ALGM

SEC source: 0001193125-25-277649 · ownership.xml · nonDerivative · entry 1

Coleman Troy · CIK 0002090081 · SVP, General Manager, Products

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,530

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on November 11, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments on May 16, 2026, May 16, 2027, and May 16, 2028.

SEC source: 0001970184-25-000003 · ownership.xml · nonDerivative · entry 1

Webster Roald Graham · CIK 0001970184 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,300

F1 · price: The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $32.795 to $31.830. The Reporting Person undertakes to provide to Allegro MicroSystems, Inc. ("ALGM"), any security holder of ALGM, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001828865-25-000005 · ownership.xml · nonDerivative · entry 1

Lury Richard R. · CIK 0001828865 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,857

F1 · price: The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $31.80 to $31.83. The Reporting Person undertakes to provide to Allegro MicroSystems, Inc. ("ALGM"), any security holder of ALGM, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0000950170-25-105863 · ownership.xml · nonDerivative · entry 1

PUMA MARY G · CIK 0001158015 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,483

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-25-105862 · ownership.xml · nonDerivative · entry 1

Suzuki Yoshihiro · CIK 0001828872 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 213,560

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0001195846-25-000003 · ownership.xml · nonDerivative · entry 1

MARTIN JOSEPH R · CIK 0001195846 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,179

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0002016237-25-000003 · ownership.xml · nonDerivative · entry 1

Raubacher Jennie · CIK 0002016237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,976

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0001784973-25-000003 · ownership.xml · nonDerivative · entry 1

Lynch Susan D · CIK 0001784973 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,516

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0001345098-25-000004 · ownership.xml · nonDerivative · entry 1

Palepu Krishna G. · CIK 0001345098 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,961

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0001828865-25-000003 · ownership.xml · nonDerivative · entry 1

Lury Richard R. · CIK 0001828865 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,857

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-25-103065 · ownership.xml · nonDerivative · entry 1

Hagen Erin · CIK 0002022960 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,688

SEC source: 0000950170-25-085405 · ownership.xml · nonDerivative · entry 1

Lury Richard R. · CIK 0001828865 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,925

SEC source: 0000950170-25-083094 · ownership.xml · nonDerivative · entry 1

Lury Richard R. · CIK 0001828865 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,025

SEC source: 0000950170-25-074377 · ownership.xml · nonDerivative · entry 2

Doogue Michael · CIK 0001828862 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 215,549

F2 · shares: Represents shares withheld to cover taxes due upon the vesting of performance-vesting restricted stock units and RSUs that were previously granted by the Issuer.

SEC source: 0000950170-25-074376 · ownership.xml · nonDerivative · entry 2

Webster Roald Graham · CIK 0001970184 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,566

F2 · shares: Represents shares withheld to cover taxes due upon the vesting of performance-vesting restricted stock units and RSUs that were previously granted by the Issuer.

SEC source: 0000950170-25-074373 · ownership.xml · nonDerivative · entry 2

Hagen Erin · CIK 0002022960 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,731

F2 · shares: Represents shares withheld to cover taxes due upon the vesting of performance-vesting restricted stock units and RSUs that were previously granted by the Issuer.

SEC source: 0000950170-25-074372 · ownership.xml · nonDerivative · entry 2

Briansky Sharon · CIK 0001897651 · SVP, GC and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,136

F2 · shares: Represents shares withheld to cover taxes due upon the vesting of performance-vesting restricted stock units and RSUs that were previously granted by the Issuer.

SEC source: 0000950170-25-074371 · ownership.xml · nonDerivative · entry 2

D'Antilio Derek · CIK 0001904082 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 244,579

F2 · shares: Represents shares withheld to cover taxes due upon the vesting of performance-vesting restricted stock units and RSUs that were previously granted by the Issuer.

SEC source: 0000950170-25-074377 · ownership.xml · nonDerivative · entry 1

Doogue Michael · CIK 0001828862 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 237,279

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-074376 · ownership.xml · nonDerivative · entry 1

Webster Roald Graham · CIK 0001970184 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,514

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-074373 · ownership.xml · nonDerivative · entry 1

Hagen Erin · CIK 0002022960 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,630

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-074375 · ownership.xml · nonDerivative · entry 1

Madormo Richard · CIK 0002061106 · SVP, Worldwide Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,809

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-074372 · ownership.xml · nonDerivative · entry 1

Briansky Sharon · CIK 0001897651 · SVP, GC and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,848

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-074371 · ownership.xml · nonDerivative · entry 1

D'Antilio Derek · CIK 0001904082 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 274,490

F1 · shares: Represents an award of Restricted Stock Units ("RSUs") granted on May 15, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on May 16, 2026.

