Insidervault
LIVE FROM THE DATABASETRANSACTIONS 362,430COMPANIES 5,763LATEST TRADE Oct 16UPDATED Oct 17, 12:31 AM
GOSSCIK 0001728117

Gossamer Bio, Inc.

146 transactions by 13 insiders, from January 2, 2026 to September 23, 2026.

Transactions
14613 insiders
Bought · P
Nonenobody bought on the open market
Sold · S
Nonenobody sold on the open market
Net
+$0net buying

Officers and directors

People inside the company. What they do with their own shares is the reason this data exists.

InsiderTradesPlannedBoughtSold
Caryn PetersonChief27———
Bryan GiraudoCFO26———
Richard ArandaCMO26———
Faheem HasnainCEO24———
Waage ChristianEVP23———
Robert Paul Smith Jr.Chief7———
Sandra MilliganDir2———
Russell J. CoxDir2———
Skye DrynanDir2———
Steven D. NathanDir2———
John D. QuiselDir2———
Thomas O. DanielDir2———
Gregory Austin CiongoliDir1———

All transactions

146 in total, newest filings first.

InsiderDateCodeSharesPriceValue
Sandra MilliganDirDERIVSep 23A10,000$0.00—?
Thomas O. DanielDirDERIVSep 23A10,000$0.00—?
Gregory Austin CiongoliDirDERIVSep 23A30,000$0.00—?
Skye DrynanDirDERIVSep 23A10,000$0.00—?
John D. QuiselDirDERIVSep 23A10,000$0.00—?
Russell J. CoxDirDERIVSep 23A10,000$0.00—?
Steven D. NathanDirDERIVSep 23A10,000$0.00—?
Robert Paul Smith Jr.ChiefDERIVAug 24A5,800,051$0.00—?
Caryn PetersonChiefDERIVAug 24A5,800,051$0.00—?
Faheem HasnainCEODERIVAug 24A5,800,051$0.00—?
Faheem HasnainCEODERIVAug 24A166$1,000.00$166K?
Bryan GiraudoCFODERIVAug 24A5,800,051$0.00—?
Bryan GiraudoCFODERIVAug 24A25$1,000.00$25K?
Waage ChristianEVPDERIVAug 24A2,900,026$0.00—?
Steven D. NathanDirDERIVJun 4A115,000$0.00—?
Sandra MilliganDirDERIVJun 4A115,000$0.00—?
John D. QuiselDirDERIVJun 4A115,000$0.00—?
Skye DrynanDirDERIVJun 4A115,000$0.00—?
Thomas O. DanielDirDERIVJun 4A115,000$0.00—?
Russell J. CoxDirDERIVJun 4A115,000$0.00—?
Robert Paul Smith Jr.ChiefDERIVMar 19A572,000——
Robert Paul Smith Jr.ChiefDERIVMar 19A562,500——
Robert Paul Smith Jr.ChiefDERIVMar 19D572,000——
Robert Paul Smith Jr.ChiefDERIVMar 19D562,500——
Caryn PetersonEVPDERIVMar 19A32,334——
Caryn PetersonEVPDERIVMar 19A9,167——
Caryn PetersonEVPDERIVMar 19A22,784——
Caryn PetersonEVPDERIVMar 19A18,834——
Caryn PetersonEVPDERIVMar 19A21,167——
Caryn PetersonEVPDERIVMar 19A126,667——
Caryn PetersonEVPDERIVMar 19A157,500——
Caryn PetersonEVPDERIVMar 19A157,500——
Caryn PetersonEVPDERIVMar 19A125,000——
Caryn PetersonEVPDERIVMar 19A375,000——
Caryn PetersonEVPDERIVMar 19A440,000——
Caryn PetersonEVPDERIVMar 19A506,250——
Caryn PetersonEVPDERIVMar 19D32,334——
Caryn PetersonEVPDERIVMar 19D9,167——
Caryn PetersonEVPDERIVMar 19D22,784——
Caryn PetersonEVPDERIVMar 19D18,834——
Caryn PetersonEVPDERIVMar 19D21,167——
Caryn PetersonEVPDERIVMar 19D126,667——
Caryn PetersonEVPDERIVMar 19D157,500——
Caryn PetersonEVPDERIVMar 19D157,500——
Caryn PetersonEVPDERIVMar 19D125,000——
Caryn PetersonEVPDERIVMar 19D375,000——
Caryn PetersonEVPDERIVMar 19D440,000——
Caryn PetersonEVPDERIVMar 19D506,250——
Faheem HasnainCEODERIVMar 19A43,500——
Faheem HasnainCEODERIVMar 19A47,000——
Faheem HasnainCEODERIVMar 19A325,000——
Faheem HasnainCEODERIVMar 19A650,000——
Faheem HasnainCEODERIVMar 19A544,500——
Faheem HasnainCEODERIVMar 19A544,500——
Faheem HasnainCEODERIVMar 19A437,500——
Faheem HasnainCEODERIVMar 19A1,312,500——
Faheem HasnainCEODERIVMar 19A1,540,000——
Faheem HasnainCEODERIVMar 19A1,680,000——
Faheem HasnainCEODERIVMar 19D43,500——
