HASNAIN FAHEEM

Filed: 3/20/2026ACC: 0001352620-26-000004

InsiderHASNAIN FAHEEMCIK 1352620

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IssuerGOSSAMER BIO, INC.CIK 1728117

DirectorOfficer· Executive Chairman

Since Feb 2019

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

7.12M acquired · 7.12M disposed

Non-Derivative Transactions0

No non-derivative transactions reported

Derivative Transactions20

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

1.68M shares

−1.68M

Strike price

2.88

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

1.54M shares

−1.54M

Strike price

1.13

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

1.31M shares

−1.31M

Strike price

0.97

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

437.50K shares

−437.50K

Strike price

0.838

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

544.50K shares

−544.50K

Strike price

1.21

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

544.50K shares

−544.50K

Strike price

2.16

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

650K shares

−650K

Strike price

11.94

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

325K shares

−325K

Strike price

9.79

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

47K shares

−47K

Strike price

12.10

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

D · Disposition

Converts to

Common Stock

43.50K shares

−43.50K

Strike price

22.10

Held after

0.00

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

1.68M shares

+1.68M

Strike price

0.45

Held after

1.68M

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

1.54M shares

+1.54M

Strike price

0.45

Held after

1.54M

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

1.31M shares

+1.31M

Strike price

0.45

Held after

1.31M

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

437.50K shares

+437.50K

Strike price

0.45

Held after

437.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

544.50K shares

+544.50K

Strike price

0.45

Held after

544.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

544.50K shares

+544.50K

Strike price

0.45

Held after

544.50K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

650K shares

+650K

Strike price

0.45

Held after

650K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

325K shares

+325K

Strike price

0.45

Held after

325K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

47K shares

+47K

Strike price

0.45

Held after

47K

Exercisable

—

3/19/2026

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

43.50K shares

+43.50K

Strike price

0.45

Held after

43.50K

Exercisable

—

3/19/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock1.68M shares	3/19/2026	D · Disposition	−1.68M	2.88	—	0.00
Stock Option (Right to Buy) Direct	Common Stock1.54M shares	3/19/2026	D · Disposition	−1.54M	1.13	—	0.00
Stock Option (Right to Buy) Direct	Common Stock1.31M shares	3/19/2026	D · Disposition	−1.31M	0.97	—	0.00
Stock Option (Right to Buy) Direct	Common Stock437.50K shares	3/19/2026	D · Disposition	−437.50K	0.838	—	0.00
Stock Option (Right to Buy) Direct	Common Stock544.50K shares	3/19/2026	D · Disposition	−544.50K	1.21	—	0.00
Stock Option (Right to Buy) Direct	Common Stock544.50K shares	3/19/2026	D · Disposition	−544.50K	2.16	—	0.00
Stock Option (Right to Buy) Direct	Common Stock650K shares	3/19/2026	D · Disposition	−650K	11.94	—	0.00
Stock Option (Right to Buy) Direct	Common Stock325K shares	3/19/2026	D · Disposition	−325K	9.79	—	0.00
Stock Option (Right to Buy) Direct	Common Stock47K shares	3/19/2026	D · Disposition	−47K	12.10	—	0.00
Stock Option (Right to Buy) Direct	Common Stock43.50K shares	3/19/2026	D · Disposition	−43.50K	22.10	—	0.00
Stock Option (Right to Buy) Direct	Common Stock1.68M shares	3/19/2026	A · Award	+1.68M	0.45	—	1.68M
Stock Option (Right to Buy) Direct	Common Stock1.54M shares	3/19/2026	A · Award	+1.54M	0.45	—	1.54M
Stock Option (Right to Buy) Direct	Common Stock1.31M shares	3/19/2026	A · Award	+1.31M	0.45	—	1.31M
Stock Option (Right to Buy) Direct	Common Stock437.50K shares	3/19/2026	A · Award	+437.50K	0.45	—	437.50K
Stock Option (Right to Buy) Direct	Common Stock544.50K shares	3/19/2026	A · Award	+544.50K	0.45	—	544.50K
Stock Option (Right to Buy) Direct	Common Stock544.50K shares	3/19/2026	A · Award	+544.50K	0.45	—	544.50K
Stock Option (Right to Buy) Direct	Common Stock650K shares	3/19/2026	A · Award	+650K	0.45	—	650K
Stock Option (Right to Buy) Direct	Common Stock325K shares	3/19/2026	A · Award	+325K	0.45	—	325K
Stock Option (Right to Buy) Direct	Common Stock47K shares	3/19/2026	A · Award	+47K	0.45	—	47K
Stock Option (Right to Buy) Direct	Common Stock43.50K shares	3/19/2026	A · Award	+43.50K	0.45	—	43.50K