Humans are no longer the ones setting the breakneck pace on Wall Street.

The New York Stock Exchange is now processing 1.2 trillion order messages per day, a staggering threefold jump from just four years ago, according to New York Stock Exchange President Lynn Martin. The surge, she said, is being driven by AI-fueled trading, algorithmic strategies, and hyperspeed market participants that have transformed the structure of U.S. markets.

“When I first took this job four years ago, COVID was still rearing its ugly head, and a volatile day in our market saw about 350 billion incoming order messages a day,” Martin said during an interview with Fortune at the Most Powerful Women summit . “This past April, a peak day for us was 1.2 trillion messages.”

Each message on the stock exchange re

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