GIRAUDO BRYAN

Filed: 3/20/2026ACC: 0001740847-26-000004

InsiderGIRAUDO BRYANCIK 1740847

→

IssuerGOSSAMER BIO, INC.CIK 1728117

Officer· Chief Financial Officer

Since Feb 2019

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

2.96M acquired · 2.96M disposed

Non-Derivative Transactions0

No non-derivative transactions reported

Derivative Transactions22

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

693.75K shares

−693.75K

Strike price

2.88

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

638K shares

−638K

Strike price

1.13

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

543.75K shares

−543.75K

Strike price

0.97

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

181.25K shares

−181.25K

Strike price

0.838

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

211.50K shares

−211.50K

Strike price

1.21

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

211.50K shares

−211.50K

Strike price

2.16

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

176.67K shares

−176.67K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

100K shares

−100K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

60K shares

−60K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

47.67K shares

−47.67K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

96.67K shares

−96.67K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

693.75K shares

+693.75K

Strike price

0.45

Held after

693.75K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

638K shares

+638K

Strike price

0.45

Held after

638K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

543.75K shares

+543.75K

Strike price

0.45

Held after

543.75K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

181.25K shares

+181.25K

Strike price

0.45

Held after

181.25K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

211.50K shares

+211.50K

Strike price

0.45

Held after

211.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

211.50K shares

+211.50K

Strike price

0.45

Held after

211.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

176.67K shares

+176.67K

Strike price

0.45

Held after

176.67K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

100K shares

+100K

Strike price

0.45

Held after

100K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

60K shares

+60K

Strike price

0.45

Held after

60K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

47.67K shares

+47.67K

Strike price

0.45

Held after

47.67K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

96.67K shares

+96.67K

Strike price

0.45

Held after

96.67K

Exercisable

—

3/19/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock693.75K shares	3/19/2026	D · Disposition	−693.75K	2.88	—	0.00
Stock Option (Right to Buy) Direct	Common Stock638K shares	3/19/2026	D · Disposition	−638K	1.13	—	0.00
Stock Option (Right to Buy) Direct	Common Stock543.75K shares	3/19/2026	D · Disposition	−543.75K	0.97	—	0.00
Stock Option (Right to Buy) Direct	Common Stock181.25K shares	3/19/2026	D · Disposition	−181.25K	0.838	—	0.00
Stock Option (Right to Buy) Direct	Common Stock211.50K shares	3/19/2026	D · Disposition	−211.50K	1.21	—	0.00
Stock Option (Right to Buy) Direct	Common Stock211.50K shares	3/19/2026	D · Disposition	−211.50K	2.16	—	0.00
Stock Option (Right to Buy) Direct	Common Stock176.67K shares	3/19/2026	D · Disposition	−176.67K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock100K shares	3/19/2026	D · Disposition	−100K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock60K shares	3/19/2026	D · Disposition	−60K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock47.67K shares	3/19/2026	D · Disposition	−47.67K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock96.67K shares	3/19/2026	D · Disposition	−96.67K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock693.75K shares	3/19/2026	A · Award	+693.75K	0.45	—	693.75K
Stock Option (Right to Buy) Direct	Common Stock638K shares	3/19/2026	A · Award	+638K	0.45	—	638K
Stock Option (Right to Buy) Direct	Common Stock543.75K shares	3/19/2026	A · Award	+543.75K	0.45	—	543.75K
Stock Option (Right to Buy) Direct	Common Stock181.25K shares	3/19/2026	A · Award	+181.25K	0.45	—	181.25K
Stock Option (Right to Buy) Direct	Common Stock211.50K shares	3/19/2026	A · Award	+211.50K	0.45	—	211.50K
Stock Option (Right to Buy) Direct	Common Stock211.50K shares	3/19/2026	A · Award	+211.50K	0.45	—	211.50K
Stock Option (Right to Buy) Direct	Common Stock176.67K shares	3/19/2026	A · Award	+176.67K	0.45	—	176.67K
Stock Option (Right to Buy) Direct	Common Stock100K shares	3/19/2026	A · Award	+100K	0.45	—	100K
Stock Option (Right to Buy) Direct	Common Stock60K shares	3/19/2026	A · Award	+60K	0.45	—	60K
Stock Option (Right to Buy) Direct	Common Stock47.67K shares	3/19/2026	A · Award	+47.67K	0.45	—	47.67K
Stock Option (Right to Buy) Direct	Common Stock96.67K shares	3/19/2026	A · Award	+96.67K	0.45	—	96.67K