ANET

SEC source: 0001596532-26-000207 · edgardoc.xml · nonDerivative · entry 1

TEMPLETON MARK B · CIK 0001201938 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,410

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000208 · edgardoc.xml · derivative · entry 2

Wassenaar Yvonne · CIK 0001707744 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,615

Underlying: Common Stock · 538 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F2 · derivative.exercise_date: The reporting person was granted RSUs on May 29, 2026. 1/4th of the shares vest on August 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20.

F2 · derivative.expiration_date: The reporting person was granted RSUs on May 29, 2026. 1/4th of the shares vest on August 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20.

SEC source: 0001596532-26-000208 · edgardoc.xml · nonDerivative · entry 1

Wassenaar Yvonne · CIK 0001707744 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,322

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000209 · edgardoc.xml · derivative · entry 5

Breithaupt Chantelle Yvette · CIK 0001850596 · Senior Vice President, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,550

Underlying: Common Stock · 1,350 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F4 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vest on February 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F4 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vest on February 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000209 · edgardoc.xml · derivative · entry 4

Breithaupt Chantelle Yvette · CIK 0001850596 · Senior Vice President, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,504

Underlying: Common Stock · 10,920 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F3 · derivative.exercise_date: Twenty five percent (25%) of the restricted stock units awarded vested on Feb 20, 2025 and will continue to vest at a rate of six and one-quarter percent (6.25%) each quarter on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20 or November 20 of each year.

F3 · derivative.expiration_date: Twenty five percent (25%) of the restricted stock units awarded vested on Feb 20, 2025 and will continue to vest at a rate of six and one-quarter percent (6.25%) each quarter on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20 or November 20 of each year.

SEC source: 0001596532-26-000209 · edgardoc.xml · nonDerivative · entry 3

Breithaupt Chantelle Yvette · CIK 0001850596 · Senior Vice President, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,533

F2 · kind: Represents shares withheld to satisfy tax withholding obligations on the vesting of restricted stock units.

SEC source: 0001596532-26-000209 · edgardoc.xml · nonDerivative · entry 2

Breithaupt Chantelle Yvette · CIK 0001850596 · Senior Vice President, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,678

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000209 · edgardoc.xml · nonDerivative · entry 1

Breithaupt Chantelle Yvette · CIK 0001850596 · Senior Vice President, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,328

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 30

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,884

Underlying: Common Stock · 3,880 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F21 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2023 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F21 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2023 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 29

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 317,056

Underlying: Common Stock · 19,816 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F20 · derivative.exercise_date: Five percent (5%) of the restricted stock awarded vested on November 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F20 · derivative.expiration_date: Five percent (5%) of the restricted stock awarded vested on November 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 28

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,516

Underlying: Common Stock · 1,832 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F19 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F19 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 27

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,588

Underlying: Common Stock · 4,148 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F18 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on on February 20, 2024 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F18 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on on February 20, 2024 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 26

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,736

Underlying: Common Stock · 4,148 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F18 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on on February 20, 2024 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F18 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on on February 20, 2024 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 25

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 17,550

Underlying: Common Stock · 1,350 shares

Expires not disclosed

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

F10 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F17 · derivative.exercise_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F17 · derivative.expiration_date: Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 24

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,334 shares

Expires 2028-11-08

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

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F16 · derivative.exercise_date: 1/48th of the shares subject to the option shall vest and become exercisable on December 1, 2020 and 1/48th of the shares subject to the option shall continue to vest each month thereafter.

SEC source: 0001596532-26-000210 · edgardoc.xml · derivative · entry 23

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 156,001

Underlying: Common Stock · 3,999 shares

Expires 2029-02-07

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

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F15 · derivative.exercise_date: 1/48th of the shares subject to the option shall vest and become exercisable on December 1, 2020 and 1/48th of the shares subject to the option shall continue to vest each month thereafter.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 20

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 122,375

F12 · kind: Represents shares withheld to satisfy tax withholding obligations on the vesting of restricted stock units.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 19

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 137,916

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.

F10 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 18

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 136,566

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.

F10 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 17

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 116,750

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

F10 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 16

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 114,918

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.

F10 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 15

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 110,770

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.

