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Gossamer Bio, Inc. (Nasdaq: GOSS), a clinical-stage biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with interstitial lung disease (PH-ILD), today announced that the Company will present at the Cantor Global Healthcare Conference to take place on September 9-11, 2026.

Cantor Global Healthcare Conference

Date / Time: September 9th, at 10:55 AM ET
Format: Presentation & 1x1’s
Location: NYC, NY
Webcast Link: Here

About Gossamer Bio

Gossamer Bio is a biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension and pulmonary hypertension associated with interstitial lung disease. Its goal is to be an industry leader in, and to enhance the lives of patients living with pulmonary hypertension.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260904867053/en/

Disclosures I/we have no positions in any stocks mentioned, and have no plans to buy any new positions in the stocks mentioned within the next 72 hours.

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Gossamer Bio, Inc. (Nasdaq: GOSS) (the “Company” or “Gossamer”), a clinical-stage biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with interstitial lung disease (PH-ILD), today announced that it has entered into a securities purchase agreement with certain new and existing institutional investors for a private placement financing expected to provide aggregate gross proceeds of up to approximately $250 million, before deducting placement agent fees and estimated offering expenses. The private placement consists of an initial closing, a committed second closing contingent upon FDA acceptance of the seralutinib new drug application (NDA) in PAH (the NDA Acceptance Milestone) and warrants exercisable upon FDA approval of seralutinib in PAH (the FDA Approval Milestone). The financing follows the Company’s recent reacquisition of worldwide rights to seralutinib and is in advance of the planned NDA submission in September 2026.

The private placement includes $150 million of committed capital, consisting of approximately $25 million to be funded at the initial closing and an additional approximately $125 million to be funded at a second closing upon FDA acceptance of the seralutinib NDA in PAH. The investors’ obligations to fund the second closing remain subject to the NDA Acceptance Milestone occurring in 2026 and the satisfaction of other customary closing conditions. If the NDA Acceptance Milestone occurs in 2026, the Company expects to receive the full $150 million of committed capital in 2026.

The private placement includes participation from new and existing institutional investors, including EcoR1 Capital, 683 Capital Partners, LP, RA Capital Management, Coastlands Capital, Samsara BioCapital and Rock Springs Capital, among others.

“This financing is expected to provide the capital needed to advance seralutinib through potential FDA approval in PAH,” said Faheem Hasnain, Chairman, Co-Founder and Chief Executive Officer of Gossamer Bio. “The committed funding structure aligns capital availability with key regulatory milestones and is expected to support the planned submission and review of our NDA. We appreciate the support of this group of leading healthcare investors as we work to bring a potentially important new treatment option to patients with PAH.”

Private Placement Terms

Pursuant to the terms of the securities purchase agreement, the private placement consists of the following three components, in each case subject to the satisfaction of customary closing conditions and the beneficial ownership limitations applicable to each investor:

Initial Closing. At the initial closing, the Company will issue and sell pre-funded warrants for aggregate gross proceeds of approximately $25 million at a purchase price of $0.1399 per pre-funded warrant, representing a common stock-equivalent price of $0.14 minus the $0.0001 per share exercise price of each pre-funded warrant. The initial closing is expected to occur on or about August 24, 2026.

Second Closing. Upon the NDA Acceptance Milestone, and subject to the NDA Acceptance Milestone occurring in 2026 and the satisfaction of other customary closing conditions, the participating investors will be obligated to purchase pre-funded warrants at a second closing for additional aggregate gross proceeds of approximately $125 million. The purchase price per pre-funded warrant will equal the lesser of $0.1399 and the five-day volume-weighted average price of the Company’s common stock preceding the second closing, in each case minus the $0.0001 per-share exercise price of each pre-funded warrant.

