Allegro Microsystems (NASDAQ: ALGM) VP uses 4,277 shares to pay tax on vested stock

Rhea-AI Filing Summary

ALLEGRO MICROSYSTEMS, INC. executive Roald Graham Webster, the VP and Chief Accounting Officer, reported a tax-related share disposition. On this Form 4, 4,277 shares of common stock were withheld at $43.10 per share to cover taxes due on previously granted restricted stock units and performance-vesting restricted stock units that vested.

These withheld shares were not an open-market sale but a payment of tax liability using company stock. After this withholding event, Webster directly holds 18,323 shares of Allegro common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Webster Roald Graham

Role VP, Chief Accounting Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	4,277	$43.10	$184K

Holdings After Transaction: Common Stock — 18,323 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares withheld for taxes: 4,277 shares Withholding price per share: $43.10 per share Shares held after transaction: 18,323 shares +1 more

4 metrics

Shares withheld for taxes 4,277 shares Common stock used for tax withholding on vesting awards

Withholding price per share $43.10 per share Value assigned to shares withheld for tax obligations

Shares held after transaction 18,323 shares Direct holdings of common stock following tax withholding

Tax-withholding transactions 1 transaction, 4,277 shares Summary of tax-withholding activity in this Form 4

Key Terms

restricted stock units, performance-vesting restricted stock units, tax-withholding disposition

3 terms

restricted stock units financial

"vesting of restricted stock units and performance-vesting restricted stock units that were previously granted"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

performance-vesting restricted stock units financial

"vesting of restricted stock units and performance-vesting restricted stock units that were previously granted"

Performance-vesting restricted stock units are a form of employee pay where future company shares are granted only if the business meets specific targets, such as revenue, profit, or stock-price goals. Think of them as a bonus you earn only when certain milestones are hit; for investors they matter because they can increase the number of shares outstanding if goals are met and they reveal how management is being motivated to hit particular financial or operational objectives.

tax-withholding disposition financial

"transaction_action: tax-withholding disposition to cover taxes due on vesting"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Form 4 Insider Transactions: What Each Field Means →

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^*

Webster Roald Graham

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/16/2026

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
Common Stock	05/16/2026		F		4,277(1)	D	$43.1	18,323	D

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

Explanation of Responses:

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

	/s/ Raymond Myer, Attorney-in-Fact for Roald G. Webster	05/19/2026
	** 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)

FAQ

What insider transaction did ALGM executive Roald Graham Webster report?

Roald Graham Webster reported a tax-related share disposition. 4,277 Allegro Microsystems common shares were withheld at $43.10 each to pay taxes owed on vesting restricted stock and performance-based awards granted earlier.

Was the ALGM Form 4 transaction an open-market sale of shares?

No, the transaction was not an open-market sale. The 4,277 Allegro Microsystems shares were withheld by the company to satisfy tax obligations arising from the vesting of restricted and performance-vesting stock units.

How many ALGM shares does Roald Graham Webster hold after this transaction?

After the tax-withholding transaction, Roald Graham Webster holds 18,323 Allegro Microsystems common shares directly. This figure reflects his remaining position following the shares withheld to cover taxes on vested equity awards.

What triggered the tax withholding of shares for ALGM’s Roald Graham Webster?

The withholding was triggered by equity awards vesting. Restricted stock units and performance-vesting restricted stock units granted earlier by Allegro Microsystems vested, creating a tax liability that was settled by withholding 4,277 shares.

What role does Roald Graham Webster hold at Allegro Microsystems (ALGM)?

Roald Graham Webster serves as Vice President and Chief Accounting Officer at Allegro Microsystems. His Form 4 filing reflects a routine tax-withholding event tied to his compensation in the form of restricted and performance-vesting stock units.