Dean Thompson

Row 1 · Balance 831,596

Row 2 · Balance 90,540

Row 2 · 2024-06-29 · Exercise / conversion · Acquired 66,668 · Balance 15,992,372

F17: Represents stock options exercised on a net share settlement basis. Accordingly, the Issuer is delivering an aggregate 7,111 shares of common stock to the Reporting Persons in connection with the option exercises, with no shares being sold externally.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 3 · 2024-06-29 · Tax withholding · Disposed 59,557 · Balance 15,862,815

F18: Represents the number of shares withheld by the Issuer to satisfy (i) the aggregate exercise price for the options and (ii) withholding taxes related to such exercise. No shares were sold by the Reporting Persons to satisfy the exercise price of the stock options.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 1 · Balance 15,855,704

F7: In accordance with the letter agreement, dated March 23, 2022, by and among the Issuer, Avista Acquisition LP II, a Cayman Islands limited partnership ("Avista Sponsor"), and other parties (the "Letter Agreement"), if the Triggering Event (as defined in the Letter Agreement) has not occurred during the Earnout Period (as defined in the Letter Agreement), 1,293,299 shares of common stock will be automatically forfeited to the Issuer for no consideration.

F8: As a result of the liquidation and distribution of all of the assets of the Avista Sponsor to its limited partners, ACP V Onshore and ACP V Offshore (the "Avista Sponsor Liquidating Distribution"), and pursuant to a Joinder to the Letter Agreement entered into on December 9, 2022 between ACP V Onshore, ACP V Offshore, Avista Sponsor and the Issuer, ACP V Onshore directly holds 595,508 of the shares of common stock subject to forfeiture pursuant to the terms of the Letter Agreement, and ACP V Offshore holds 697,791 of the shares of common stock subject to forfeiture pursuant to the terms of the Letter Agreement.

F9: Additionally, in connection with the Avista Sponsor Liquidating Distribution, each of ACP V Onshore and ACP V Offshore provided to the Issuer an agreement stating that they will each be bound by the transfer restrictions included in the Amended and Restated Registration and Stockholder Rights Agreement, dated as of November 1, 2022, among the Issuer, the Sponsor and the other signatories thereto (the "A&R RSRA") for the duration of the Founder Shares Lock Up Period (as defined in the A&R RSRA).

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 4 · 2024-06-28 · Disposition to issuer · Disposed 20,000 · Balance 0

F5: Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest in full on the earlier of (i) the date of the next annual meeting of the Company's stockholders following the grant date and (ii) the first anniversary of the grant date.

F15: Represents the number of unvested RSUs forfeited in connection with Mr. Tamaroff's resignation as a director of the Issuer.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 5 · 2024-06-28 · Disposition to issuer · Disposed 35,538 · Balance 0

F4: Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. Vesting occurs in three substantially equal annual installments, beginning November 1, 2023.

F15: Represents the number of unvested RSUs forfeited in connection with Mr. Tamaroff's resignation as a director of the Issuer.

F10: Represents restricted stock units ("RSUs") granted to Mr. Tamaroff in his capacity as a director of the Issuer, which RSUs vest as to the shares underlying the award in three substantially similar annual installments beginning on November 1, 2023, subject to Mr. Tamaroff's continuing service as a director of the Issuer through the applicable vesting date; provided, that the RSUs shall vest in full (i) in the event of a Change of Control (as defined in the Issuer's 2022 Incentive Award Plan), to the extent Mr. Tamaroff is serving as a director at the time of such transaction, or (ii) in the event that Mr. Tamaroff ceases to serve as a director by reason of death or Permanent Disability (as defined in the Issuer's 2022 Incentive Award Plan). Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 6 · 2024-06-28 · Disposition to issuer · Disposed 40,000 · Balance 0

F16: Represents the number of unvested stock options forfeited in connection with Mr. Tamaroff's resignation as a director of the Issuer.

F6: Represents stock options granted to Mr. Tamaroff in his capacity as a director of the Issuer, which stock options vest and become exercisable in full on the earlier of (i) the date of the next annual meeting of the Company's stockholders following the grant date and (ii) the first anniversary of the grant date.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 8 · 2024-06-28 · Disposition to issuer · Disposed 133,333 · Balance 66,668

F16: Represents the number of unvested stock options forfeited in connection with Mr. Tamaroff's resignation as a director of the Issuer.

