XFOR

SEC source: 0001628280-21-000147 · wf-form4_160993939587870.xml · derivative · entry 1

Cadavid Diego · CIK 0001778713 · Chief Medical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 121,500

Underlying: Common Stock · 121,500 shares

Expires 2030-12-31

F1 · derivative.exercise_date: 25% of the shares subject to the option shall vest on December 31, 2021, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-017775 · wf-form4_160919084166091.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 280,123

F1 · shares: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · balance_after: Of the shares of common stock reported, 101,714 shares represent unvested restricted stock units.

SEC source: 0001628280-20-016956 · wf-form4_160686171893552.xml · derivative · entry 1

Taveras Arthur · CIK 0001830901 · Chief Scientific Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 121,150

Underlying: Common Stock · 121,150 shares

Expires 2030-11-29

F1 · derivative.exercise_date: 25% of the shares subject tot he option shall vest on November 30, 2021, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-014661 · wf-form4_160331389771325.xml · derivative · entry 1

Stewart Murray · CIK 0001723450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,000

Underlying: Common Stock · 10,000 shares

Expires 2030-10-19

F1 · derivative.exercise_date: 33.3333% of the shares subject to the option shall vest on October 20, 2021, with the remainder vesting in equal monthly installments of 2.7777% of the shares subject to the option until the 36-month anniversary of the date of the grant, subject to the Reporting Person's continued services as a director through each applicable vesting date.

SEC source: 0001628280-20-014331 · wf-form4_160198882301435.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 284,923

F1 · date: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

SEC source: 0001628280-20-014324 · wf-form4_160198457295532.xml · derivative · entry 1

Lawton Alison Frances · CIK 0001542650 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,854

Underlying: Common Stock · 6,854 shares

Expires 2030-10-04

F1 · derivative.exercise_date: 33.3333% of the shares subject to the option shall vest on October 5, 2021, with the remainder vesting thereafter in equal monthly installments of 2.7777% of the shares subject to the option until the 36-month anniversary of the date of the grant, subject to the Reporting Person's continued services as a director through each applicable vesting date.

SEC source: 0001628280-20-014320 · wf-form4_160198417729837.xml · derivative · entry 1

Bridger Gary · CIK 0001600049 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

Underlying: Common Stock · 30,000 shares

Expires 2030-10-04

F1 · derivative.exercise_date: 33.3333% of the shares subject to the option shall vest on October 5, 2021, with the remainder vesting in equal monthly installments of 2.7777% of the shares subject to the option until the 36-month anniversary of the date of the grant, subject to the Reporting Person's continued services as a director through each applicable vesting date.

SEC source: 0001628280-20-014296 · wf-form4_160193029242006.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 286,720

F1 · date: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · balance_after: Of the shares of common stock reported, 101,714 shares represent unvested restricted stock units.

SEC source: 0001628280-20-013832 · wf-form4_160080547296478.xml · nonDerivative · entry 1

Mostafa Adam S. · CIK 0001738081 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,589

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.01 to $7.18, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Represents unvested restricted stock units.

SEC source: 0001628280-20-013419 · wf-form4_159974106828347.xml · nonDerivative · entry 1

Meisner Derek M · CIK 0001752461 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,666

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · shares: Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.57 to $8.96, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F4 · balance_after: Of the shares of common stock reported, 16,666 shares represent unvested restricted stock units.

SEC source: 0001628280-20-013423 · wf-form4_159974138846947.xml · nonDerivative · entry 1

Skerlj Renato · CIK 0001814632 · Chief Scientific Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,076

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · shares: Includes sale of 1,660 shares to cover personal income tax obligation upon settlement of restricted stock unit award.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.57 to $8.96, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F4 · balance_after: Of the shares of common stock reported, 11,666 shares represent unvested restricted stock units.

SEC source: 0001628280-20-013422 · wf-form4_159974132949074.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 287,323

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · shares: Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award.

