Weber Robert Scott

SEC source: 0001936128-26-000027 · wk-form4_1786566343.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 50,586

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 9, 2026.

F2 · price: This is the weighted average price of the shares sold, which ranged from $27.55 to $28.46 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: 0001936128-26-000024 · wk-form4_1783374408.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,672

F1 · shares: Shares withheld, on a non-discretionary basis, for tax purposes related to a July 1, 2022 restricted stock unit grant that vested on July 5, 2026.

F2 · balance_after: Includes 1,042 shares acquired by the Reporting Person on May 31, 2026 pursuant to the Issuer's Employee Stock Purchase Plan.

SEC source: 0001936128-26-000021 · wk-form4a_1778887018.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,527

F1 · price: This amendment to the original Form 4 filed on May 15, 2026 is being filed to correct the price reported in Column 4 of Table I in connection with the shares withheld, on a non-discretionaly basis, for tax purposes related to a February 6, 2025 performance-based restricted stock unit grant and a February 12, 2026 performance-based restricted stock unti grant, each that vested on May 14, 2026.

SEC source: 0001936128-26-000019 · wk-form4_1778881847.xml · nonDerivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,527

F3 · shares: Includes 987 shares and 943 shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 6, 2025 performance-based restricted stock unit grant and a February 12, 2026 performance-based restricted stock unit grant, respectively, each that vested on May 14, 2026.

SEC source: 0001936128-26-000019 · wk-form4_1778881847.xml · derivative · entry 5

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,882 shares

Expires 2029-02-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The second achievement date occurred on May 6, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of May 6, 2026, subject to continued employment. These shares are reflected on Table I.

F2 · derivative.exercise_date: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The second achievement date occurred on May 6, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of May 6, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000019 · wk-form4_1778881847.xml · derivative · entry 4

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,706 shares

Expires 2030-02-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The second achievement date occurred on April 27, 2026, as certified by the compensation committee of ATEN, resulting in 3,706 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 27, 2026, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The second achievement date occurred on April 27, 2026, as certified by the compensation committee of ATEN, resulting in 3,706 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 27, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000019 · wk-form4_1778881847.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,457

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The second achievement date occurred on May 6, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of May 6, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000019 · wk-form4_1778881847.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,575

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The second achievement date occurred on April 27, 2026, as certified by the compensation committee of ATEN, resulting in 3,706 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 27, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000017 · wk-form4_1778117363.xml · nonDerivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,869

F3 · shares: Includes 987 shares and 943 shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 6, 2025 performance-based restricted stock unit grant and a February 12, 2026 performance-based restricted stock unit grant, respectively, each that vested on May 5, 2026.

SEC source: 0001936128-26-000017 · wk-form4_1778117363.xml · derivative · entry 5

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,706

Underlying: Common Stock · 3,707 shares

Expires 2030-02-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The first achievement date occurred on April 22, 2026, as certified by the compensation committee of ATEN, resulting in 3,707 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 22, 2026, subject to continued employment. These shares are reflected on Table I.

F2 · derivative.exercise_date: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The first achievement date occurred on April 22, 2026, as certified by the compensation committee of ATEN, resulting in 3,707 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 22, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000017 · wk-form4_1778117363.xml · derivative · entry 4

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,882

Underlying: Common Stock · 3,882 shares

Expires 2029-02-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The first achievement date occurred on April 16, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 16, 2026, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The first achievement date occurred on April 16, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 16, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000017 · wk-form4_1778117363.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,799

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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 trading period between February 12, 2026 and February 12, 2030. The first achievement date occurred on April 22, 2026, as certified by the compensation committee of ATEN, resulting in 3,707 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 22, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000017 · wk-form4_1778117363.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,092

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 trading period between February 6, 2025 and February 6, 2029. The first achievement date occurred on April 16, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 5, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 16, 2026, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001936128-26-000015 · wk-form4_1772571976.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,210

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to performance-based restricted stock units granted on February 21, 2023, which vested on February 28, 2026.

SEC source: 0001936128-26-000011 · wk-form4_1771021608.xml · derivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,413

Underlying: Common Stock · 7,413 shares

Expires 2030-02-12

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

F3 · derivative.exercise_date: Grant of 7,413 PSUs, 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 trading period between February 12, 2026 and February 12, 2030 (each, a "Performance Milestone"). Upon achievement of a Performance Milestone, vesting is subject to continued employment with the Company through the applicable vesting date, the first fifty percent ( 50%) of which will occur within thirty (30) days of achievment of the applicable milestone and the balance to vest twenty-five percent (25%) on each of the first and second anniversaries of achievement of the corresponding Performance Milestone.

