Tempus AI is trading 12.64% up at $55.40, with no clear company-specific catalyst identified for August 19, 2026.

  • Latest listed releases were the August 4 PRISM2 study and July 30 second-quarter results.
  • The move appears disconnected from the mixed broader market: the S&P 500 was up 0.24%, while the Nasdaq Composite was down 0.10%.
  • Elevated short interest may be contributing to volatility, but causation is unconfirmed.