F14: Represents stock options granted to Mr. Tamaroff in his capacity as a director of the Issuer, which stock options vest in three substantially similar annual installments beginning on November 1, 2023. The Form 4s filed by the Reporting Persons on December 5, 2022 and December 13, 2022 incorrectly reported that 161,849 stock options and 161,849 shares of common stock underlying such stock options were issued to Mr. Tamaroff.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 7 · Balance 40,000

F6: Represents stock options granted to Mr. Tamaroff in his capacity as a director of the Issuer, which stock options vest and become exercisable in full on the earlier of (i) the date of the next annual meeting of the Company's stockholders following the grant date and (ii) the first anniversary of the grant date.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F11: Mr. Tamaroff, in his capacity as a partner at an affiliate of the Avista Affiliates, had previously assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore were each "directors by deputization" for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.

Row 9 · Balance 11,345,489

F12: In connection with the completion of the Issuer's August 2021 initial public offering, Avista Sponsor purchased 8,233,333 warrants in a private placement from the Issuer, each exercisable to purchase (subject, initially, to the satisfaction of certain material conditions) one share of common stock for $11.50 per share. The material conditions to exercise were satisfied upon the closing of the transactions contemplated by the Agreement and Plan of Merger, dated March 23, 2022, by and among the Issuer, Avista Sponsor and other parties (the "Closing"), and the warrants by their terms became exercisable (including by cash settlement) on December 1, 2022.

F13: In connection with the Amended and Restated Forward Purchase Agreement, dated March 23, 2022, by and among the Issuer, Avista Sponsor and other parties (the "A&R Forward Purchase Agreement"), Avista Sponsor purchased an aggregate 3,112,156 warrants in private placements from the Issuer, each exercisable to purchase (subject, initially, to the satisfaction of certain material conditions) one share of common stock for $11.50 per share. The material conditions to exercise were satisfied on the Closing, and the warrants by their terms became exercisable (including by cash settlement) December 31, 2022.

F1: This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership ("ACP V Onshore"), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership ("ACP V Offshore"), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership ("ACP V GP"), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company ("Avista Managing Member"), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the "Avista Affiliates"), and (vi) Joshua Tamaroff, who is a former director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the "Issuer").

F2: Mr. Tamaroff resigned as a director of the Issuer, effective as of June 28, 2024. As a result, Mr. Tamaroff is no longer subject to Section 16 reporting in connection with the securities of the Issuer.

F3: ACP V Onshore directly holds 7,296,895 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,565,920 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.

Row 1 · Balance 2,178,317

F1: Represents shares of common stock directly held by Thompson Dean.

F6: Because of the relationship among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests. Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.

F7: Pursuant to Rule 16a-1(a)(4) under the Exchange Act, this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.

Row 2 · Balance 1,555,704

F2: Represents shares of common stock directly held by David Burgstahler.

F6: Because of the relationship among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests. Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.

F7: Pursuant to Rule 16a-1(a)(4) under the Exchange Act, this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.

Row 3 · Balance Not disclosed

F4: The Convertible Preferred Stock is convertible at the option of a holder at any time into shares of common stock of the Issuer at an initial implied conversion price of $3.7917 per share; provided, however, the maximum number of shares of common stock issuable upon conversion of the Convertible Preferred Stock prior to receipt by the Issuer of stockholder approval (the "Requisite Stockholder Approval"), as contemplated by Nasdaq listing rules, is an aggregate of 26,502,042 shares of common stock (the "Share Cap"), and until the Requisite Stockholder Approval is obtained, no person or group of persons may beneficially own shares of common stock issuable upon conversion of the Convertible Preferred Stock in an amount greater than 19.99% of the then-outstanding shares of common stock.. The Convertible Preferred Stock has no expiration date.

F5: Represents the number of shares of the Issuer's common stock that the Convertible Preferred Stock held by AHP III and AHP III Orchestra is currently convertible into due to the Share Cap.

F3: Avista Healthcare Partners III, L.P. ("AHP III") directly owns 65,750 shares of the Issuer's Series A Convertible Preferred Stock, par value $0.0001 per share (the "Convertible Preferred Stock"), and AHP III Orchestra Holdings, L.P. ("AHP III Orchestra") directly owns 64,250 shares of Convertible Preferred Stock. Avista Capital Partners VI GP, L.P. ("ACP VI GP") is the general partner of each of AHP III and AHP III Orchestra, and Avista Capital Managing Member VI, LLC ("Avista Managing Member") is the general partners of ACP VI GP. Thompson Dean and David Burgstahler are the managers of Avista Managing Member.

F6: Because of the relationship among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests. Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.

F7: Pursuant to Rule 16a-1(a)(4) under the Exchange Act, this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.