Huber Martin H. Jr.

SEC source: 0001683168-26-004243 · ownership.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock · 15,000 shares

Expires 2036-05-21

F1 · derivative.exercise_date: Options will vest in full on the anniversary of the grant date.

SEC source: 0001193125-26-041344 · ownership.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,000

F1 · shares: Award of Restricted Stock Units that vests one year from the date of grant. The shares underlying such Restricted Stock Units will not be delivered to the Reporting Person and may not be transferred or sold until the earlier of a separation from service, death, disability or change in control.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 19

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,256 shares

Expires not disclosed

F5 · price: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 18

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,328 shares

Expires not disclosed

F5 · price: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 17

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,340 shares

Expires not disclosed

F5 · price: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

F5 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each Company restricted stock unit award, which represented the right to receive one share of Common Stock, that was then outstanding was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, the Offer Price.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 16

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,467 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 15

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 497 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 14

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 364 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 13

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 27,878 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 12

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,121 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 11

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 179 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 10

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 734 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 9

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 135 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 8

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,800 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 7

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 407 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 6

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,002 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 5

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 99 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 4

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,923 shares

Expires not disclosed

F4 · price: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

F4 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of 10 business days prior to the closing of the Merger (the "Acceleration Date"), each Issuer Option then outstanding and unexercised that had an exercise price per Share that was equal to or greater than the Upfront Cash Consideration (each, an "OTM Option"), became fully vested and exercisable up to and through the closing of regular trading on the Nasdaq Stock Market on the fifth business day following the Acceleration Date (the "Last Exercise Date"). OTM Options not exercised on or prior to the Last Exercise Date were cancelled and ceased to exist as of the Effective Time, and no consideration was delivered in exchange for such OTM Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 3

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 26,713 shares

Expires not disclosed

F3 · price: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

F3 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

F3 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · derivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,938 shares

Expires not disclosed

F3 · price: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

F3 · derivative.exercise_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

F3 · derivative.expiration_date: Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock ("Issuer Option") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per Share that was less than the Upfront Cash Consideration (each, a "Cash-Out Option"), became fully vested and was automatically cancelled and converted into the right to receive, without interest and subject to deduction for any required tax withholding, (i) the Offer Price minus (ii) the exercise price payable per share of Common Stock underlying such Cash-Out Option.

SEC source: 0001104659-26-001376 · tm261736-6_4seq1.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Pursuant to the terms of that certain Agreement and Plan of Merger (the "Merger Agreement"), by and among the Issuer, Day One Biopharmaceuticals, Inc. ("Parent") and Parent's direct wholly-owned subsidiary, Emerald Merger Sub, Inc. ("Purchaser"), dated as of November 12, 2025, the shares (the "Shares") of common stock, par value $0.0001 per share, of the Issuer (the "Common Stock") that were tendered to Purchaser prior to the expiration time of the Offer were exchanged for: (i) $25.00 per Share, net to the stockholder in cash, without interest and less any applicable tax withholding (the "Upfront Cash Consideration"), plus (ii) one non-tradeable contingent value right per Share (each, a "CVR"),

F2 · kind: (continued from footnote 1) which represents the right to receive certain contingent milestone payments of up to an aggregate of $30.25 per CVR in cash, without interest and less any applicable tax withholding, upon the achievement of certain specified milestones in accordance with the terms and subject to the conditions of a contingent value rights agreement entered into by Parent and the rights agent (the Upfront Cash Consideration plus one CVR, collectively, the "Offer Price"). After completion of the tender offer, pursuant to the terms of the Merger Agreement, Purchaser merged with and into the Issuer, effective as of January 6, 2026 (the "Effective Time"), with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Parent.

F1 · price: Pursuant to the terms of that certain Agreement and Plan of Merger (the "Merger Agreement"), by and among the Issuer, Day One Biopharmaceuticals, Inc. ("Parent") and Parent's direct wholly-owned subsidiary, Emerald Merger Sub, Inc. ("Purchaser"), dated as of November 12, 2025, the shares (the "Shares") of common stock, par value $0.0001 per share, of the Issuer (the "Common Stock") that were tendered to Purchaser prior to the expiration time of the Offer were exchanged for: (i) $25.00 per Share, net to the stockholder in cash, without interest and less any applicable tax withholding (the "Upfront Cash Consideration"), plus (ii) one non-tradeable contingent value right per Share (each, a "CVR"),

F2 · price: (continued from footnote 1) which represents the right to receive certain contingent milestone payments of up to an aggregate of $30.25 per CVR in cash, without interest and less any applicable tax withholding, upon the achievement of certain specified milestones in accordance with the terms and subject to the conditions of a contingent value rights agreement entered into by Parent and the rights agent (the Upfront Cash Consideration plus one CVR, collectively, the "Offer Price"). After completion of the tender offer, pursuant to the terms of the Merger Agreement, Purchaser merged with and into the Issuer, effective as of January 6, 2026 (the "Effective Time"), with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Parent.

