Table of Contents sAs filed with the Securities and Exchange Commission on April 8, 2026. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Avalyn Pharma Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2834 45-2463191 (I.R.S. Employer Identification Number) Avalyn Pharma Inc. 105 W First Street Boston, Massachusetts 0 ...