FDA Approval Warrants. At the second closing, the participating investors will also receive, for no additional consideration, warrants exercisable upon the FDA Approval Milestone. If exercised in full for cash at an exercise price of $0.187 per share, the FDA approval warrants (the FDA Approval Warrants) would provide the Company with additional aggregate gross proceeds of up to approximately $100 million. The FDA Approval Warrants will expire on the earliest of (i) the 30th day following the date the Company provides notice of the FDA Approval Milestone having been achieved and (ii) five years following the issuance date of the FDA Approval Warrants.

Additional details regarding the private placement, the securities purchase agreement, the pre-funded warrants, FDA Approval Warrants and non-voting convertible preferred stock can be found in the Current Report on Form 8-K to be filed by the Company with the Securities and Exchange Commission (SEC) today.

Preferred Stock and Stockholder Approval

Prior to obtaining stockholder approval, the pre-funded warrants and FDA Approval Warrants will be exercisable for shares of the Company’s non-voting convertible preferred stock, designated Series A-1, Series A-2 and Series A-3, as applicable. Following stockholder approval, each series of non-voting convertible preferred stock will be automatically converted (subject to certain exceptions) into common stock at the applicable per share price described above. The exercise of the warrants and conversion of the non-voting convertible preferred stock will in each case be subject to the beneficial ownership limitations elected by the applicable investor.

The Company will seek the stockholder approval necessary under applicable Nasdaq listing rules for the issuance of common stock upon exercise of the warrants and conversion of the non-voting convertible preferred stock at a special meeting of stockholders, which it has agreed to hold following the initial closing. In connection with the private placement, the Company and the Company’s directors and executive officers have entered into lock-up agreements.

Use of Proceeds

The Company intends to use the net proceeds, together with its existing cash, cash equivalents and marketable securities, to advance the clinical development and potential commercialization of seralutinib in PAH and PH-ILD, and for other general corporate purposes and working capital. The Company expects that the net proceeds from the initial closing and the committed capital from the second closing, together with its existing cash resources, will fund its operations into 2028.

Placement Agents

Leerink Partners and Cantor are acting as joint placement agents in connection with the private placement.

Registration Rights and Unregistered Securities

The Company has agreed to file one or more registration statements with the Securities and Exchange Commission (SEC) covering the resale of the shares of common stock issuable pursuant to the private placement, including upon exercise of the warrants and conversion of the preferred stock.

The securities described above are being sold in a private placement in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended (the Securities Act), and Regulation D promulgated thereunder, and have not been registered under the Securities Act or applicable state securities laws. Accordingly, such securities may not be offered or sold in the United States absent registration with the SEC or an applicable exemption from such registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful.

About Gossamer Bio

Gossamer Bio is a biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension and pulmonary hypertension associated with interstitial lung disease. Its goal is to be an industry leader in, and to enhance the lives of patients living with, pulmonary hypertension.

