate rise is coming rather than merely possible.

That reading is now close to consensus. Markets are pricing better than a four-in-five chance — and in some quotes closer to 90 per cent — that the RBA lifts the cash rate a quarter point, to 4.60%, when the board meets on 28–29 September and announces on the 29th. That would follow three hikes already delivered this year and would put the RBA in the same camp as the Fed and the BoJ: a central bank responding to an energy-driven inflation shock rather than a demand boom. AMP deputy chief economist Diana Mousina summed up the domestic mood bluntly: Australian shares have had no net growth since the start of the year, a function of a Reserve Bank leaning more aggressively than the Fed against an economy that is simultaneously slowing.

The sector split told the real story. Diversified miners rallied hard on Friday — BHP up 1.4% to $61.05, Rio Tinto up 0.8% to $167.49 — as copper and precious metals bounced from their recent sell-off. Gold producers outperformed broadly. Banks and the rest of the index lagged. The Australian dollar firmed intraday on the hawkish RBA commentary to around 71.3 US cents, and closed near 0.7125, still softer than the 0.7170 it traded at a week earlier. A hawkish RBA and a hawkish Fed can both be true at once. When both are leaning the same way, the currency has to net the two out rather than simply following whichever one made headlines that day. We unpack exactly this mechanism in Wednesday’s Currency Watch piece.

Local bond yields eased modestly through the week — the three-year down to around 4.93%, the ten-year to around 5.27% — even as the RBA’s rhetoric hardened, a sign that Friday’s testimony was largely already in the price heading into 29 September.

The Scorecard

US weekly performance is Friday 11 September close to Friday 18 September close. ASX week is the same window, Sydney time.

Also under the surface

Index calm hid a few stock-specific moves worth filing away.

Sandisk climbed on continued AI-datacentre storage demand ahead of its inclusion in the S&P 100 on 21 September, where it joins Dell, Palo Alto Networks and Arista Networks. Coinbase and Robinhood both jumped after the SEC on 17 September issued a five-year conditional Innovation Exemption letting eligible tokenised-securities venues trade tokenised versions of US-listed NMS stocks without full exchange registration — a genuine regulatory first. And Berkshire Hathaway confirmed Warren Buffett is stepping down as chairman to become chairman emeritus, remaining on the board as an adviser, with his son Howard Buffett taking the chair. Given how many Australian portfolios carry Berkshire exposure indirectly through US index funds, that is a governance change worth noting even though it did not move the index this week.

The Read

The headline this week is “three central banks, one direction,” and that headline is real. The more useful read is what happened to the oil shock underneath it.

A war that has been running since February did not get any closer to ending. The Oman talks were postponed, the naval blockade continues, Hormuz is still running millions of barrels a day below pre-war levels, and JPMorgan still cannot model an endgame. What changed was Saudi Arabia’s demonstrated ability to route enough crude around a single damaged chokepoint to cap the price spike within days rather than weeks. That is a supply-side story, not a peace story, and the two get conflated in headlines far too easily.

For a portfolio split across US and Australian holdings, the distinction matters for one reason. If the market has learned that infrastructure disruptions in this war get absorbed faster than feared, then the next attack — and there will be a next one; this conflict is not close to resolved — is less likely to produce the kind of sustained price spike that would force central banks into a faster hiking pace than the one already on the table. The bond market’s reaction supports that read: the 10-year backed off its 5% test rather than pushing through it, even with three central banks confirming or flagging further tightening in the same week.

None of that changes the arithmetic facing the RBA on 29 September, or the Fed’s own year-end decision. Both are now genuinely live, both are being driven by the same energy-cost pass-through, and both will move the AUD/USD cross in ways that matter more to an Australian portfolio’s US-dollar return than most single-stock decisions will this quarter.

Next Week

If Saudi Arabia’s rerouting holds and the pipeline repair timeline stays on track, oil’s role as the dominant macro driver may start to fade. If either assumption breaks, expect this same three-part structure — a Middle East headline, a central-bank response, an AUD/USD consequence — to repeat itself again.

Data Sources:

• Federal Reserve, FOMC statement, SEP and Warsh press conference, 16 September 2026; Fed H.15 (10-year yield)
• Bank of Japan, Monetary Policy Statement, 18 September 2026
• Bank of England, Monetary Policy Summary and Minutes, 17 September 2026
• Reserve Bank of Australia, Governor Bullock parliamentary testimony, 18 September 2026
• IEA oil-market commentary, 18 September 2026; EIA/FRED WTI spot; Dow Jones crude settlements, 18 September 2026
• Reuters, Bloomberg, WSJ and NYT, East–West pipeline and Hormuz flows, 12–18 September 2026; Chris Wright via Reuters, 14–17 September 2026; JPMorgan commodities note via Reuters, 17–18 September 2026
• Dow Jones / Barron’s, US index closes, 18 September 2026; Market Index, ASX 200 and miner closes, 18 September 2026
• SEC Innovation Exemption, 17 September 2026; S&P Dow Jones Indices, S&P 100 changes effective 21 September 2026; Berkshire Hathaway shareholder letter, 18 September 2026
• AMP Capital via Morningstar Australia, 18 September 2026

Wall St. Down Under | Australia

Subscribe | wallstdownunder.com.au

Disclaimer: Wall St. Down Under is an independent financial newsletter for informational and educational purposes only. Nothing published here constitutes financial advice, a recommendation to buy or sell any security, or a solicitation of any investment decision. Always do your own research and consult a licensed financial adviser before making investment decisions. Australian investors should consider their own financial situation, objectives, and risk tolerance. Past performance is not indicative of future results.