Why Is Astrana Health ( $ASTH ) Stock Down -5.53% Today? (Find out why any stock moved today on Tickeron.) Shares of ASTH fell 5.53% to $33.17, a decline of $1.94 from the prior session's close of $35.11. The primary catalyst was a regulatory filing disclosing a "material" cybersecurity incident at its Astrana Health Management subsidiary. The incident involved social engineering, with threat actors impersonating employees and spoofing the company's corporate phone number. $SGRY $HCA $NHC $STLN $ACHC