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With 30 per cent of the U.S. S&P 500 index trading at more than 10 times sales, and 13 per cent of the S&P 500 by index weight trading at 20 times price-to-sales (P/S) (a level that now surpasses the tech boom of 1999-2000), we’ll take a break this week from commenting further on market valuations and leave it to you to decide whether it’s wise to be fully invested in equities, or diversified.

This article was first published in The Australian on 21 November 2025.

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by Roger Montgomery Posted in In the Press, Technology & Telecommunications.

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I joined Sean Aylmer for Fear and Greed’s Summer Series to talk about high-frequency arbitrage, how these strategies work, and why they have become an increasingly attractive alternative for sophisticated investors. We discussed how arbitrage seeks to profit from volatility and pricing inefficiencies across global asset exchanges. Importantly, we also explored how this type of strategy can complement a diversified portfolio by providing returns that are largely uncorrelated to equity markets.

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by Roger Montgomery Posted in Digital Asset Funds Management, Insightful Insights, Investing Education, Podcast Channel.

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Sir Isaac Newton is enshrined in history as the saint of rational thought. He decoded the laws of gravity, invented calculus, and parsed the rainbow. Yet, in the spring and summer of 1720, the arguably most intelligent man in the British Empire made a series of financial blunders, recorded for posterity, and so catastrophic they have become a cautionary legend in economic and investment history.

Newton’s entanglement with the South Sea Company serves as a stark reminder: in the face of collective delusion and market mania, even a genius can be led astray. Continue…

by Roger Montgomery Posted in Investing Education, Market commentary, Technology & Telecommunications.

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Yesterday I joined Jess Maguire on ABC’s Statewide Drive to discuss the sharp fall in Meta’s share price after it revealed another huge increase in artificial intelligence (AI) spending. I explained that while Mark Zuckerberg insists the investment will eventually pay off, the scale of AI infrastructure costs – potentially US$3–5 trillion by 2030 – means companies will need extraordinary revenues to justify the outlay. History shows transformative technologies often enrich consumers more than investors, and while today’s firms are profitable – unlike in 1999 – the “build-now, profit-later” mentality risks colliding with commercial reality.

Catch the full episode from 1:43:29 ABC Statewide Drive here.
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by Roger Montgomery Posted in Radio.

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October 2025 will go down as an extraordinary month for investors. NVIDIA, which has appreciated by over 50 per cent in the first ten months of 2025 and seen its market capitalization exceed US$5 trillion. The aggregate market capitalization of the Magnificent Seven (including Alphabet, Amazon, Apple, Meta, Microsoft and Tesla) hit US$22 trillion, or 37.4 per cent of the S&P 500 and the excitement surrounding artificial intelligence (AI) is palpable. Continue…

by David Buckland Posted in Market commentary.

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On Monday the S&P/ASX 200 tumbled two per cent, led by a sell-off in tech stocks. It’s now down about seven per cent over the past month. Concerns about the end of the interest rate cycle in Australia, a lack of information on Wall Street and the forever present geopolitical fears seem to be weighing on investors.

On Fear & Greed, with Sean Aylmer, I explained that stretched valuations and a cooling of artificial intelligence (AI) optimism are prompting a shift in sentiment – but this isn’t a time to panic. It’s a reminder to rebalance, trim what’s run hard, and look to genuinely diversified, uncorrelated opportunities.

Tune in to the episode here: Q+A: What’s next after yesterday’s market tumble? Continue…

by Roger Montgomery Posted in Economics, Market commentary, Podcast Channel.

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Last night, on ABC’s 7.30 news report with Michael Rowland, I discussed whether surging investment in artificial intelligence (AI) is pushing large technology companies to unsustainable valuations. I noted that investors often become highly enthusiastic when new technologies emerge that are believed to reshape the world, but history shows this can inflate expectations. In the case of AI, the scale of spending by tech hyperscalers is immense, and to justify it they would need extraordinary levels of revenue.

Watch the full segment here: ABC News – Are AI investors causing tech companies to be overvalued?

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by Roger Montgomery Posted in Insightful Insights, Market commentary, On the Internet, Technology & Telecommunications, TV Appearances.

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Recently, the BBC interviewed Sundar Pichai, the CEO of Alphabet, Google’s parent. With all the claims the artificial intelligence (AI) boom is a bubble – something I have noted cannot be known until after the event – I wonder whether the BBC was motivated to go to the source. 

Describing the surge in AI funding as a remarkable period, yet one marked by certain unrealistic expectations, Pichai warned viewers of BBC News that no business would escape unscathed if the AI boom collapses. Continue…

by Roger Montgomery Posted in Global markets, Market commentary, Technology & Telecommunications.

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On this episode of Over the Money Fence, I joined Nicola and Di to reflect on what really shaped markets in 2025, cutting through the noise around artificial intelligence (AI), technology stocks, gold, Bitcoin, inflation and interest rates. I shared my outlook for 2026, including the risks of an AI-led bubble, the growing role of alternative strategies like private credit, and why diversification and quality investing remain essential. We also tackled the most common listener questions and discussed simple, practical steps to help people head into the new year feeling clear, calm and confident. Continue…

by Roger Montgomery Posted in Global markets, Investing Education, Market commentary, Podcast Channel.

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2025 has been an eventful year, with some strong returns – but what comes next? I joined Sean Aylmer from Fear and Greed for their Summer Series to break down the forces that shaped markets this year. Looking ahead to 2026, I explain why investors should expect higher volatility, limited future gains given today’s stretched valuations, and why rebalancing portfolios into alternative offerings that are uncorrelated to markets should be considered. 

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by Roger Montgomery Posted in Economics, Global markets, Market commentary, Podcast Channel.

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