SEC source: 0001936128-26-000011 · wk-form4_1771021608.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,967

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 (2/1/2026), provided that the Reporting Person continues to serve through each such vesting date.

SEC source: 0001936128-26-000008 · wk-form4_1770930785.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,554

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to performance-based restricted stock units granted on July, 1 2022, which vested on February 10, 2026.

SEC source: 0001936128-26-000005 · wk-form4_1770156141.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,451

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to restricted stock units granted on February 21, 2023, January 30, 2024 and February 6, 2025, each of which vested on February 1, 2026.

SEC source: 0001936128-26-000005 · wk-form4_1770156141.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,065

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to performance-based restricted stock units granted on February 21, 2023, which vested on January 31, 2026.

SEC source: 0001936128-26-000002 · wk-form4_1768601806.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,901

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a January 30, 2024 performance restricted stock unit grant that vested on January 15, 2026.

SEC source: 0001936128-25-000009 · wk-form4_1765926437.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,925

F3 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a January 30, 2024 restricted stock unit grant that vested on December 13, 2025.

SEC source: 0001936128-25-000009 · wk-form4_1765926437.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,850

F1 · shares: Represents a bona fide gift by Reporting Person to a tax-exempt public charity under Section 501(c)(3) of the Internal Revenue Code.

F2 · balance_after: Includes an aggregate of 1,437 shares acquired by the Reporting Person on May 31, 2025 and November 30, 2025 pursuant to the Issuer's Employee Stock Purchase Plan.

SEC source: 0001936128-25-000006 · wk-form4_1755636255.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,013

F1 · acquired: Represents a bona fide gift of 600 shares by the Reporting Person to a tax-exempt public charity under Section 501(c)(3) of the Internal Revenue Code.

SEC source: 0001936128-25-000004 · wk-form4_1751925450.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,613

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a July 1, 2022 restricted stock unit grant that vested on July 5, 2025.

SEC source: 0001580808-25-000087 · wk-form4_1748463447.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 58,507

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 24, 2025.

SEC source: 0001580808-25-000087 · wk-form4_1748463447.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 61,007

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 24, 2025.

SEC source: 0001580808-25-000051 · wk-form4_1741742459.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,507

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 21, 2023 performance restricted stock unit grant that vested on March 10, 2025.

SEC source: 0001580808-25-000051 · wk-form4_1741742459.xml · derivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,956 shares

Expires 2027-02-21

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The second achievement date occurred on February 28, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on March 10, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of February 28, 2025, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The second achievement date occurred on February 28, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on March 10, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of February 28, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000051 · wk-form4_1741742459.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,019

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The second achievement date occurred on February 28, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on March 10, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of February 28, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000037 · wk-form4_1740433497.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,063

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to July 1, 2022 performance restricted stock unit grant that vested on February 20, 2025.

SEC source: 0001580808-25-000037 · wk-form4_1740433497.xml · derivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 14,920 shares

Expires 2026-07-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units were previously reported on July 5, 2022, 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 trading period between July 1, 2022 and July 1, 2026. The milestone achievement date occurred on February 10, 2025, as certified by the compensation committee of ATEN, resulting in 14,920 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 20, 2025 and an additional one-quarter (1/4) on each of the first and second anniversaries of February 10, 2025, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units were previously reported on July 5, 2022, 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 trading period between July 1, 2022 and July 1, 2026. The milestone achievement date occurred on February 10, 2025, as certified by the compensation committee of ATEN, resulting in 14,920 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 20, 2025 and an additional one-quarter (1/4) on each of the first and second anniversaries of February 10, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000037 · wk-form4_1740433497.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,851

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units were previously reported on July 5, 2022, 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 trading period between July 1, 2022 and July 1, 2026. The milestone achievement date occurred on February 10, 2025, as certified by the compensation committee of ATEN, resulting in 14,920 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 20, 2025 and an additional one-quarter (1/4) on each of the first and second anniversaries of February 10, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000027 · wk-form4_1739929192.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,931

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 21, 2023 performance restricted stock unit grant that vested on February 13, 2025.

