TPST ▲ +42.9% - Tempest Therapeutics, Inc. $TPST new highs AHs following earlier headlines Tempest Therapeutics shares surged 42.9% today following positive headlines that drove the stock to new highs in after-hours trading. The significant rally reflects investor enthusiasm over developments in the company's pipeline or clinical programs, though specific details were not provided in available reporting. 15-SEP-2026 04:23 PM ET