Forward-Looking Statements

Gossamer cautions you that statements contained in this press release regarding matters that are not historical facts are forward-looking statements. These statements are based on the Company’s current beliefs and expectations. Such forward-looking statements include, but are not limited to, statements regarding: the expected timing, completion and terms of the private placement; the amount and timing of gross proceeds, including the potential to achieve the NDA Acceptance Milestone and consummate the second closing and the Company’s expectation that the committed capital would be funded in 2026; the potential achievement of the FDA Approval Milestone; the receipt of stockholder approval at the proposed special meeting; the intended use of proceeds and the expected timeframe for funding the Company’s operating plan into 2028; and the development potential and market opportunity of seralutinib in PAH, PH-ILD and other indications. The inclusion of forward-looking statements should not be regarded as a representation by Gossamer that any of its plans will be achieved. Actual results may differ from those set forth in this press release due to the risks and uncertainties inherent in Gossamer’s business, including, without limitation: the risks and uncertainties associated with market conditions and the satisfaction of customary closing conditions related to the proposed financing; the financing may not be completed on the terms described or at all, and the milestones triggering the second closing and/or exercise of the FDA Approval Warrants may not be achieved; the risk that Gossamer’s planned NDA submission is based in part on its views following its recent meeting with the FDA and the official minutes therefrom and later feedback from the FDA, which may be inconsistent with such meeting or Gossamer’s views from such meeting; later developments with the FDA may be inconsistent with the feedback from prior meetings; the FDA may determine that our planned NDA does not qualify for filing; the results of the Company’s clinical trials, including the Phase 3 PROSERA and Phase 2 TORREY studies, may not be deemed sufficient by the FDA to serve as the basis for regulatory approval of seralutinib, including the risk that the FDA determines that the overall benefit-risk assessment of seralutinib is not favorable; any path forward may require additional capital and other resources, which may not be available on reasonable terms, if at all, or may limit the commercial opportunity for seralutinib; the Company’s future performance is dependent entirely on the success of seralutinib; potential delays in the commencement, enrollment and completion of clinical trials; disruption to our operations from unexpected events, including clinical trial delays; the Company’s dependence on third parties in connection with product manufacturing, research and preclinical and clinical testing; the results of preclinical studies and early clinical trials with seralutinib are not necessarily predictive of future results; regulatory developments in the United States and foreign countries; adverse side effects or inadequate efficacy of seralutinib that may limit its development, regulatory approval and/or commercialization, or may result in clinical holds, recalls or product liability claims; Gossamer’s ability to obtain and maintain intellectual property protection for seralutinib; Gossamer may use its capital resources sooner than it expects; and other risks described in the Company’s prior press releases and the Company’s filings with the SEC, including under the heading “Risk Factors” in the Company’s annual report on Form 10-K and any subsequent filings with the SEC. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and Gossamer undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement, which is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260821107693/en/

SAN DIEGO--(BUSINESS WIRE)---- $GOSS--Gossamer Bio, Inc. (Nasdaq: GOSS) (the “Company” or “Gossamer”), a clinical-stage biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with interstitial lung disease (PH-ILD), today announced its financial results for the second quarter ended June 30, 2026, and provided a business update. “We have worked hard to strengthen Gossamer and.

, /PRNewswire/ -- Kuehn Law, PLLC, a shareholder litigation law firm, is investigating whether certain officers and directors of Gossamer Bio, Inc. (NASDAQ: GOSS) breached their fiduciary duties to shareholders. 

According to a federal securities lawsuit, Gossamer Bio misrepresented or failed to disclose material information regarding its Phase 3 PROSERA study evaluating seralutinib for the treatment of pulmonary arterial hypertension (PAH). Specifically, the lawsuit alleges that Defendants failed to disclose material issues with the study's design, including the Company's inability to adequately control for the placebo response at its Latin American clinical trial sites. As a result, Gossamer's public statements allegedly overstated the strength of the PROSERA trial design, causing investors to purchase the Company's securities at artificially inflated prices.

If you currently own GOSS and purchased prior to June 16, 2025 please contact Sophia Anne Silayan by email at [email protected] or call (833) 672-0814.  Kuehn Law pays all case costs and does not charge its investor clients. Shareholders should contact the firm immediately as there may be limited time to enforce your rights. 

Why Your Participation Matters:

As a shareholder your voice matters, and by getting involved, you contribute to the integrity and fairness of the financial markets. Your investment. Your voice. Your future.™ 

For additional information, please visit Shareholder Derivative Litigation - Kuehn Law.

Attorney advertising. Prior results do not guarantee similar outcomes.

Contacts:
Kuehn Law, PLLC
Justin Kuehn, Esq.
53 Hill Street, Suite 605
Southampton, NY 11968
[email protected]
(833) 672-0814

SOURCE Kuehn Law, PLLC

The clinical-stage biopharmaceutical company announced the timeline alongside major corporate updates, including regaining full global commercial rights to the candidate and completing significant balance sheet restructuring.

