SEC Form 4
Gossamer Bio, Inc. (GOSS) insider trading
No open-market GOSS insider purchases or sales were filed in the 12 months to Oct 26, 2026.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $0
- 0 filings
Who traded GOSS, and when
GOSS daily close from Oct 27, 2025 to Oct 26, 2026, between $8.43 and $303.20, last $9.04. No open-market insider purchases or sales were filed in this period.
No open-market insider purchases or sales were filed in the last 12 months.
Open-market trades
0 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| No open-market purchases or sales in the last 12 months. | ||||||
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
| No open-market purchases or sales in the last 12 months. | |||||||
GET /stocks/filings/vX/form-4?tickers=GOSS&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"GOSS"
],
"issuer_cik": "0001728117",
"owner_cik": "0002023732",
"accession_number": "0001628280-26-063616",
"form_type": "4",
"filing_date": "2026-09-25",
"period_of_report": "2026-09-23",
"issuer_name": "Gossamer Bio, Inc.",
"issuer_trading_symbol": "GOSS",
"owner_name": "Ciongoli Gregory Austin",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "derivative",
"record_type": "transaction",
"security_title": "Stock Option (Right to Buy)",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-23",
"transaction_code": "A",
"equity_swap_involved": false,
"transaction_shares": 30000,
"transaction_price_per_share": 0,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 30000,
"transaction_value": 0,
"exercise_price": 10.99,
"expiration_date": "2036-09-22",
"underlying_security_title": "Common Stock",
"underlying_security_shares": 30000,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "1/36th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Corporation on each such vesting date."
}
]
},
{
"tickers": [
"GOSS"
],
"issuer_cik": "0001728117",
"owner_cik": "0002015102",
"accession_number": "0001628280-26-063610",
"form_type": "4",
"filing_date": "2026-09-25",
"period_of_report": "2026-09-23",
"issuer_name": "Gossamer Bio, Inc.",
"issuer_trading_symbol": "GOSS",
"owner_name": "Drynan Skye",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "derivative",
"record_type": "transaction",
"security_title": "Stock Option (Right to Buy)",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-23",
"transaction_code": "A",
"equity_swap_involved": false,
"transaction_shares": 10000,
"transaction_price_per_share": 0,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 10000,
"transaction_value": 0,
"exercise_price": 10.99,
"expiration_date": "2036-09-22",
"underlying_security_title": "Common Stock",
"underlying_security_shares": 10000,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The entire number of shares subject to this option becomes fully vested and exercisable on the first anniversary of the grant date, subject to the Reporting Person's continued service on the board of directors of the Issuer through such vesting date."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 6 records
- Grants and awards6 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Gossamer Bio, Inc.'s CEO sold stock?
No. Faheem Hasnain (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is GOSS’s insider data?
These are GOSS Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
Build with AI
Track GOSS insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for GOSS every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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