D. E. Shaw & Co. Reduces Stake in Gossamer Bio to 6.0%

On August 24, 2026, D. E. Shaw & Co., L.P. and its affiliates, including David E. Shaw, filed Amendment No. 3 to their Schedule 13D regarding Gossamer Bio, Inc. (GOSS). The filing reports a decrease in beneficial ownership to 29,128,194 shares of Common Stock, representing approximately 6.0% of the company's outstanding shares. This is a reduction from the 7.1% ownership (34,609,565 shares) previously reported. The shares are held through D. E. Shaw Valence Portfolios, L.L.C. (5.7%) and D. E. Shaw Cogence Portfolios, L.L.C. (0.3%). The reduction resulted from a series of open-market sales conducted between July 27, 2026, and August 24, 2026, at various weighted average prices ranging from approximately $0.14 to $0.22 per share. D. E. Shaw & Co., L.P. acts as the investment adviser, while D. E. Shaw & Co., L.L.C. serves as the manager for the funds. David E. Shaw, as the sole shareholder of the entities controlling these managers, disclaims beneficial ownership of the shares.