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Giraudo Bryan

Disclosed activity across 2 companies

Tapewire entity
19370
SEC CIK
0001740847

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Gossamer Bio, Inc.GOSS · Entity 6928COO/CFOAugust 24, 2026August 26, 2026
Protagonist Therapeutics, IncPTGX · Entity 3552DirectorMay 07, 2026May 12, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Gossamer Bio, Inc.

Report date August 24, 2026 · Filed August 26, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Pre-Funded Warrant (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $0.00IndirectBy Family Trust25 Reported balance After 2026-08-24 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2026-08-24 · Grant · Acquired 25 · Balance 25

F1: Each share of Series A-1 non-voting convertible preferred stock is convertible automatically upon receipt of stockholder approval under applicable Nasdaq rules and regulations in connection with the Issuer's private placement pursuant to which the Pre-Funded Warrants were issued ("Stockholder Approval") into a number of shares of the Issuer's common stock equal to $1,000 divided by $0.14, pursuant to the terms of the Series A-1 Certificate of Designation and subject to applicable beneficial ownership limitations.

F2: The Pre-Funded Warrant has no expiration date and is exercisable immediately. Prior to the Issuer obtaining Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of Series A-1 non-voting convertible preferred stock. Following the Issuer's receipt of Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of the Issuer's common stock.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $0.18 · Expires 2036-08-23Direct5,800,051 Reported balance After 2026-08-24 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2026-08-24 · Grant · Acquired 5,800,051 · Balance 5,800,051

F3: 50% of the total number of shares subject to the option will vest upon FDA approval of seralutinib, and 1/24th of the remaining 50% of the total number of shares subject to the option will vest on the last day of each one-month period after such FDA approval, in each case subject to the Reporting Person's continuous service to the Issuer on each such vesting date. To the extent FDA approval of seralutinib does not occur on or prior to the date that is two years following the grant date of the option, 1/24th of the total number of shares subject to the option will vest on the last day of each one-month period following the date that is two years following the grant date of the option, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.

Filing footnotes · ownership attribution and instrument terms

F1: Each share of Series A-1 non-voting convertible preferred stock is convertible automatically upon receipt of stockholder approval under applicable Nasdaq rules and regulations in connection with the Issuer's private placement pursuant to which the Pre-Funded Warrants were issued ("Stockholder Approval") into a number of shares of the Issuer's common stock equal to $1,000 divided by $0.14, pursuant to the terms of the Series A-1 Certificate of Designation and subject to applicable beneficial ownership limitations.

F2: The Pre-Funded Warrant has no expiration date and is exercisable immediately. Prior to the Issuer obtaining Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of Series A-1 non-voting convertible preferred stock. Following the Issuer's receipt of Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of the Issuer's common stock.

F3: 50% of the total number of shares subject to the option will vest upon FDA approval of seralutinib, and 1/24th of the remaining 50% of the total number of shares subject to the option will vest on the last day of each one-month period after such FDA approval, in each case subject to the Reporting Person's continuous service to the Issuer on each such vesting date. To the extent FDA approval of seralutinib does not occur on or prior to the date that is two years following the grant date of the option, 1/24th of the total number of shares subject to the option will vest on the last day of each one-month period following the date that is two years following the grant date of the option, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.

Protagonist Therapeutics, Inc

Report date May 07, 2026 · Filed May 12, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect31,825 Reported balance After 2026-05-07 transaction · row 1 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 1 · 2026-05-07 · Exercise / conversion · Acquired 24,000 · Balance 31,825

F1: Reflects 10,000 shares of common stock that were previously held directly by the Reporting Person and which were transferred to the Bryan & Courtney Giraudo Trust.