SEC source: 0001104659-25-090026 · tm2526132-1_4seq1.xml · nonDerivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,572

F3 · kind: Represents the sale of shares of common stock to satisfy the Reporting Person's tax withholding obligations in connection with the service-based vesting and settlement of the RSUs pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 7, 2023. The sale was effected through an automatic "sell to cover" transaction that did not represent a discretionary trade by the Reporting Person.

F2 · shares: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

F4 · price: The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $7.22 to $7.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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 ranges set forth in this footnote.

F2 · balance_after: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

SEC source: 0001104659-25-090026 · tm2526132-1_4seq1.xml · derivative · entry 3

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 13,340

Underlying: Common Stock · 20,010 shares

Expires not disclosed

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.

F5 · derivative.exercise_price: Each RSU represents the contingent right to receive one share of common stock of the Issuer.

F2 · shares: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

F6 · derivative.exercise_date: 25% of the total number of RSUs granted vested on September 11, 2025, and the remainder shall vest thereafter in equal annual installments over the next two years.

F6 · derivative.expiration_date: 25% of the total number of RSUs granted vested on September 11, 2025, and the remainder shall vest thereafter in equal annual installments over the next two years.

F2 · derivative.underlying_shares: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

F2 · balance_after: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

SEC source: 0001104659-25-090026 · tm2526132-1_4seq1.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,584

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 · kind: Represents shares of common stock received upon vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on September 11, 2023.

F2 · shares: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

F2 · balance_after: Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025.

SEC source: 0000950170-25-074297 · ownership.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,000

SEC source: 0000950170-25-016351 · ownership.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,000

F1 · shares: Award of Restricted Stock Units that vests one year from the date of grant. The shares underlying such Restricted Stock Units will not be delivered to the Reporting Person and may not be transferred or sold until the earlier of a separation from service, death, disability or change in control.

SEC source: 0001104659-25-004593 · tm253733-4_4seq1.xml · nonDerivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 122,875

F2 · kind: Represents the sale of shares of common stock to satisfy the Reporting Person's tax withholding obligations in connection with the service-based vesting and settlement of the RSUs pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 7, 2023. The sale was effected through an automatic "sell to cover" transaction that did not represent a discretionary trade by the Reporting Person.

F3 · price: The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $0.56 to $0.58, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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 ranges set forth in this footnote.

SEC source: 0001104659-25-004593 · tm253733-4_4seq1.xml · derivative · entry 5

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 181,400

Underlying: Common Stock · 181,400 shares

Expires not disclosed

F4 · derivative.exercise_price: Each RSU represents the contingent right to receive one share of common stock of the Issuer.

F7 · derivative.exercise_date: The RSUs shall vest in equal annual installments over four years from the date of grant.

F7 · derivative.expiration_date: The RSUs shall vest in equal annual installments over four years from the date of grant.

SEC source: 0001104659-25-004593 · tm253733-4_4seq1.xml · derivative · entry 4

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 816,300

Underlying: Common Stock · 816,300 shares

Expires 2035-01-14

F6 · derivative.exercise_date: The option shall vest in equal quarterly installments over four years from the date of grant.

SEC source: 0001104659-25-004593 · tm253733-4_4seq1.xml · derivative · entry 3

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 33,188

Underlying: Common Stock · 11,062 shares

Expires not disclosed

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.

F4 · derivative.exercise_price: Each RSU represents the contingent right to receive one share of common stock of the Issuer.

F5 · derivative.exercise_date: 25% of the total number of RSUs granted vested on January 15, 2025, and the remainder shall vest thereafter in equal annual installments over the next three years.

F5 · derivative.expiration_date: 25% of the total number of RSUs granted vested on January 15, 2025, and the remainder shall vest thereafter in equal annual installments over the next three years.

