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The Markets Brief – May 18, 2026

May 18, 2026

The Markets Brief

ASX Pre-Market · 7:30am AEST

Opening Note

Wall Street closed Friday with broad losses — the S&P 500 fell 1.24% to 7,408.5, the Nasdaq dropped 1.54% to 26,225.1, and the Dow shed 1.07% to 49,526.2 — as rising US 10-year yields (up 3.00% to 4.59%) and escalating Iran war concerns drove a risk-off session. Australian investors returning from the weekend face a negative open, with the AUD/USD off 0.98% to 0.7154 adding currency headwind across the ASX.

Iran war uncertainty is the dominant macro theme, with WTI crude sustaining above $100 at $101.02 and analysts flagging a potential $300 billion economic shock from the conflict. Domestically, proposed CGT changes from Treasurer Chalmers drew a public backlash from technology founders over the weekend — a live policy risk for ASX-listed software names that outperformed Friday, including Xero (+8.13% to $79.67) and WiseTech Global (+3.65% to $38.01).

BHP ($60.46) and Rio Tinto ($185.75) face fresh selling after copper slid 2.12% to $6.30, while Pilbara Minerals ($6.01) and Mineral Resources ($64.77) — which fell 5.80% and 7.68% respectively on Friday — remain exposed to the commodity downturn; Santos ($7.88) and Ampol ($35.05) may hold relative support with oil above $100.


Markets at a Glance

Indices

ASX 200 8,630.8 ▼ -0.11%
S&P 500 7,408.5 ▼ -1.24%
Dow Jones 49,526.2 ▼ -1.07%
Nasdaq 26,225.1 ▼ -1.54%

FX

AUD/USD 0.7154 ▼ -0.98%
AUD/GBP 0.5362 ▼ -0.43%
AUD/EUR 0.6153 ▼ -0.55%
AUD/JPY 113.3680 ▼ -0.87%

Rates

US 10Y 4.59% ▲ +3.00%

Commodities

Gold $4,561.90 ▼ -1.25%
WTI Oil $101.02 ▼ -1.32%
Copper $6.30 ▼ -2.12%

Crypto

Bitcoin $78,217 ▲ +0.14%

ASX Market Movers · Previous Session

▲ Top Gainers

XRO

Xero

$79.67 ▲ +8.13%

WTC

WiseTech

$38.01 ▲ +3.65%

RHC

Ramsay Health

$37.56 ▲ +3.47%

CPU

Computershare

$31.07 ▲ +3.43%

WHC

Whitehaven Coal

$7.97 ▲ +3.24%

TNE

Technology One

$28.36 ▲ +3.09%

ALD

Ampol

$35.05 ▲ +2.88%

STO

Santos

$7.88 ▲ +2.74%

▼ Top Losers

MIN

Mineral Resources

$64.77 ▼ -7.68%

PLS

Pilbara Minerals

$6.01 ▼ -5.80%

S32

South32

$4.21 ▼ -5.18%

NEM

Newmont

$157.44 ▼ -4.11%

RIO

Rio Tinto

$185.75 ▼ -3.24%

AGL

AGL Energy

$9.09 ▼ -2.88%

IGO

IGO

$8.51 ▼ -2.85%

BHP

BHP

$60.46 ▼ -2.58%

ASX Focus

Overview

ASX miners bore the brunt of Friday's selling — Mineral Resources fell 7.68% to $64.77, Pilbara Minerals 5.80% to $6.01, and BHP 2.58% to $60.46 — driven by copper's 2.12% decline and Iran war-driven risk aversion; the commodity rout extends into Monday's open.

Australian Financial Review

Chalmers' CGT Changes Threaten Startup Investment, Critics Say

Proposed capital gains tax changes by Treasurer Jim Chalmers have drawn sharp criticism from technology sector leaders, who argue the reforms will undermine venture capital investment and startup formation. The policy uncertainty is a direct risk for ASX-listed technology companies including Xero (+8.13% Friday to $79.67) and WiseTech Global (+3.65% to $38.01), whose Friday gains could face reversal if sentiment deteriorates.

Australian Financial Review

Fortescue Faces Scrutiny Over Cultural Heritage Compliance

A former Rio Tinto executive says Fortescue received insufficient regulatory consequences for cultural heritage destruction, reigniting ESG and governance scrutiny across the Australian mining sector. The comments land as ASX miners are already under pressure from falling commodity prices — copper at $6.30 (-2.12%) and lithium names including Pilbara Minerals (-5.80% Friday to $6.01).