FDA Alignment And Regulatory RoadmapDuring the mid-June 2026 meeting, the FDA characterized the treatment effect and statistical significance observed in the Phase 3 PROSERA study as review issues rather than filing hurdles.

Gossamer Bio plans to support its NDA submission using the Phase 3 trial alongside confirmatory data from its Phase 2 TORREY study and supportive analyses.

Should the FDA accept the filing, an approval decision for the pulmonary arterial hypertension (PAH) treatment could occur in the third quarter of 2027.

Full Global Rights Reacquired From ChiesiGossamer Bio and Chiesi agreed to end their collaboration, giving Gossamer Bio complete operational control over development, pricing, manufacturing, and commercialization across all geographic markets.

Under the termination terms, Chiesi will make a one-time $5 million payment to Gossamer Bio to settle existing and future obligations, including second-quarter 2026 costs.

Gossamer Bio made no upfront cash payment to reclaim the rights, but Chiesi will receive capped royalties on global net sales and specified milestone payments.

Debt Reduction And Financial Balance Sheet UpdatesStockholders approved proposals at a special meeting related to exchanging 5.00% Convertible Senior Notes due 2027.

The transaction reduced the aggregate debt principal by approximately $115.9 million, bringing the remaining 2027 note balance down to $18.9 million. Shareholders also authorized a reverse stock split to support Nasdaq minimum bid price compliance.

As of June 30, 2026, the company held preliminary cash, cash equivalents, and marketable securities of about $57 million.

GOSS Price Action: Gossamer Bio shares were up 44.04% at $0.19 at the time of publication on Monday. The stock is trading near its 52-week low of $0.11, according to Benzinga Pro data.

Photo: Billion Photos / Shutterstock

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SAN DIEGO--(BUSINESS WIRE)--Gossamer Bio, Inc. (NASDAQ: GOSS) (the “Company” or “Gossamer”), a biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with interstitial lung disease (PH-ILD), today announced that the initial conversion rate for its 7.50% Convertible Senior Secured First Lien Notes due 2030 (the “2030 Convertible Notes”) will be 5,347.5936 shares of t.

NEW YORK, May 30, 2026 (GLOBE NEWSWIRE) --

WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Gossamer Bio, Inc. (NASDAQ: GOSS) between June 16, 2025 and February 20, 2026, inclusive (the “Class Period”), of the important June 1, 2026 lead plaintiff deadline.

SO WHAT: If you purchased Gossamer securities during the Class Period you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement.

WHAT TO DO NEXT: To join the Gossamer class action, go to https://rosenlegal.com/submit-form/?case_id=61894 or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action. A class action lawsuit has already been filed. If you wish to serve as lead plaintiff, you must move the Court no later than June 1, 2026. A lead plaintiff is a representative party acting on behalf of other class members in directing the litigation.

WHY ROSEN LAW: We encourage investors to select qualified counsel with a track record of success in leadership roles. Often, firms issuing notices do not have comparable experience, resources, or any meaningful peer recognition. Many of these firms do not actually handle securities class actions, but are merely middlemen that refer clients or partner with law firms that actually litigate the cases. Be wise in selecting counsel. The Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation. Rosen Law Firm has achieved, at that time, the largest ever securities class action settlement against a Chinese Company. Rosen Law Firm was Ranked No. 1 by ISS Securities Class Action Services for number of securities class action settlements in 2017. The firm has been ranked in the top 4 each year since 2013 and has recovered hundreds of millions of dollars for investors. In 2019 alone the firm secured over $438 million for investors. In 2020, founding partner Laurence Rosen was named by law360 as a Titan of Plaintiffs’ Bar. Many of the firm’s attorneys have been recognized by Lawdragon and Super Lawyers.

DETAILS OF THE CASE: According to the lawsuit, defendants provided overwhelmingly positive statements to investors while, at the same time, disseminating false and misleading statements and/or concealing material adverse facts concerning the study design for Gossamer’s Phase 3 PROSERA study, particularly, controlling for the placebo response at the Latin American testing sites. When the true details entered the market, the lawsuit claims that investors suffered damages.

