S&P Dow Jones Indices announced on September 4, 2026 the September quarterly rebalance of the S&P/ASX Indices, effective prior to market open on September 21, 2026. As part of these changes, Alurion Resources Limited has been removed from the All Ordinaries Index, a significant shift in the company’s indexing status that can carry material implications for both the company and its investors. The All Ordinaries serves as the broadest measure of the Australian market, and removal from this benchmark represents a step down in the company’s relative standing within the equity ecosystem.
Index inclusion changes are more than administrative housekeeping. When a company is added to or removed from a major benchmark, the move often triggers substantial trading flows, particularly from passive funds and index-tracking investment vehicles that automatically rebalance their holdings to maintain alignment with the underlying indices. Removal from an index can result in forced selling pressure, as funds that track the benchmark must divest their positions in accordance with their mandate. The liquidity effects typically concentrate around the effective date, creating meaningful price volatility around the market open on the scheduled change date as large blocks of shares move from passive portfolios.
For Alurion Resources specifically, the removal suggests a meaningful deterioration in the company’s market position or capitalization rank within the investable universe. This loss of inclusion may reduce ongoing institutional attention and trading liquidity, particularly from passive capital flows that index membership typically provides. The removal can affect accessibility for funds mandated to hold only index constituents, potentially narrowing the shareholder base. Investors holding the stock should be aware that the passive base supporting the share price may contract once the rebalance takes effect.
The September quarterly rebalance involved substantial turnover across the broader market. The S&P/ASX 50 saw two removals and two additions, including the removal of WiseTech Global Limited and Cochlear Limited. The S&P/ASX 200 reflected 11 additions and 8 removals, indicating significant turnover in the mid-cap segment. The S&P/ASX 300 experienced the most activity with 15 additions and 14 removals, reflecting ongoing repricing and reconstitution at the broader end of the market as the index operators adjust constituents to reflect changing market conditions.
Investors holding Alurion Resources should monitor the trading session on September 21, 2026 and the sessions immediately following, as this is when the removal becomes effective and market participants adjust their allocations accordingly. Changes to trading volumes and share price action around the effective date can be substantial as the indexing shift works through the market. This announcement has been classified as price-sensitive and flagged as material by the ASX.
View the full ASX announcement (PDF)
About Alurion Resources Limited (ASX: ALU)
Alurion Resources Limited is a mineral development company incorporated in 2025 and based in Sydney, Australia. The company engages in the exploration of rare earth elements and critical minerals in Brazil, with its primary asset being the Amargosa project comprising 46 mining rights covering 748 square kilometers in the Amargosa District of Bahia. The company listed on the Australian Securities Exchange under ticker ALU on 31 July 2026.
If you would like to discuss this announcement or how it might affect your portfolio, request a callback or call us on 1300 889 603.
