Related Party Transactions	12 Months Ended
Mar. 25, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Public Offering of the Company’s Common Stock by Certain Stockholders On February 2, 2021, the Company filed a Registration Statement on Form S-1 for the public offering of shares owned by certain selling stockholders, including Sanken, OEP and certain of the Company’s officers and directors. The selling stockholders sold 19,332,852 shares of the Company’s common stock, including 1,832,852 shares of common stock sold by OEP in connection with the underwriters’ exercise of their over-allotment option. The Company did not sell any shares of its common stock and did not receive any of the proceeds from the offering. However, the Company incurred expenses, costs and fees in connection with the offering, including registration, filing and listing fees, printing fees and legal and accounting expenses, in the amount of $1,790 for the fiscal year ended March 26, 2021, which are included in selling, general and administrative expense in the accompanying consolidated statements of operations and comprehensive income. Transactions Involving Sanken The Company sells products to, and purchases in-process products from Sanken. In addition, prior to March 28, 2020, the Company also sold products for Sanken. Net sales of the Company’s products to Sanken totaled $148,813, $104,661 and $184,557 during the fiscal years ended March 25, 2022, March 26, 2021 and March 27, 2020, respectively. Trade accounts receivables, net of allowances from Sanken totaled $27,256 and $21,595 as of March 25, 2022 and March 26, 2021, respectively. Other accounts receivable from Sanken totaled $104 and $198 as of March 25, 2022 and March 26, 2021, respectively. During fiscal year 2020, the Company acted as a distributor of Sanken’s products. Net sales of Sanken’s products by the Company to third parties totaled $35,421 during the fiscal year ended March 27, 2020. On March 28, 2020, the Company formally terminated its distribution agreement with Sanken to distribute Sanken’s products. Purchases of various products from Sanken totaled $31,917 for the fiscal year ended March 27, 2020. Accounts payable to Sanken totaled $4,494 as of March 27, 2020. Termination of Sanken Distribution Agreement In May 2022, the Company issued a letter of intent with Sanken to develop a plan to transition the supply chain and sales activity in Japan from Sanken to the Company. During the planning process, both parties will define the transition timeline and method for customer communication, supply chain transfer and sales coverage. Parties will also define a method to continue engagement with Sanken on the support of select customers. Joint Development Agreement (“Development Agreement”) The Company, through its former wholly owned subsidiary, PSL, entered into a Development Agreement with Sanken whereby the Company and Sanken jointly own a specific wafer technology and share the reimbursement of development costs incurred by the Company. Sanken reimbursed $1,440 in fiscal year ended March 27, 2020. Sanken reimbursed no amounts in the fiscal years ended March 25, 2022 and March 26, 2021. Short-term Bridge Loan Receivable to Sanken In March 2019, the Company entered into a short-term bridge loan to Sanken in the amount of $30,000. The loan bore interest of 2.52% and was repaid in April 2019. Interest income related to the loan to Sanken was $55 in the fiscal year ended March 27, 2020. Notes Payable and Line-of credit from Sanken The Company, through PSL, its former wholly owned subsidiary, had related party debt owed to Sanken that includes three notes payable in the aggregate amount of $17,700 and two lines-of-credit agreements in the aggregate amount of $25,000 at March 27, 2020. The interest rates on the related party debt were reset at the beginning of each calendar quarter to LIBOR on the last trading day of the previous month, plus a 1.0% spread. Related party interest expense consisting of amounts due to Sanken for intercompany notes payable, lines-of-credit and miscellaneous charges for the fiscal year ended March 27, 2020 amounted to $1,444, and related party interest paid for the same period amounted to $1,538. In connection with the PSL Divestiture, the total $42,700 balance was contributed in-kind for the fair value of the 70% interest that Sanken acquired. Transactions involving PSL In accordance with the PSL Divestiture, the Company had both intercompany accounts payable of $1,198 and accounts receivable of $3,368 that were previously eliminated in consolidation. The previous intercompany receivable balance of $3,368 was moved into trade and other accounts receivable due from related party as of March 28, 2020. In addition, as a result of PSL taking over the Sanken distribution business, as of March 26, 2021, the Company reflected a related accounts receivable balance of $767. This amount includes reductions of $767 and $2,601 from payments made by PSL during the fiscal years ended March 25, 2022 and March 26, 2021, respectively. No accounts receivable balance was recorded as of March 25, 2022. In May 2009, the Company