F10 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F11 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 14

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Foundation

Disclosed balance after: 452,400

F8 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.7331 to $187.16, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F9 · ownership.nature: These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 13

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Foundation

Disclosed balance after: 452,872

F8 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.7311 to $186.7213, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F9 · ownership.nature: These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 12

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Foundation

Disclosed balance after: 456,661

F8 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.72 to $185.719, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F9 · ownership.nature: These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 11

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Foundation

Disclosed balance after: 459,978

F8 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $183.72 to $184.7176, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F9 · ownership.nature: These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 10

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Childrens' Trust

Disclosed balance after: 1,015,168

F6 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.7331 to $187.16, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7 · ownership.nature: These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 9

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Childrens' Trust

Disclosed balance after: 1,015,922

F6 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.7311 to $186.7213, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7 · ownership.nature: These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 8

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Childrens' Trust

Disclosed balance after: 1,021,985

F6 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.72 to $185.719, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7 · ownership.nature: These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 7

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Indirect · By Childrens' Trust

Disclosed balance after: 1,027,293

F6 · kind: The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $183.72 to $184.7176, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7 · ownership.nature: These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 6

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 12,976

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.7331 to $187.16, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 5

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 13,794

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.7311 to $186.7213, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 4

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,362

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.72 to $185.719, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 3

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,112

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $183.72 to $184.7176, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 2

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,309

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

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

SEC source: 0001596532-26-000210 · edgardoc.xml · nonDerivative · entry 1

Duda Kenneth · CIK 0001605808 · Director · President and CTO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,310

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

F1 · kind: The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

SEC source: 0001596532-26-000211 · edgardoc.xml · derivative · entry 6

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,360 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F4 · derivative.exercise_date: This performance stock award was granted in the second quarter of 2025 and was earned based on attainment of certain performance conditions. The award vested on February 20, 2026.

F4 · derivative.expiration_date: This performance stock award was granted in the second quarter of 2025 and was earned based on attainment of certain performance conditions. The award vested on February 20, 2026.

SEC source: 0001596532-26-000211 · edgardoc.xml · derivative · entry 5

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,360

Underlying: Common Stock · 10,360 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F4 · derivative.exercise_date: This performance stock award was granted in the second quarter of 2025 and was earned based on attainment of certain performance conditions. The award vested on February 20, 2026.

F4 · derivative.expiration_date: This performance stock award was granted in the second quarter of 2025 and was earned based on attainment of certain performance conditions. The award vested on February 20, 2026.

SEC source: 0001596532-26-000211 · edgardoc.xml · derivative · entry 4

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 349,545

Underlying: Common Stock · 116,515 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F3 · derivative.exercise_date: Twenty five percent (25%) of the restricted stock units awarded will vest on August 20, 2026 and will continue to vest at a rate of six and one-quarter percent (6.25%) each quarter on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20 or November 20 of each year.

F3 · derivative.expiration_date: Twenty five percent (25%) of the restricted stock units awarded will vest on August 20, 2026 and will continue to vest at a rate of six and one-quarter percent (6.25%) each quarter on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20 or November 20 of each year.

SEC source: 0001596532-26-000211 · edgardoc.xml · nonDerivative · entry 3

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,463

F2 · kind: Represents shares withheld to satisfy tax withholding obligations on the vesting of restricted stock units.

SEC source: 0001596532-26-000211 · edgardoc.xml · nonDerivative · entry 2

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 133,003

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000211 · edgardoc.xml · nonDerivative · entry 1

Nightingale Todd · CIK 0001944844 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,643

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000212 · edgardoc.xml · derivative · entry 8

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,332

Underlying: Common Stock · 27,664 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

F6 · derivative.exercise_date: This performance stock award was granted in the first quarter of 2023 and was earned based on attainment of certain performance conditions. The award vested (25%) on February 20, 2024, and will continue to vest quarterly over 3 years. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

F6 · derivative.expiration_date: This performance stock award was granted in the first quarter of 2023 and was earned based on attainment of certain performance conditions. The award vested (25%) on February 20, 2024, and will continue to vest quarterly over 3 years. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year.

SEC source: 0001596532-26-000212 · edgardoc.xml · nonDerivative · entry 2

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,726

F2 · kind: Represents shares withheld to satisfy tax withholding obligations on the vesting of restricted stock units.

SEC source: 0001596532-26-000212 · edgardoc.xml · nonDerivative · entry 1

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,581

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 · price: Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

SEC source: 0001596532-26-000190 · edgardoc.xml · nonDerivative · entry 25

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 15,988,580

F9 · kind: The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $211.36 to $211.37, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F10 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000190 · edgardoc.xml · nonDerivative · entry 24

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 15,990,602

F9 · kind: The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $210.23 to $211.20, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F10 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000190 · edgardoc.xml · nonDerivative · entry 23

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 16,034,749

F9 · kind: The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2025.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $209.00 to $209.89, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F10 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000190 · edgardoc.xml · nonDerivative · entry 22

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 16,042,834

F9 · kind: The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $208.00 to $208.97, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F10 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.

SEC source: 0001596532-26-000190 · edgardoc.xml · nonDerivative · entry 21

Ullal Jayshree · CIK 0001605809 · Director · CEO and Chairperson

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 16,160,496

F9 · kind: The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2025.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $207.00 to $207.99, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F10 · ownership.nature: These shares are held by a family trust for which the reporting person is co-trustee.