Gossamer Bio, Inc. — Director's Dealing 2019

Feb 8, 2019

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Gossamer Bio, Inc. (GOSS)
CIK: 0001728117
Period of Report: 2019-02-07

Reporting Person: Giraudo Bryan (Chief Financial Officer)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series A Preferred Stock	$0.00		Common Stock (12698)		Direct
Series B Preferred Stock	$0.00		Common Stock (5181)		Direct
Stock Option (Right to Buy)	$2.61	2028-05-21	Common Stock (405666)		Direct
Stock Option (Right to Buy)	$10.71	2028-12-10	Common Stock (155555)		Direct

Footnotes

F1: The 57,142 shares of Series A Preferred Stock held by the Reporting Person are convertible, at any time, at the holder's election, at a ratio of 4.5 to one share of the Issuer's common stock. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series A Preferred Stock will automatically convert at a ratio of 4.5 to one share of the Issuer's common stock. The Series A Preferred Stock has no expiration date.

F2: The 23,316 shares of Series B Preferred Stock held by the Reporting Person are convertible, at any time, at the holder's election, at a ratio of 4.5 to one share of the Issuer's common stock. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series B Preferred Stock will automatically convert at a ratio of 4.5 to one share of the Issuer's common stock. The Series B Preferred Stock has no expiration date.

F3: 25% of the total number of shares subject to the option will vest on May 7, 2019 and 1/48th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Corporation on each such vesting date. The shares subject to the option are also subject to certain accelerated vesting provisions as set forth in more detail in the employment agreement between the Issuer and the Reporting Person.

F4: 25% of the total number of shares subject to the option will vest on December 7, 2019 and 1/48th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Corporation on each such vesting date. The shares subject to the option are also subject to certain accelerated vesting provisions as set forth in more detail in the employment agreement between the Issuer and the Reporting Person.