ATEN

SEC source: 0001209191-19-059501 · doc4.xml · nonDerivative · entry 1

SALSBURY PHILLIP J · CIK 0001358689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 176,230

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-19-059500 · doc4.xml · nonDerivative · entry 1

Henricks Alan S. · CIK 0001513957 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 88,640

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-19-059499 · doc4.xml · nonDerivative · entry 1

Braham Tor · CIK 0001586400 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,744

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 16

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Opportunities Fund, LP - Series Two

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 150,900 shares

Expires 2019-11-15

F9 · kind: Shares of Common Stock of the Issuer beneficially owned directly by Series Two or options sold by Series Two. The transaction reported herein represents the exercise on November 15, 2019 of 1,509 call option contracts sold by Series Two, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F10 · ownership.nature: Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 15

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund III, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 5,800 shares

Expires 2019-11-15

F7 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F8 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 14

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund III, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 210,500 shares

Expires 2019-11-15

F7 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F8 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 13

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 150,000 shares

Expires 2019-11-15

F6 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 12

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 5,900 shares

Expires 2019-11-15

F6 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 11

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 132,800 shares

Expires 2019-11-15

F5 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 1,328 put option contracts on November 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 7

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Opportunities Fund, LP - Series Two

Disclosed balance after: 482,877

F9 · kind: Shares of Common Stock of the Issuer beneficially owned directly by Series Two or options sold by Series Two. The transaction reported herein represents the exercise on November 15, 2019 of 1,509 call option contracts sold by Series Two, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by Series Two.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F10 · ownership.nature: Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 6

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund III, LP

Disclosed balance after: 487,416

F7 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

F8 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 5

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund III, LP

Disclosed balance after: 276,916

F7 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO III or options sold by VSO III. The transactions reported herein represent the exercises on November 15, 2019 of (i) 2,105 call option contracts sold by VSO III, and (ii) 58 call option contracts sold by VSO III, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO III.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 4

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 5,255,022

F6 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 3

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 5,105,022

F6 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises on November 15, 2019 of (i) 1,500 call option contracts sold by VSO II, and (ii) 59 call option contracts sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such call options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 2

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 5,099,122

F5 · kind: Shares of Common Stock of the Issuer beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 1,328 put option contracts on November 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · derivative · entry 10

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 1,328

Underlying: Common Stock, par value $0.00001 · 67,200 shares

Expires 2019-11-15

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 672 put option contracts on November 14, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F12 · derivative.exercise_date: These options were exercisable when exercised.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-056945 · doc4.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 4,966,322

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 672 put option contracts on November 14, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-055805 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 161,742

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · balance_after: Includes shares acquired by the Reporting Person pursuant to the Issuer's Employee Stock Purchase Plan.

SEC source: 0001209191-19-046654 · doc4.xml · derivative · entry 7

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 111,700 shares

Expires 2019-08-16

F9 · kind: Put options expired on August 16, 2019.

F9 · derivative.exercise_date: Put options expired on August 16, 2019.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046654 · doc4.xml · derivative · entry 6

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 0

Underlying: Common Stock, par value $0.00001 · 1,104,800 shares

Expires 2019-08-16

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 11,048 put option contracts on August 16, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F8 · derivative.exercise_date: These options are currently exercisable.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046654 · doc4.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 4,899,122

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transaction reported herein represent the exercise of 11,048 put option contracts on August 16, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046403 · doc4.xml · derivative · entry 8

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 11,048

Underlying: Common Stock, par value $0.00001 · 217,900 shares

Expires 2019-08-16

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F8 · derivative.exercise_date: These options are currently exercisable.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046403 · doc4.xml · nonDerivative · entry 2

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 3,794,322

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046403 · doc4.xml · derivative · entry 7

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 13,227

Underlying: Common Stock, par value $0.00001 · 45,200 shares

Expires 2019-08-16

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F8 · derivative.exercise_date: These options are currently exercisable.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-19-046403 · doc4.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · Director

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · Director

VIEX GP, LLC · CIK 0001654852 · Director

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · Director

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · Director

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · Director

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · Director

VIEX Capital Advisors, LLC · CIK 0001619125 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Viex Special Opportunities Fund II, LP

Disclosed balance after: 3,576,422

F1 · kind: Shares of Common Stock of A10 Networks, Inc. (the "Issuer") beneficially owned directly by VSO II or options sold by VSO II. The transactions reported herein represent the exercises of (i) 452 put option contracts on August 14, 2019 and (ii) 2,179 put option contracts on August 15, 2019 sold by VSO II, each contract representing 100 shares of Issuer Common Stock, by the counterparty and the acquisition of the shares underlying such put options by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the shares of Common Stock of the Issuer beneficially owned by VSO II.

F2 · ownership.nature: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

F3 · ownership.nature: Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.

F4 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0000921895-19-002071 · form410114025_07302019.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · See Explanation of Responses

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · See Explanation of Responses

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · See Explanation of Responses

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · See Explanation of Responses

VIEX GP, LLC · CIK 0001654852 · See Explanation of Responses

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · See Explanation of Responses

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · See Explanation of Responses

VIEX Capital Advisors, LLC · CIK 0001619125 · See Explanation of Responses

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,120

F2 · balance_after: Each share is represented by a restricted stock unit, which vests in three equal annual installments on the anniversary of the grant date of 07/26/2019, provided that the Reporting Person continues to serve through each vesting date.

F1 · ownership.direct: This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").

