Public ownership evidence

Gossamer Bio, Inc. Common Stock (GOSS) Ownership Disclosures

Read GOSS insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Gossamer Bio, Inc. Common Stock: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-09-25
Trade date
2026-09-23
Reporting owners
Milligan Sandra
Code
A
Shares
10,000
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001628280-26-063624
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read GOSS fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read GOSS fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity
2026-09-252026-09-23Milligan SandraA10,000Not reported
2026-09-252026-09-23Daniel Thomas OA10,000Not reported
2026-09-252026-09-23Ciongoli Gregory AustinA30,000Not reported
2026-09-252026-09-23Drynan SkyeA10,000Not reported
2026-09-252026-09-23Quisel John DA10,000Not reported
2026-09-252026-09-23Cox Russell J.A10,000Not reported
2026-09-252026-09-23Nathan Steven DA10,000Not reported
2026-08-272026-08-24Smith Robert Paul JRA5,800,051Not reported
2026-08-272026-08-24Peterson CarynA5,800,051Not reported
2026-08-272026-08-24Giraudo BryanA5,800,051Not reported
2026-08-272026-08-24Giraudo BryanA25Not reported
2026-08-272026-08-24Christian WaageA2,900,026Not reported
2026-08-272026-08-24Hasnain FaheemA5,800,051Not reported
2026-08-272026-08-24Hasnain FaheemA166Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Cornerstone Financial Management LLC2026-03-312026-08-29282$93None
Cornerstone Financial Management LLC2025-12-312026-08-29282$874None
Corient Private Wealth LP2026-06-302026-08-285,632,698$927,142None
Kalehua Capital Management LLC2026-06-302026-08-2011,149,363$1,835,185None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-20297,863$49,028None
Beacon Pointe Advisors, LLC2026-06-302026-08-1948,000$7,901None
Ensign Peak Advisors, Inc2026-03-312026-08-191,702,125$559,148None
Corient Private Wealth LP2026-06-302026-08-185,625,509$925,959None
Ishara Investments LP2026-06-302026-08-15820,000$134,972None
Kalehua Capital Management LLC2026-06-302026-08-1511,149,363$1,835,185None
Federation des caisses Desjardins du Quebec2026-06-302026-08-157,750$1,279None
Basecamp Wealth Advisors LLC2026-06-302026-08-151,359$224None
Quarry LP2026-06-302026-08-15100,000$16,460None
ADAR1 Capital Management, LLC2026-06-302026-08-15212,531$34,983None
Vickerman Investment Advisors, Inc.2026-06-302026-08-1534,787$5,726None
Caerus Investment Advisors, LLC2026-06-302026-08-1513,797$2,271None
Velan Capital Investment Management LP2026-06-302026-08-1570,000$11,522None
Octagon Capital Advisors LP2026-06-302026-08-157,750,000$1,275,650None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15992,527$163,370None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15992,527$163,370None
SAMSARA BIOCAPITAL, LLC2026-06-302026-08-157,222,559$1,188,833None
Qube Research & Technologies Ltd2026-06-302026-08-157,065,756$1,163,023None
OSAIC HOLDINGS, INC.2026-06-302026-08-15120,204$19,232None
Schonfeld Strategic Advisors LLC2026-06-302026-08-15132,888$21,871None
Squarepoint Ops LLC2026-06-302026-08-152,556,378$420,780None
Birchview Capital, LP2026-06-302026-08-1518,176$2,992None
JANE STREET GROUP, LLC2026-06-302026-08-15135,000$22,221Call
Heritage Wealth Advisors2026-06-302026-08-151,000$165None
EVENTIDE ASSET MANAGEMENT, LLC2026-06-302026-08-15163,440$26,804None
Ensign Peak Advisors, Inc2026-06-302026-08-151,450,979$238,831None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-151,171,800$187,488Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1536,000$5,760Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15383,049$63,050None
DeepCurrents Investment Group LLC2026-06-302026-08-1510,018,934$1,603,029None
DeepCurrents Investment Group LLC2026-06-302026-08-1527,646,139$4,423,382None
683 Capital Management, LLC2026-06-302026-08-1539,198,868$6,452,134None
Waverly Advisors, LLC2026-06-302026-08-1510,773$1,773None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-152,402,633$395,473None
Skaana Management L.P.2026-06-302026-08-1540,200$6,617None
Balyasny Asset Management L.P.2026-06-302026-08-15104,232$17,157None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-154,500$707None
Alyeska Investment Group, L.P.2026-06-302026-08-152,051,442$337,667None
MAI Capital Management2026-06-302026-08-1516,540$2,723None
MAI Capital Management2026-06-302026-08-154,257$701None
Curi Capital, LLC2026-06-302026-08-1539,784$6,549None
Volterra Technologies LP2026-06-302026-08-1511,400$1,876Call
Cerity Partners LLC2026-06-302026-08-1549,346$8,123None
Cerity Partners LLC2026-06-302026-08-1564,475$10,613None
Cerity Partners LLC2026-06-302026-08-1546,578$7,668None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-154,750$782None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Corient Private Wealth LP ↗Kalehua Capital Management LLC ↗MERCER GLOBAL ADVISORS INC /ADV ↗Beacon Pointe Advisors, LLC ↗Ensign Peak Advisors, Inc ↗Corient Private Wealth LP ↗Ishara Investments LP ↗Kalehua Capital Management LLC ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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