SEC source: 0001104659-25-004593 · tm253733-4_4seq1.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 127,389

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 · kind: Represents shares of common stock received upon vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on January 15, 2024.

SEC source: 0001104659-24-099855 · tm2424033-2_4seq1.xml · nonDerivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 116,327

F3 · kind: Represents the sale of shares of common stock to satisfy the Reporting Person's tax withholding obligations in connection with the service-based vesting and settlement of the RSUs pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 7, 2023. The sale was effected through an automatic "sell to cover" transaction that did not represent a discretionary trade by the Reporting Person.

F4 · price: The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $1.735 to $1.83, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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 ranges set forth in this footnote.

SEC source: 0001104659-24-099855 · tm2424033-2_4seq1.xml · derivative · entry 3

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 500,250

Underlying: Common Stock · 166,750 shares

Expires not disclosed

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.

F5 · derivative.exercise_price: Each RSU represents the contingent right to receive one share of common stock of the Issuer.

F6 · derivative.exercise_date: 25% of the RSUs granted vested on September 11, 2024, and the remainder shall vest thereafter in equal annual installments over the next three years.

F6 · derivative.expiration_date: 25% of the RSUs granted vested on September 11, 2024, and the remainder shall vest thereafter in equal annual installments over the next three years.

SEC source: 0001104659-24-099855 · tm2424033-2_4seq1.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 166,750

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 · kind: Represents shares of common stock received upon vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on September 11, 2023.

F2 · balance_after: On June 12, 2023, the Reporting Person filed a Form 4 reporting the award of a RSU award representing the right to receive 14,467 shares of common stock of the Issuer on June 8, 2023. Such RSU award was subsequently rescinded in connection with the Reporting Person's appointment as president and chief executive officer effective in September 2023 and as a result was cancelled for no value. The amount of securities beneficially owned reported in this Form 4 reflects an adjustment in the number of shares held by the Reporting Person, reflecting the cancellation of the June 8, 2023 RSU award for no value.

SEC source: 0001562180-24-001220 · primarydocument.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,000

F1 · shares: Award of Restricted Stock Units that vests one year from the date of grant. The shares underlying such Restricted Stock Units will not be delivered to the Reporting Person and may not be transferred or sold until the earlier of a separation from service, death, disability or change in control.

SEC source: 0001104659-24-004545 · tm243529-4_4seq1.xml · derivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,250

Underlying: Common Stock · 44,250 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the contingent right to receive one share of common stock of the Issuer.

F3 · derivative.exercise_date: The RSUs shall vest in equal annual installments over four years from the date of grant.

F3 · derivative.expiration_date: The RSUs shall vest in equal annual installments over four years from the date of grant.

SEC source: 0001104659-24-004545 · tm243529-4_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 199,125

Underlying: Common Stock · 199,125 shares

Expires 2034-01-14

F1 · derivative.exercise_date: The option shall vest in equal quarterly installments over four years from the date of grant.

SEC source: 0001104659-23-106843 · tm2327613-5_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,102

Underlying: Common Stock · 9,102 shares

Expires 2033-10-01

F1 · shares: This stock option was granted in connection with the Reporting Person's election to receive the Reporting Person's quarterly retainer for non-employee director services in the form of stock options rather than cash. The options were granted to the Reporting Person pursuant to the Issuer's Amended & Restated Non-Employee Director Compensation Policy in lieu of retainer fees of $9,557.69 for service as a non-employee director between July 1, 2023 and September 10, 2023 in the quarter ended September 30, 2023.

F2 · derivative.exercise_date: Fully vested as of the date of grant.

SEC source: 0001104659-23-100441 · tm2326002-1_4seq1.xml · derivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 667,000

Underlying: Common Stock · 667,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the contingent right to receive one share of Common Stock of the Issuer.

F3 · derivative.exercise_date: The RSUs shall vest in equal annual installments over four years from the date of grant, subject to the Reporting Person's continuous service to the Issuer through each such vesting date.

F3 · derivative.expiration_date: The RSUs shall vest in equal annual installments over four years from the date of grant, subject to the Reporting Person's continuous service to the Issuer through each such vesting date.

