Summary
Updated Aug 31, 2026
Sandra Milligan is Director of Gossamer Bio, Inc. (GOSS). 5 SEC Form 4 filings on record going back to 2024, most recently on 5 June 2026. Most recent open-market trade: bought $50K of GOSS on 20 August 2025. Lifetime open-market purchases: $50K.
Recent Transactions
1Every recent SEC Form 4 transaction Sandra Milligan has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Sandra Milligan go back to 2024: 5 primary Form 4 filings, an average of 1.7 per year. The typical open-market purchase is $50K (1 buy totaling $50K). The largest single buy on record is $50K of GOSS in 2025. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Sector
No other insider has filed at Sandra Milligan's companies, so these are insiders reporting open-market trades at other companies in the same sector.
- Bain Capital Life Sciences Investors, LLC - $115.00M of HTFL open-market activity in the last 12 months
- Herriot Tabuteau - $110.58M of AXSM open-market activity in the last 12 months
- Mayukh Sukhatme - $109.13M of ROIV open-market activity in the last 12 months
- Michael Simanovsky - $105.88M of SNDA open-market activity in the last 12 months
- Eric Venker - $103.97M of ROIV open-market activity in the last 12 months
- Bruce Booth - $100.59M of KYMR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Sandra Milligan?
Sandra Milligan is a corporate insider, tracked as Director of Gossamer Bio, Inc. (GOSS). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Sandra Milligan submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Sandra Milligan been buying or selling stock?
Recorded transactions: 1 open-market purchase ($50K) and 0 open-market sales across all tracked filings.
Where can I see all of Sandra Milligan's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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