Common StockSEC Table I · non-derivativeDirect43,825 Reported balance After 2026-05-07 transaction · row 2 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 2 · 2026-05-07 · Exercise / conversion · Acquired 12,000 · Balance 43,825

Common StockSEC Table I · non-derivativeDirect27,825 Reported balance After 2026-05-07 transaction · row 3 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 3 · 2026-05-07 · Sale · Disposed 36,000 · Balance 27,825

F2: The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $98.69 to $104.67. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

Common StockSEC Table I · non-derivativeDirect12,695 Reported balance After 2026-05-08 transaction · row 6 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 6 · 2026-05-08 · Sale · Disposed 5,130 · Balance 12,695

Common StockSEC Table I · non-derivativeIndirectBy Bryan & Courtney Giraudo Trust6,000 Reported balance After 2026-05-07 transaction · row 4 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 4 · 2026-05-07 · Sale · Disposed 12,000 · Balance 6,000

F1: Reflects 10,000 shares of common stock that were previously held directly by the Reporting Person and which were transferred to the Bryan & Courtney Giraudo Trust.

Common StockSEC Table I · non-derivativeIndirectBy Bryan & Courtney Giraudo Trust0 Reported balance After 2026-05-08 transaction · row 5 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 5 · 2026-05-08 · Sale · Disposed 6,000 · Balance 0

Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $6.45 · Expires 2028-05-14Direct0 Reported balance After 2026-05-07 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2026-05-07 · Exercise / conversion · Disposed 24,000 · Balance 0

F3: These stock options are fully vested.

Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $6.98 · Expires 2028-05-28Direct0 Reported balance After 2026-05-07 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-05-07 · Exercise / conversion · Disposed 12,000 · Balance 0

F3: These stock options are fully vested.

Filing footnotes · ownership attribution and instrument terms

F1: Reflects 10,000 shares of common stock that were previously held directly by the Reporting Person and which were transferred to the Bryan & Courtney Giraudo Trust.

F2: The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $98.69 to $104.67. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

F3: These stock options are fully vested.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 24, 2026 Filed Aug 26, 2026 22:10 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 5,800,051 $0.00 Strike: $0.18 $0.00
Disclosure

SEC source: 0001740847-26-000006 · wk-form4_1787782215.xml · derivative · entry 2

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,800,051

Underlying: Common Stock · 5,800,051 shares

Expires 2036-08-23

F3 · derivative.exercise_date: 50% of the total number of shares subject to the option will vest upon FDA approval of seralutinib, and 1/24th of the remaining 50% of the total number of shares subject to the option will vest on the last day of each one-month period after such FDA approval, in each case subject to the Reporting Person's continuous service to the Issuer on each such vesting date. To the extent FDA approval of seralutinib does not occur on or prior to the date that is two years following the grant date of the option, 1/24th of the total number of shares subject to the option will vest on the last day of each one-month period following the date that is two years following the grant date of the option, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.

Read SEC document
August 24, 2026 Filed Aug 26, 2026 22:10 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantPre-Funded Warrant (Right to Buy) · Derivative 25 $1,000.00 Strike: $0.00 $24,999.98
Disclosure

SEC source: 0001740847-26-000006 · wk-form4_1787782215.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Family Trust

Disclosed balance after: 25

Underlying: Series A-1 Preferred Stock · 25 shares

Expires not disclosed

F1 · shares: Each share of Series A-1 non-voting convertible preferred stock is convertible automatically upon receipt of stockholder approval under applicable Nasdaq rules and regulations in connection with the Issuer's private placement pursuant to which the Pre-Funded Warrants were issued ("Stockholder Approval") into a number of shares of the Issuer's common stock equal to $1,000 divided by $0.14, pursuant to the terms of the Series A-1 Certificate of Designation and subject to applicable beneficial ownership limitations.

F2 · derivative.expiration_date: The Pre-Funded Warrant has no expiration date and is exercisable immediately. Prior to the Issuer obtaining Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of Series A-1 non-voting convertible preferred stock. Following the Issuer's receipt of Stockholder Approval, the Pre-Funded Warrants are only exercisable for shares of the Issuer's common stock.

