Gossamer Bio director granted 115K options

Gossamer Bio, Inc. director Russell J. Cox received a grant of stock options covering 115,000 shares of common stock at an exercise price of $0.178 per share.

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Form Type

Rhea-AI Filing Summary

Gossamer Bio, Inc. director Russell J. Cox received a grant of stock options covering 115,000 shares of common stock at an exercise price of $0.178 per share. The award was made under the company’s Non-Employee Director Compensation Program.

The options become fully vested and exercisable on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders, subject to his continued service on the board through that date. Following this grant, Cox holds stock options for 115,000 shares.

Insider Trade Summary

Grant/Award: 115,000 shares

Grant/Award 1 txn

Insider Cox Russell J.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	115,000	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 115,000 contracts (Direct)

Footnotes (2)

F1. Award made pursuant to Non-Employee Director Compensation Program.
F2. The entire number of shares subject to this option becomes fully vested and exercisable on the first to occur of (a) the first anniversary of the grant date or (b) the next occurring annual meeting of the Issuer's stockholders, subject to the Reporting Person's continued service on the board of directors of the Issuer through such vesting date.

Key Figures

Option grant size: 115,000 shares Exercise price: $0.178 per share Expiration date: June 3, 2036 +1 more

4 metrics

Option grant size 115,000 shares Stock options granted to director on June 4, 2026

Exercise price $0.178 per share Strike price for the 115,000 stock options

Expiration date June 3, 2036 Option grant expiration

Total derivative holdings after grant 115,000 options Total stock options held following this transaction

Key Terms

Stock Option (Right to Buy), Non-Employee Director Compensation Program, vested and exercisable, board of directors

4 terms

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

Non-Employee Director Compensation Program financial

"Award made pursuant to Non-Employee Director Compensation Program."

vested and exercisable financial

"becomes fully vested and exercisable on the first to occur"

board of directors financial

"subject to the Reporting Person's continued service on the board of directors"

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Gossamer Bio (GOSS) disclose about Russell J. Cox in this Form 4?

Gossamer Bio reported that director Russell J. Cox received stock options for 115,000 shares of common stock. The grant was made under the Non-Employee Director Compensation Program as part of his board compensation package.

How many Gossamer Bio (GOSS) stock options did Russell J. Cox receive?

Russell J. Cox received stock options covering 115,000 shares of Gossamer Bio common stock. These options represent a new equity award granted as part of his service as a non-employee director on the company’s board.

What is the exercise price of Russell J. Cox’s Gossamer Bio (GOSS) stock options?

The stock options granted to Russell J. Cox have an exercise price of $0.178 per share. This is the price at which he can buy Gossamer Bio common stock if he chooses to exercise the options after they vest.

When do Russell J. Cox’s Gossamer Bio (GOSS) options vest?

The entire 115,000-share option grant vests on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders. Vesting requires Russell J. Cox to continue serving on Gossamer Bio’s board through that date.

When do Russell J. Cox’s Gossamer Bio (GOSS) options expire?

Russell J. Cox’s stock options expire on June 3, 2036. After that expiration date, any unexercised options will no longer be usable to purchase Gossamer Bio common shares under this specific grant.

How many Gossamer Bio (GOSS) derivative securities does Russell J. Cox hold after this grant?

After this grant, Russell J. Cox holds stock options for 115,000 shares of Gossamer Bio common stock. This Form 4 shows his direct ownership of this derivative position following the award transaction.

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Accepted by SEC EDGAR 06/05/2026 - 04:29 PM EDT

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Cox Russell J.

(Last)

(First)

(Middle)

3115 MERRYFIELD ROW, SUITE 120

(Street)

SAN DIEGO

CALIFORNIA

92121

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Gossamer Bio, Inc. [ GOSS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$0.178	06/04/2026		A		115,000⁽¹⁾		⁽²⁾	06/03/2036	Common Stock	115,000	$0	115,000	D

Explanation of Responses:

1. Award made pursuant to Non-Employee Director Compensation Program.

2. The entire number of shares subject to this option becomes fully vested and exercisable on the first to occur of (a) the first anniversary of the grant date or (b) the next occurring annual meeting of the Issuer's stockholders, subject to the Reporting Person's continued service on the board of directors of the Issuer through such vesting date.

Remarks:

	/s/ Christian Waage, Attorney-in-Fact	06/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR