Are Equity Markets Facing a Meltdown? What the Charts and Interest Rates Say
Share markets sold off in mid-October after a stronger-than-expected US inflation figure. The selling hit technology shares in New York and Asian share markets hardest. We use six share indices and the interest rate data to ask whether this is the start of a meltdown.
All prices in this piece are as at the close of ASX trading on 21 October 2026. US share indices, the VIX and the US 10-year Treasury yield are at the New York close, and the KOSPI and the Nikkei 225 at their own closes, on 21 October 2026.
What counts as a market meltdown
Traders measure a fall from the highest close of the past year. A fall of 5% to 10% is often called a pullback, 10% to 20% a correction, and 20% or more a bear market.
By these measures the US and Australian markets are not in a meltdown. None of the four US and ASX indices in FIG. 01 is in a correction. The S&P 500 is 0.8% below its highest close of the past year, 7,819 on 6 October. In Asia, South Korea's KOSPI is 37.1% below its high of 9,115 on 22 June, which puts it in a bear market. Japan's Nikkei 225 is 10.7% below its high on 25 June, which is a correction.
Most of the KOSPI's fall came between 22 June and 20 July, when it dropped 28.5%, well before this month's inflation figure. On 15 October, the day after that figure, the KOSPI fell 7.6% and the Nikkei 225 4.9%. The S&P/ASX 200 slipped 0.1% on 15 October and rose 1.0% on 16 October [R9].
Inflation and interest rates
US consumer prices rose 0.6% in September and 3.7% over the year, the Bureau of Labor Statistics reported on 14 October [R1]. Core inflation, which leaves out food and energy because they swing the most, was 2.6% over the year.
The US Federal Reserve had already raised its target rate by a quarter of a percentage point on 16 September, to 3.75% to 4.00% [R2]. The Fed next meets on 27 and 28 October [R3].
The US 10-year Treasury yield closed at 5.15% on 21 October. Its highest close this year was 5.31% on 5 October, the highest close since April 2002. A higher yield on a safe government bond makes shares less attractive by comparison. It also makes profits due years from now worth less today. Technology companies, whose value rests on those distant profits, feel this most.
The yield eased from 5.22% to 5.09% between 13 and 15 October while shares fell. The Associated Press linked the chip selling to worries about how long the artificial intelligence (AI) spending boom will last, and to bond yields worldwide climbing to their highest levels in years [R4].
Australia faces the same pressure, with inflation of 4.0% in the year to August [R5]. The Reserve Bank of Australia (RBA) has raised its cash rate four times this year, the last to 4.60% at the end of September [R6].
What the charts show
The 200-day moving average is the average closing level over the last 200 trading days, about ten months. The S&P 500 and the Nasdaq Composite are above their 200-day averages, by 6.5% and 6.9%. The S&P/ASX 200 closed at 8,831, 4.7% below its high of 9,272 on 6 August, and just above its 200-day average of 8,829, right on its long-term trend line. The weakest of the four US and ASX indices is the Russell 2000, an index of about 2,000 smaller US companies. It is 9.4% below its high of 3,068 on 14 August, close to the 10% line, and below its 200-day average.
The Cboe Volatility Index (VIX) is calculated from the prices of options on the S&P 500 [R7]. Option prices rise when investors want protection. The VIX turns those prices into the size of the move investors expect over the next 30 days. The VIX closed at 16.68 on 21 October, below its average since 1990 of 19.4. In plain terms, investors are not paying up for protection. FIG. 02 shows the past two years.
THE OTHER WAY TO READ THIS An index can look calm while many shares inside it fall. The S&P 500 is weighted by company size, so a small group of very large companies can hold it up. On 16 October all but seven of the 75 technology stocks in the S&P 500 closed lower, the Associated Press reported [R4]. So a steady S&P 500 can understate how widely shares are falling. |
What would change this reading
Four events would point to something worse than the current dip in the US and Australia. One is the S&P 500 closing below its 200-day average, now about 7,284. Another is the ASX 200 closing below its 200-day average, or the Russell 2000 closing more than 10% below its high. A third is the VIX closing above 30, a level it last reached on 30 March 2026. The last is the US 10-year yield closing above this year's high of 5.31%.
Samso Concluding Comments
We see a sell-off centred on technology shares and Asian markets. It came after a stronger-than-expected US inflation figure, with the US 10-year yield already close to its highest level since 2002. South Korea's KOSPI is in a bear market, mostly from its fall in June and July. None of the four US and ASX indices has reached a correction. In our experience a meltdown usually needs something that forces selling, such as a credit event or a bank in trouble. The data here does not cover credit markets, so it cannot show whether that is happening.
Shares that depend on profits far in the future are the most exposed to a high US 10-year yield. For ASX investors, the next local tests are the September inflation figure on 28 October [R5] and the RBA decision on 3 November [R8]. Is this a meltdown, or a market adjusting to a US bond yield it has not seen since 2002?
References and sources
Each source is listed in the order it is first used. FIG. 01 and FIG. 02 are original Samso illustrations of sourced data, drawn from Yahoo Finance daily closes. Every market price is as at the date in the price date statement at the top of the piece.
[R9] Yahoo Finance daily closes for the S&P 500 (^GSPC), Nasdaq Composite (^IXIC), Russell 2000 (^RUT), S&P/ASX 200 (^AXJO), KOSPI (^KS11), Nikkei 225 (^N225), Cboe Volatility Index (^VIX, from 2 January 1990) and Cboe 10-year Treasury yield index (^TNX, from 2 January 1990), to 21 October 2026. Every high, average and fall is Samso's own calculation from these closes.
Cover photo, New York Stock Exchange Entrance, Balon Greyjoy. CC0, via Wikimedia Commons.
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