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GOSS

Gossamer Bio, Inc.
GOSS stock: dilution, delisting risk, reverse split — what the SEC filings say, updated every weekday morning.
Nasdaq · Pharmaceutical Preparations · EDGAR filings (CIK 1728117) · 17 signals · 2 setups · updated Sep 22, 2026

What the filings say Pressure ▼

The filings point to a discounted equity raise ahead — dilution for existing holders. Next thing to watch: a 424B or offering 8-K.

Radar 85 (high attention) · dilution pressure high · listing risk high · governance risk elevated · runway 4.3 mo · strongest signal: Minimum bid deficiency (Sep 11, 2026)

What would confirm: 424B5/8-K announcing an offering, ATM sales disclosed in next 10-Q, or Form 4 sales by insiders ahead of it.
What would prove it wrong: Non-dilutive cash event (asset sale, grant, milestone payment), OCF turning positive, or shelf withdrawn (RW).

Direction is stated for existing shareholders (▼ more shares / survival or listing risk; ▲ insiders or holders buying). It is a characterization of the filings, not a forecast or a recommendation.

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85Radar · attention score (0–100)
77Dilution pressure · financing + balance sheet
84Listing risk · exchange standards
44Governance risk · reporting, auditor, going concern

Setups

Independent filings stitched into a thesis, each with what would confirm and what would prove it wrong.

Forced-raise setup Pressure ▼ strength 0.85

The filings point to a discounted equity raise ahead — dilution for existing holders. Next thing to watch: a 424B or offering 8-K. Cash need (negative equity, runway < 6 months) coexists with live selling machinery (pipe). Base case is a discounted raise; the question is when, not if.

Would confirm: 424B5/8-K announcing an offering, ATM sales disclosed in next 10-Q, or Form 4 sales by insiders ahead of it.
Would invalidate: Non-dilutive cash event (asset sale, grant, milestone payment), OCF turning positive, or shelf withdrawn (RW).
Negative equityPIPERunway < 6 months

Listing cliff Pressure ▼ strength 0.60

Listing is at risk and the usual cures are constrained. Next thing to watch: a reverse-split proxy, a hearings-panel 8-K, or a Form 25. Exchange deficiency plus a structural reason cure is hard (sub-$5M float, negative equity, no cash, or a reverse split already used). Under Nasdaq's 2026 rules (one reverse split per 12 months; $5M MVLS floor with no cure period from Sept 2026) the usual escape hatches are narrower.

Would confirm: Nasdaq 'Pending Suspension' listing, Form 25, hearings-panel denial 8-K, or a reverse-split proxy.
Would invalidate: 8-K announcing regained compliance; equity raise that restores stockholders' equity; MVLS back above threshold for 10+ days.
Minimum bid deficiencyNegative equityReverse splitRunway < 6 months

Analyst note

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12-month history
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Balance sheet (XBRL)

$41.1Mcash + short-term investments as of Jun 30, 2026
4.3 moestimated runway (annualized 180-day YTD operating cash flow [companyfacts])
$-94.0Mstockholders' equity as of Jun 30, 2026
$270.8Mpublic float (10-K cover)
488.8Mshares outstanding as of Aug 8, 2026 · was 234.7M May 12, 2026

Runway = liquidity ÷ monthly operating burn at the latest reported period · balance sheet 84 days old. A financing after the balance-sheet date is the main reason a figure can be stale — check the timeline below for offerings since then.

Signal timeline

Last 30 days of filing signals plus current balance-sheet flags, newest first. ▼ pressure · ▲ support · hover a score for its components; every row links to the filing.

DateSignalEvidenceScore
Sep 16, 2026▼ Reverse split “reverse split” language in 8-K (8-K) filed 2026-09-16 filing 35
Sep 16, 2026▼ PIPE “pipe” language in 8-K (8-K) filed 2026-09-16 filing 33
Sep 16, 2026▼ Reverse split “reverse split” language in DEF 14A (DEF 14A) filed 2026-09-16 filing 30
Sep 16, 2026· Officer/director change 8-K Item 5.02 filed 2026-09-16 (accepted 12:05 ET) filing 23
Sep 11, 2026▼ Minimum bid deficiency “min bid” language in 8-K (EX-99.1) filed 2026-09-11 filing 42
Sep 11, 2026▼ Reverse split “reverse split” language in 8-K (EX-99.1) filed 2026-09-11 filing 40
Sep 11, 2026▼ Holder rights modified 8-K Item 3.03 filed 2026-09-11 (accepted 08:01 ET) filing 31
Sep 9, 2026▼ Minimum bid deficiency “min bid” language in 8-K (EX-99.1) filed 2026-09-09 filing 42
Sep 9, 2026▼ Reverse split “reverse split” language in 8-K (EX-99.1) filed 2026-09-09 filing 35
Aug 26, 2026▼ Reverse split “reverse split” language in 8-K (EX-3.1) filed 2026-08-26 filing 40
Aug 26, 2026▼ PIPE “pipe” language in 8-K (EX-3.1) filed 2026-08-26 filing 33
Aug 26, 2026· Form 4 burst 5 Form 4 filings in 30 days filing 15
Aug 24, 2026· 13D amendment Schedule 13D/A filed 2026-08-24 filing 24
Jun 30, 2026▼ Share count +25% Shares outstanding 234,696,281 (2026-05-12) -> 488,846,722 (2026-08-08), +108% filing 40
Jun 30, 2026▼ Runway < 6 months ~4.3 months runway: liquidity $57,026,000 (cash $41,148,000 + investments $15,878,000) as of 2026-06-30, burn $158,460,694/yr (annualized 180-day YTD operating cash flow [companyfacts]) filing 36
Jun 30, 2026▼ Negative equity Stockholders' equity $-94,029,000 as of 2026-06-30 filing 31
Jun 30, 2026▼ Cash < current liabilities Liquidity $57,026,000 vs current liabilities $137,783,000 filing 22

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