GOSS SCHEDULE 13D/A: Insider sale planned
Filed with the SEC on · accession 0001104659-26-111463
GOSS filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Sep 28, 2026. A report the company filed with the SEC (the US market regulator). The stock moved +5.3% by the first close after the filing.
Summary of the filing
Two reporting entities, Cogence and Valence, sold a large number of Gossamer Bio common shares between August 25 and September 28, 2026, with sales initially at sub-$0.20 prices and later at prices above $10 per share.
Key details
How GOSS stock reacted
Close before
$10.94
Sep 25, 2026
First close after
+5.30%
$11.52
5 trading days
-2.10%
$10.71
Since filing
-10.69%
$9.77
✦ Ask GOAX AI about this filing — what it means for GOSS, what changed since its last filings and what to watch next.
Try it free for 7 days🔔 Want to stay updated on new SEC filings for GOSS?
Click hereFrequently asked questions
What did GOSS file with the SEC on Sep 28, 2026?
GOSS filed a SCHEDULE 13D/A (Insider sale planned). Two reporting entities, Cogence and Valence, sold a large number of Gossamer Bio common shares between August 25 and September 28, 2026, with sales initially at sub-$0.20 prices and later at prices above $10 per share.
How do I read a SCHEDULE 13D/A?
A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.
Why are SEC filings important?
Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).
How did GOSS stock react to this filing?
GOSS closed at $10.94 before the filing and $11.52 on Sep 28, 2026 (+5.30%). Five trading days later: $10.71 (-2.10%).
Other GOSS SEC filings
- SCHEDULE 13G · SEC filingNov 6, 2026
- SCHEDULE 13G/A · SEC filingNov 6, 2026
- SCHEDULE 13D/A · Insider sale plannedOct 29, 2026
- 8-K · SEC filingOct 28, 2026
- SCHEDULE 13D/A · Insider sale plannedOct 8, 2026
- 8-K · Delisting noticeSep 28, 2026
- 8-K · Fda approvalSep 23, 2026
- DEF 14A · Board changeSep 16, 2026
- 8-K · Board changeSep 16, 2026
- 8-K · Stock splitSep 11, 2026
Get alerts when GOSS files with the SEC, plus live charts, key levels and news for 13,000+ stocks.
Try SEPT free for 7 days