F1 · derivative.underlying: Each share of Series A-1 non-voting convertible preferred stock is convertible automatically upon receipt of stockholder approval under applicable Nasdaq rules and regulations in connection with the Issuer's private placement pursuant to which the Pre-Funded Warrants were issued ("Stockholder Approval") into a number of shares of the Issuer's common stock equal to $1,000 divided by $0.14, pursuant to the terms of the Series A-1 Certificate of Designation and subject to applicable beneficial ownership limitations.

F1 · derivative.underlying_shares: Each share of Series A-1 non-voting convertible preferred stock is convertible automatically upon receipt of stockholder approval under applicable Nasdaq rules and regulations in connection with the Issuer's private placement pursuant to which the Pre-Funded Warrants were issued ("Stockholder Approval") into a number of shares of the Issuer's common stock equal to $1,000 divided by $0.14, pursuant to the terms of the Series A-1 Certificate of Designation and subject to applicable beneficial ownership limitations.

Read SEC document
May 08, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 SaleCommon Stock 5,130 $100.00 $513,000.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 6

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,695

Read SEC document
May 08, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 SaleCommon Stock 6,000 $100.00 $600,000.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 5

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Bryan & Courtney Giraudo Trust

Disclosed balance after: 0

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 Exercise / conversionStock Option (right to buy) · Derivative 12,000 $0.00 Strike: $6.98 $0.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · derivative · entry 8

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,000 shares

Expires 2028-05-28

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: These stock options are fully vested.

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 Exercise / conversionStock Option (right to buy) · Derivative 24,000 $0.00 Strike: $6.45 $0.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · derivative · entry 7

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 24,000 shares

Expires 2028-05-14

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: These stock options are fully vested.

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 SaleCommon Stock 12,000 $100.07 $1,200,840.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 4

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Bryan & Courtney Giraudo Trust

Disclosed balance after: 6,000

F1 · balance_after: Reflects 10,000 shares of common stock that were previously held directly by the Reporting Person and which were transferred to the Bryan & Courtney Giraudo Trust.

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 SaleCommon Stock 36,000 $100.14 $3,605,040.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 3

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,825

F2 · price: The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $98.69 to $104.67. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 Exercise / conversionCommon Stock 12,000 $6.98 $83,760.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 2

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,825

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
May 07, 2026 Filed May 12, 2026 00:25 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 Exercise / conversionCommon Stock 24,000 $6.45 $154,800.00
Disclosure

SEC source: 0001104659-26-058860 · tm2614277-1_4seq1.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,825

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Reflects 10,000 shares of common stock that were previously held directly by the Reporting Person and which were transferred to the Bryan & Courtney Giraudo Trust.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 96,667 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 22

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,667

Underlying: Common Stock · 96,667 shares

Expires 2029-03-25

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · shares: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 47,667 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 21

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,667

Underlying: Common Stock · 47,667 shares

Expires 2030-02-14

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 60,000 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 20

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Common Stock · 60,000 shares

Expires 2031-02-25

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 100,000 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 19

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2031-09-15

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 176,667 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 18

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,667

Underlying: Common Stock · 176,667 shares

Expires 2032-01-05

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 211,500 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 17

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 211,500

Underlying: Common Stock · 211,500 shares

Expires 2032-12-06

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 211,500 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 16

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 211,500

Underlying: Common Stock · 211,500 shares

Expires 2033-03-19

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 181,250 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 15

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,250

Underlying: Common Stock · 181,250 shares

Expires 2033-11-19

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 543,750 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 14

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 543,750

Underlying: Common Stock · 543,750 shares

Expires 2034-01-01

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 638,000 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 13

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 638,000

Underlying: Common Stock · 638,000 shares

Expires 2025-03-03

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 693,750 Not disclosed Strike: $0.45 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 12

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 693,750

Underlying: Common Stock · 693,750 shares

Expires 2036-01-01

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 96,667 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 11

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 96,667 shares

Expires 2029-03-25

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 47,667 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 10

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 47,667 shares

Expires 2030-02-14

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 60,000 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 9

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 60,000 shares

Expires 2031-02-25

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 100,000 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 8

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 100,000 shares

Expires 2031-09-16

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 176,667 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 7

