Investor Alert: Rosen Law Firm Encourages Gossamer Bio Shareholders to Seek Counsel Amid Securities Class Action Deadline

Gossamer Bio, Inc. (NASDAQ: GOSS) investors are facing a critical deadline on June 1, 2026, as a securities class action lawsuit has been filed against the company. The Rosen Law Firm, a global investor rights law firm, is reminding purchasers of Gossamer securities between June 16, 2025, and February 20, 2026, that they may be entitled to compensation without incurring any out-of-pocket fees or costs through a contingency fee arrangement.

The lawsuit alleges that defendants made false and misleading statements to investors regarding the study design for Gossamer's Phase 3 PROSERA study. Specifically, the complaint claims that the company failed to control for the placebo response at Latin American testing sites, leading to a significant decline in the stock price when the truth was revealed. As a result, investors who purchased Gossamer securities during the Class Period may have suffered damages.

The Rosen Law Firm has a proven track record of success in securities class action litigation, with numerous high-profile cases and settlements under its belt. In 2017, the firm was ranked No. 1 by ISS Securities Class Action Services for the number of securities class action settlements. The firm has also been recognized as one of the top four securities class action firms in the country every year since 2013, with hundreds of millions of dollars recovered for investors.

Investors who wish to join the class action or seek more information can visit the Rosen Law Firm's website at https://rosenlegal.com/submit-form/?case_id=61894 or contact Phillip Kim, Esq. toll-free at 866-767-3653 or via email at case@rosenlegal.com. It is essential for investors to select a qualified and experienced law firm to represent their interests, as the outcome of the case may have a significant impact on their financial well-being.

The securities class action lawsuit against Gossamer Bio is a complex and high-stakes case that requires the expertise of a seasoned law firm like the Rosen Law Firm. With a deep understanding of securities laws and regulations, the firm is well-equipped to navigate the complexities of the case and fight for the rights of investors. As the June 1, 2026, deadline approaches, investors are urged to take action and seek counsel to protect their interests.

The case highlights the importance of transparency and accountability in the financial markets. Investors have a right to expect that companies will provide accurate and truthful information about their operations and financial performance. When companies fail to meet these expectations, investors may suffer significant losses, and it is the role of law firms like the Rosen Law Firm to hold them accountable.