Strong valuations, stretched AI expectations and rising market concentration are raising concerns that the current equity rally may be approaching a more fragile stage.
The market's powerful rally is showing several characteristics that have historically appeared near major market peaks. While we expect the index to continue rising and potentially push higher this year, we believe the market is increasingly resembling a late-stage move that could face a sharper correction next year.
One of the clearest concerns is valuation. The ASX 200's cyclically adjusted price-to-earnings ratio has moved close to levels seen during previous booms. The valuation gap between equities and government bonds is also unusually stretched, suggesting investors are paying a significant premium for exposure to shares.
AI optimism adds to the pressure
Artificial intelligence has become one of the biggest drivers of the current market advance, and expectations surrounding AI-related earnings have become exceptionally high. We acknowledge that AI could improve productivity and support stronger corporate earnings, but the gains being priced into some companies may be too optimistic.
The concern becomes more significant because of the heavy influence of major technology companies on the broader index. The largest companies now account for an unusually large share of the index, meaning disappointing results from a handful of AI-related firms could have an outsized impact on the overall market.
Rising debt and weaker cash flow raise another warning
We are also watching the financial demands of the AI investment boom. The major technology companies driving the expansion are committing enormous amounts of capital to data centres and other infrastructure, while their combined free cash flow is expected to turn negative in 2027.
At the same time, corporate debt issuance has climbed to record levels. This combination of heavy investment, rising borrowing and increasingly demanding earnings expectations could create additional pressure if the expected returns from AI spending take longer to materialise.
Market concentration and investor behaviour add to bubble risks
We also highlight increasing volatility in AI-sensitive markets, record levels of market concentration and a rise in equity issuance. More major IPOs and share sales could increase the supply of stocks available to investors, potentially creating additional pressure on valuations.
Taken together, we identify eight warning signs, ranging from elevated valuations and AI expectations to corporate borrowing, market concentration, equity issuance, foreign ownership and leverage. Our view is not that the market must immediately reverse, but that the combination of these factors suggests the current rally may be much closer to its later stages than its beginning.