Tech leads the selloff: what Monday's ASX moves mean for your lens

Monday brought a broad pullback across the ASX. Technology stocks took the sharpest hit, materials followed, and almost every sector finished in the red. It's the kind of day that feels dramatic in the moment and often looks smaller in hindsight.

What moved today

Information Technology led the losses, falling 3.98%. Materials dropped 2.84%, with Communication Services, Real Estate and Consumer Discretionary all giving ground. Among individual names, Liontown Resources fell 7.42% and Deep Yellow dropped 5.96%, continuing a rough stretch for the lithium and uranium end of the materials sector. BHP slid 2.94%, reflecting broader pressure on large miners. On the other side of the ledger, Karoon Energy rose 10.84%, a reminder that individual stocks can move independently of the sector tide. Northern Star fell 3.91%, pulled down alongside gold miners despite gold itself remaining elevated in global terms.

No single macro event appears to explain the full picture today. Sector-wide moves like this often reflect a combination of currency shifts, commodity price adjustments and global sentiment rather than anything specific to Australian business conditions. That context matters when interpreting the numbers.

A lesson worth keeping

There is a real cost to checking your portfolio every day, and it is not just the time. Frequent price-checking tends to make ordinary volatility feel like a crisis. A 4% sector fall looks alarming on a Monday. Seen inside a five-year chart, it often looks like a small notch. The investor who checks weekly or monthly tends to make fewer reactive decisions, and fewer reactive decisions usually means fewer mistakes.

This is not about ignoring your investments. It is about building a rhythm that matches the actual time horizon of your goals. If you are investing for ten years, daily prices are mostly noise. Using a risk-lens tool to set thresholds and review periodically is one way to stay informed without staying anxious.

A question worth sitting with

Two investors both say they own ETFs. Both feel they are well spread. But one owns a broad global fund that holds thousands of companies across dozens of countries and industries. The other owns a technology-focused fund with heavy concentration in a handful of US mega-caps. Both are ETFs. The label tells you almost nothing about the actual risk underneath. The same thing can happen closer to home, where two Australian ETFs can have very different exposures to resources, financials or interest-rate-sensitive assets. So here is the question: if someone showed you their ETF holdings today, what would you actually need to look inside them to understand what risk they are really carrying?

Days like today are worth noting but not worth losing sleep over. The PortLens view is always the same: understand what you own, know why you own it, and check in on a schedule that suits your goals rather than the market's mood. See you tomorrow.