Medpace Holdings is trading 18.85% down at $479 now after broad risk-off selling, following the regular session close at $590.30 on August 18, 2026.

  • The Nasdaq Composite fell 1.56%, while the S&P 500 declined 0.68%.
  • No new company-specific announcement or earnings release was identified for August 18; recent coverage focused on July’s Q2 beat and raised guidance.
  • Rising Treasury yields, geopolitical uncertainty, and technology-led selling likely contributed to extended-hours weakness.