To join the Gossamer class action, go to https://rosenlegal.com/submit-form/?case_id=61894 or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action.

No Class Has Been Certified. Until a class is certified, you are not represented by counsel unless you retain one. You may select counsel of your choice. You may also remain an absent class member and do nothing at this point. An investor’s ability to share in any potential future recovery is not dependent upon serving as lead plaintiff.

Follow us for updates on LinkedIn: https://www.linkedin.com/company/the-rosen-law-firm, on Twitter: https://twitter.com/rosen_firm or on Facebook: https://www.facebook.com/rosenlawfirm/.

Attorney Advertising. Prior results do not guarantee a similar outcome.

-------------------------------

Contact Information:

        Laurence Rosen, Esq.
        Phillip Kim, Esq.
        The Rosen Law Firm, P.A.
        275 Madison Avenue, 40th Floor
        New York, NY 10016
        Tel: (212) 686-1060
        Toll Free: (866) 767-3653
        Fax: (212) 202-3827
        [email protected]
        www.rosenlegal.com

New York, New York--(Newsfile Corp. - May 31, 2026) - WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Gossamer Bio, Inc. (NASDAQ: GOSS) between June 16, 2025 and February 20, 2026, inclusive (the "Class Period"), of the important June 1, 2026 lead plaintiff deadline.

SO WHAT: If you purchased Gossamer securities during the Class Period you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement.

WHAT TO DO NEXT: To join the Gossamer class action, go to https://rosenlegal.com/submit-form/?case_id=61894 or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action. A class action lawsuit has already been filed. If you wish to serve as lead plaintiff, you must move the Court no later than June 1, 2026. A lead plaintiff is a representative party acting on behalf of other class members in directing the litigation.

WHY ROSEN LAW: We encourage investors to select qualified counsel with a track record of success in leadership roles. Often, firms issuing notices do not have comparable experience, resources, or any meaningful peer recognition. Many of these firms do not actually handle securities class actions, but are merely middlemen that refer clients or partner with law firms that actually litigate the cases. Be wise in selecting counsel. The Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation. Rosen Law Firm has achieved, at that time, the largest ever securities class action settlement against a Chinese Company. Rosen Law Firm was Ranked No. 1 by ISS Securities Class Action Services for number of securities class action settlements in 2017. The firm has been ranked in the top 4 each year since 2013 and has recovered hundreds of millions of dollars for investors. In 2019 alone the firm secured over $438 million for investors. In 2020, founding partner Laurence Rosen was named by law360 as a Titan of Plaintiffs' Bar. Many of the firm's attorneys have been recognized by Lawdragon and Super Lawyers.

DETAILS OF THE CASE: According to the lawsuit, defendants provided overwhelmingly positive statements to investors while, at the same time, disseminating false and misleading statements and/or concealing material adverse facts concerning the study design for Gossamer's Phase 3 PROSERA study, particularly, controlling for the placebo response at the Latin American testing sites. When the true details entered the market, the lawsuit claims that investors suffered damages.

To join the Gossamer class action, go to https://rosenlegal.com/submit-form/?case_id=61894 or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action.

No Class Has Been Certified. Until a class is certified, you are not represented by counsel unless you retain one. You may select counsel of your choice. You may also remain an absent class member and do nothing at this point. An investor's ability to share in any potential future recovery is not dependent upon serving as lead plaintiff.

Follow us for updates on LinkedIn: https://www.linkedin.com/company/the-rosen-law-firm, on Twitter: https://twitter.com/rosen_firm or on Facebook: https://www.facebook.com/rosenlawfirm/.

Attorney Advertising. Prior results do not guarantee a similar outcome.

