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Gossamer Bio, Inc. SEC filings

Gossamer Bio filed 34 documents with the SEC in the last twelve months, the latest report being the 10-Q of 13 August 2026. The latest filing, on 28 September 2026, was an 8-K: other events.

Filings in twelve months3421 of them 8-K news
Latest report10-Qfiled 13 Aug 2026
Latest filing8-K28 Sep 2026
Last results, two-day move-13.2%results filed 13 Aug 2026
New to this? How to read this page
  1. Companies file with the SEC when something happens. 10-Q and 10-K are the quarterly and annual reports; 8-K is news that cannot wait for the next report.
  2. An 8-K says which items it covers, such as results, a change at the top or a big contract. A foreign company files a 6-K instead.
  3. The results release is usually an 8-K filed the day results come out, before the 10-Q or 10-K.
  4. Every filing links to the original on EDGAR, the SEC's own site.

Twelve months of filings

by kind

Most of the filings were other company news (16). Results came out 5 times.

Each mark is one filing on the day it was filed, in rows by kind. Hover or tap a mark for the form and what it was about.

The share price around each results release

close before to close after

Over the last 5 releases the share price moved 22.1% on average in the two days around results, the most on 27 Jul 2026 (+50.8%).

17 Mar 2026-4.8%$36.48 to $34.73
18 May 2026-41.4%$27.20 to $15.93
27 Jul 2026+50.8%$10.88 to $16.41
13 Aug 2026-13.2%$14.21 to $12.34
Daily closeResults filed

Each ring marks a results filing. The move runs from the last close before the filing to the first close after it, so it covers results released before the open or after the close. Hover the line for any day's close.

What the company told investors on 8-K

21 filings

Gossamer Bio's 21 news filings (8-K) were mostly about other events (8) and regulation FD disclosure (6).

  • Other eventsNews the company chose to file
    8 · latest 28 Sep 2026
  • Regulation FD disclosureMaterial shared with investors, often slides or a presentation
    6 · latest 21 Aug 2026
  • Charter or bylaw amendment, or fiscal year changeThe company's rules or fiscal year changed
    5 · latest 11 Sep 2026
  • Results of operationsThe quarterly results release
    5 · latest 13 Aug 2026
  • Material agreementA large contract or deal was signed
    4 · latest 21 Aug 2026
  • Officer or director changeSomeone joined, left or changed role at the top
    3 · latest 16 Sep 2026
  • Unregistered sale of equityShares sold privately
    2 · latest 21 Aug 2026
  • Termination of a material agreementA large contract ended
    2 · latest 27 Jul 2026
  • Shareholder voteResults of a vote at a shareholder meeting
    2 · latest 15 Jul 2026
  • Change to security holders' rightsShareholders' rights changed
    1 · latest 11 Sep 2026
  • New financial obligationNew debt or a borrowing
    1 · latest 5 Jun 2026
  • Delisting noticeAn exchange notice about a listed security, often a bond or note series
    1 · latest 9 Apr 2026

Each line is one kind of news, with what it means in plain words. Each square is one filing; a filing can carry more than one kind, so the squares can add up to more than the filings. The date opens the latest one on EDGAR.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every filing as a table

    In the last twelve months Gossamer Bio, Inc. filed 34 documents with the SEC of the kinds listed here: 21 current reports (8-K), about 8 other events; 6 regulation FD disclosure; 5 charter or bylaw amendment, or fiscal year change; 5 results of operations; 4 material agreement; 3 proxy statements (DEF 14A), 3 quarterly reports (10-Q), 2 preliminary proxys (PRE 14A), 2 additional proxy materials (DEFA14A), 1 annual report to shareholders (ARS), 1 annual report (10-K). The latest, filed 28 September 2026: 8-K, other events. The 10-K, the 10-Qs and the proxy statement themselves, each with a link to open it, are on the documents page.

    FiledFormWhat it was aboutPeriod or event dateFiling
    28 September 20268-KOther events25 September 2026EDGAR
    23 September 20268-KOther events23 September 2026EDGAR
    16 September 2026DEF 14Aproxy statement27 October 2026EDGAR
    16 September 20268-KOfficer or director change16 September 2026EDGAR
    11 September 20268-KChange to security holders' rights, Charter or bylaw amendment, or fiscal year change, Other events10 September 2026EDGAR
    9 September 20268-KOther events9 September 2026EDGAR
    3 September 2026PRE 14Apreliminary proxy3 September 2026EDGAR
    3 September 20268-KCharter or bylaw amendment, or fiscal year change3 September 2026EDGAR
    26 August 20268-KCharter or bylaw amendment, or fiscal year change24 August 2026EDGAR
    21 August 20268-KMaterial agreement, Unregistered sale of equity, Charter or bylaw amendment, or fiscal year change, Regulation FD disclosure20 August 2026EDGAR
    13 August 20268-KResults of operations13 August 2026EDGAR
    13 August 202610-Qquarterly report30 June 2026EDGAR
    27 July 20268-KMaterial agreement, Termination of a material agreement, Results of operations, Regulation FD disclosure, Other events23 July 2026EDGAR
    15 July 20268-KOfficer or director change, Charter or bylaw amendment, or fiscal year change, Shareholder vote14 July 2026EDGAR
    1 July 20268-KRegulation FD disclosure1 July 2026EDGAR
    17 June 20268-KRegulation FD disclosure17 June 2026EDGAR
    9 June 2026DEF 14Aproxy statement14 July 2026EDGAR
    5 June 20268-KMaterial agreement, Termination of a material agreement, New financial obligation, Unregistered sale of equity, Regulation FD disclosure3 June 2026EDGAR
    5 June 20268-KShareholder vote4 June 2026EDGAR
    2 June 20268-KOther events2 June 2026EDGAR
    18 May 2026PRE 14Apreliminary proxy18 May 2026EDGAR
    18 May 2026DEFA14Aadditional proxy materialEDGAR
    18 May 20268-KMaterial agreement, Results of operations, Officer or director change, Regulation FD disclosure, Other events18 May 2026EDGAR
    15 May 202610-Qquarterly report31 March 2026EDGAR
    24 April 2026ARSannual report to shareholders24 April 2026EDGAR
    24 April 2026DEFA14Aadditional proxy materialEDGAR
    24 April 2026DEF 14Aproxy statement24 April 2026EDGAR
    9 April 20268-KDelisting notice8 April 2026EDGAR
    17 March 20268-KResults of operations17 March 2026EDGAR
    17 March 202610-Kannual report31 December 2025EDGAR
    23 February 20268-KOther events23 February 2026EDGAR
    28 January 2026S-3ASRshelf registrationEDGAR
    5 November 20258-KResults of operations5 November 2025EDGAR
    5 November 202510-Qquarterly report30 September 2025EDGAR
    An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened.
    Read moreForm 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.