entered into a technology development agreement (the “IC Technology Development Agreement”) with Polar Semiconductor, Inc. (“PSI”) (subsequently changed to Polar Semiconductor, LLC), and Sanken, pursuant to which the parties agreed upon the general terms under which they may, from time to time, undertake certain activities (the “IC Process Development Activities”) to develop new technologies to be used by PSI to manufacture products for the Company and Sanken, as well as the ownership and use of such technologies following their development. The IC Technology Development Agreement provides that the expenses for all IC Process Development Activities will be shared equally by the Company and Sanken on an annual basis (subject to any exceptions upon which the parties may agree from time to time), with such expenses being paid to PSL by Sanken in the form of an up-front annual fee, with PSL being responsible for any expenses that exceed the amount of such fee. The IC Technology Development Agreement will continue in effect until such time as the Company, PSL and Sanken mutually agree to its termination or adopt a successor agreement, or in the event that the companies fail to agree upon the annual fee for that fiscal year within three months after the commencement of such fiscal year. During the fiscal year ended March 25, 2022, the Company (through PSL) received no fees from Sanken and paid no fees to PSL pursuant to the IC Technology Development Agreement. During each of the fiscal years ended March 26, 2021 and March 27, 2020, the Company (through PSL) received fees of $1,200 from Sanken pursuant to the IC Technology Development Agreement, and during the same periods the Company paid fees of $1,200 to PSL pursuant to the IC Technology Development Agreement. In April 2015, PSL and Sanken entered into a discrete technology development agreement (as amended, the “Discrete Technology Development Agreement”), pursuant to which the parties agreed upon the general terms under which they, from time to time, undertook certain activities (the “Discrete Development Activities”) to develop new technologies to be used by PSL to manufacture products for Sanken, as well as the ownership and use of such technologies following their development. In June 2018, the Company, PSL and Sanken entered into an amendment to the Discrete Technology Development Agreement pursuant to which the parties agreed to the assignment of all rights and obligations of PSL under such agreement to the Company and to certain amendments to the terms of such agreement. The Discrete Technology Development Agreement provided that the expenses for all Discrete Development Activities to be shared equally by the Company and Sanken on an annual basis (subject to any exceptions upon which the parties agreed to from time to time). As of March 26, 2021, the Company had accrued $614 included in amounts due to related party under this agreement, which was paid in the first quarter of fiscal year 2022. The Discrete Technology Development Agreement terminated on March 31, 2021 in accordance with its terms. The Company continues to purchase in-process products from PSL. Purchases of various products from PSL totaled $55,297 and $42,196 for the fiscal years ended March 25, 2022 and March 26, 2021, respectively. This amount includes none and $5,930 of price support payments made for the fiscal years ended March 25, 2022 and March 26, 2021, respectively. In accordance with the PSL Divestiture, the Company had intercompany accounts payable of $1,198 that was previously eliminated in consolidation. The previous intercompany payable balance of $1,198 was moved into amounts due to related party as of March 28, 2020. Accounts payable to PSL included in amounts due to related party totaled $5,222 and $1,739 as of March 25, 2022 and March 26, 2021, respectively. These amounts include reductions of $5,222 and $1,198 from payments made to PSL during the fiscal years ended March 25, 2022 and March 26, 2021, respectively. Notes Receivable from PSL On March 28, 2020, in connection with the PSL Divestiture, the Company contributed the forgiveness of the fair value of $15,000 out of the $66,377 total debt owed by PSL to the Company, which was previously eliminated in consolidation as of March 27, 2020. As a result of the PSL Divestiture, on March 28, 2020, the $51,377 note receivable from PSL was classified on the Company’s balance sheet as related party note receivable. The related party note receivable held by the Company had a maturity date of March 28, 2027 and bore interest at a rate of 2.70%, which was a market rate determined by IRS guidance at the time of the divestiture. The entire receivable of $51,377 plus accrued interest of $762 was repaid on October 14, 2020. On December 2, 2021, AML entered into a loan agreement with PSL wherein PSL provided an initial promissory note to AML for a principal amount of $7,500 (the “Initial PSL Loan”). The Initial PSL Loan will be repaid in equal installments, comprising of principal and interest accrued at 1.26% per annum, over a term of four years with payments due on the first day of each