SEC source: 0000950170-25-071492 · ownership.xml · nonDerivative · entry 1

D'Antilio Derek · CIK 0001904082 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 209,392

F1 · shares: On each of May 16, 2022 and June 11, 2024, the Reporting Person was granted an award of performance-vesting restricted stock units (the "PSUs"). The PSUs were subject to the Issuer's attainment of certain performance objectives between one and three fiscal years, and all remaining unvested amounts under the PSUs are scheduled to vest in full on May 16, 2025 in the form of common stock. On May 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that the performance objective goals of the PSUs for the period ending March 28, 2025 had been met for the aggregate number of shares shown. Following certification, the awards remain subject to the time-based vesting conditions, with the amount shown scheduled to vest in full on May 16, 2025.

SEC source: 0000950170-25-071493 · ownership.xml · nonDerivative · entry 1

Doogue Michael · CIK 0001828862 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,053

F1 · shares: On each of May 16, 2022 and June 11, 2024, the Reporting Person was granted an award of performance-vesting restricted stock units (the "PSUs"). The PSUs were subject to the Issuer's attainment of certain performance objectives between one and three fiscal years, and all remaining unvested amounts under the PSUs are scheduled to vest in full on May 16, 2025 in the form of common stock. On May 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that the performance objective goals of the PSUs for the period ending March 28, 2025 had been met for the aggregate number of shares shown. Following certification, the awards remain subject to the time-based vesting conditions, with the amount shown scheduled to vest in full on May 16, 2025.

F2 · balance_after: The total number of securities beneficially owned directly that was previously reported was inadvertently understated by 6,160 shares due to an administrative error. This Form 4 reflects the corrected number of securities beneficially owned directly by the Reporting Person as of the transaction date.

SEC source: 0000950170-25-071491 · ownership.xml · nonDerivative · entry 1

Webster Roald Graham · CIK 0001970184 · VP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,749

F1 · shares: On June 11, 2024, the Reporting Person was granted an award of performance-vesting restricted stock units (the "PSUs"). The PSUs were subject to the Issuer's attainment of certain performance objectives over the Issuer's 2025 fiscal year, and the PSUs are scheduled to vest in full on May 16, 2025 in the form of common stock. On May 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that the performance objective goals of the PSUs for the period ending March 28, 2025 had been met for the aggregate number of shares shown. Following certification, the award remains subject to the time-based vesting conditions, with the amount shown scheduled to vest in full on May 16, 2025.

SEC source: 0000950170-25-071490 · ownership.xml · nonDerivative · entry 1

Hagen Erin · CIK 0002022960 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,477

F1 · shares: On June 11, 2024, the Reporting Person was granted an award of performance-vesting restricted stock units (the "PSUs"). The PSUs were subject to the Issuer's attainment of certain performance objectives over the Issuer's 2025 fiscal year, and the PSUs are scheduled to vest in full on May 16, 2025 in the form of common stock. On May 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that the performance objective goals of the PSUs for the period ending March 28, 2025 had been met for the aggregate number of shares shown. Following certification, the award remains subject to the time-based vesting conditions, with the amount shown scheduled to vest in full on May 16, 2025.

SEC source: 0000950170-25-071489 · ownership.xml · nonDerivative · entry 1

Briansky Sharon · CIK 0001897651 · SVP, GC and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,795

F1 · shares: On each of May 16, 2022 and June 11, 2024, the Reporting Person was granted an award of performance-vesting restricted stock units (the "PSUs"). The PSUs were subject to the Issuer's attainment of certain performance objectives between one and three fiscal years, and all remaining unvested amounts under the PSUs are scheduled to vest in full on May 16, 2025 in the form of common stock. On May 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that the performance objective goals of the PSUs for the period ending March 28, 2025 had been met for the aggregate number of shares shown. Following certification, the awards remain subject to the time-based vesting conditions, with the amount shown scheduled to vest in full on May 16, 2025.

SEC source: 0000950170-25-030872 · ownership.xml · nonDerivative · entry 1

D'Antilio Derek · CIK 0001904082 · EVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 188,097

F1 · kind: Represents an award of Restricted Stock Units ("RSUs") granted on February 27, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in full on February 27, 2026.

SEC source: 0000950170-25-030871 · ownership.xml · nonDerivative · entry 1

Hagen Erin · CIK 0002022960 · SVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,255

F1 · kind: Represents an award of Restricted Stock Units ("RSUs") granted on February 27, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in full on February 27, 2026.