F3 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.56 to $8.96, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F4 · balance_after: Of the shares of common stock reported, 101,714 shares represent unvested restricted stock units.

SEC source: 0001628280-20-013295 · wf-form4_159916768122522.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 296,163

F1 · shares: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.83 to $8.10, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 101,714 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012840 · wf-form4_159779585056386.xml · nonDerivative · entry 2

Meisner Derek M · CIK 0001752461 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

F3 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 17, 2020. One third of the shares will vest on August 17, 2021, and one third of the shares will vest on August 17, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F4 · balance_after: Of the shares of common stock reported, 16,666 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012846 · wf-form4_159779615491282.xml · nonDerivative · entry 2

Mostafa Adam S. · CIK 0001738081 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,423

F3 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 17, 2020. One third of the shares will vest on August 17, 2021, and one third of the shares will vest on August 17, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F4 · balance_after: Of the shares of common stock reported, 29,589 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012844 · wf-form4_159779605540870.xml · nonDerivative · entry 2

Skerlj Renato · CIK 0001814632 · Chief Scientific Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,910

F3 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 17, 2020. One third of the shares will vest on August 17, 2021, and one third of the shares will vest on August 17, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F4 · balance_after: Of the shares of common stock reported, 11,666 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012842 · wf-form4_159779593780714.xml · nonDerivative · entry 2

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 298,563

F3 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 17, 2020. One third of the shares will vest on August 17, 2021, and one third of the shares will vest on August 17, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F4 · balance_after: Of the shares of common stock reported, 101,713 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012840 · wf-form4_159779585056386.xml · nonDerivative · entry 1

Meisner Derek M · CIK 0001752461 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,500

F1 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 14, 2020. One third of the shares will vest on August 14, 2021, and one third of the shares will vest on August 14, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F2 · balance_after: Of the shares of common stock reported, 8,333 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012846 · wf-form4_159779615491282.xml · nonDerivative · entry 1

Mostafa Adam S. · CIK 0001738081 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,173

F1 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 14, 2020. One third of the shares will vest on August 14, 2021, and one third of the shares will vest on August 14, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F2 · balance_after: Of the shares of common stock reported, 18,756 Shares represent unvested restricted stock units.

SEC source: 0001628280-20-012844 · wf-form4_159779605540870.xml · nonDerivative · entry 1

Skerlj Renato · CIK 0001814632 · Chief Scientific Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,160

F1 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 14, 2020. One third of the shares will vest on August 14, 2021, and one third of the shares will vest on August 14, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F2 · balance_after: Of the shares of common stock reported, 5,833 shares represent unvested restricted stock units.

SEC source: 0001628280-20-012842 · wf-form4_159779593780714.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 253,738

F1 · shares: Represents restricted stock units issued to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. One third of the shares underlying the restricted stock unit award vested on August 14, 2020. One third of the shares will vest on August 14, 2021, and one third of the shares will vest on August 14, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates. Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs.

F2 · balance_after: Of the shares of common stock reported, 71,830 shares represent unvested restricted stock units.

SEC source: 0001628280-20-011642 · wf-form4_159657308658040.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 208,912

F1 · shares: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $7.41 to $7.48, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 41,946 shares represent unvested restricted stock units.

SEC source: 0001628280-20-010212 · wf-form4_159406704677928.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 211,312

F1 · shares: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.79 to $9.26, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 41,946 shares represent unvested restricted stock units.

SEC source: 0001628280-20-010103 · wf-form4_159363420470551.xml · nonDerivative · entry 2

Mostafa Adam S. · CIK 0001738081 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,923

F3 · shares: Shares withheld by X4 Pharmaceuticals Inc. to satisfy taxes payable in connection with the vesting of previously awarded restricted stock units.

