683 Capital Management Amends Gossamer Bio Stake

TL;DR

**683 Capital Management just updated their ownership in Gossamer Bio.**

AI Summary

683 Capital Management, LLC filed a Schedule 13G/A on March 24, 2026, indicating an update to their beneficial ownership in Gossamer Bio, Inc. This filing is an amendment, meaning 683 Capital Management, LLC previously reported ownership and is now updating that information. For investors, this matters because significant changes in institutional ownership can signal confidence or concern in the company's future, potentially influencing stock price movements.

Why It Matters

This filing updates the public record on how much of Gossamer Bio, Inc. is owned by 683 Capital Management, LLC, which can influence investor sentiment and stock valuation.

Risk Assessment

Risk Level: low — This is a routine disclosure of ownership, not indicating any immediate financial distress or major operational changes.

Analyst Insight

An investor should monitor subsequent 13G/A filings from 683 Capital Management, LLC to track changes in their ownership percentage, as significant increases or decreases could signal their evolving view on Gossamer Bio, Inc.'s prospects.

Key Players & Entities

• 683 Capital Management, LLC (company) — the entity filing the Schedule 13G/A
• Gossamer Bio, Inc. (company) — the subject company in which ownership is being reported
• March 24, 2026 (date) — the filing and acceptance date of the Schedule 13G/A

FAQ

Key Financial Figures

• $0.0001 — o, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of

Filing Documents

• primary_doc.html (SCHEDULE 13G/A)
• primary_doc.xml (SCHEDULE 13G/A) — 9KB
• 0001085146-26-000283.txt ( ) — 10KB

Ownership

Item 4. Ownership (a) Amount beneficially owned: As of March 24, 2026, 683 Capital Partners, LP beneficially owned 5,000,000 shares of Common Stock and warrants to purchase 4,331,304 shares of Common Stock which are currently exercisable. 683 Capital Management, LLC, as the investment manager of 683 Capital Partners, LP, may be deemed to have beneficially owned the 5,000,000 shares of Common Stock and warrants to purchase 4,331,304 shares of Common Stock beneficially owned by 683 Capital Partners, LP. Ari Zweiman, as the Managing Member of 683 Capital Management, LLC, may be deemed to have beneficially owned the 5,000,000 shares of Common Stock and warrants to purchase 4,331,304 shares of Common Stock beneficially owned by 683 Capital Management, LLC. The following percentage is based on 234,696,281 shares of common stock ($0.0001 par value) outstanding as of March 10, 2026, as disclosed in the Issuer's Form 10-K filed on March 17, 2026, plus 4,331,304 shares of Common Stock issuable upon exercise of currently exercisable warrants held by the Reporting Persons. As of March 24, 2026, the Reporting Persons may be deemed to have beneficially owned approximately 3.90% of the outstanding Common Shares. (b) Percent of class: 3.90  % (c) Number of shares as to which the person has:   (i) Sole power to vote or to direct the vote: See Cover Pages Items 5-9.   (ii) Shared power to vote or to direct the vote: See Cover Pages Items 5-9.   (iii) Sole power to dispose or to direct the disposition of: See Cover Pages Items 5-9.   (iv) Shared power to dispose or to direct the disposition of: See Cover Pages Items 5-9.

Ownership of 5 Percent or Less of a Class

Item 5. Ownership of 5 Percent or Less of a Class.      Ownership of 5 percent or less of a class

Ownership of more than 5 Percent on Behalf of Another Person

Item 6. Ownership of more than 5 Percent on Behalf of Another Person.   Not Applicable Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.   Not Applicable

Identification and Classification of Members of the Group

Item 8. Identification and Classification of Members of the Group.   If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. See Exhibit A to Schedule 13G filed on March 2, 2026.

Notice of Dissolution of Group

Item 9. Notice of Dissolution of Group.   Not Applicable

Certifications

Item 10. Certifications:   By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.     SIGNATURE     After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.   683 Capital Management, LLC   Signature: Ari Zweiman Name/Title: Managing Member Date: 03/24/2026   683 Capital Partners, LP   Signature: Ari Zweiman Name/Title: Authorized Person Date: 03/24/2026   Ari Zweiman   Signature: Ari Zweiman Name/Title: Self Date: 03/24/2026

View Full Filing

View this filing on SEC EDGAR