CHRISTIAN WAAGE

Filed: 3/20/2026ACC: 0001553179-26-000004

InsiderCHRISTIAN WAAGECIK 1553179

→

IssuerGOSSAMER BIO, INC.CIK 1728117

Officer· EVP & General Counsel

Since Feb 2019

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

2.07M acquired · 2.07M disposed

Non-Derivative Transactions0

No non-derivative transactions reported

Derivative Transactions20

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

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

70K shares

−70K

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

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

70K shares

+70K

Strike price

0.45

Held after

70K

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 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 Stock70K shares	3/19/2026	D · Disposition	−70K	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 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 Stock70K shares	3/19/2026	A · Award	+70K	0.45	—	70K