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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price"},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1024851,"source":{"system":"sec-edgar","filing":"0001362672-21-000013","document":"wf-form4_163225696772753.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000013/wf-form4_163225696772753.xml","form_type":"4"}},{"id":2595489,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-08-20T20:51:19.000Z","date":"2021-08-19","kind":"sale","acquired":false,"shares":20598,"price":27.88,"value":574272.24,"ownership":{"direct":false,"nature":"By Paul V. Walsh, Jr. Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported transaction involves sale transactions ranging from $27.40 to $28.13 per share. The weighted average price per share was $27.88. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1094851,"source":{"system":"sec-edgar","filing":"0001362672-21-000011","document":"wf-form4_162949266312230.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000011/wf-form4_162949266312230.xml","form_type":"4"}},{"id":2595488,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-08-20T20:51:19.000Z","date":"2021-08-18","kind":"sale","acquired":false,"shares":49402,"price":27.94,"value":1380291.88,"ownership":{"direct":false,"nature":"By Paul V. 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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1115449,"source":{"system":"sec-edgar","filing":"0001362672-21-000011","document":"wf-form4_162949266312230.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000011/wf-form4_162949266312230.xml","form_type":"4"}},{"id":2629640,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-07-21T00:06:24.000Z","date":"2021-07-19","kind":"sale","acquired":false,"shares":70000,"price":25.11,"value":1757700.0,"ownership":{"direct":false,"nature":"By Paul V. 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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1164851,"source":{"system":"sec-edgar","filing":"0001362672-21-000007","document":"wf-form4_162682596537009.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000007/wf-form4_162682596537009.xml","form_type":"4"}},{"id":2664970,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-06-17T21:58:51.000Z","date":"2021-06-17","kind":"sale","acquired":false,"shares":70000,"price":27.22,"value":1905400.0,"ownership":{"direct":false,"nature":"By Paul V. 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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1234851,"source":{"system":"sec-edgar","filing":"0001362672-21-000006","document":"wf-form4_162396711334252.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000006/wf-form4_162396711334252.xml","form_type":"4"}},{"id":2706490,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-05-19T21:25:58.000Z","date":"2021-05-19","kind":"sale","acquired":false,"shares":4725,"price":23.59,"value":111462.75,"ownership":{"direct":false,"nature":"By Paul V. 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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1304851,"source":{"system":"sec-edgar","filing":"0001362672-21-000004","document":"wf-form4_162145952335086.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000004/wf-form4_162145952335086.xml","form_type":"4"}},{"id":2706489,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-05-19T21:25:58.000Z","date":"2021-05-18","kind":"sale","acquired":false,"shares":65275,"price":23.98,"value":1565294.5,"ownership":{"direct":false,"nature":"By Paul V. 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The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2021."}],"balance_after":1309576,"source":{"system":"sec-edgar","filing":"0001362672-21-000004","document":"wf-form4_162145952335086.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000004/wf-form4_162145952335086.xml","form_type":"4"}},{"id":2719506,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2021-05-11T21:47:10.000Z","date":"2021-05-07","kind":"grant","acquired":true,"shares":41146,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents an award of Restricted Stock Units (\"RSUs\"). Each RSU represents a contingent right to receive one share of common stock. 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Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in four equal annual installments beginning on May 16, 2022."}],"balance_after":56347,"source":{"system":"sec-edgar","filing":"0001362672-21-000002","document":"wf-form4_162076961441555.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000136267221000002/wf-form4_162076961441555.xml","form_type":"4"}},{"id":2993542,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Class L Common Stock","published_at":"2020-11-05T01:50:34.000Z","date":"2020-10-28","kind":"exercise","acquired":false,"shares":67000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Paul V. 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Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in four equal annual installments beginning on November 18, 2021."}],"balance_after":32143,"source":{"system":"sec-edgar","filing":"0000899243-20-030428","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/866291/000089924320030428/doc4.xml","form_type":"4"}},{"id":2993539,"issuer":{"id":3746,"kind":"organization","name":"ALLEGRO MICROSYSTEMS, INC."},"owners":[{"id":21089,"kind":"person","name":"Walsh Paul V Jr","position":1,"cik":"0001362672","reported_name":"Walsh Paul V Jr","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CFO & Treasurer"}}],"security":"Common Stock","published_at":"2020-11-05T01:50:34.000Z","date":"2020-10-28","kind":"disposition_to_issuer","acquired":false,"shares":287912,"price":13.195,"value":3798998.84,"ownership":{"direct":false,"nature":"By Paul V. 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Walsh, Jr. Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"As of the pricing of the Issuer's initial public offering on October 28, 2020, the Class A and Class L common stock held by the reporting person were automatically converted into and reclassified as an aggregate of 1,662,763 shares of common stock of the Issuer."}],"balance_after":1662763,"source":{"system":"sec-edgar","filing":"0000899243-20-030428","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866291/000089924320030428/doc4.xml","form_type":"4"}}]}