Big Changes in ASX 50: Pro Medicus and Sigma Healthcare Join, Mineral Resources and Ramsay Exit

3 min read | March 09, 2025 07:20 PM PDT | By Team Kalkine Media

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Big Changes in ASX 50: Pro Medicus and Sigma Healthcare Join, Mineral Resources and Ramsay Exit — Image source: shutterstock

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Highlights

Pro Medicus (ASX:PME) and Sigma Healthcare (ASX:SIG) set to join ASX 50.

Mineral Resources (ASX:MIN) and Ramsay Health Care (ASX:RHC) to exit the index.

Changes to ASX 100 and ASX 200 indices announced, effective March 24.

The latest quarterly review by S&P Dow Jones Indices has brought significant changes to the Australian stock market, with healthcare companies Pro Medicus (ASX:PME) and Sigma Healthcare (ASX:SIG) making their way into the ASX 50. At the same time, Mineral Resources (ASX:MIN) and Ramsay Health Care (ASX:RHC) will be removed from the index. These adjustments, aimed at ensuring the indices accurately represent Australia’s largest companies based on market capitalisation, will take effect before the opening of trading on March 24.

Following the announcement, the share prices of the affected companies reacted. By 11:45 AM AEDT, Pro Medicus (ASX:PME) and Sigma Healthcare (ASX:SIG) recorded slight declines of 0.2% and 0.5%, respectively. On the other hand, Mineral Resources (ASX:MIN) and Ramsay Health Care (ASX:RHC) saw gains of 2.9% and 1.2%, reflecting market reactions to their removal from the ASX 50.

Beyond the ASX 50, the review also introduced changes to the ASX 100 and ASX 200 indices. Life360 (ASX:360), a well-known developer of family tracking technology, has been included in the ASX 100, while Iluka Resources (ASX:ILU) and NIB Holdings (ASX:NHF) will be exiting. Meanwhile, multiple companies are set to join the ASX 200, including Capstone Copper (ASX:CSC), DigiCo Infrastructure REIT (ASX:DCI), Imdex (ASX:IMD), Macquarie Technology Group (ASX:MAQ), Nuix (ASX:NXL), Spartan Resources (ASX:SPR), and Temple & Webster (ASX:TPW). At the same time, some companies will no longer be part of the ASX 200, such as Audinate (ASX:AD8), Collins Foods (ASX:CKF), Charter Hall Social Infrastructure REIT (ASX:CQE), Coronado Global Resources (ASX:CRN), Johns Lyng (ASX:JLG), Kelsian Group (ASX:KLS), and Star Entertainment (ASX:SGR), which remains suspended.

These quarterly reviews are an essential part of the market's structure, ensuring that indices accurately reflect the most significant players based on market movements. The evaluations conducted by S&P Dow Jones Indices assess whether companies still meet the criteria to remain in their respective indices or if adjustments are required to maintain accurate market representation. Investors and analysts closely monitor these changes, as they can influence stock performance based on inclusion or removal from key indices. With the upcoming adjustments set to take effect on March 24, these shifts will play a crucial role in shaping the composition of the ASX benchmarks for the next quarter.

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