Gossamer Bio Faces Class Action Lawsuit Reminder
Written by Emily J. Thompson, Senior Investment Analyst
Updated: May 08 2026
0mins
Source: Globenewswire
- Class Action Reminder: The Schall Law Firm reminds investors of a class action lawsuit against Gossamer Bio for violations of §§10(b) and 20(a) of the Securities Exchange Act, concerning securities purchased between June 16, 2025, and February 20, 2026, with a deadline to contact the firm by June 1, 2026, for participation.
- False Statements Allegation: The complaint alleges that Gossamer concealed adverse facts regarding the design of its Phase 3 PROSERA study, particularly concerning controls for placebo response at certain testing sites, rendering the company's public statements false and materially misleading throughout the class period.
- Investor Losses: As the market learned the truth about Gossamer, investors suffered damages, indicating significant deficiencies in the company's disclosure practices that could impact future stock performance and investor confidence.
- Legal Consultation Opportunity: The Schall Law Firm offers free consultations and encourages affected shareholders to reach out to discuss their rights, demonstrating the firm's commitment to protecting investor interests and providing support for potential legal actions.
Trade with 70% Backtested Accuracy
Stop guessing "Should I Buy GOSS?" and start using high-conviction signals backed by rigorous historical data.
Sign up today to access powerful investing tools and make smarter, data-driven decisions.
Analyst Views on GOSS
Wall Street analysts forecast GOSS stock price to rise
4 Analyst Rating
3 Buy
1 Hold
0 Sell
Strong Buy
Current: 0.201
Low
10.00
Averages
12.33
High
15.00
Current: 0.201
Low
10.00
Averages
12.33
High
15.00
About GOSS
Gossamer Bio, Inc. is a late-stage, clinical biopharmaceutical company, which is focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension and pulmonary hypertension associated with interstitial lung disease (PH-ILD). Seralutinib, also known as GB002, is an investigational inhaled, small-molecule, platelet-derived growth factor receptor (PDGFR), colony-stimulating factor 1 receptor (CSF1R), and c-KIT inhibitor, being evaluated in a Phase III clinical trial for the treatment of PAH. Seralutinib is designed to target the mechanisms that underlie pulmonary hypertension and to be delivered to the site of disease, via dry powder inhaler. Seralutinib is being evaluated in a Phase III clinical trial for the treatment of pulmonary arterial hypertension (PAH). Inhaled seralutinib, which is designed to act on both isoforms of the PDGFR, α and β, as well as the CSF1R and c-KIT pathways.
About the author
Emily J. Thompson
Emily J. Thompson, a Chartered Financial Analyst (CFA) with 12 years in investment research, graduated with honors from the Wharton School. Specializing in industrial and technology stocks, she provides in-depth analysis for Intellectia’s earnings and market brief reports.
Gossamer Bio Faces Class Action Lawsuit Reminder
- Class Action Initiated: Robbins LLP reminds investors of a class action filed on behalf of shareholders who purchased Gossamer Bio (NASDAQ:GOSS) securities between June 16, 2025, and February 20, 2026, alleging that the company misled investors regarding its PROSERA study, resulting in shareholders buying stock at artificially inflated prices.
- Study Results Fail: On February 23, 2026, Gossamer announced that its Phase 3 PROSERA study failed to meet its primary endpoint, achieving only a +13.3 meter placebo-adjusted gain in six-minute walk distance (6MWD), which did not meet the required 0.025 alpha threshold, causing the stock price to plummet over 80% in a single day.
- Severe Investor Losses: Following the disappointing study results, Gossamer's stock price dropped from $2.13 per share on February 20, 2026, to $0.42 per share, leading to significant losses for investors, with the class action aiming to seek compensation for affected shareholders.
- Shareholder Action Guide: Shareholders wishing to serve as lead plaintiffs in the class action must submit their papers by June 1, 2026, with Robbins LLP offering contingency fee representation, ensuring shareholders can potentially recover losses without upfront costs.
See More
Gossamer Bio Faces Securities Class Action Lawsuit
- Lawsuit Background: Gossamer Bio, Inc. is facing a securities class action lawsuit due to its February 23, 2026 announcement that the PROSERA study failed to meet its primary endpoint, involving investors from June 16, 2025, to February 20, 2026, indicating potential missteps in clinical trial design.
- Stock Price Plunge: Following the lawsuit announcement, Gossamer's stock price plummeted by 80%, reflecting market disappointment over the clinical trial results, which directly impacts investor confidence and may lead to further capital outflows.
- Legal Investigation: Hagens Berman has initiated an investigation into whether Gossamer violated federal securities laws, particularly regarding disclosures about the PROSERA trial design, which could expose the company to greater legal risks and financial losses.
- Listing Risk: Gossamer revealed on April 9, 2026, that it has not met the minimum bid price required for continued listing on the Nasdaq Global Select Market since February 24, 2026, potentially facing delisting risks that exacerbate investor concerns.
