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These shares were sold in multiple transactions at prices ranging from $100.79 to $101.25, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by a family trust for which the reporting person is a co-trustee."}],"balance_after":63100,"source":{"system":"sec-edgar","filing":"0001596532-17-000025","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000025/edgardoc.xml","form_type":"4"}},{"id":143087,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former Officer"}}],"security":"Common Stock","published_at":"2017-02-17T20:55:09.000Z","date":"2017-02-15","kind":"sale","acquired":false,"shares":3752,"price":100.4348,"value":376831.3696,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The exercise and sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by a family trust for which the reporting person is a co-trustee."}],"balance_after":64348,"source":{"system":"sec-edgar","filing":"0001596532-17-000025","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000025/edgardoc.xml","form_type":"4"}},{"id":143086,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former Officer"}}],"security":"Common Stock","published_at":"2017-02-17T20:55:09.000Z","date":"2017-02-15","kind":"exercise","acquired":true,"shares":5000,"price":4.18,"value":20900.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The exercise and sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by a family trust for which the reporting person is a co-trustee."}],"balance_after":68100,"source":{"system":"sec-edgar","filing":"0001596532-17-000025","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000025/edgardoc.xml","form_type":"4"}},{"id":144908,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2017-01-19T17:25:11.000Z","date":"2017-01-17","kind":"sale","acquired":false,"shares":800,"price":93.0813,"value":74465.04,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":63100,"source":{"system":"sec-edgar","filing":"0001596532-17-000008","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000008/edgardoc.xml","form_type":"4"}},{"id":144907,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2017-01-19T17:25:11.000Z","date":"2017-01-17","kind":"sale","acquired":false,"shares":682,"price":91.9944,"value":62740.1808,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":63900,"source":{"system":"sec-edgar","filing":"0001596532-17-000008","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000008/edgardoc.xml","form_type":"4"}},{"id":144906,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2017-01-19T17:25:11.000Z","date":"2017-01-17","kind":"sale","acquired":false,"shares":400,"price":90.895,"value":36358.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":64582,"source":{"system":"sec-edgar","filing":"0001596532-17-000008","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000008/edgardoc.xml","form_type":"4"}},{"id":144905,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2017-01-19T17:25:11.000Z","date":"2017-01-17","kind":"sale","acquired":false,"shares":444,"price":90.0616,"value":39987.3504,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":64982,"source":{"system":"sec-edgar","filing":"0001596532-17-000008","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000008/edgardoc.xml","form_type":"4"}},{"id":144904,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2017-01-19T17:25:11.000Z","date":"2017-01-17","kind":"sale","acquired":false,"shares":712,"price":88.7111,"value":63162.3032,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":66138,"source":{"system":"sec-edgar","filing":"0001596532-17-000008","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653217000008/edgardoc.xml","form_type":"4"}},{"id":145714,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-12-16T19:50:30.000Z","date":"2016-12-15","kind":"sale","acquired":false,"shares":1388,"price":97.6657,"value":135559.9916,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":68100,"source":{"system":"sec-edgar","filing":"0001596532-16-000368","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000368/edgardoc.xml","form_type":"4"}},{"id":145713,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-12-16T19:50:30.000Z","date":"2016-12-15","kind":"sale","acquired":false,"shares":3612,"price":96.6858,"value":349229.1096,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":69488,"source":{"system":"sec-edgar","filing":"0001596532-16-000368","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000368/edgardoc.xml","form_type":"4"}},{"id":146898,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-11-16T17:41:14.000Z","date":"2016-11-15","kind":"sale","acquired":false,"shares":4500,"price":87.9807,"value":395913.15,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":73100,"source":{"system":"sec-edgar","filing":"0001596532-16-000342","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000342/edgardoc.xml","form_type":"4"}},{"id":146897,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-11-16T17:41:14.000Z","date":"2016-11-15","kind":"sale","acquired":false,"shares":500,"price":86.812,"value":43406.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":78100,"source":{"system":"sec-edgar","filing":"0001596532-16-000325","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000325/edgardoc.xml","form_type":"4"}},{"id":147938,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-10-19T20:20:17.000Z","date":"2016-09-15","kind":"sale","acquired":false,"shares":1109,"price":82.9204,"value":91958.7236,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"The exercise and sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2016, and amended on June 2, 2016."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $82.60 to $83.59, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":81991,"source":{"system":"sec-edgar","filing":"0001596532-16-000325","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000325/edgardoc.xml","form_type":"4"}},{"id":147937,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark 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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."}],"balance_after":94250,"source":{"system":"sec-edgar","filing":"0001596532-16-000259","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000259/edgardoc.xml","form_type":"4"}},{"id":152861,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-05-12T20:08:08.000Z","date":"2016-03-14","kind":"gift","acquired":false,"shares":4000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"by Trust"},"balance_after":99250,"source":{"system":"sec-edgar","filing":"0001596532-16-000259","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000259/edgardoc.xml","form_type":"4"}},{"id":152860,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2016-05-12T20:08:08.000Z","date":"2016-02-16","kind":"grant","acquired":true,"shares":376,"price":36.55,"value":13742.8,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 376 shares acquired under the Arista Networks, Inc. 2014 Employee Share Purchase Plan on February 16, 2016."