Gold miners set to dominate ASX 100 in March index rebalance
Gold miners are set to reshape ASX indices with up to 17 changes forecast in the March rebalance, triggering billions in fund flows.
Source: iStock
Mentioned
KEY POINTS
- Northern Star is expected to enter the ASX 20, while four gold miners are tipped to join the ASX 100, bringing total gold representation to 11 stocks with approximately 5.5% index weight, according to Morgan Stanley.
- Up to 17 changes are expected within the ASX 300, marking one of the most active rebalances in recent periods, with the transition triggering billions in passive fund flows.
- The promotion of gold stocks will remove about 4.5 percentage points of materials sector weight from the Small Ordinaries, leading to slightly broader sector diversification among smaller companies.
The upcoming March quarterly rebalance of S&P/ASX indices is shaping up to be one of the most active in recent memory, with Morgan Stanley forecasting up to 17 changes within the ASX 300 alone.
The standout theme is the continued migration of gold stocks up the index hierarchy, a trend that will reshape sector weightings across Australian equity benchmarks and force passive funds to adjust their holdings.
Northern Star eyes top 20 entry
At the top end, Northern Star Resources is tipped to break into the ASX 20, potentially replacing Santos.
In the ASX 50, Pilbara Minerals appears well positioned for inclusion, with Seek the most likely candidate for removal.
The most pronounced changes are expected in the ASX 100, where four gold miners are forecast to join the index. Westgold Resources, Regis Resources, Vault Minerals and Genesis Minerals are all candidates for inclusion, which would push the total number of gold stocks in the ASX 100 to 11, representing approximately 5.5% of the index weight.
To make room, Pinnacle Investment Management, Lendlease, and Netwealth Group are among the stocks most at risk of demotion.
This reshuffling has important implications for investors. Passive funds tracking the ASX 100 will need to buy these gold stocks, potentially pushing prices higher. Conversely, stocks being demoted may face selling pressure as index funds unwind positions.
Calmer waters for ASX 200
After an unusually turbulent period that saw 15 changes across the past two quarterly reviews, the ASX 200 appears set for a quieter rebalance.
Morgan Stanley expects just two high-conviction changes, with SRG Global and Vulcan Energy tipped to enter, replacing Dalrymple Bay and Karoon Energy.
Small caps to see broader diversification
Within the ASX 300 and Small Ordinaries, up to 17 changes are anticipated, led by potential new entrants including:
4DMedical
Elevate Uranium
Arafura Resources
DPM Metals
Gemlife Communities Group
The promotion of gold stocks into the ASX 100 will remove about 4.5 percentage points of materials sector weight from the Small Ordinaries index, leading to slightly broader sector diversification among smaller companies.
Why this matters
Index rebalances trigger billions of dollars in forced buying and selling by passive funds that must track benchmark weightings. Stocks entering an index often see short-term price gains as funds accumulate positions, while those being removed may face headwinds.
The scheduled rebalance will be announced on Friday, 6 March 2026, with changes taking effect at the close of trading on Friday, 20 March 2026. It's not uncommon for stocks joining or leaving a major index to experience significant price movements on the day changes take effect, especially in the closing auction.