See More
Reminder of Gossamer Bio Securities Class Action
- Class Action Notice: Rosen Law Firm reminds investors who purchased Gossamer Bio securities between June 16, 2025, and February 20, 2026, to apply as lead plaintiffs by June 1, 2026, to participate in the class action and potentially receive compensation without any out-of-pocket costs.
- Lawsuit Background: The lawsuit alleges that defendants made overwhelmingly positive statements about Gossamer's Phase 3 PROSERA study while concealing significant adverse facts regarding the study design, resulting in investor losses when the truth emerged.
- Law Firm Credentials: Rosen Law Firm specializes in securities class actions and has recovered over $438 million for investors in 2019 alone, being ranked first in 2017 for the number of securities class action settlements, showcasing its strong reputation in this field.
- Investor Selection Advice: Investors are advised to carefully select qualified counsel with a proven track record, avoiding firms that merely act as intermediaries, to ensure they receive the best legal support and potential compensation in the class action.
See More
Class Action Lawsuit Filed Against Gossamer Bio, Inc.
- Lawsuit Background: Bronstein, Gewirtz & Grossman has filed a class action lawsuit against Gossamer Bio, alleging violations of federal securities laws on behalf of all investors who purchased Gossamer securities between June 16, 2025, and February 20, 2026.
- False Statements Allegation: The complaint claims that Gossamer misled investors by touting positive results from its PROSERA study while concealing significant adverse facts regarding the study's design at Latin American sites, resulting in artificially inflated stock prices that harmed investors.
- Investor Action: Affected investors have until June 1, 2026, to request to be appointed as lead plaintiff, with the law firm operating on a contingency fee basis, ensuring no upfront costs for investors wishing to join the lawsuit.
- Law Firm Credentials: Bronstein, Gewirtz & Grossman is recognized for recovering hundreds of millions for investors in securities fraud class actions, emphasizing its commitment to restoring investor capital and ensuring corporate accountability in the marketplace.
See More
Gossamer Bio Faces Class Action Lawsuit
- Class Action Reminder: The Schall Law Firm alerts investors of a class action lawsuit against Gossamer Bio for violations of §§10(b) and 20(a) of the Securities Exchange Act, concerning securities purchased between June 16, 2025, and February 20, 2026, with a deadline to contact the firm by June 1, 2026, for participation.
- False Statement Allegations: The complaint alleges that Gossamer concealed adverse facts regarding the design of its Phase 3 PROSERA study, particularly concerning controls for placebo response at certain testing sites, rendering its public statements false and materially misleading throughout the class period.
- Investor Losses: As the market learned the truth about Gossamer, investors suffered damages, indicating serious deficiencies in the company's disclosure practices that could impact future stock performance and investor confidence.
- Legal Consultation Opportunity: The Schall Law Firm offers free consultations, encouraging affected shareholders to reach out to discuss their rights, demonstrating the firm's commitment to protecting investor interests while highlighting the potential legal risks facing Gossamer.
See More
Multiple Companies Facing Class Action Lawsuits
- Pinterest Lawsuit Overview: Pinterest, Inc. is facing allegations of false statements during the class period from February 7, 2025, to February 12, 2026, which may lead to significant revenue losses and potential restructuring, with a lead plaintiff deadline of May 29, 2026.
- New Era Energy Allegations: New Era Energy & Digital, Inc. is accused of overstating progress on its Texas data center project and engaging in fraudulent schemes from November 6, 2024, to December 29, 2025, with a lead plaintiff deadline of June 1, 2026.
- Gossamer Bio Lawsuit Details: Gossamer Bio, Inc. faces claims of failing to disclose the failure of its clinical trial from June 16, 2025, to February 20, 2026, misleading investors about the company's prospects, with a lead plaintiff deadline of June 1, 2026.
- Medpace Holdings Lawsuit Information: Medpace Holdings, Inc. is accused of making false statements regarding its financial metrics from April 22, 2025, to February 9, 2026, with a lead plaintiff deadline of June 8, 2026, potentially impacting the company's future financing capabilities.
See More
Gossamer Bio Faces Class Action Lawsuit Reminder
- Class Action Initiated: Robbins LLP reminds investors of a class action filed on behalf of shareholders who purchased Gossamer Bio (NASDAQ:GOSS) securities between June 16, 2025, and February 20, 2026, alleging that the company misled investors regarding its PROSERA study, resulting in shareholders buying stock at artificially inflated prices.
- Study Results Fail: On February 23, 2026, Gossamer announced that its Phase 3 PROSERA study failed to meet its primary endpoint, achieving only a +13.3 meter placebo-adjusted gain in six-minute walk distance (6MWD), which did not meet the required 0.025 alpha threshold, causing the stock price to plummet over 80% in a single day.
- Severe Investor Losses: Following the disappointing study results, Gossamer's stock price dropped from $2.13 per share on February 20, 2026, to $0.42 per share, leading to significant losses for investors, with the class action aiming to seek compensation for affected shareholders.
- Shareholder Action Guide: Shareholders wishing to serve as lead plaintiffs in the class action must submit their papers by June 1, 2026, with Robbins LLP offering contingency fee representation, ensuring shareholders can potentially recover losses without upfront costs.