}],"balance_after":1244,"source":{"system":"sec-edgar","filing":"0001596532-16-000259","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000259/edgardoc.xml","form_type":"4"}},{"id":155840,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, WW Sales Operations"}}],"security":"Non-qualified Stock Option (Right to Buy)","published_at":"2016-02-17T21:44:42.000Z","date":"2016-02-12","kind":"grant","acquired":true,"shares":20000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"1/5th of the shares subject to the option shall vest on April 1, 2017 and 1/60th of the shares subject to the option shall vest each month thereafter provided that the reporting person continues to be a service provider to the Issuer as of each vest date."}],"balance_after":20000,"derivative":{"exercise_price":56.24,"exercise_date":"2017-04-01","expiration_date":"2026-02-11","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001133206-16-000006","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000113320616000006/primary_doc.xml","form_type":"4"}},{"id":155839,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, WW Sales Operations"}}],"security":"Restricted Stock Unit Award","published_at":"2016-02-17T21:44:42.000Z","date":"2016-02-12","kind":"grant","acquired":true,"shares":6000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty percent (20%) of the restricted stock unit will vest on February 20, 2017 and five percent (5%) of the award will vest every quarter on each quarterly vest date.  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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Twenty percent (20%) of the restricted stock unit will vest on February 20, 2017 and five percent (5%) of the award will vest every quarter on each quarterly vest date.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":103741,"source":{"system":"sec-edgar","filing":"0001596532-16-000238","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653216000238/edgardoc.xml","form_type":"4"}},{"id":158185,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Sr. VP, Worldwide Sales","other_text":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-12-28T18:38:22.000Z","date":"2015-12-23","kind":"sale","acquired":false,"shares":1150,"price":73.147,"value":84119.05,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":104891,"source":{"system":"sec-edgar","filing":"0001596532-15-000234","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000234/edgardoc.xml","form_type":"4"}},{"id":158343,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":true,"officer_title":"Sr. VP, Worldwide Sales","other_text":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-12-18T11:39:36.000Z","date":"2015-12-16","kind":"sale","acquired":false,"shares":1150,"price":71.2667,"value":81956.705,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":107191,"source":{"system":"sec-edgar","filing":"0001596532-15-000227","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000227/edgardoc.xml","form_type":"4"}},{"id":158507,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-12-11T12:20:48.000Z","date":"2015-12-09","kind":"sale","acquired":false,"shares":1000,"price":72.067,"value":72067.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":107341,"source":{"system":"sec-edgar","filing":"0001596532-15-000227","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000227/edgardoc.xml","form_type":"4"}},{"id":158626,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-12-04T17:12:36.000Z","date":"2015-12-02","kind":"sale","acquired":false,"shares":100,"price":75.875,"value":7587.5,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":108341,"source":{"system":"sec-edgar","filing":"0001596532-15-000219","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000219/edgardoc.xml","form_type":"4"}},{"id":158625,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-12-04T17:12:36.000Z","date":"2015-12-02","kind":"sale","acquired":false,"shares":1050,"price":75.05,"value":78802.5,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":108441,"source":{"system":"sec-edgar","filing":"0001596532-15-000219","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000219/edgardoc.xml","form_type":"4"}},{"id":158831,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-11-25T18:55:26.000Z","date":"2015-11-25","kind":"sale","acquired":false,"shares":350,"price":74.3343,"value":26017.005,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":131341,"source":{"system":"sec-edgar","filing":"0001596532-15-000078","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000078/edgardoc.xml","form_type":"4"}},{"id":162924,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-07-06T17:48:48.000Z","date":"2015-07-01","kind":"sale","acquired":false,"shares":1150,"price":82.1674,"value":94492.51,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a co-trustee."}],"balance_after":132491,"source":{"system":"sec-edgar","filing":"0001596532-15-000076","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000076/edgardoc.xml","form_type":"4"}},{"id":163131,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-06-25T11:16:50.000Z","date":"2015-06-24","kind":"sale","acquired":false,"shares":1150,"price":87.4404,"value":100556.46,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":133641,"source":{"system":"sec-edgar","filing":"0001596532-15-000060","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000060/edgardoc.xml","form_type":"4"}},{"id":163162,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-06-19T14:17:07.000Z","date":"2015-06-17","kind":"sale","acquired":false,"shares":1150,"price":85.5671,"value":98402.165,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":134791,"source":{"system":"sec-edgar","filing":"0001596532-15-000058","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000058/edgardoc.xml","form_type":"4"}},{"id":163306,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-06-11T19:20:06.000Z","date":"2015-06-10","kind":"sale","acquired":false,"shares":1150,"price":80.2169,"value":92249.435,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a co-trustee."