The Hindenburg Omen, a stock market phenomenon, has flashed on both the NYSE and the Nasdaq overnight and is raising questions regarding whether the all time high run up caused by AI stocks has been hiding problems with U.S. shares.
The indicator activated at once on both markets on Thursday in New York and a market analytics company, this is the first time the event took place just 19 times in market history.
The last time this particular setup occurred was in 1987 and 2007, which were years prior to two of the most devastating stock market crashes in the history of modern market trading.
It lights up when a significantly greater percentage of securities reaches new peaks and valleys, which means that only a minority of shares are responsible for a rally and most of them are losing steam.
That fits with Wall Street’s current picture.
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The S&P 500 has climbed to around 7,500 points and mega cap tech and AI stocks make up more than half of the index’s weighting, according to JPMorgan research.
But underneath the surface, a growing number of consumer facing and smaller companies have been sliding to new lows.
How seriously to take it
According to chartists, the indicator preceded the 1987 Black Monday crash, the bursting of the dot com bubble in 2000, the 2008 financial crisis and even the precipitous drop in 2020 due to the pandemic.
However, the indicator often leads to false alerts, with one study estimating the failure rate at 80%.
SentimenTrader estimates that the S&P 500 index has generated positive returns in only 39% of the five month period following past dual triggers.
Additionally, this is not the only cluster of signals to emerge within months.
The ominous indicator triggered two times in succession during late October of last year, marking its first occurrence since early March of 2025, only days after the United States stock markets experienced a decline of 20% following President Donald Trump’s declaration of an emergency tariff hike.
While chart technicians often await further corroboration before forming their opinion, the recent alert will likely cause concern in a market already fearful of overvalued asset prices.
It’s important for Australian investors to read through. The local sharemarket generally tracks Wall St and any US tech weakness will pass through to the ASX, miners, banks and superannuation balances linked to global equities.
With AI trade now accounting for such a large slice of the S&P 500, even a modest unwind could quickly ripple into household wealth in Sydney and Melbourne.