See More
Gossamer Bio Faces Securities Class Action Lawsuit
- Lawsuit Background: Gossamer Bio, Inc. is facing a securities class action lawsuit due to its February 23, 2026 announcement that the PROSERA study failed to meet its primary endpoint, involving investors from June 16, 2025, to February 20, 2026, indicating potential missteps in clinical trial design.
- Stock Price Plunge: Following the lawsuit announcement, Gossamer's stock price plummeted by 80%, reflecting market disappointment over the clinical trial results, which directly impacts investor confidence and may lead to further capital outflows.
- Legal Investigation: Hagens Berman has initiated an investigation into whether Gossamer violated federal securities laws, particularly regarding disclosures about the PROSERA trial design, which could expose the company to greater legal risks and financial losses.
- Listing Risk: Gossamer revealed on April 9, 2026, that it has not met the minimum bid price required for continued listing on the Nasdaq Global Select Market since February 24, 2026, potentially facing delisting risks that exacerbate investor concerns.
See More
Reminder of Gossamer Bio Securities Class Action
- Class Action Notice: Rosen Law Firm reminds investors who purchased Gossamer Bio securities between June 16, 2025, and February 20, 2026, to apply as lead plaintiffs by June 1, 2026, to participate in the class action and potentially receive compensation without any out-of-pocket costs.
- Lawsuit Background: The lawsuit alleges that defendants made overwhelmingly positive statements about Gossamer's Phase 3 PROSERA study while concealing significant adverse facts regarding the study design, resulting in investor losses when the truth emerged.
- Law Firm Credentials: Rosen Law Firm specializes in securities class actions and has recovered over $438 million for investors in 2019 alone, being ranked first in 2017 for the number of securities class action settlements, showcasing its strong reputation in this field.
- Investor Selection Advice: Investors are advised to carefully select qualified counsel with a proven track record, avoiding firms that merely act as intermediaries, to ensure they receive the best legal support and potential compensation in the class action.
See More
Class Action Lawsuit Filed Against Gossamer Bio, Inc.
- Lawsuit Background: Bronstein, Gewirtz & Grossman has filed a class action lawsuit against Gossamer Bio, alleging violations of federal securities laws on behalf of all investors who purchased Gossamer securities between June 16, 2025, and February 20, 2026.
- False Statements Allegation: The complaint claims that Gossamer misled investors by touting positive results from its PROSERA study while concealing significant adverse facts regarding the study's design at Latin American sites, resulting in artificially inflated stock prices that harmed investors.
- Investor Action: Affected investors have until June 1, 2026, to request to be appointed as lead plaintiff, with the law firm operating on a contingency fee basis, ensuring no upfront costs for investors wishing to join the lawsuit.
- Law Firm Credentials: Bronstein, Gewirtz & Grossman is recognized for recovering hundreds of millions for investors in securities fraud class actions, emphasizing its commitment to restoring investor capital and ensuring corporate accountability in the marketplace.
See More
Gossamer Bio Faces Class Action Lawsuit
- Class Action Reminder: The Schall Law Firm alerts investors of a class action lawsuit against Gossamer Bio for violations of §§10(b) and 20(a) of the Securities Exchange Act, concerning securities purchased between June 16, 2025, and February 20, 2026, with a deadline to contact the firm by June 1, 2026, for participation.
- False Statement Allegations: The complaint alleges that Gossamer concealed adverse facts regarding the design of its Phase 3 PROSERA study, particularly concerning controls for placebo response at certain testing sites, rendering its public statements false and materially misleading throughout the class period.
- Investor Losses: As the market learned the truth about Gossamer, investors suffered damages, indicating serious deficiencies in the company's disclosure practices that could impact future stock performance and investor confidence.
- Legal Consultation Opportunity: The Schall Law Firm offers free consultations, encouraging affected shareholders to reach out to discuss their rights, demonstrating the firm's commitment to protecting investor interests while highlighting the potential legal risks facing Gossamer.
See More
Multiple Companies Facing Class Action Lawsuits
- Pinterest Lawsuit Overview: Pinterest, Inc. is facing allegations of false statements during the class period from February 7, 2025, to February 12, 2026, which may lead to significant revenue losses and potential restructuring, with a lead plaintiff deadline of May 29, 2026.
- New Era Energy Allegations: New Era Energy & Digital, Inc. is accused of overstating progress on its Texas data center project and engaging in fraudulent schemes from November 6, 2024, to December 29, 2025, with a lead plaintiff deadline of June 1, 2026.
- Gossamer Bio Lawsuit Details: Gossamer Bio, Inc. faces claims of failing to disclose the failure of its clinical trial from June 16, 2025, to February 20, 2026, misleading investors about the company's prospects, with a lead plaintiff deadline of June 1, 2026.
- Medpace Holdings Lawsuit Information: Medpace Holdings, Inc. is accused of making false statements regarding its financial metrics from April 22, 2025, to February 9, 2026, with a lead plaintiff deadline of June 8, 2026, potentially impacting the company's future financing capabilities.
See More
