Taming the Australian Share market: How Equal Weights, Factors and Structure Can Help Everyday Investors

For many Australian investors, broad index funds and familiar blue‑chip shares are the backbone of their portfolios. It’s easy to see why—these options are low‑cost, simple to understand and offer quick exposure to a wide range of local companies. But the Australian sharemarket has some unique quirks. Many investors don’t realise just how much of their portfolio ends up tied to a small group of banks and mining giants. Understanding how the market is built—and what alternatives exist—can help investors make clearer, more confident decisions. In this blog, we explore insights commonly discussed by investment writers such as Jamie Wickham and Martin Conlon. We’ll unpack how the market works, what equal‑weighting means, and why factors like value and size still matter today.

Why the Australian Sharemarket Is So Concentrated

The S&P/ASX 200, the main benchmark index, is constructed using market capitalisation. In simple terms: the biggest companies get the biggest share of the index. Because Australia has a large banking sector and a powerful resources industry, the index becomes heavily concentrated in:

• Major banks
• Big miners (particularly iron ore producers)
• The broader financials and materials sectors

This means that when you buy a standard index fund, a large portion of your “diversified” Australian share exposure is actually driven by the performance of just a handful of companies. When banks and miners surge, this is helpful. But when they go through tough periods, your returns feel it too. Meanwhile, sectors like healthcare, technology, or industrials—key contributors to the real economy—play only a small role in the index. Understanding this concentration helps explain why a portfolio might sometimes feel more “bank‑and‑miner‑heavy” than expected.

Equal‑Weighting: A Different Way to Spread Your Risk

Some commentators, including Wickham, explore what happens if we give each sector a more equal footing. Instead of allowing the largest sectors to dominate, an equal‑weight or sector‑balanced approach spreads exposure more evenly across:

• Financials
• Materials
• Healthcare
• Industrials
• Consumer companies
• And more

Portfolios using this method are regularly rebalanced so that no sector becomes too large or too small.

Why would investors consider this?

• It increases diversification by making room for smaller, under‑represented parts of the economy.
• It ensures exposure to sectors that may be temporarily out of favour.
• It can naturally encourage a “buy‑low, trim‑high” discipline.

Conlon often points out that sectors like healthcare and other “real‑economy” businesses have faced weaker sentiment in recent years. Equal‑weighting ensures these areas aren’t ignored—so if they rebound, the portfolio benefits without needing bold predictions or sudden shifts. Of course, equal‑weighting isn’t always superior. Sometimes it outperforms; sometimes it lags. It’s simply another structure to consider.

Factor Investing: Value and Size Still Matter

Another long‑running theme in portfolio design is factor investing—simple characteristics that have historically influenced returns. Two of the most prominent factors are:

1. Value

Refers to companies that are “cheap” based on fundamentals like earnings or cashflow.
Over long stretches, value stocks have often produced stronger returns than expensive ones because:

• expectations are lower
• there’s more room for positive surprise

2. Size

Historically, smaller companies have sometimes grown faster than larger established businesses.
However, they can also be more volatile. Australian researchers have studied how these patterns appear locally and how they can be captured through diversified, rules‑based funds.

Importantly:
Value and size aren’t “better” than broad index exposure—they’re simply different choices with different risk/return profiles.

Why Structure (and Regular Rebalancing) Matters Most

A consistent message across the work of Wickham and Conlon is the importance of structure and discipline. Markets are full of stories—AI breakthroughs, commodity booms, housing cycles, new technologies. Headlines can be exciting, but reacting emotionally can derail long‑term plans.

A structured approach involves:

• Knowing how much to hold in various assets and sectors
• Sticking to those settings
• Rebalancing on a schedule
• Avoiding impulsive bets based on news cycles

Rebalancing helps maintain diversification by trimming what’s grown and adding to what’s cheapened—without trying to guess where markets are headed next.

What This Means for Everyday Investor

These ideas are not instructions—they’re tools to help inform your understanding.

Key takeaways:

• The Australian sharemarket is unusually concentrated in banks and miners.
• Equal‑weighting and sector balancing can diversify beyond dominant sectors.
• Factor investing (like value and size) offers additional ways to structure portfolios.
• A clear plan with regular rebalancing often matters more than choosing the “perfect” product.

The right mix depends on your personal goals, financial situation and risk tolerance. Anyone considering changes should think carefully about their position and seek personal advice if needed. Ultimately, knowing how the market is structured—rather than reacting to its noise—can help investors ask better questions and make more confident decisions.