SEC source: 0001209191-19-041566 · doc4.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 210,816

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.95 to $6.9843 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-19-026838 · doc4.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 226,308

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-19-026836 · doc4.xml · nonDerivative · entry 1

COCHRAN ROBERT D · CIK 0001358721 · EVP Legal & Corp Collaboration

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 212,560

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-19-026839 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 163,533

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-19-025812 · doc4.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 229,912

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (5/5/2019), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-19-025811 · doc4.xml · nonDerivative · entry 1

COCHRAN ROBERT D · CIK 0001358721 · EVP Legal & Corp Collaboration

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 216,095

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (5/5/2019), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-19-025815 · doc4.xml · nonDerivative · entry 1

White Christopher P. · CIK 0001726563 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,084

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (5/5/2019), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-19-025814 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 166,121

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (5/5/2019), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-19-025543 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 144,647

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-19-011743 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 145,807

F1 · shares: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-19-002788 · doc4.xml · nonDerivative · entry 1

White Christopher P. · CIK 0001726563 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,020

F1 · shares: Represents the number of shares automatically sold to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001179110-18-012729 · edgar.xml · nonDerivative · entry 1

SUMMIT PARTNERS L P · CIK 0000830588 · Director · 10% owner · Manager of GP of 10% owner

SUMMIT MASTER COMPANY, LLC · CIK 0001627278 · Director · Manager of Manager of 10% owne

SUMMIT PARTNERS GE VIII, L.P. · CIK 0001593029 · Director · GP of 10% owner

Summit Partners GE VIII, LLC · CIK 0001593948 · Director · GP of 10% owner

Summit Partners Growth Equity Fund VIII-A, L.P. · CIK 0001514386 · Director · 10% owner

Summit Partners Growth Equity Fund VIII-B, L.P. · CIK 0001514388 · Director · 10% owner

Summit Investors Management, LLC · CIK 0001507545 · Director · Manager and GP of 10% Owner

Summit Investors I, LLC · CIK 0001435565 · Director · 10% owner

Summit Investors I (UK), L.P. · CIK 0001494616 · Director · 10% owner

MANNION MARTIN J · CIK 0001018067 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes.

Disclosed balance after: 9,515,529

F1 · shares: Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will settle solely by delivery of an equal number of shares of Common Stock on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service on the board of directors as of such date. Mr. Chung holds any restricted stock units for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales.

F2 · balance_after: The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 87,683 shares and restricted stock units in the name of Peter Y. Chung, which are held for the benefit of Summit Partners, L.P.

F3 · ownership.nature: Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer.

F4 · ownership.nature: Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities mentioned herein, Summit Partners, L.P., Summit Master Company, LLC, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock and the restricted stock units, except to the extent of their pecuniary interest therein.

SEC source: 0001179110-18-012728 · edgar.xml · nonDerivative · entry 1

CHUNG PETER Y · CIK 0001239366 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes.

Disclosed balance after: 9,515,529

F1 · shares: Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will settle solely by delivery of an equal number of shares of Common Stock on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service on the board of directors as of such date. Mr. Chung holds any restricted stock units for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares will be sold and which is entitled to the proceeds of any such sales.

F2 · balance_after: The Common Stock is held as follows: 6,873,136 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 40,186 shares in the name of Summit Investors I, LLC; 3,535 shares in the name of Summit Investors I (UK), L.P.; 87,683 shares and restricted stock units in the name of Peter Y. Chung, which are held for the benefit of Summit Partners, L.P.

F3 · ownership.nature: Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Issuer.

F4 · ownership.nature: Summit Partners, L.P., through a two-person Investment Committee responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares held by each of these entities and therefore may be deemed to beneficially own such shares. In addition, Mr. Chung is a member of Summit Master Company, LLC. Each of the Summit entities mentioned herein, Summit Partners, L.P., Summit Master Company, LLC, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock and the restricted stock units, except to the extent of their pecuniary interest therein.

SEC source: 0001209191-18-057981 · doc4.xml · nonDerivative · entry 1

SALSBURY PHILLIP J · CIK 0001358689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 152,683

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-18-057980 · doc4.xml · nonDerivative · entry 1

Henricks Alan S. · CIK 0001513957 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,093

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-18-057978 · doc4.xml · nonDerivative · entry 1

Braham Tor · CIK 0001586400 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,197

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's next Annual Meeting, subject to the Reporting Person's continued service as of such date.

SEC source: 0001209191-18-057623 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,016

F1 · shares: Represents the number of shares automatically sold to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-18-056002 · doc4.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 199,848

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (4/26/2018), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-18-056003 · doc4.xml · nonDerivative · entry 1

COCHRAN ROBERT D · CIK 0001358721 · Director · EVP Legal & Corp Collaboration

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 195,844

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (4/26/2018), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-18-056005 · doc4.xml · derivative · entry 2

White Christopher P. · CIK 0001726563 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 316,742

Underlying: Common Stock · 316,742 shares

Expires 2028-10-22

F2 · derivative.exercise_date: One-fourth (1/4) of the shares subject to the option will vest on the first anniversary of the Vesting Commencement Date (1/5/2018), and the remaining shares will vest in equal monthly installments over the following 36 months, provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-18-056005 · doc4.xml · nonDerivative · entry 1

White Christopher P. · CIK 0001726563 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,323

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (1/5/2018), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-18-056004 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 158,382

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (4/26/2018), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-18-055715 · doc4.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 159,871

F1 · shares: Represents the number of shares automatically sold to cover tax withholding obligations in connection with the vesting of restricted stock units.

SEC source: 0001209191-18-055717 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Mktg & Bus Dev

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 129,632

F1 · shares: Represents the number of shares automatically sold to cover tax withholding obligations in connection with the vesting of restricted stock units.