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 176,667 shares

Expires 2032-01-05

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 211,500 Not disclosed Strike: $2.16 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 6

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 211,500 shares

Expires 2032-12-06

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 211,500 Not disclosed Strike: $1.21 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 5

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 211,500 shares

Expires 2033-03-19

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 181,250 Not disclosed Strike: $0.84 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 4

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 181,250 shares

Expires 2033-11-19

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 543,750 Not disclosed Strike: $0.97 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 3

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 543,750 shares

Expires 2034-01-01

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 638,000 Not disclosed Strike: $1.13 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 2

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 638,000 shares

Expires 2035-03-03

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:16 UTC Gossamer Bio, Inc. GOSS · Entity 6928 Disposition to issuerStock Option (Right to Buy) · Derivative 693,750 Not disclosed Strike: $2.88 Not disclosed
Disclosure

SEC source: 0001740847-26-000004 · wk-form4_1774037809.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 693,750 shares

Expires 2036-01-01

F1 · kind: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F1 · price: Effective as of March 19, 2026 (the "Repricing Date"), the Issuer approved a one-time repricing of certain outstanding stock options (the "Repriced Options") granted under the Issuer's 2019 Incentive Award Plan (the "2019 Plan"), which reduced the per share exercise price of each Repriced Option to $0.45 (the "Option Repricing"). Except as modified by the Option Repricing, all other terms and conditions of the Repriced Options, including, without limitation, any provisions with respect to vesting and term of the Repriced Options, remain in full force and effect.

F2 · derivative.exercise_date: This stock option award was issued pursuant to the 2019 Plan and becomes exercisable in accordance with the vesting schedule specified in the award agreement and as previously reported on applicable Form 4, subject to the Reporting Person's continued service with the Issuer as of the applicable vesting date.

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January 02, 2026 Filed Jan 5, 2026 21:39 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 693,750 $0.00 Strike: $2.88 $0.00
Disclosure

SEC source: 0001740847-26-000002 · wk-form4_1767649172.xml · derivative · entry 3

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 693,750

Underlying: Common Stock · 693,750 shares

Expires 2036-01-01

F2 · derivative.exercise_date: 25% of the total number of shares subject to the option will vest on January 2, 2027 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 Issuer on each such vesting date.

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January 02, 2026 Filed Jan 5, 2026 21:39 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantCommon Stock 115,750 $0.00 $0.00
Disclosure

SEC source: 0001740847-26-000002 · wk-form4_1767649172.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 389,737

F1 · shares: Represents restricted stock unit award, which will vest in four equal annual installments in accordance with the terms of the award and subject to the Reporting Person's continuous service to the Issuer on each vesting date.

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January 02, 2026 Filed Jan 7, 2026 00:41 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 GrantStock Option (right to buy) · Derivative 3,762 $0.00 Strike: $87.18 $0.00
Disclosure

SEC source: 0001104659-26-001477 · tm262304-6_4seq1.xml · derivative · entry 3

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,762

Underlying: Common Stock · 3,762 shares

Expires 2036-01-02

F2 · derivative.exercise_date: The stock option vests in 12 equal monthly installments following January 2, 2026, subject to the Reporting Person's continued service to the Issuer through each applicable vesting date.

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January 02, 2026 Filed Jan 7, 2026 00:41 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 GrantCommon Stock 2,695 $0.00 $0.00
Disclosure

SEC source: 0001104659-26-001477 · tm262304-6_4seq1.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,825

F1 · shares: Represents grant of restricted stock units payable solely in common stock that will vest in full on January 15, 2027, subject to the Reporting Person's continued service to the Issuer through the vesting date.

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October 01, 2025 Filed Oct 2, 2025 20:13 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantCommon Stock 181,250 $0.00 $0.00
Disclosure

SEC source: 0001740847-25-000003 · wk-form4_1759436009.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 273,987

F1 · shares: Represents performance stock unit award, which will vest in full upon the earlier of (i) the approval of a new drug application for seralutinib or (ii) a change in control, in either case on or prior to the fourth anniversary of the grant date, and subject to the Reporting Person's continuous service to the Issuer.