-------------------------------

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/299388

Source: The Rosen Law Firm PA

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LOS ANGELES, May 31, 2026 (GLOBE NEWSWIRE) -- The Schall Law Firm, a national shareholder rights litigation firm, reminds investors of a class action lawsuit against Gossamer Bio, Inc. (“Gossamer” or “the Company”) (NASDAQ: GOSS) for violations of §§10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by the U.S. Securities and Exchange Commission.

Investors who purchased the Company’s securities between June 16, 2025 and February 20, 2026, inclusive (the “Class Period”), are encouraged to contact the firm before June 1, 2026.

If you are a shareholder who suffered a loss, click here to participate.

We also encourage you to contact Brian Schall of the Schall Law Firm, 2049 Century Park East, Suite 2460, Los Angeles, CA 90067, at 310-301-3335, to discuss your rights free of charge. You can also reach us through the firm's website at www.schallfirm.com, or by email at [email protected].

The class, in this case, has not yet been certified, and until certification occurs, you are not represented by an attorney. If you choose to take no action, you can remain an absent class member.

According to the Complaint, the Company made false and misleading statements to the market. Gossamer concealed adverse facts about the design of its Phase 3 PROSERA study, especially regarding controls for placebo response at certain testing sites. Based on these facts, the Company’s public statements were false and materially misleading throughout the class period. When the market learned the truth about Gossamer, investors suffered damages.

Join the case to recover your losses

The Schall Law Firm represents investors around the world and specializes in securities class action lawsuits and shareholder rights litigation.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and rules of ethics.        

CONTACT:

The Schall Law Firm
Brian Schall, Esq.,
www.schallfirm.com
Office: 310-301-3335
[email protected]

SOURCE:

 The Schall Law Firm

Gossamer Bio, Inc. Sued for Securities Law Violations - Contact the DJS Law Group to Discuss Your Rights - GOSS PR Newswire

LOS ANGELES, June 1, 2026

, /PRNewswire/ -- The DJS Law Group reminds investors of a class action lawsuit against Gossamer Bio, Inc. ("Gossamer" or "the Company") (NASDAQ: GOSS) violations of §§10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by the U.S. Securities and Exchange Commission.

Shareholders who purchased shares of GOSS during the class period listed are encouraged to contact the firm regarding possible lead plaintiff appointments. Appointment as lead plaintiff is not required to partake in any recovery.

CLASS PERIOD: June 16, 2025 to February 20, 2026
DEADLINE: June 1, 2026

CASE DETAILS: According to the Complaint, the Company made false and misleading statements to the market. Gossamer misled investors by concealing facts about issues with its Phase 3 PROSERA study. Based on these facts, Gossamer's public statements were false and materially misleading throughout the class period.

If you are a shareholder who suffered a loss, contact us to participate.

WHY DJS LAW GROUP? DJS Law Group's primary focus is to enhance investor return through balanced counseling and aggressive advocacy. We specialize in securities class actions, corporate governance litigation, and domestic/international M&A appraisals. Our clients are some of the largest and most sophisticated hedge funds and alternative asset managers in the world. The litigation claims of our clients are extraordinarily valuable assets that demand respect, focus, and results.

Join the case to recover your losses.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and rules of ethics.

CONTACT:
David J. Schwartz
DJS Law Group
274 White Plains Road, Suite 1
Eastchester, NY 10709
Phone: 914-206-9742
Email: [email protected]

View original content:https://www.prnewswire.com/news-releases/gossamer-bio-inc-sued-for-securities-law-violations---contact-the-djs-law-group-to-discuss-your-rights--goss-302786661.html

SOURCE DJS Law Group LLP

, /PRNewswire/ -- A securities class action lawsuit has been filed against Gossamer Bio, Inc. (NASDAQ: GOSS) and an executive, seeking to represent investors who purchased or otherwise acquired Gossamer securities between June 16, 2025 and February 20, 2026.

