Aug 8 – The Trade Desk (NASDAQ:TTD) dropped nearly 40% on Friday after warning that new U.S. tariffs are making advertisers nervous, and it’s hitting the company hard. CEO Jeff Green told analysts that many of its big-brand clients are dialing back ad spending due to economic uncertainty and pressure from tariffs.

The warning overshadowed an 18.7% year-over-year revenue jump to $694 million, which beat expectations. But adjusted earnings per share landed at $0.41, just short of forecasts.

Adding to the shakeup, the company also announced a leadership change. Board member Alex Kayyal is stepping in as the new CFO, replacing Laura Schenkein, who will stay on through the end of the year to support the transition.

TTD shares, which recently gained momentum after joining the S&P 500, have now erased those gains, and more, dropping below $55 and down over 50% for the year.

The combination of geopolitical pressures and internal changes is leaving investors wary of what’s next for one of the ad tech sector’s biggest names.

This article first appeared on GuruFocus.