JPMorgan analysts estimate that on October 10, when Wall Street suffered its sharpest one-day sell-off since April, leveraged ETFs were forced to sell US$26 billion of equities when the market closed in order to maintain their fixed leverage requirements. Photo by Richard Drew/AP Photo/Postmedia files

Daily share price swings worth hundreds of billions of dollars are becoming commonplace on Wall Street , highlighting the risks to investors as the Big Tech companies powering the stock market’s relentless rally grow more volatile .

Individual stocks have gained or lost more than US$100 billion in market value in a single day 119 times so far this year, the highest annual total on record.

The rise of 12-figure stock swings partly reflects the huge size of companies such as Nvidia,

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