Pinterest Inc. and Zoom Video Communications Inc. soared in their trading debuts Thursday, a sign of investors’ undiminished appetite for fast-growing technology companies.

Shares of Pinterest and Zoom closed up 28% and 72% above their respective initial public offering prices. Pinterest’s so-called first-day pop exceeded the U.S.-listed tech company’s average pop since 2010, according to Dealogic. But Zoom’s climb was even more pronounced. It is the best first-day pop since Twitter Inc.’s 2013 debut, and only eight other…

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