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March 04, 2025 Filed Mar 6, 2025 21:04 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 638,000 $0.00 Strike: $1.13 $0.00
Disclosure

SEC source: 0001728117-25-000010 · wk-form4_1741295043.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 638,000

Underlying: Common Stock · 638,000 shares

Expires 2035-03-03

F1 · derivative.exercise_date: 25% of the total number of shares subject to the option will vest on March 4, 2026 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 Issuer on each such vesting date.

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January 02, 2025 Filed Jan 6, 2025 23:07 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 GrantStock Option (right to buy) · Derivative 6,584 $0.00 Strike: $38.98 $0.00
Disclosure

SEC source: 0001104659-25-001428 · tm252003-3_4seq1.xml · derivative · entry 3

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,584

Underlying: Common Stock · 6,584 shares

Expires 2035-01-02

F2 · derivative.exercise_date: The stock option vests in 12 equal monthly installments following January 2, 2025, subject to the Reporting Person's continued service to the Issuer through each applicable vesting date.

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January 02, 2025 Filed Jan 6, 2025 23:07 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 GrantCommon Stock 5,130 $0.00 $0.00
Disclosure

SEC source: 0001104659-25-001428 · tm252003-3_4seq1.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,130

F1 · shares: Represents grant of restricted stock units payable solely in common stock that will vest in full on January 15, 2026, subject to the Reporting Person's continued service to the Issuer through the vesting date.

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June 18, 2024 Filed Jun 21, 2024 00:21 UTC Gossamer Bio, Inc. GOSS · Entity 6928 PurchaseCommon Stock 100,000 $0.59 $59,110.00
Disclosure

SEC source: 0001728117-24-000073 · wk-form4_1718929291.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Indirect · By family trust

Disclosed balance after: 480,010

F1 · kind: The Reporting Person's purchase of common stock reported herein was matchable under Section 16(b) of the Securities Exchange Act of 1934, to the extent of 6,430 shares, with the Reporting Person's sale of 6,430 shares of common stock at a price of $1.1556 per share on March 27, 2024. The reporting person has agreed to pay to the Issuer $3,653.10, representing the full amount of the profit realized in connection with the short-swing transaction, less transaction costs.

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March 27, 2024 Filed Mar 28, 2024 22:05 UTC Gossamer Bio, Inc. GOSS · Entity 6928 SaleCommon Stock 6,430 $1.16 $7,430.51
Disclosure

SEC source: 0001728117-24-000039 · wk-form4_1711663523.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,737

F1 · shares: Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units.

F2 · price: This transaction was executed in multiple trades at prices ranging from $1.1551 to $1.165 per share. The price reported above reflects the weighted average sale price for the entire number of shares sold. Information on the exact number of shares sold at each sale price can be obtained from the Issuer upon request.

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January 02, 2024 Filed Jan 5, 2024 01:10 UTC Protagonist Therapeutics, Inc PTGX · Entity 3552 GrantStock Option (right to buy) · Derivative 25,700 $0.00 Strike: $23.42 $0.00
Disclosure

SEC source: 0001104659-24-001491 · tm241954-3_4seq1.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,700

Underlying: Common Stock · 25,700 shares

Expires 2034-01-02

F1 · derivative.exercise_date: The stock option vests in 12 equal monthly installments following January 2, 2024, subject to the Reporting Person's continued service to the Issuer through each applicable vesting date.

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January 02, 2024 Filed Jan 4, 2024 22:02 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 543,750 $0.00 Strike: $0.97 $0.00
Disclosure

SEC source: 0001728117-24-000004 · wk-form4_1704405725.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 543,750

Underlying: Common Stock · 543,750 shares

Expires 2034-01-01

F1 · derivative.exercise_date: 25% of the total number of shares subject to the option will vest on January 2, 2025 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 Issuer on each such vesting date.