calendar year quarter (April 1st, July 1st, October 1st, and January 1st). In addition, PSL has the option of borrowing up to an additional $7,500 on or around January 1, 2023 under the same terms of the PSL Loan (the “Secondary PSL Loan” and, together with the Initial PSL Loan, the “PSL Promissory Notes”). PSL has informed the Company of its intent to elect its option of the Secondary PSL Loan during fiscal year 2023. The loan funds will be used by PSL to procure a deep ultraviolet scanner and other associated manufacturing tools necessary to increase wafer fabrication capacity in support of the Company’s increasing wafer demand. As of March 25, 2022, the outstanding balance of the PSL Promissory Notes was $7,500. On April 1, 2022, PSL made a quarterly payment to AML of $500, which included $31 of interest income. Transition Services Agreement As part of the PSL Divestiture, the Company, PSL and Sanken entered into the Transition Services Agreement (“TSA”), pursuant to which the Company agreed, among other things, to provide certain human resources, legal and distribution support services to PSL following the consummation of the PSL Divestiture. The TSA provides that the Company and its wholly owned subsidiaries AML and Allegro MicroSystems Europe Ltd. will provide such services in a manner generally consistent with the manner in which they were provided during the 12 months prior to the date of the TSA, and will not be obligated to perform any service in a manner that is materially more burdensome than the analogous services provided for or within its own organization or group during such 12-month period. The services contemplated by the TSA include human resources, legal and distribution support services. The applicable service period for human resources and legal services is 12 months, and fees payable for such services are $50 per year, invoiced on a quarterly basis. The applicable service period for distribution support services is six months with respect to services provided in North America and South America, and nine months with respect to services provided in Europe. All distribution support services are to be provided on a cost plus 10% basis. The Company received $25 under the TSA during each of the fiscal years ended March 25, 2022 and March 26, 2021. The TSA has an initial term of 12 months and may be extended for additional 12-month terms on an annual basis if the parties so agree prior to the expiration of the then-current term. Unless the TSA otherwise provides, PSL may terminate a specific service prior to the end of the term by providing at least 60 days’ prior written notice. The North America and South America portion of this agreement was terminated as of March 26, 2021. Transactions involving Sanken Electric Europe Ltd. (“SEEL”) During fiscal year ended March 26, 2021 and after the PSL Divestiture, Sanken, through PSL formed SEEL to cover its distribution business in Europe. The Company in connection with the TSA agreement with Sanken and PSL paid certain costs on behalf of them, and, as such, had related party accounts receivable from SEEL of none and $1,272 as of March 25, 2022 and March 26, 2021, respectively. Sublease Agreement In 2014, the Company, through one of its subsidiaries, entered into a sublease agreement with Sanken pursuant to which it subleases certain office building space in Japan from Sanken. The sublease automatically renews on an annual basis unless either party provides notice to the other party otherwise and can be terminated by either party upon providing six months’ notice. The Company made aggregate payments of approximately $200 to Sanken under the sublease agreement during each of the fiscal years 2022, 2021 and 2020. Consulting Agreement In September 2017 and prior to Reza Kazerounian becoming a member of the Company’s board of directors, the Company entered into a board executive advisor agreement, as amended in June 2018 (the “Consulting Agreement”), with Mr. Kazerounian, pursuant to which the Company engaged Mr. Kazerounian to serve as executive advisor to the board of directors and the office of Chief Executive Officer. The Consulting Agreement provides for a fee payable to Mr. Kazerounian on a monthly basis in exchange for his services (which fee was reduced from $30 per month to $19 per month in connection with Mr. Kazerounian’s appointment to the board of directors in June 2018), as well as a grant of 12,000 shares of the Company’s Class L common stock and a signing bonus of $54 in connection with the execution of the Consulting Agreement. The Consulting Agreement provides that if Mr. Kazerounian’s employment is terminated by the board of directors, he will be entitled to a severance payment in the amount of $180 as well as a six-month vesting acceleration of his shares of Class L common stock. The board of directors and Mr. Kazerounian each have the right to terminate the Consulting Agreement at any time. During the fiscal years ended March 25, 2022, March 26, 2021 and March 27, 2020, the Company paid aggregate fees of $260, $318 and $494, respectively, to Mr. Kazerounian pursuant to the Consulting Agreement.

