04/06/2026
Thematic ETFs are booming - but the most exciting funds are often the thinnest, and that's exactly where careless buyers lose 10% the moment they hit "Buy." A plain-English look at spreads, last-price illusions, and how to trade them properly.
A short lesson in not handing strangers your money at the open.
Open your trading app one morning and you might see something that looks like good news: an ETF you own - or were thinking of buying - is suddenly "up 9%." A big green number. Before you celebrate, or worse, rush to buy, it's worth understanding what you're actually looking at. Because nine times out of ten, that ETF hasn't moved at all. What you're seeing is a quirk of how prices are displayed, and behind it sits someone who just overpaid badly.
Thematic ETFs are booming - but the most exciting funds are often the thinnest, and that's exactly where careless buyers lose 10% the moment they hit buy. A plain-English look at spreads, last-price illusions, and how to trade them properly.