ATEN

SEC source: 0001580808-21-000002 · wf-form4_161013995374695.xml · nonDerivative · entry 1

Becker Brian · CIK 0001826095 · Interim CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,528

F1 · kind: 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: 0001580808-20-000143 · wf-form4_160937260507733.xml · nonDerivative · entry 1

Dotz Mary · CIK 0001314205 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,299

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-third (1/3) of the total RSUs will vest on each of the first three (3) anniversaries of the Vesting Commencement Date (12/28/2020), provided that the Reporting Person continues to serve through each such vesting date.

SEC source: 0001580808-20-000139 · wf-form4_160927820949152.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,543

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $9.83 to $10.25 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: 0001580808-20-000133 · wf-form4_160754872221015.xml · nonDerivative · entry 1

Trivedi Dhrupad · CIK 0001570462 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 114,111

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: 0001580808-20-000127 · wf-form4_160633856110932.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 138,543

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $8.20 to $8.28 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: 0001580808-20-000125 · wf-form4_160504264125678.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 141,543

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: 0001580808-20-000119 · wf-form4_160384358674362.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 144,158

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.96 to $7.10 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: 0001580808-20-000107 · wf-form4_160331199390554.xml · derivative · entry 1

Becker Brian · CIK 0001826095 · Interim CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,250

Underlying: Common Stock · Not disclosed shares

Expires 2024-10-19

F1 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

F2 · derivative.exercise_date: Grant of 10,000 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between October 19, 2020 and October 19, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments beginning on the date of achievement of the milestone and the balance on each of the first and second anniversaries of the corresponding performance milestone.

SEC source: 0001580808-20-000101 · wf-form4_160106483666769.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,158

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.58 to $6.76 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: 0001580808-20-000091 · wf-form4_159916424208980.xml · nonDerivative · entry 2

Singer Eric · CIK 0001443284 · Director · 10% owner

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · 10% owner

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · 10% owner

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · 10% owner

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · 10% owner

VIEX GP, LLC · CIK 0001654852 · 10% owner

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · 10% owner

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · 10% owner

VIEX Capital Advisors, LLC · CIK 0001619125 · 10% owner

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 One

Disclosed balance after: 1,465,781

F4 · shares: Represents a distribution of shares of the Issuer from Series One to a limited partner of Series One.

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: 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.

F5 · ownership.nature: Securities of the Issuer beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. 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 One.

SEC source: 0001580808-20-000089 · wf-form4_159838956224241.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,158

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $8.08 to $8.54 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: 0001580808-20-000087 · wf-form4_159665835222629.xml · nonDerivative · entry 2

Singer Eric · CIK 0001443284 · Director · 10% owner

VIEX Opportunities Fund, LP Series One · CIK 0001606750 · 10% owner

VIEX Opportunities Fund, LP - Series Two · CIK 0001659404 · 10% owner

VIEX Special Opportunities Fund II, LP · CIK 0001619127 · 10% owner

VIEX Special Opportunities Fund III, LP · CIK 0001619126 · 10% owner

VIEX GP, LLC · CIK 0001654852 · 10% owner

VIEX Special Opportunities GP II, LLC · CIK 0001658891 · 10% owner

VIEX Special Opportunities GP III, LLC · CIK 0001676049 · 10% owner

VIEX Capital Advisors, LLC · CIK 0001619125 · 10% owner

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 One

Disclosed balance after: 1,534,598

F3 · shares: Represents a distribution of shares of the Issuer from Series One to a limited partner of Series One for no consideration.

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 Mr. Singer (collectively, the "Reporting Persons").

F4 · ownership.nature: Securities of the Issuer beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. 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 One.

F5 · 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 the inclusion of these shares in 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: 0001580808-20-000082 · wf-form4_159597795029377.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 153,158

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $7.26 to $7.44 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: 0001580808-20-000065 · wf-form4_159417129322399.xml · nonDerivative · entry 2

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 213,252

F2 · 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: 0001580808-20-000065 · wf-form4_159417129322399.xml · derivative · entry 3

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,286

Underlying: Common Stock · 56,286 shares

Expires 2024-07-02

F3 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

F4 · derivative.exercise_date: Grant of 56,286 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between July 2, 2020 and July 2, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments beginning on the date of achievement of the milestone and the balance on each of the first and second anniversaries of the corresponding performance milestone.