On February 2, 2021, the Company filed a Registration Statement on Form S-1 for the public offering of shares owned by certain selling stockholders, including Sanken, OEP and certain of the Company’s officers and directors. The selling stockholders sold 19,332,852 shares of the Company’s common stock, including 1,832,852 shares of common stock sold by OEP in connection with the underwriters’ exercise of their over-allotment option. The Company did not sell any shares of its common stock and did not receive any of the proceeds from the offering. However, the Company incurred expenses, costs and fees in connection with the offering, including registration, filing and listing fees, printing fees and legal and accounting expenses, in the amount of $1,790 for the fiscal year ended March 26, 2021, which are included in selling, general and administrative expense in the accompanying consolidated statements of operations and comprehensive income.

Net sales of the Company’s products to Sanken totaled $148,813, $104,661 and $184,557 during the fiscal years ended March 25, 2022, March 26, 2021 and March 27, 2020, respectively. Trade accounts receivables, net of allowances from Sanken totaled $27,256 and $21,595 as of March 25, 2022 and March 26, 2021, respectively. Other accounts receivable from Sanken totaled $104 and $198 as of March 25, 2022 and March 26, 2021, respectively.

During fiscal year 2020, the Company acted as a distributor of Sanken’s products. Net sales of Sanken’s products by the Company to third parties totaled $35,421 during the fiscal year ended March 27, 2020. On March 28, 2020, the Company formally terminated its distribution agreement with Sanken to distribute Sanken’s products.

In May 2022, the Company issued a letter of intent with Sanken to develop a plan to transition the supply chain and sales activity in Japan from Sanken to the Company. During the planning process, both parties will define the transition timeline and method for customer communication, supply chain transfer and sales coverage. Parties will also define a method to continue engagement with Sanken on the support of select customers.

The Company, through its former wholly owned subsidiary, PSL, entered into a Development Agreement with Sanken whereby the Company and Sanken jointly own a specific wafer technology and share the reimbursement of development costs incurred by the Company. Sanken reimbursed $1,440 in fiscal year ended March 27, 2020. Sanken reimbursed no amounts in the fiscal years ended March 25, 2022 and March 26, 2021.

The Company, through PSL, its former wholly owned subsidiary, had related party debt owed to Sanken that includes three notes payable in the aggregate amount of $17,700 and two lines-of-credit agreements in the aggregate amount of $25,000 at March 27, 2020. The interest rates on the related party debt were reset at the beginning of each calendar quarter to LIBOR on the last trading day of the previous month, plus a 1.0% spread. Related party interest expense consisting of amounts due to Sanken for intercompany notes payable, lines-of-credit and miscellaneous charges for the fiscal year ended March 27, 2020 amounted to $1,444, and related party interest paid for the same period amounted to $1,538.

In accordance with the PSL Divestiture, the Company had both intercompany accounts payable of $1,198 and accounts receivable of $3,368 that were previously eliminated in consolidation. The previous intercompany receivable balance of $3,368 was moved into trade and other accounts receivable due from related party as of March 28, 2020. In addition, as a result of PSL taking over the Sanken distribution business, as of March 26, 2021, the Company reflected a related accounts receivable balance of $767. This amount includes reductions of $767 and $2,601 from payments made by PSL during the fiscal years ended March 25, 2022 and March 26, 2021, respectively. No accounts receivable balance was recorded as of March 25, 2022.