}],"balance_after":135941,"source":{"system":"sec-edgar","filing":"0001596532-15-000046","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000046/edgardoc.xml","form_type":"4"}},{"id":163414,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. VP, Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-06-05T10:35:31.000Z","date":"2015-06-03","kind":"sale","acquired":false,"shares":1150,"price":72.7887,"value":83707.005,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person is a trustee."}],"balance_after":138241,"source":{"system":"sec-edgar","filing":"0001596532-15-000026","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000159653215000026/edgardoc.xml","form_type":"4"}},{"id":163639,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-05-21T19:33:25.000Z","date":"2015-05-20","kind":"sale","acquired":false,"shares":1150,"price":67.373,"value":77478.95,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":141691,"source":{"system":"sec-edgar","filing":"0001293595-15-000002","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000129359515000002/primary_doc.xml","form_type":"4"}},{"id":164597,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-04-23T17:04:16.000Z","date":"2015-04-22","kind":"sale","acquired":false,"shares":1150,"price":65.9978,"value":75897.47,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held in a family trust for which the reporting person serves as trustee."}],"balance_after":143991,"source":{"system":"sec-edgar","filing":"0001546946-15-000006","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000006/primary_doc.xml","form_type":"4"}},{"id":164805,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-04-15T19:22:16.000Z","date":"2015-04-15","kind":"sale","acquired":false,"shares":1150,"price":67.0104,"value":77061.96,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as a trustee."}],"balance_after":145141,"source":{"system":"sec-edgar","filing":"0001546946-15-000005","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000005/primary_doc.xml","form_type":"4"}},{"id":165089,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-04-10T16:05:15.000Z","date":"2015-04-08","kind":"sale","acquired":false,"shares":1150,"price":65.8363,"value":75711.745,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":146291,"source":{"system":"sec-edgar","filing":"0001209191-15-033548","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000120919115033548/doc4.xml","form_type":"4"}},{"id":165228,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-04-02T17:42:40.000Z","date":"2015-04-01","kind":"sale","acquired":false,"shares":1150,"price":69.3626,"value":79766.99,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of the shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for the reporting person serves as trustee."}],"balance_after":147441,"source":{"system":"sec-edgar","filing":"0001546946-15-000004","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000004/primary_doc.xml","form_type":"4"}},{"id":165387,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"sVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-03-25T18:21:54.000Z","date":"2015-03-25","kind":"sale","acquired":false,"shares":1150,"price":68.9828,"value":79330.22,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":148591,"source":{"system":"sec-edgar","filing":"0001546946-15-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000003/primary_doc.xml","form_type":"4"}},{"id":165465,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-03-19T17:04:14.000Z","date":"2015-03-18","kind":"sale","acquired":false,"shares":1150,"price":73.9309,"value":85020.535,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":149741,"source":{"system":"sec-edgar","filing":"0001605807-15-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000160580715000003/primary_doc.xml","form_type":"4"}},{"id":165751,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-03-12T17:18:58.000Z","date":"2015-03-11","kind":"sale","acquired":false,"shares":1150,"price":68.443,"value":78709.45,"ownership":{"direct":false,"nature":"By Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":150891,"source":{"system":"sec-edgar","filing":"0001546946-15-000002","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000002/primary_doc.xml","form_type":"4"}},{"id":165852,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-03-06T18:30:53.000Z","date":"2015-03-04","kind":"sale","acquired":false,"shares":1150,"price":68.2204,"value":78453.46,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of the shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on September 11, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":152041,"source":{"system":"sec-edgar","filing":"0001605808-15-000003","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000160580815000003/primary_doc.xml","form_type":"4"}},{"id":166280,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP Worldwide Sales"}}],"security":"Common Stock","published_at":"2015-02-25T20:20:19.000Z","date":"2015-02-25","kind":"sale","acquired":false,"shares":1150,"price":67.2339,"value":77318.985,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on September 11, 2014."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in column 4 is a weighted average price.  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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 491 shares acquired under the ANET Employee Stock Purchase Plan on February 17, 2015."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by a family trust for which the reporting person serves as trustee."}],"balance_after":154341,"source":{"system":"sec-edgar","filing":"0001546946-15-000001","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694615000001/primary_doc.xml","form_type":"4"}},{"id":168306,"issuer":{"id":2421,"kind":"organization","name":"Arista Networks, Inc.","symbol":"ANET"},"owners":[{"id":12312,"kind":"person","name":"Smith Mark Stephen","position":1,"cik":"0001546946","reported_name":"Smith Mark Stephen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP WW Sales Operations"}}],"security":"Options to purchase common stock","published_at":"2014-12-17T21:17:12.000Z","date":"2014-12-16","kind":"grant","acquired":true,"shares":20000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/5th of the shares subject to the option shall vest one year after December 1, 2016, and 1/60th of the shares subject to the option shall vest each month thereafter provided that the reporting person continues to be a service provider to the Issuer as of each vest date."}],"balance_after":20000,"derivative":{"exercise_price":68.34,"exercise_date":"2017-12-01","expiration_date":"2024-12-15","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001546946-14-000003","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1546946/000154694614000003/primary_doc.xml","form_type":"4"}}]}