SEC source: 0000950170-25-030870 · ownership.xml · nonDerivative · entry 1

Briansky Sharon · CIK 0001897651 · SVP, GC and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,139

F1 · kind: Represents an award of Restricted Stock Units ("RSUs") granted on February 27, 2025. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in full on February 27, 2026.

SEC source: 0000950170-25-012340 · ownership.xml · nonDerivative · entry 1

Palepu Krishna G. · CIK 0001345098 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,029

F1 · shares: Represents an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-128616 · ownership.xml · nonDerivative · entry 2

Doogue Michael · CIK 0001828862 · SVP, CTO

10b5-1 filing: No plan indicated

Ownership: Indirect · By the Michael C. Doogue Revocable Trust of 2015

Disclosed balance after: 246,086

SEC source: 0000950170-24-128616 · ownership.xml · nonDerivative · entry 1

Doogue Michael · CIK 0001828862 · SVP, CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,404

F1 · shares: Represents shares withheld to cover taxes due upon the vesting of restricted stock units that were previously granted by the Issuer.

SEC source: 0000950170-24-128615 · ownership.xml · nonDerivative · entry 1

Glover Max R. · CIK 0001828856 · SVP of Worldwide Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 266,339

F1 · shares: Represents shares withheld to cover taxes due upon the vesting of restricted stock units that were previously granted by the Issuer.

SEC source: 0000950170-24-122340 · ownership.xml · nonDerivative · entry 2

Nargolwala Vineet A · CIK 0001807649 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 356,113

SEC source: 0000950170-24-122340 · ownership.xml · nonDerivative · entry 1

Nargolwala Vineet A · CIK 0001807649 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 355,913

SEC source: 0000950170-24-102814 · ownership.xml · nonDerivative · entry 1

Narayan Suman · CIK 0001944292 · SVP, Products

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,084

F1 · shares: Represents shares withheld to cover taxes due upon the vesting of restricted stock units that were previously granted by the Issuer.

SEC source: 0000950170-24-094775 · ownership.xml · nonDerivative · entry 1

ALDRICH DAVID J · CIK 0001025092 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,746

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094774 · ownership.xml · nonDerivative · entry 1

MARTIN JOSEPH R · CIK 0001195846 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,247

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094773 · ownership.xml · nonDerivative · entry 1

Suzuki Yoshihiro · CIK 0001828872 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 207,628

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094772 · ownership.xml · nonDerivative · entry 1

SCHORR PAUL IV · CIK 0001195849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,199

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094771 · ownership.xml · nonDerivative · entry 1

Lynch Susan D · CIK 0001784973 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,584

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094769 · ownership.xml · nonDerivative · entry 1

Raubacher Jennie · CIK 0002016237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,044

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094770 · ownership.xml · nonDerivative · entry 1

Lury Richard R. · CIK 0001828865 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,874

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094768 · ownership.xml · nonDerivative · entry 1

PUMA MARY G · CIK 0001158015 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,551

F1 · shares: Transaction reported relates solely to an award of Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest on the date of the next annual meeting following the grant date.

SEC source: 0000950170-24-094326 · ownership.xml · nonDerivative · entry 1

Sanken Electric Co., Ltd. · CIK 0001830077 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,732,782

F1 · kind: Reflects a sale of shares to Allegro MicroSystems, Inc. (the "Issuer") pursuant to a Share Repurchase Agreement between the Issuer and the reporting person, dated as of July 23, 2024 (the "Agreement").

F2 · price: Represents a price per share determined pursuant to the terms of the Agreement, based on the per share public offering price, minus underwriting discounts, on July 24, 2024.

SEC source: 0000950170-24-089976 · ownership.xml · nonDerivative · entry 1

Nargolwala Vineet A · CIK 0001807649 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 351,113

F1 · shares: Transaction reported relates solely to shares withheld to cover taxes due upon the vesting of restricted stock units that were previously granted by the Issuer in connection with the Issuer's equity incentive plan.

SEC source: 0000950170-24-088209 · ownership.xml · nonDerivative · entry 1

Sanken Electric Co., Ltd. · CIK 0001830077 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,750,097

F1 · kind: Reflects a sale of shares to Allegro MicroSystems, Inc. (the "Issuer") pursuant to a Share Repurchase Agreement between the Issuer and the reporting person, dated as of July 23, 2024 (the "Agreement").

F2 · price: Represents a price per share determined pursuant to the terms of the Agreement, based on the per share public offering price, minus underwriting discounts, on July 24, 2024.