In May 2009, the Company entered into a technology development agreement (the “IC Technology Development Agreement”) with Polar Semiconductor, Inc. (“PSI”) (subsequently changed to Polar Semiconductor, LLC), and Sanken, pursuant to which the parties agreed upon the general terms under which they may, from time to time, undertake certain activities (the “IC Process Development Activities”) to develop new technologies to be used by PSI to manufacture products for the Company and Sanken, as well as the ownership and use of such technologies following their development. The IC Technology Development Agreement provides that the expenses for all IC Process Development Activities will be shared equally by the Company and Sanken on an annual basis (subject to any exceptions upon which the parties may agree from time to time), with such expenses being paid to PSL by Sanken in the form of an up-front annual fee, with PSL being

responsible for any expenses that exceed the amount of such fee. The IC Technology Development Agreement will continue in effect until such time as the Company, PSL and Sanken mutually agree to its termination or adopt a successor agreement, or in the event that the companies fail to agree upon the annual fee for that fiscal year within three months after the commencement of such fiscal year. During the fiscal year ended March 25, 2022, the Company (through PSL) received no fees from Sanken and paid no fees to PSL pursuant to the IC Technology Development Agreement. During each of the fiscal years ended March 26, 2021 and March 27, 2020, the Company (through PSL) received fees of $1,200 from Sanken pursuant to the IC Technology Development Agreement, and during the same periods the Company paid fees of $1,200 to PSL pursuant to the IC Technology Development Agreement.

In April 2015, PSL and Sanken entered into a discrete technology development agreement (as amended, the “Discrete Technology Development Agreement”), pursuant to which the parties agreed upon the general terms under which they, from time to time, undertook certain activities (the “Discrete Development Activities”) to develop new technologies to be used by PSL to manufacture products for Sanken, as well as the ownership and use of such technologies following their development. In June 2018, the Company, PSL and Sanken entered into an amendment to the Discrete Technology Development Agreement pursuant to which the parties agreed to the assignment of all rights and obligations of PSL under such agreement to the Company and to certain amendments to the terms of such agreement. The Discrete Technology Development Agreement provided that the expenses for all Discrete Development Activities to be shared equally by the Company and Sanken on an annual basis (subject to any exceptions upon which the parties agreed to from time to time). As of March 26, 2021, the Company had accrued $614 included in amounts due to related party under this agreement, which was paid in the first quarter of fiscal year 2022. The Discrete Technology Development Agreement terminated on March 31, 2021 in accordance with its terms.

Purchases of various products from PSL totaled $55,297 and $42,196 for the fiscal years ended March 25, 2022 and March 26, 2021, respectively. This amount includes none and $5,930 of price support payments made for the fiscal years ended March 25, 2022 and March 26, 2021, respectively. In accordance with the PSL Divestiture, the Company had intercompany accounts payable of $1,198 that was previously eliminated in consolidation. The previous intercompany payable balance of $1,198 was moved into amounts due to related party as of March 28, 2020. Accounts payable to PSL included in amounts due to related party totaled $5,222 and $1,739 as of March 25, 2022 and March 26, 2021, respectively. These amounts include reductions of $5,222 and $1,198 from payments made to PSL during the fiscal years ended March 25, 2022 and March 26, 2021, respectively.

On March 28, 2020, in connection with the PSL Divestiture, the Company contributed the forgiveness of the fair value of $15,000 out of the $66,377 total debt owed by PSL to the Company, which was previously eliminated in consolidation as of March 27, 2020. As a result of the PSL Divestiture, on March 28, 2020, the $51,377 note receivable from PSL was classified on the Company’s balance sheet as related party note receivable. The related party note receivable held by the Company had a maturity date of March 28, 2027 and bore interest at a rate of 2.70%, which was a market rate determined by IRS guidance at the time of the divestiture. The entire receivable of $51,377 plus accrued interest of $762 was repaid on October 14, 2020.

