Allegro MicroSystems director acquires stock grant

The DSUs are fully vested when granted and settle in whole common shares after separation from service, disability or death.

Rhea-AI Filing Summary

Allegro Microsystems, Inc. director Robert Willett acquired 618.982 deferred stock units (DSUs) on September 30, 2026, after electing to receive his quarterly cash board retainer as DSUs under the Deferred Compensation Plan for Non-Employee Directors. Each DSU represents a contingent right to one common share; his reported holdings became 4,869.982 DSUs. The award calculation used a $36.35 per-share fair market value.

The DSUs were fully vested when granted and will be settled in a lump sum in whole common shares after separation from service, disability or death, with cash in lieu of a fractional DSU.

Insider Trade Summary

Grant/Award: 618.982 shares

Grant/Award 1 txn

Insider Willett Robert

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Deferred Stock Units F1, F2, F3	618.982	$0.00	$0.00

Holdings After Transaction: Deferred Stock Units — 4,869.982 contracts (Direct)

Footnotes (3)

1. F1. Each deferred stock unit ("DSU") represents a contingent right to receive one share of the Issuer's Common Stock.
2. F2. As part of the Issuer's non-employee director compensation program, the reporting person elected to receive his quarterly cash board retainer fee in the form of DSUs pursuant to a prior election under the Issuer's Deferred Compensation Plan for Non-Employee Directors. The number of DSUs was calculated by dividing the quarterly cash retainer amount deferred by $36.35, the Fair Market Value of a share of the Issuer's Common Stock on the effective date of the deferral.
3. F3. The DSUs are fully vested when granted and will be settled in a lump sum in whole shares of the Issuer's Common Stock, with cash paid in lieu of any fractional DSU, following the reporting person's separation from service, disability, or death.

Key Figures

DSUs acquired: 618.982 DSUs Reported DSU holdings after grant: 4,869.982 DSUs Fair Market Value used in DSU calculation: $36.35 per share +1 more

4 metrics

DSUs acquired 618.982 DSUs September 30, 2026

Reported DSU holdings after grant 4,869.982 DSUs Following the September 30, 2026 grant

Fair Market Value used in DSU calculation $36.35 per share Value on the effective date of deferral

Common shares represented by each DSU 1 common share Each DSU represents a contingent right to receive one share

Key Terms

Deferred Stock Units, Deferred Compensation Plan for Non-Employee Directors, Fair Market Value, fully vested

4 terms

Deferred Stock Units financial

"Each deferred stock unit ("DSU") represents a contingent right"

Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.

Deferred Compensation Plan for Non-Employee Directors financial

"under the Issuer's Deferred Compensation Plan for Non-Employee Directors"

Fair Market Value financial

"the Fair Market Value of a share"

The price a willing buyer and a willing seller would agree on for an asset or security when neither is under pressure and both have access to the same information. Think of it as the market’s neutral estimate of what something is worth, like the price two neighbors would settle on for a car after comparing similar listings. Investors care because fair market value guides buying and selling decisions, tax reporting, portfolio valuation, and how accurately company assets are reflected in financial statements.

fully vested financial

"The DSUs are fully vested when granted"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many DSUs did ALGM director Robert Willett acquire?

Robert Willett acquired 618.982 DSUs on September 30, 2026. The DSUs represent contingent rights to receive common shares, and his reported holdings after the grant were 4,869.982 DSUs.

How was Robert Willett's ALGM retainer converted into DSUs?

Willett elected to receive his quarterly cash board retainer in DSUs under the Deferred Compensation Plan for Non-Employee Directors. The DSU count was calculated by dividing the deferred retainer amount by $36.35, the common stock's Fair Market Value on the effective date of deferral.

When will Robert Willett's ALGM DSUs be settled?

The DSUs were fully vested when granted and will be settled in a lump sum in whole shares of common stock after Willett's separation from service, disability or death. Cash will be paid in lieu of any fractional DSU.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/01/2026 - 04:16 PM Accepted by SEC EDGAR 10/01/2026 - 04:16 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Willett Robert

(Last) (First) (Middle)

955 PERIMETER ROAD

(Street)

MANCHESTER NEW HAMPSHIRE 03103

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ALLEGRO MICROSYSTEMS, INC. [ ALGM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Deferred Stock Units	(1)	09/30/2026		A		618.982(2)		(3)	(3)	Common Stock	618.982	$0(2)	4,869.982	D

Explanation of Responses:

1. Each deferred stock unit ("DSU") represents a contingent right to receive one share of the Issuer's Common Stock.

2. As part of the Issuer's non-employee director compensation program, the reporting person elected to receive his quarterly cash board retainer fee in the form of DSUs pursuant to a prior election under the Issuer's Deferred Compensation Plan for Non-Employee Directors. The number of DSUs was calculated by dividing the quarterly cash retainer amount deferred by $36.35, the Fair Market Value of a share of the Issuer's Common Stock on the effective date of the deferral.

3. The DSUs are fully vested when granted and will be settled in a lump sum in whole shares of the Issuer's Common Stock, with cash paid in lieu of any fractional DSU, following the reporting person's separation from service, disability, or death.

	/s/ Raymond Myer, Attorney-in-Fact for Robert J. Willett	10/01/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)