SEC source: 0001628280-20-010103 · wf-form4_159363420470551.xml · nonDerivative · entry 1

Mostafa Adam S. · CIK 0001738081 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,839

F1 · shares: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.54 to $9.19, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0001628280-20-009236 · wf-form4_159187851570790.xml · derivative · entry 1

WYZGA MICHAEL S · CIK 0001201256 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009232 · wf-form4_159187825019179.xml · derivative · entry 1

MCGIRR DAVID W J · CIK 0001219023 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009293 · wf-form4_159191113695970.xml · derivative · entry 1

Skerlj Renato · CIK 0001814632 · Chief Scientific Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Stock · 50,000 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 25% of the shares subject to the option shall vest on June 10, 2021, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009240 · wf-form4_159187884350300.xml · derivative · entry 1

Aliski William · CIK 0001598426 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009238 · wf-form4_159187868380574.xml · derivative · entry 1

Russo Rene · CIK 0001722066 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009234 · wf-form4_159187834596343.xml · derivative · entry 1

Stewart Murray · CIK 0001723450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-009230 · wf-form4_159187812734850.xml · derivative · entry 1

Bridger Gary · CIK 0001600049 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2030-06-09

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 10, 2020, with the remainder vesting in equal monthly installments of 8.333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant) subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001628280-20-008920 · wf-form4_159121717676693.xml · nonDerivative · entry 3

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 213,712

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F5 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.80 to $9.00, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 41,946 shares represent unvested restricted stock units.

SEC source: 0001628280-20-008920 · wf-form4_159121717676693.xml · nonDerivative · entry 2

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 223,419

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F4 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.56 to $8.75, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 41,946 shares represent unvested restricted stock units.

SEC source: 0001628280-20-008920 · wf-form4_159121717676693.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 225,819

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · shares: Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award

F3 · balance_after: Of the shares of common stock reported, 41,946 shares represent unvested restricted stock units.

SEC source: 0001628280-20-006483 · wf-form4_158871392097182.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,094

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.87 to $8.99, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units.

SEC source: 0001628280-20-004587 · wf-form4_158594394310542.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 232,494

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.02 to $8.75, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units.

SEC source: 0001628280-20-002798 · wf-form4_158327274059484.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 234,894

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $10.555 to $10.76, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F3 · balance_after: Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units.

SEC source: 0001628280-19-014580 · wf-form4_157488901181061.xml · derivative · entry 1

Meisner Derek M · CIK 0001752461 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,000

Underlying: Common Stock · 55,000 shares

Expires 2029-11-25

F1 · derivative.exercise_date: 25% of the shares subject to the option shall vest on November 26, 2020, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0001209191-19-050347 · doc4.xml · derivative · entry 1

Aliski William · CIK 0001598426 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,854

Underlying: Common Stock · 6,854 shares

Expires 2029-09-18

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on September 18, 2020, with the remainder vesting in equal monthly installments of 2.7777% of the shares underlying the initial grant until the 36-month anniversary of the date of the grant, subject the Reporting Person's continued service through each applicable vesting date.

SEC source: 0000899243-19-017421 · doc4.xml · derivative · entry 2

Mostafa Adam S. · CIK 0001738081 · CFO and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,847

Underlying: Common Stock · 15,847 shares

Expires 2029-06-17

F3 · derivative.exercise_date: 25% of the shares subject to the option shall vest on June 17, 2020, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0000899243-19-017421 · doc4.xml · nonDerivative · entry 1

Mostafa Adam S. · CIK 0001738081 · CFO and Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,564

F1 · shares: Grant of restricted stock units to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, with each restricted stock unit representing the contingent right to receive one share of common stock on the applicable vesting date. No amount was paid upon grant of the units. The restricted stock units vest in four equal annual installments on June 30, 2020, June 30, 2021, June 30, 2022 and June 30, 2023, subject to the Reporting Person continuing to provide services through each such date.

F2 · balance_after: Represents unvested restricted stock units.

