Athira Pharma(ATHA) - Prospectus(update)

TO UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 PRE-EFFECTIVE AMENDMENT NO. 1 FORM S‑3 ON FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 LeonaBio, Inc. (Exact name of registrant as specified in its charter) As filed with the Securities and Exchange Commission on March 31, 2026 Registration No. 333-292826 (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) Delaware 2836 45-3368487 (I.R.S. Employer ...