Context Capital Management, LLC Acquires 9.9% Stake in Gossamer Bio, Inc.

On June 9, 2026, Context Capital Management, LLC, along with affiliated entities and individuals, filed a Schedule 13G disclosing a new 9.9% stake in Gossamer Bio, Inc. (GOSS). The reporting persons, including Michael S. Rosen, William D. Fertig, Charles E. Carnegie, and Context Partners Master Fund, L.P., collectively hold 48,835,788 shares of common stock. This position was established following an event on June 4, 2026. The filing indicates that Context Capital Management, LLC serves as the investment adviser and general partner to the Master Fund, while Rosen, Fertig, and Carnegie act as control persons. The reporting persons have shared voting and dispositive power over the shares. The calculation of the 9.9% ownership is based on a total of 488,846,722 shares outstanding, which includes a significant issuance of over 254 million shares reported by the issuer in early June. The filers certified that the acquisition was not intended to influence or change the control of the issuer.