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Shares of The Trade Desk plummeted 39% on Friday, their worst day on record, after the ad-tech company announced the departure of its CFO and analysts expressed concerns about rising competition from Amazon .

The Trade Desk, which went public in 2016, suffered its steepest prior drop in February, when the shares fell 33% on a revenue miss. In its second-quarter earnings report late Thursday, the company beat expectations on earnings and revenue, but the results failed to impress investors.

The Trade Desk, which specializes in providing technology to companies that want to target users across the web, said finance chief Laura Schenkein is leaving the job and being replaced by Alex Kayyal,

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