United States

Securities and Exchange Commission

Washington, D.C. 20549

Schedule 13G

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant

to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed

Pursuant to § 240.13d-2

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)*

GOSSAMER BIO, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

38341P102

(CUSIP Number)

December 31, 2020

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐    Rule 13d-1(b)

☐    Rule 13d-1(c)

☒    Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 38341P102 Schedule 13G Page 1 of 4

1	Names of Reporting Persons Faheem Hasnain
2	Check the Appropriate Box if a Member of a Group     (a) ☐     (b) ☐
3	SEC Use Only
4	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With		5	Sole Voting Power     3,499,472
		6	Shared Voting Power     0
		7	Sole Dispositive Power     3,499,472
		8	Shared Dispositive Power     0
9	Aggregate Amount Beneficially Owned by Each Reporting Person     3,499,472
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 4.6%
12	Type of Reporting Person IN

CUSIP No. 38341P102 Schedule 13G Page 2 of 4

ITEM 1.    (a)     Name of Issuer:

Gossamer Bio, Inc. (the “Issuer”).

(b)    Address of Issuer’s Principal Executive Offices:

3013 Science Park Road, San Diego, California 92121.

ITEM 2.    (a)     Name of Person Filing:

This statement is filed on behalf of Faheem Hasnain (the “Reporting Person”).

(b)    Address or Principal Business Office:

The business address of the Reporting Person is 3013 Science Park Road, San Diego, California 92121.

(c)    Citizenship of each Reporting Person is:

The Reporting Person is a citizen of the United States.

(d)    Title of Class of Securities:

Common Stock, par value $0.0001 per share (“Common Stock”).

(e)    CUSIP Number:

38341P102

ITEM 3.    

Not applicable.

ITEM 4.    Ownership.

The ownership information below represents beneficial ownership of Common Stock of the Issuer as of December 31, 2020, based upon 75,524,254 shares of Common Stock outstanding as of December 31, 2020.

(a) Amount beneficially owned:

The Reporting Person may be deemed to beneficially own 3,499,472 shares of Common Stock, including (i) 20,843 shares of Common Stock issuable upon exercise of stock options held by the Reporting Person that are exercisable or will become exercisable within 60 days of December 31, 2020 and (ii) 3,478,629 shares of Common Stock held by a family trust of which the Reporting Person is a trustee.

CUSIP No. 38341P102 Schedule 13G Page 3 of 4

(b) Percent of class: 4.6%

(c) Number of shares as to which the person has:

(i)    Sole power to vote or to direct the vote: 3,499,472 

(ii)    Shared power to vote or direct the vote: 0

(iii)    Sole power to dispose or to direct the disposition of: 3,499,472

(iv)    Shared power to dispose or to direct the disposition of: 0

ITEM 5.    Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the Reporting Person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: ☒

ITEM 6.    Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

ITEM 7.    Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not applicable.

ITEM 8.    Identification and Classification of Members of the Group.

Not applicable.

ITEM 9.    Notice of Dissolution of Group.

Not applicable.

ITEM 10.     Certification.

Not applicable.

CUSIP No. 38341P102 Schedule 13G Page 4 of 4

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date:    February 12, 2021

Faheem Hasnain

/s/ Faheem Hasnain