Why Trade Desk Stock Lost 52% in the First Half of 2026

Trade Desk's stock plummeted 52% in H1 2026 due to slowing revenue growth (from 20%+ to 8% guidance), a public dispute with major client Publicis Groupe over fee allegations, and executive turnover including a CFO departure. The dispute was settled in June, but the company faces headwinds from competition and decelerating growth, though CEO confidence and profitability remain.