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November 20, 2023 Filed Nov 23, 2023 00:07 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 181,250 $0.00 Strike: $0.84 $0.00
Disclosure

SEC source: 0001728117-23-000147 · wk-form4_1700698050.xml · derivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,250

Underlying: Common Stock · 181,250 shares

Expires 2033-11-19

F1 · derivative.exercise_date: 25% of the total number of shares subject to the option will vest on November 20, 2024 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 Issuer on each such vesting date.

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November 13, 2023 Filed Nov 14, 2023 23:24 UTC Gossamer Bio, Inc. GOSS · Entity 6928 PurchaseCommon Stock 200,000 $0.56 $112,880.00
Disclosure

SEC source: 0001728117-23-000136 · wk-form4_1700004245.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Indirect · By family trust

Disclosed balance after: 380,010

F1 · price: This transaction was executed in multiple trades at prices ranging from $0.5557 to $0.5723 per share. The price reported above reflects the weighted average sale price for the entire number of shares sold. Information on the exact number of shares sold at each sale price can be obtained from the Issuer upon request.

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July 24, 2023 Filed Jul 26, 2023 20:03 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantCommon Stock · Derivative 13,505 $0.13 Strike: $2.04 $1,688.13
Disclosure

SEC source: 0001728117-23-000100 · wf-form4_169040180880782.xml · derivative · entry 3

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Indirect · By family trust

Disclosed balance after: 13,505

Underlying: Common Stock Purchase Warrants · 13,505 shares

Expires 2028-07-24

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July 24, 2023 Filed Jul 26, 2023 20:03 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantCommon Stock 54,020 $1.82 $98,316.40
Disclosure

SEC source: 0001728117-23-000100 · wf-form4_169040180880782.xml · nonDerivative · entry 1

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Indirect · By family trust

Disclosed balance after: 180,010

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May 05, 2023 Filed May 9, 2023 20:15 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 176,667 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001728117-23-000053 · wf-form4_168366328309495.xml · derivative · entry 10

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,667

Underlying: Common Stock · 176,667 shares

Expires 2032-01-05

F11 · derivative.exercise_price: The exercise price of the option is $1.36 per share, representing the fair market value per share of the Issuer's common stock on the date of grant; provided that in the event the option is exercised prior to May 5, 2024, or the Reporting Person's employment terminates prior to May 5, 2024 other than due to death, disability or circumstances giving rise to severance under the Reporting Person's employment agreement, the exercise price will be increased to the exercise price of the cancelled option in exchange for which this option was granted.

F10 · price: On May 5, 2023, the Issuer canceled an option granted on January 6, 2022. In exchange for the canceled option, the reporting person received 176,677 options to purchase common stock having a lower exercise price with the same vesting terms.

F9 · derivative.exercise_date: One-third of the total number of shares subject to the option vested on January 6, 2023 and 1/36th 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 Issuer on each such vesting date.

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May 05, 2023 Filed May 9, 2023 20:15 UTC Gossamer Bio, Inc. GOSS · Entity 6928 GrantStock Option (Right to Buy) · Derivative 100,000 Not disclosed Strike: $1.36 Not disclosed
Disclosure

SEC source: 0001728117-23-000053 · wf-form4_168366328309495.xml · derivative · entry 9

Giraudo Bryan · CIK 0001740847 · COO/CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2031-09-16

F11 · derivative.exercise_price: The exercise price of the option is $1.36 per share, representing the fair market value per share of the Issuer's common stock on the date of grant; provided that in the event the option is exercised prior to May 5, 2024, or the Reporting Person's employment terminates prior to May 5, 2024 other than due to death, disability or circumstances giving rise to severance under the Reporting Person's employment agreement, the exercise price will be increased to the exercise price of the cancelled option in exchange for which this option was granted.

F8 · price: On May 5, 2023, the Issuer canceled an option granted on September 16, 2021. In exchange for the canceled option, the reporting person received 100,000 options to purchase common stock having a lower exercise price with the same vesting terms.

F7 · derivative.exercise_date: 25% of the total number of shares subject to the option vested on September 16, 2022 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.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.