ASX:ALQ 18 May 2026 - 21 June 2026

ALS Ltd is set to join the S&P/ASX 50 before the Australian market opens on Monday, after a sharp fall in the stock on Friday. More index-tracking funds will now pick up the laboratory-testing firm. S&P announced the change on June 5, dropping Pro Medicus, the medical-imaging software group, from the index. Cash trading hadn’t started when this was published. ASX’s normal session begins about 10 a.m. Sydney. ALS’s promotion is on investors’ radar because index-tracking funds might have to rebalance. Traders have had over two weeks to get ready, so some of the buying may already have played out. Where ALS opens Monday could show more about market positioning and liquidity than about the company itself.

ALS Ltd fell 3.25% to A$22.60 on Friday, ahead of its move into the S&P/ASX 50 index. With the market closed over the weekend, trading under the new index mix starts Monday. ALQ dropped hard on Friday but still closed the week up 0.27% from last Friday. The S&P/ASX 200 edged 0.28% higher for the week, even after Friday’s pullback.

ALS Ltd shares lost 2.02% to finish at A$22.28 on Thursday, adding to a 3.44% decline the day before. The lab testing company started the week at A$23.55. ALS shares moved between A$22.04 and A$22.71 through the session. Trading volume came in around 2.60 million shares, Investing.com data showed. ALS underperformed the wider Australian market. The S&P/ASX 200 finished June 11 down 0.23% at 8,633.20, moving between 8,555.30 and 8,670.20 in the session. ALS’s fall was steeper than the index’s drop.