SEC source: 0001580808-20-000065 · wf-form4_159417129322399.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 228,874

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 (04/01/2020), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001580808-20-000061 · wf-form4_159417112858052.xml · derivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,403

Underlying: Common Stock · 61,403 shares

Expires 2024-07-02

F3 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

F4 · derivative.exercise_date: Grant of 61,403 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified,levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between July 2, 2020 and July 2, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments beginning on the date of achievement of the milestone and the balance on each of the first and second anniversaries of the corresponding performance milestone.

SEC source: 0001580808-20-000061 · wf-form4_159417112858052.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 227,529

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 (4/1/2020), provided that the Reporting Person continues to serve through each vesting date.

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

SEC source: 0001580808-20-000063 · wf-form4_159417119329140.xml · derivative · entry 2

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,935

Underlying: Common Stock · 40,935 shares

Expires 2024-07-02

F3 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

F4 · derivative.exercise_date: Grant of 40,935 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between July 2, 2020 and July 2, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments beginning on the date of achievement of the milestone and the balance on each of the first and second anniversaries of the corresponding performance milestone.

SEC source: 0001580808-20-000063 · wf-form4_159417119329140.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 156,158

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 (4/1/2020), provided that the Reporting Person continues to serve through each vesting date.

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

SEC source: 0001580808-20-000059 · wf-form4_159304499786894.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 137,797

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.89 to $7.02 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: 0001179110-20-006675 · edgar.xml · nonDerivative · entry 1

SUMMIT PARTNERS L P · CIK 0000830588 · Director · 10% owner · Manager of 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 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 Investors I, LLC · CIK 0001435565 · Director · 10% owner

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

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

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

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: 9,560,941

F1 · shares: Represents restricted stock units ("RSUs") of the Issuer granted to Mr. Chung as part of the Issuer's director compensation program. The RSUs will settle solely by delivery of an equal number of shares of the Issuer's common stock, par value $0.00001 per share ("Common Stock") on the earlier of the first anniversary of the grant date or the date of the 2021 annual meeting of stockholders of the Issuer, subject to the Reporting Person's continued service on the Issuer's board of directors as of such date. Mr. Chung holds any RSUs for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares of Common Stock 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.; 133,095 shares (including shares underlying RSUs) in the name of Mr. 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 Mr. Chung, has voting and dispositive authority over the shares of Common Stock held by each of the entities described in the foregoing footnotes (2) and (3) 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, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock (including shares underlying RSUs) reported herein, except to the extent of their pecuniary interest therein.

SEC source: 0001580808-20-000057 · wf-form4_159070385739814.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,190

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.

F2 · 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: 0001179110-20-006674 · 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: 9,560,941

F1 · shares: Represents restricted stock units ("RSUs") of the Issuer granted to Mr. Chung as part of the Issuer's director compensation program. The RSUs will settle solely by delivery of an equal number of shares of the Issuer's common stock, par value $0.00001 per share ("Common Stock") on the earlier of the first anniversary of the grant date or the date of the 2021 annual meeting of stockholders of the Issuer, subject to the Reporting Person's continued service on the Issuer's board of directors as of such date. Mr. Chung holds any RSUs for the benefit of Summit Partners, L.P., which he has empowered to determine when the underlying shares of Common Stock 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.; 133,095 shares (including shares underlying RSUs) in the name of Mr. 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 Mr. Chung, has voting and dispositive authority over the shares of Common Stock held by each of the entities described in the foregoing footnotes (2) and (3) 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, Mr. Mannion and Mr. Chung disclaims beneficial ownership of the shares of Common Stock (including shares underlying RSUs) reported herein, except to the extent of their pecuniary interest therein.

SEC source: 0001580808-20-000053 · wf-form4_159070366030366.xml · nonDerivative · entry 1

DODSON J MICHAEL · CIK 0001231559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,245

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: 0001580808-20-000055 · wf-form4_159070375801795.xml · nonDerivative · entry 1

Braham Tor · CIK 0001586400 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 118,609

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: 0001580808-20-000040 · wf-form4_159052398448967.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 140,797

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.59 to $6.76 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: 0001193805-20-000614 · e619650_4-lee.xml · derivative · entry 3

CHEN LEE · CIK 0001206124 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 282,500 shares

Expires 2020-05-31

F3 · security: Represents fully vested stock options.

F4 · kind: Pursuant to the Repurchase Agreement, in addition to the purchase and sale of common stock referenced in footnote 1, the Reporting Person agreed to cancel such options in exchange for the payment by the Issuer to the Reporting Person of $135,600.