On December 2, 2021, AML entered into a loan agreement with PSL wherein PSL provided an initial promissory note to AML for a principal amount of $7,500 (the “Initial PSL Loan”). The Initial PSL Loan will be repaid in equal installments, comprising of principal and interest accrued at 1.26% per annum, over a term of four years with payments due on the first day of each calendar year quarter (April 1st, July 1st, October 1st, and January 1st). In addition, PSL has the option of borrowing up to an additional $7,500 on or around January 1, 2023 under the same terms of the PSL Loan (the “Secondary PSL Loan” and, together with the Initial PSL Loan, the “PSL Promissory Notes”). PSL has informed the Company of its intent to elect its option of the Secondary PSL Loan during fiscal year 2023. The loan funds will be used by PSL to procure a deep ultraviolet scanner and other associated manufacturing tools necessary to increase wafer fabrication capacity in support of the Company’s increasing wafer demand. As of March 25, 2022, the outstanding balance of the PSL Promissory Notes was $7,500. On April 1, 2022, PSL made a quarterly payment to AML of $500, which included $31 of interest income.

As part of the PSL Divestiture, the Company, PSL and Sanken entered into the Transition Services Agreement (“TSA”), pursuant to which the Company agreed, among other things, to provide certain human resources, legal and distribution support services to PSL following the consummation of the PSL Divestiture. The TSA provides that the

Company and its wholly owned subsidiaries AML and Allegro MicroSystems Europe Ltd. will provide such services in a manner generally consistent with the manner in which they were provided during the 12 months prior to the date of the TSA, and will not be obligated to perform any service in a manner that is materially more burdensome than the analogous services provided for or within its own organization or group during such 12-month period.

The services contemplated by the TSA include human resources, legal and distribution support services. The applicable service period for human resources and legal services is 12 months, and fees payable for such services are $50 per year, invoiced on a quarterly basis. The applicable service period for distribution support services is six months with respect to services provided in North America and South America, and nine months with respect to services provided in Europe. All distribution support services are to be provided on a cost plus 10% basis. The Company received $25 under the TSA during each of the fiscal years ended March 25, 2022 and March 26, 2021.

The TSA has an initial term of 12 months and may be extended for additional 12-month terms on an annual basis if the parties so agree prior to the expiration of the then-current term. Unless the TSA otherwise provides, PSL may terminate a specific service prior to the end of the term by providing at least 60 days’ prior written notice. The North America and South America portion of this agreement was terminated as of March 26, 2021.

During fiscal year ended March 26, 2021 and after the PSL Divestiture, Sanken, through PSL formed SEEL to cover its distribution business in Europe. The Company in connection with the TSA agreement with Sanken and PSL paid certain costs on behalf of them, and, as such, had related party accounts receivable from SEEL of none and $1,272 as of March 25, 2022 and March 26, 2021, respectively.

In 2014, the Company, through one of its subsidiaries, entered into a sublease agreement with Sanken pursuant to which it subleases certain office building space in Japan from Sanken. The sublease automatically renews on an annual basis unless either party provides notice to the other party otherwise and can be terminated by either party upon providing six months’ notice. The Company made aggregate payments of approximately $200 to Sanken under the sublease agreement during each of the fiscal years 2022, 2021 and 2020.

In September 2017 and prior to Reza Kazerounian becoming a member of the Company’s board of directors, the Company entered into a board executive advisor agreement, as amended in June 2018 (the “Consulting Agreement”), with Mr. Kazerounian, pursuant to which the Company engaged Mr. Kazerounian to serve as executive advisor to the board of directors and the office of Chief Executive Officer. The Consulting Agreement provides for a fee payable to Mr. Kazerounian on a monthly basis in exchange for his services (which fee was reduced from $30 per month to $19 per month in connection with Mr. Kazerounian’s appointment to the board of directors in June 2018), as well as a grant of 12,000 shares of the Company’s Class L common stock and a signing bonus of $54 in connection with the execution of the Consulting Agreement. The Consulting Agreement provides that if Mr. Kazerounian’s employment is terminated by the board of directors, he will be entitled to a severance payment in the amount of $180 as well as a six-month vesting acceleration of his shares of Class L common stock. The board of directors and Mr. Kazerounian each have the right to terminate the Consulting Agreement at any time. During the fiscal years ended March 25, 2022, March 26, 2021 and March 27, 2020, the Company paid aggregate fees of $260, $318 and $494, respectively, to Mr. Kazerounian pursuant to the Consulting Agreement.