(Reuters) -Shares of cloud-based ad tech firm Trade Desk fell by a third during premarket trading on Friday, after CEO Jeff Green warned about ongoing tariff uncertainty pressuring some of the world’s largest advertisers.

Trade Desk’s stock move looked set to wipe out over $12 billion from the company’s market valuation, if losses hold.

Changing trade policies have led to concerns about soft ad spending as companies are holding back on launching new campaigns, particularly in sectors directly affected by tariffs.

Trade Desk, which specializes in helping advertisers buy and optimize digital ad campaigns, has concentrated on large global advertisers.

This focus has made the company more vulnerable to wider economic pressures, in contrast to competitors who rely more on small and medium-s

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