F4 · derivative.exercise_date: Pursuant to the Repurchase Agreement, in addition to the purchase and sale of common stock referenced in footnote 1, the Reporting Person agreed to cancel such options in exchange for the payment by the Issuer to the Reporting Person of $135,600.

F5 · derivative.expiration_date: Following Reporting Person's separation from service, the stock options expire if not exercised by May 31, 2020.

SEC source: 0001193805-20-000614 · e619650_4-lee.xml · nonDerivative · entry 1

CHEN LEE · CIK 0001206124 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,670,224

F1 · price: The Issuer and Reporting Person entered into a Common Stock Repurchase and Option Exchange Agreement (the "Repurchase Agreement") for the purchase by the Issuer, and sale by the Reporting Person, of 2,200,000 shares of the Issuer's common stock in a privately-negotiated transaction for an aggregate purchase price of $13,200,000.

SEC source: 0001580808-20-000031 · wf-form4_158897184191924.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 204,752

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: 0001580808-20-000033 · wf-form4_158897193178606.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 199,714

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: 0001580808-20-000032 · wf-form4_158897188606508.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 143,797

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: 0001580808-20-000021 · wf-form4_158836857280760.xml · derivative · entry 2

BRUENING MATTHEW P · CIK 0001188611 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2024-04-29

F2 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU")

F3 · derivative.exercise_date: Grant of 100,000 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between April 29, 2020 and April 29, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments on beginning of the first anniversary of the corresponding performance milestone.

SEC source: 0001580808-20-000021 · wf-form4_158836857280760.xml · nonDerivative · entry 1

BRUENING MATTHEW P · CIK 0001188611 · EVP, Worldwide Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,000

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 (5/5/2020), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001580808-20-000017 · wf-form4_158810517908395.xml · nonDerivative · entry 1

Constantino Thomas · CIK 0001708390 · EVP, Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 207,329

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: 0001580808-20-000016 · wf-form4_158810511642012.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 202,360

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: 0001580808-20-000018 · wf-form4_158810523176349.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 145,686

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: 0001720596-20-000006 · wf-form4_158801925754737.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,225

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $6.30 to $6.42 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: 0001720596-20-000005 · wf-form4_158751125404576.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,225

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 $6.55 to $6.58 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: 0001720596-20-000003 · wf-form4_158534046733197.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 152,426

SEC source: 0001209191-20-012960 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 155,426

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: This is the weighted average price of the shares sold, which ranged from $7.01 to $7.26 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: 0001209191-20-011031 · doc4.xml · nonDerivative · entry 1

Reiss Gunter · CIK 0001720596 · VP Worldwide Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 158,426

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: 0001209191-20-009609 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 205,782

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

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

SEC source: 0001209191-20-007241 · doc4.xml · nonDerivative · entry 1

DODSON J MICHAEL · CIK 0001231559 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,779

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). One-third (1/3) of the total RSUs will vest on each of the first three (3) anniversaries of the Vesting Commencement Date (2/4/2020), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001209191-20-002495 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,915

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: 0001209191-19-060614 · doc4.xml · derivative · entry 2

Trivedi Dhrupad · CIK 0001570462 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 375,000

Underlying: Common Stock · 375,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

F3 · derivative.exercise_date: The PSUs will become eligible to vest upon the achievement of certain stock price targets, as well as the Reporting Person's continued service to the Company, as previously disclosed in the Issuer's Current Report on Form 8-K that was filed with the U.S. Securities and Exchange Commission on November 21, 2019.

F3 · derivative.expiration_date: The PSUs will become eligible to vest upon the achievement of certain stock price targets, as well as the Reporting Person's continued service to the Company, as previously disclosed in the Issuer's Current Report on Form 8-K that was filed with the U.S. Securities and Exchange Commission on November 21, 2019.

SEC source: 0001209191-19-060614 · doc4.xml · nonDerivative · entry 1

Trivedi Dhrupad · CIK 0001570462 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

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 (12/5/2019), provided that the Reporting Person continues to serve through each vesting date.

SEC source: 0001179110-19-012507 · edgar.xml · nonDerivative · entry 1

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

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

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

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes.

Disclosed balance after: 9,539,076

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.; 111,230 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: 0001179110-19-012509 · 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: 9,539,076

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.; 111,230 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: 0001209191-19-059502 · doc4.xml · nonDerivative · entry 1

Singer Eric · CIK 0001443284 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,969

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.