PETERSON CARYN

Filed: 3/20/2026ACC: 0001857256-26-000004

InsiderPETERSON CARYNCIK 1857256

→

IssuerGOSSAMER BIO, INC.CIK 1728117

Officer· EVP, Regulatory Affairs

Since Apr 2021

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

1.99M acquired · 1.99M disposed

Non-Derivative Transactions0

No non-derivative transactions reported

Derivative Transactions24

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

506.25K shares

−506.25K

Strike price

2.88

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

440K shares

−440K

Strike price

1.13

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

375K shares

−375K

Strike price

0.97

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

125K shares

−125K

Strike price

0.838

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

157.50K shares

−157.50K

Strike price

1.21

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

157.50K shares

−157.50K

Strike price

2.16

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

126.67K shares

−126.67K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

21.17K shares

−21.17K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

18.83K shares

−18.83K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

22.78K shares

−22.78K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

9.17K shares

−9.17K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

32.33K shares

−32.33K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

506.25K shares

+506.25K

Strike price

0.45

Held after

506.25K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

440K shares

+440K

Strike price

0.45

Held after

440K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

375K shares

+375K

Strike price

0.45

Held after

375K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

125K shares

+125K

Strike price

0.45

Held after

125K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

157.50K shares

+157.50K

Strike price

0.45

Held after

157.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

157.50K shares

+157.50K

Strike price

0.45

Held after

157.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

126.67K shares

+126.67K

Strike price

0.45

Held after

126.67K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

21.17K shares

+21.17K

Strike price

0.45

Held after

21.17K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

18.83K shares

+18.83K

Strike price

0.45

Held after

18.83K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

22.78K shares

+22.78K

Strike price

0.45

Held after

22.78K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

9.17K shares

+9.17K

Strike price

0.45

Held after

9.17K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

32.33K shares

+32.33K

Strike price

0.45

Held after

32.33K

Exercisable

—

3/19/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock506.25K shares	3/19/2026	D · Disposition	−506.25K	2.88	—	0.00
Stock Option (Right to Buy) Direct	Common Stock440K shares	3/19/2026	D · Disposition	−440K	1.13	—	0.00
Stock Option (Right to Buy) Direct	Common Stock375K shares	3/19/2026	D · Disposition	−375K	0.97	—	0.00
Stock Option (Right to Buy) Direct	Common Stock125K shares	3/19/2026	D · Disposition	−125K	0.838	—	0.00
Stock Option (Right to Buy) Direct	Common Stock157.50K shares	3/19/2026	D · Disposition	−157.50K	1.21	—	0.00
Stock Option (Right to Buy) Direct	Common Stock157.50K shares	3/19/2026	D · Disposition	−157.50K	2.16	—	0.00
Stock Option (Right to Buy) Direct	Common Stock126.67K shares	3/19/2026	D · Disposition	−126.67K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock21.17K shares	3/19/2026	D · Disposition	−21.17K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock18.83K shares	3/19/2026	D · Disposition	−18.83K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock22.78K shares	3/19/2026	D · Disposition	−22.78K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock9.17K shares	3/19/2026	D · Disposition	−9.17K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock32.33K shares	3/19/2026	D · Disposition	−32.33K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock506.25K shares	3/19/2026	A · Award	+506.25K	0.45	—	506.25K
Stock Option (Right to Buy) Direct	Common Stock440K shares	3/19/2026	A · Award	+440K	0.45	—	440K
Stock Option (Right to Buy) Direct	Common Stock375K shares	3/19/2026	A · Award	+375K	0.45	—	375K
Stock Option (Right to Buy) Direct	Common Stock125K shares	3/19/2026	A · Award	+125K	0.45	—	125K
Stock Option (Right to Buy) Direct	Common Stock157.50K shares	3/19/2026	A · Award	+157.50K	0.45	—	157.50K
Stock Option (Right to Buy) Direct	Common Stock157.50K shares	3/19/2026	A · Award	+157.50K	0.45	—	157.50K
Stock Option (Right to Buy) Direct	Common Stock126.67K shares	3/19/2026	A · Award	+126.67K	0.45	—	126.67K
Stock Option (Right to Buy) Direct	Common Stock21.17K shares	3/19/2026	A · Award	+21.17K	0.45	—	21.17K
Stock Option (Right to Buy) Direct	Common Stock18.83K shares	3/19/2026	A · Award	+18.83K	0.45	—	18.83K
Stock Option (Right to Buy) Direct	Common Stock22.78K shares	3/19/2026	A · Award	+22.78K	0.45	—	22.78K
Stock Option (Right to Buy) Direct	Common Stock9.17K shares	3/19/2026	A · Award	+9.17K	0.45	—	9.17K
Stock Option (Right to Buy) Direct	Common Stock32.33K shares	3/19/2026	A · Award	+32.33K	0.45	—	32.33K