Australian Financial Review

Bracket Creep to Persist Under Labor or Coalition, Analysis Shows

Analysis shows Australian workers face ongoing bracket creep regardless of which party governs, steadily eroding real disposable income over time. For ASX-listed consumer and retail companies, persistent bracket creep constrains household spending capacity — a structural headwind for discretionary retailers already navigating elevated inflation.


Macro & Policy

Overview

The Iran war is the dominant global macro development, with analysts estimating a potential $300 billion economic shock that threatens to sustain oil above $100, push mortgage rates higher, and complicate the RBA's inflation outlook as Australian investors return to markets Monday.

MarketWatch

Iran War Could Deliver $300 Billion Economic Shock

Analysts estimate the Iran conflict could generate a $300 billion economic shock, driving mortgage rates higher and squeezing wages through sustained energy price inflation with WTI crude at $101.02. For Australia, higher global oil prices and tighter US financial conditions — the 10-year yield at 4.59% — reinforce pressure on the RBA to hold rates and add cost-of-living stress for Australian mortgage holders.

The Guardian

Tech Founders Publicly Protest Albanese Government's Tax Changes

Australian technology founders mounted a public campaign over the weekend against proposed tax changes they argue will deter venture capital and startup growth. The backlash adds domestic policy uncertainty for ASX-listed technology companies at a time when global macro conditions — rising yields and Iran war risk — are already unfavourable for growth stocks.

The Guardian

Coles and Woolworths Found to Synchronise Promotions, Data Reveals

New data shows Coles and Woolworths routinely align promotional activity across product categories including food, personal care, and frozen goods — a pattern likely to attract renewed ACCC scrutiny. For ASX investors, regulatory risk is a live overhang for both COL and WOW at a time when household cost-of-living remains a political flashpoint.


Commodities

Overview

Oil is the lead commodity — WTI crude held above $100 at $101.02 (-1.32%) as the Iran conflict sustains energy price pressure — while copper's 2.12% slide to $6.30 directly threatens earnings across ASX mining heavyweights including BHP, Rio Tinto, and South32.

News Ghana / Google News

OPEC Holds Demand Forecast as Oil Markets Tighten

OPEC has maintained its global oil demand forecast even as supply conditions tighten, underpinning elevated crude prices with WTI at $101.02. For ASX investors, sustained oil prices support Santos (+2.74% Friday to $7.88) and Whitehaven Coal (+3.24% to $7.97), while adding to inflation risk for the broader Australian economy.

MarketWatch

Iran War Sustains Oil Above $100 as Energy Markets Reprice

The Iran conflict has become the primary driver of energy market pricing, keeping WTI crude at $101.02 and embedding upside risk into oil for as long as hostilities continue. For Australian investors, elevated oil prices support ASX energy names but also raise input costs for transport, logistics, and manufacturing companies across the index.


Global Markets

Overview

Friday's US session delivered a broad risk-off selloff — the S&P 500 lost 1.24% to 7,408.5, the Nasdaq fell 1.54% to 26,225.1, and the Dow dropped 1.07% to 49,526.2 — as the US 10-year yield climbed to 4.59% and Iran war fears weighed on equities globally.

MarketWatch

Rising US Yields Drive Wall Street Selloff; S&P 500 Falls 1.24%

The US 10-year Treasury yield rose 3.00% to 4.59% on Friday, compressing equity valuations and driving the S&P 500 down 1.24% to 7,408.5 in a broad risk-off session. Higher US yields typically weigh on AUD/USD — now at 0.7154 (-0.98%) — and pressure ASX growth and rate-sensitive stocks including REITs and technology names.

MarketWatch

Nvidia Props Up S&P 500 Earnings Growth Amid Concentrated Market

Nvidia remains the primary driver of S&P 500 aggregate earnings growth, with analysts noting the index's headline result depends heavily on a handful of AI-exposed mega-cap names. For Australian investors with US equity exposure, this concentration means any Nvidia earnings disappointment could disproportionately reprice the broader market — a risk to monitor as earnings season continues.


The Number

4.59%

The US 10-year Treasury yield, which rose 3.00% on Friday to reach 4.59% — the primary catalyst behind Wall Street's broad selloff and a direct pressure point for ASX rate-sensitive sectors including REITs, growth stocks, and banks as Australian investors return Monday.

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