SEC source: 0000899243-19-017422 · doc4.xml · derivative · entry 1

MCGIRR DAVID W J · CIK 0001219023 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2029-06-17

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 17, 2019, with the remainder vesting in equal monthly installments of 8.3333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant), subject to the Reporting Person continuing to provide service through each such date.

SEC source: 0000899243-19-017423 · doc4.xml · derivative · entry 1

Russo Rene · CIK 0001722066 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,427

Underlying: Common Stock · 3,427 shares

Expires 2029-06-17

F1 · derivative.exercise_date: 8.3333% of the shares subject to the option shall vest on July 17, 2019, with the remainder vesting in equal monthly installments of 8.3333% of the shares subject to the option until the 12-month anniversary of the date of the grant (or, if earlier, the date of the Issuer's next annual meeting of stockholders following the date of the grant), subject to the Reporting Person continuing to provide service through each such date.

SEC source: 0000899243-19-017419 · doc4.xml · derivative · entry 2

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 83,893

Underlying: Common Stock · 83,893 shares

Expires 2029-06-17

F3 · derivative.exercise_date: 25% of the shares subject to the option shall vest on June 17, 2020, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0000899243-19-017419 · doc4.xml · nonDerivative · entry 1

Ragan Paula · CIK 0001769914 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 237,294

F1 · shares: Grant of restricted stock units to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, with each restricted stock unit representing the contingent right to receive one share of common stock on the applicable vesting date. No amount was paid upon grant of the units. The restricted stock units vest in four equal annual installments on May 31, 2020, May 31, 2021, May 31, 2022 and May 31, 2023, subject to the Reporting Person continuing to provide services through each such date.

F2 · balance_after: Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units.

SEC source: 0000899243-19-011289 · doc4.xml · derivative · entry 1

Kelley Lynne E · CIK 0001667584 · Chief Medical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,170

Underlying: Common Stock · 37,170 shares

Expires 2029-04-24

F1 · derivative.exercise_date: 25% of the shares subject to the option shall vest on April 24, 2020, with the remainder vesting in equal installments of 2.083% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date.

SEC source: 0000899243-19-009663 · doc4.xml · derivative · entry 1

Stewart Murray · CIK 0001723450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,854

Underlying: Common Stock · 6,854 shares

Expires 2029-03-29

F1 · derivative.exercise_date: 33.3333% of the shares subject to the option shall vest on March 29, 2020, with the remainder vesting in equal monthly installments of 2.7777% of the shares subject to the option until the 36-month anniversary of the date of the award, subject the Reporting Person continuing to provide services through each such date. This option was granted automatically upon the Reporting Person's election to the Board of Directors of the Issuer.

SEC source: 0000899243-19-007828 · doc4.xml · derivative · entry 1

BLECH ISAAC · CIK 0000905536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,796

Underlying: Common Stock · 70,796 shares

Expires 2025-12-14

F2 · price: Reflects the Reporting Person's stock option to acquire 744,967 shares of X4 common stock for $0.65 per share that was assumed by the Issuer in the merger of Artemis AC Corp., a wholly-owned subsidiary of the Issuer, with and into X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) ("X4") on March 13, 2019 (the "Merger").

F1 · derivative.exercise_date: Fully vested.

SEC source: 0000899243-19-007821 · doc4.xml · derivative · entry 1

Mostafa Adam S. · CIK 0001738081 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 62,633

Underlying: Common Stock · 62,633 shares

Expires 2028-10-03

F2 · price: Reflects the Reporting Person's stock option to acquire 659,067 shares of X4 common stock for $0.99 per share that was assumed by the Issuer in the merger of Artemis AC Corp., a wholly-owned subsidiary of the Issuer, with and into X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) ("X4") on March 13, 2019 (the "Merger").

F1 · derivative.exercise_date: Twenty-five percent (25%) of the shares subject to the option vested on October 4, 2019, and one thirty-sixth (1/36th) of the remaining shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to provide service through each such date.