Why Is Actuate Therapeutics ($ACTU) Stock Down -17.99% Today? (Find out why any stock moved today on Tickeron.) ACTU shares tumbled roughly 18% in early trading on October 7, 2026, to about $0.67, down from a prior close of $0.81. The primary catalyst was the company's filing of a Form S-1 to sell up to 50 million shares of common stock, signaling heavy dilution. The registration statement also highlighted a going-concern warning and a Nasdaq listing-standard deficiency notice.