SEC source: 0001580808-25-000027 · wk-form4_1739929192.xml · derivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,956

Underlying: Common Stock · 5,956 shares

Expires 2027-02-21

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The first achievement date occurred on January 31, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 13, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 31, 2025, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The first achievement date occurred on January 31, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 13, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 31, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000027 · wk-form4_1739929192.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,443

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 trading period between February 21, 2023 and February 21, 2027. The first achievement date occurred on January 31, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on February 13, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 31, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000025 · wk-form4_1739225234.xml · derivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,764

Underlying: Common Stock · 7,764 shares

Expires 2029-02-06

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

F3 · derivative.exercise_date: Grant of 7,764 PSUs, 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 February 6, 2025 and February 6, 2029. Once a milestone is met, vesting is subject to continued employment with the Company through the applicable vesting date, the first fifty percent (50%) of which will occur within thirty (30) days of achievment of the applicable milestone and the balance to vest twenty-five percent (25%) on each of the first and second anniversaries of achievement of the corresponding performance milestone.

SEC source: 0001580808-25-000025 · wk-form4_1739225234.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,487

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 (2/1/2025), provided that the Reporting Person continues to serve through each such vesting date.

SEC source: 0001580808-25-000019 · wk-form4_1738708187.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,723

F1 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to restricted stock units granted on February 21, 2023 and January 30, 2024, each of which vested on February 1, 2025.

SEC source: 0001580808-25-000006 · wk-form4_1738020454.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,919

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a January 30, 2024 performance restricted stock unit grant that vested on January 23, 2025.

SEC source: 0001580808-25-000006 · wk-form4_1738020454.xml · derivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,290 shares

Expires 2028-01-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The second milestone achievement date occurred on January 15, 2025, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on January 23, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 15, 2025, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The second milestone achievement date occurred on January 15, 2025, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on January 23, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 15, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-25-000006 · wk-form4_1738020454.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,963

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The second milestone achievement date occurred on January 15, 2025, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on January 23, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of January 15, 2025, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-24-000132 · wk-form4_1735606845.xml · derivative · entry 3

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,290

Underlying: Common Stock · 7,290 shares

Expires 2028-01-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The first achievement date occurred on December 13, 2024, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on December 26, 2024 and an additional one-fourth (1/4) on each of the first and second anniversaries of December 13, 2024, subject to continued employment. These shares are reflected on Table I.

F1 · derivative.exercise_date: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The first achievement date occurred on December 13, 2024, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on December 26, 2024 and an additional one-fourth (1/4) on each of the first and second anniversaries of December 13, 2024, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-24-000132 · wk-form4_1735606845.xml · nonDerivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,673

F2 · shares: Shares automatically withheld, on a non-discretionary basis, for tax purposes related to January 30, 2024 performance restricted stock unit grant that vested on December 26, 2024.

SEC source: 0001580808-24-000132 · wk-form4_1735606845.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,520

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Performance-Based Restricted Stock Units were previously reported on January 31, 2024, 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 trading period between January 30, 2024 and January 30, 2028. The first achievement date occurred on December 13, 2024, as certified by the compensation committee of ATEN, resulting in 7,290 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on December 26, 2024 and an additional one-fourth (1/4) on each of the first and second anniversaries of December 13, 2024, subject to continued employment. These shares are reflected on Table I.

SEC source: 0001580808-24-000126 · wk-form4_1733780256.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,230

F1 · balance_after: Includes 773 shares acquired on November 30, 2024 by the Reporting Person pursuant to the Issuer's Employee Stock Purchase Plan.

SEC source: 0001580808-24-000092 · wk-form4_1720555613.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,269

F1 · shares: Shares withheld, on a non-discretionary basis, for tax purposes related to a July 1, 2022 restricted stock unit grant that vested on July 5, 2024.

F2 · balance_after: Includes 1,392 shares acquired by the Reporting Person pursuant to the Issuer's Employee Stock Purchase Plan on May 31, 2024.

SEC source: 0001580808-24-000037 · wk-form4_1707259360.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,755

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 $13.19 to $13.21 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: 0001580808-24-000015 · wk-form4_1706735375.xml · derivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,580

Underlying: Common Stock · 14,580 shares

Expires 2028-01-30

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

F3 · derivative.exercise_date: Grant of 14,580 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 January 30, 2024 and January 30, 2028. 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 the first and second anniversaries of the corresponding performance milestone.

SEC source: 0001580808-24-000015 · wk-form4_1706735375.xml · nonDerivative · entry 1

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,852

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 (2/1/2024), provided that the Reporting Person continues to serve through each such vesting date.

SEC source: 0001580808-24-000036 · wk-form4a_1707259310.xml · derivative · entry 2

Weber Robert Scott · CIK 0001936128 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,580

Underlying: Common Stock · 14,580 shares

Expires 2028-01-30

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

F4 · derivative.exercise_date: Grant of 14,580 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 January 30, 2024 and January 30, 2028. 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 the first and second anniversaries of the corresponding performance milestone.