Single-day corrections concentrate the mind, even more so when the slide comes amid a doubling of a tech-focused index replete with the kind of giant chip stocks that have powered U.S. markets to record highs over most of the year. “The session had three things working against it simultaneously,” said Koen Hoorelbeke, investment and options strategist at Saxo Bank. In short, it’s become the index to watch in this year’s global chips race, with SK Hynix and Samsung booking triple-digit gains and old-school car maker Hyundai —which is now verging into chip design through its Hyundai Mobis division—rising more than 70%.