The lawsuit follows Gossamer's bombshell announcement on February 23, 2026 that top-line results for its Phase 3 PROSERA study did not meet the primary endpoint (the change from baseline in six-minute-walk distance at week 24). The study evaluated seralutinib for the treatment of pulmonary arterial hypertension ("PAH").

The developments, including the trial failure and 80% stock drop, prompted national shareholder rights firm Hagens Berman to commence an investigation into the alleged pending claims that Gossamer violated federal securities laws. The firm encourages Gossamer investors who suffered substantial losses on Class Period GOSS investments to submit your losses now.

The firm also encourages persons with knowledge who may be able to assist the investigation to contact its attorneys.

View our latest video summary of the allegations: youtu.be/TOr_OsDdBXY

Class Period: June 16, 2025 – Feb. 20, 2026
Lead Plaintiff Deadline: June 1, 2026
Visit: www.hbsslaw.com/investor-fraud/goss
Contact the Firm Now: [email protected]
844-916-0895

Gossamer Bio, Inc. (GOSS) Securities Class Action:

The litigation is focused on the propriety of Gossamer's disclosures about the Phase 3 PROSERA trial design, including its patient recruitment protocol and site-level monitoring.

In the past, Gossamer has emphasized that serlutinib is a "potential first-in-class therapeutic[,]" which "represents the possibility of a multi-billion-dollar opportunity across multiple indications[.]"

As recently as mid-November 2025, the company's management cited the highly successful Merck Phase 3 STELLAR study of sotatercept for treating PAH. Gossamer's management said, "if you look at their data, the best performing region was Latin America, and we have actually more patients coming from those same geographies and same sites." Management also assured investors that "we have gone to the places where precedent studies have shown the greatest amount of efficacy, as well as having an entry criteria that is ensuring that we have patients who, we believe, will really show an improvement based upon, again background disease at week 24."

The complaint alleges that, unknown to investors, Gossamer knew of or recklessly disregarded the trial design issues with the Phase 3 PROSERA study and, instead, crafted a narrative assuring investors that it would meet its primary endpoint. Also unknown to investors, patients at the study's Latin America sites were largely heavily-treated and performing particularly well on placebo.

Investors' expectations were dashed on February 23, 2026. That day, Gossamer announced that PROSERA did not meet its primary endpoint and therefore efficacy was not statistically significant.

Management said during the conference call that day, "[t]he overall treatment effect and statistical parameters were materially diluted by an outsize placebo response and meaningful regional heterogeneity, which compressed the pool placebo-adjusted difference." More specifically, management revealed that in "Latin America, outsized placebo improvements materially compressed the pool treatment difference."

The market swiftly reacted, sending the price of Gossamer shares down by 80%.

After the Class Period, on April 9, 2026, the company revealed that since February 24, 2026 it has not met the minimum share bid price ($1) required for continued listing on the Nasdaq Global Select Market.

"We're focused on whether Gossamer may have misled investors about the PROSERA trial design, including patient entry criteria, as alleged in the pending lawsuit," said Reed Kathrein, the Hagens Berman partner leading the firm's investigation.

If you invested in Gossamer Bio and have substantial losses, or have knowledge that will assist the firm's investigation, submit your losses now.

If you'd like more information and answers to additional frequently asked questions about the Gossamer case and the firm's investigation, read more »

Whistleblowers: Persons with non-public information regarding Gossamer Bio should consider their options to help in the investigation or take advantage of the SEC Whistleblower program. Under the new program, whistleblowers who provide original information may receive rewards totaling up to 30 percent of any successful recovery made by the SEC. For more information, call Reed Kathrein at 844-916-0895 or email [email protected].

About Hagens Berman
Hagens Berman is a global plaintiffs' rights complex litigation firm focusing on corporate accountability. The firm is home to a robust practice and represents investors as well as whistleblowers, workers, consumers and others in cases achieving real results for those harmed by corporate negligence and other wrongdoings. Hagens Berman's team has secured more than $2.9 billion in this area of law. More about the firm and its successes can be found at hbsslaw.com. Follow the firm for updates and news at @ClassActionLaw.