SEC source: 0001104659-23-100441 · tm2326002-1_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director · President, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,000,000

Underlying: Common Stock · 1,000,000 shares

Expires 2033-09-10

F1 · derivative.exercise_date: 25% of the shares subject to the option will vest on the first anniversary of the grant, and the remainder shall vest in 12 equal quarterly installments thereafter, subject to the Reporting Person's continuous service to the Issuer through each such vesting date.

SEC source: 0001415889-23-012415 · form4-08182023_080801.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · PRESIDENT AND HEAD OF R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 136,500

Underlying: Common Stock · 136,500 shares

Expires 2033-08-15

F1 · derivative.exercise_date: The option award was granted on August 16, 2023 and shall vest with respect to 1/3 of the shares of common stock underlying the stock option on the first anniversary of the grant date and with respect to the remaining 2/3 of the shares of common stock underlying the stock option on the second anniversary of the grant date.

SEC source: 0001104659-23-078752 · tm2320657-3_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,477

Underlying: Common Stock · 4,477 shares

Expires 2033-07-02

F1 · shares: This stock option was granted in connection with the Reporting Person's election to receive the Reporting Person's quarterly retainer for director services in the form of stock options rather than cash. The options were granted to the Reporting Person pursuant to the Issuer's Amended & Restated Non-Employee Director Compensation Policy in lieu of retainer fees of $12,250 for the quarter ended June 30, 2023.

F2 · derivative.exercise_date: Fully vested as of the date of grant.

SEC source: 0001104659-23-070362 · tm2318463-4_4seq1.xml · derivative · entry 2

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,355

Underlying: Common Stock · 18,355 shares

Expires 2033-06-07

F2 · derivative.exercise_date: The award will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2024 Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continuous service with the Issuer on such vesting date.

SEC source: 0001104659-23-070362 · tm2318463-4_4seq1.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,467

F1 · shares: Represents a restricted stock unit ("RSU") award. Each RSU represents the contingent right to receive one share of Common Stock of the Issuer.

F2 · shares: The award will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2024 Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continuous service with the Issuer on such vesting date.

SEC source: 0001104659-23-042244 · tm2311858-4_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,375

Underlying: Common Stock · 3,375 shares

Expires 2033-04-02

F1 · shares: This stock option was granted in connection with the Reporting Person's election to receive the Reporting Person's quarterly retainer for director services in the form of stock options rather than cash. The options were granted to the Reporting Person pursuant to the Issuer's Amended & Restated Non-Employee Director Compensation Policy in lieu of retainer fees of $11,000 for the quarter ended March 31, 2023.

F2 · derivative.exercise_date: Fully vested as of the date of grant

SEC source: 0001562180-23-000946 · primarydocument.xml · nonDerivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,000

F1 · shares: Award of Restricted Stock Units that vests one year from the date of grant. The shares underlying such Restricted Stock Units will not be delivered to the Reporting Person and may not be transferred or sold until the earlier of a separation from service, death, disability or change in control.

SEC source: 0001415889-23-000289 · form4-01042023_090139.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · PRESIDENT AND HEAD OF R&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 136,500

Underlying: Common Stock · 136,500 shares

Expires 2032-12-31

F1 · derivative.exercise_date: The option award was granted on January 1, 2023 and shall vest on February 1, 2023 with respect to 1/48th of the shares of common stock underlying the stock option and continue to vest in equal monthly installments thereafter until January 1, 2027.

SEC source: 0001415889-22-006747 · form4-06172022_040644.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · PRESIDENT AND HEAD OF R&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Common Stock · 20,000 shares

Expires 2032-06-14

F1 · derivative.exercise_date: The option award was granted on June 15, 2022 and will vest in equal monthly installments until June 15, 2026, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0001415889-22-006908 · form4a-06232022_070602.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · PRESIDENT AND HEAD OF R&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Common Stock · 20,000 shares

Expires 2032-06-14

F1 · derivative.exercise_date: The option award was granted on June 15, 2022 and shall vest on July 1, 2022 with respect to 1/48th of the shares of common stock underlying the stock option and continue to vest in equal monthly installments thereafter until June 1, 2026.

SEC source: 0001104659-22-070138 · tm2218135-2_4seq1.xml · derivative · entry 1

Huber Martin H. Jr. · CIK 0001653276 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

Underlying: Common Stock · 45,000 shares

Expires 2032-06-08

F1 · derivative.exercise_date: The option will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2023 Annual Meeting of Stockholders of Mersana Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.