Faheem HasnainCEODERIVMar 19D47,000——
Faheem HasnainCEODERIVMar 19D325,000——
Faheem HasnainCEODERIVMar 19D650,000——
Faheem HasnainCEODERIVMar 19D544,500——
Faheem HasnainCEODERIVMar 19D544,500——
Faheem HasnainCEODERIVMar 19D437,500——
Faheem HasnainCEODERIVMar 19D1,312,500——
Faheem HasnainCEODERIVMar 19D1,540,000——
Faheem HasnainCEODERIVMar 19D1,680,000——
Bryan GiraudoCFODERIVMar 19A96,667——
Bryan GiraudoCFODERIVMar 19A47,667——
Bryan GiraudoCFODERIVMar 19A60,000——
Bryan GiraudoCFODERIVMar 19A100,000——
Bryan GiraudoCFODERIVMar 19A176,667——
Bryan GiraudoCFODERIVMar 19A211,500——
Bryan GiraudoCFODERIVMar 19A211,500——
Bryan GiraudoCFODERIVMar 19A181,250——
Bryan GiraudoCFODERIVMar 19A543,750——
Bryan GiraudoCFODERIVMar 19A638,000——
Bryan GiraudoCFODERIVMar 19A693,750——
Bryan GiraudoCFODERIVMar 19D96,667——
Bryan GiraudoCFODERIVMar 19D47,667——
Bryan GiraudoCFODERIVMar 19D60,000——
Bryan GiraudoCFODERIVMar 19D100,000——
Bryan GiraudoCFODERIVMar 19D176,667——
Bryan GiraudoCFODERIVMar 19D211,500——
Bryan GiraudoCFODERIVMar 19D211,500——
Bryan GiraudoCFODERIVMar 19D181,250——
Bryan GiraudoCFODERIVMar 19D543,750——
Bryan GiraudoCFODERIVMar 19D638,000——
Bryan GiraudoCFODERIVMar 19D693,750——
Waage ChristianEVPDERIVMar 19A70,000——
Waage ChristianEVPDERIVMar 19A47,667——
Waage ChristianEVPDERIVMar 19A60,000——
Waage ChristianEVPDERIVMar 19A126,667——
Waage ChristianEVPDERIVMar 19A157,500——
Waage ChristianEVPDERIVMar 19A157,500——
Waage ChristianEVPDERIVMar 19A125,000——
Waage ChristianEVPDERIVMar 19A375,000——
Waage ChristianEVPDERIVMar 19A440,000——
Waage ChristianEVPDERIVMar 19A506,250——
Waage ChristianEVPDERIVMar 19D70,000——
Waage ChristianEVPDERIVMar 19D47,667——
Waage ChristianEVPDERIVMar 19D60,000——
Waage ChristianEVPDERIVMar 19D126,667——
Waage ChristianEVPDERIVMar 19D157,500——
Waage ChristianEVPDERIVMar 19D157,500——
Waage ChristianEVPDERIVMar 19D125,000——
Waage ChristianEVPDERIVMar 19D375,000——
Waage ChristianEVPDERIVMar 19D440,000——
Waage ChristianEVPDERIVMar 19D506,250——
Richard ArandaCMODERIVMar 19A30,000——
Richard ArandaCMODERIVMar 19A9,167——
Richard ArandaCMODERIVMar 19A22,784——
Richard ArandaCMODERIVMar 19A40,000——
Richard ArandaCMODERIVMar 19A20,000——
Richard ArandaCMODERIVMar 19A126,667——
Richard ArandaCMODERIVMar 19A157,500——
Richard ArandaCMODERIVMar 19A157,500——
Richard ArandaCMODERIVMar 19A162,500——
Richard ArandaCMODERIVMar 19A487,500——
Richard ArandaCMODERIVMar 19A572,000——
Richard ArandaCMODERIVMar 19A562,500——
Richard ArandaCMODERIVMar 19D30,000——
Richard ArandaCMODERIVMar 19D9,167——
Richard ArandaCMODERIVMar 19D22,784——
Richard ArandaCMODERIVMar 19D40,000——
Richard ArandaCMODERIVMar 19D20,000——
Richard ArandaCMODERIVMar 19D126,667——
Richard ArandaCMODERIVMar 19D157,500——
Richard ArandaCMODERIVMar 19D157,500——
Richard ArandaCMODERIVMar 19D162,500——
Richard ArandaCMODERIVMar 19D487,500——
Richard ArandaCMODERIVMar 19D572,000——
Richard ArandaCMODERIVMar 19D562,500——
Robert Paul Smith Jr.ChiefDERIVJan 2A562,500$0.00—?
Robert Paul Smith Jr.ChiefJan 2A93,750$0.00—
Caryn PetersonEVPDERIVJan 2A506,250$0.00—?
Caryn PetersonEVPJan 2A84,500$0.00—
Faheem HasnainCEODERIVJan 2A1,680,000$0.00—?
Faheem HasnainCEOJan 2A280,000$0.00—
Bryan GiraudoCFODERIVJan 2A693,750$0.00—?
Bryan GiraudoCFOJan 2A115,750$0.00—
Waage ChristianEVPDERIVJan 2A506,250$0.00—?
Waage ChristianEVPJan 2A84,500$0.00—
Richard ArandaCMODERIVJan 2A562,500$0.00—?
Richard ArandaCMOJan 2A93,750$0.00—