View original content to download multimedia:https://www.prnewswire.com/news-releases/goss-deadline-alert-hagens-berman-alerts-gossamer-bio-goss-investors-to-todays-lead-plaintiff-deadline-in-securities-class-action-302786572.html

SOURCE Hagens Berman Sobol Shapiro LLP

LOS ANGELES--(BUSINESS WIRE)---- $GOSS--GOSS Investors Have Opportunity to Lead Gossamer Bio, Inc. Securities Fraud Lawsuit with the Schall Law Firm.

NEW YORK, June 01, 2026 (GLOBE NEWSWIRE) -- Bronstein, Gewirtz & Grossman, LLC, a nationally recognized investor-rights law firm, announces that a class action lawsuit has been filed against Gossamer Bio, Inc. (NASDAQ: GOSS) and certain of its officers.

This lawsuit seeks to recover damages against Defendants for alleged violations of the federal securities laws on behalf of all persons and entities that purchased or otherwise acquired Gossamer securities between June 16, 2025 and February 20, 2026, both dates inclusive (the “Class Period”). Such investors are encouraged to join this case by visiting the firm’s site: bgandg.com/GOSS.

Gossamer Case Details

The Complaint alleges that, throughout the Class Period, Defendants made materially false and misleading statements and/or failed to disclose that:

while publicly touting overwhelmingly positive results to investors, Defendants concealed material adverse facts regarding the design of the Company’s Phase 3 PROSERA study, including their failure to adequately control for placebo response at the Latin American testing sites; and 
as a result of the foregoing, Gossamer’s securities traded at artificially inflated prices, causing Plaintiff and other Class members to purchase shares at inflated levels. What's Next for Gossamer Investors?

A class action lawsuit has already been filed. If you wish to review a copy of the Complaint, you can visit the firm’s site: bgandg.com/GOSS. or you may contact Peretz Bronstein, Esq. or his Client Relations Manager, Nathan Miller, of Bronstein, Gewirtz & Grossman, LLC at 917-590-0911. If you suffered a loss in Gossamer you have until June 1, 2026, to request that the Court appoint you as lead plaintiff. Your ability to share in any recovery doesn't require that you serve as lead plaintiff.

No Cost to Gossamer Investors

We, Bronstein, Gewirtz & Grossman LLC, represent investors in class actions on a contingency fee basis. That means we will ask the court to reimburse us for out-of-pocket expenses and attorneys’ fees, usually a percentage of the total recovery, only if we are successful.

Why Bronstein, Gewirtz & Grossman, LLC for Gossamer Securities Class Action?

Bronstein, Gewirtz & Grossman, LLC is a nationally recognized firm that represents investors in securities fraud class actions and shareholder derivative suits. Our firm has recovered hundreds of millions of dollars for investors nationwide. More at www.bgandg.com

"Our practice centers on restoring investor capital and ensuring corporate accountability, which serves to uphold the essential integrity of the marketplace," said Peretz Bronstein, Founding Partner of Bronstein, Gewirtz & Grossman, LLC.

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Contact Info

Peretz Bronstein, Esq. or Nathan Miller
Bronstein, Gewirtz & Grossman, LLC
917-590-0911 | [email protected]

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NEW YORK--(BUSINESS WIRE)---- $GOSS #Bio--Faruqi & Faruqi, LLP, a leading national securities law firm, is investigating potential claims against Gossamer Bio, Inc. (“Gossamer” or the “Company”) (NASDAQ: GOSS) and reminds investors of the June 1, 2026 deadline to seek the role of lead plaintiff in a federal securities class action that has been filed against the Company.Faruqi & Faruqi is a leading national securities law firm with offices in New York, Pennsylvania, California and Georgia. The firm has.

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