ARANDA RICHARD

Filed: 3/20/2026ACC: 0001867872-26-000004

InsiderARANDA RICHARDCIK 1867872

→

IssuerGOSSAMER BIO, INC.CIK 1728117

Officer· Chief Medical Officer

Since Jun 2021

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

2.35M acquired · 2.35M disposed

Non-Derivative Transactions0

No non-derivative transactions reported

Derivative Transactions24

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

562.50K shares

−562.50K

Strike price

2.88

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

572K shares

−572K

Strike price

1.13

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

487.50K shares

−487.50K

Strike price

0.97

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

162.50K shares

−162.50K

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

20K shares

−20K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

40K shares

−40K

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

30K shares

−30K

Strike price

1.36

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

562.50K shares

+562.50K

Strike price

0.45

Held after

562.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

572K shares

+572K

Strike price

0.45

Held after

572K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

487.50K shares

+487.50K

Strike price

0.45

Held after

487.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

162.50K shares

+162.50K

Strike price

0.45

Held after

162.50K

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

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

20K shares

+20K

Strike price

0.45

Held after

20K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

40K shares

+40K

Strike price

0.45

Held after

40K

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

30K shares

+30K

Strike price

0.45

Held after

30K

Exercisable

—

3/19/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock562.50K shares	3/19/2026	D · Disposition	−562.50K	2.88	—	0.00
Stock Option (Right to Buy) Direct	Common Stock572K shares	3/19/2026	D · Disposition	−572K	1.13	—	0.00
Stock Option (Right to Buy) Direct	Common Stock487.50K shares	3/19/2026	D · Disposition	−487.50K	0.97	—	0.00
Stock Option (Right to Buy) Direct	Common Stock162.50K shares	3/19/2026	D · Disposition	−162.50K	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 Stock20K shares	3/19/2026	D · Disposition	−20K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock40K shares	3/19/2026	D · Disposition	−40K	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 Stock30K shares	3/19/2026	D · Disposition	−30K	1.36	—	0.00
Stock Option (Right to Buy) Direct	Common Stock562.50K shares	3/19/2026	A · Award	+562.50K	0.45	—	562.50K
Stock Option (Right to Buy) Direct	Common Stock572K shares	3/19/2026	A · Award	+572K	0.45	—	572K
Stock Option (Right to Buy) Direct	Common Stock487.50K shares	3/19/2026	A · Award	+487.50K	0.45	—	487.50K
Stock Option (Right to Buy) Direct	Common Stock162.50K shares	3/19/2026	A · Award	+162.50K	0.45	—	162.50K
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 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 Stock20K shares	3/19/2026	A · Award	+20K	0.45	—	20K
Stock Option (Right to Buy) Direct	Common Stock40K shares	3/19/2026	A · Award	+40K	0.45	—	40K
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 Stock30K shares	3/19/2026	A · Award	+30K	0.45	—	30K