Allegro MicroSystems (ALGM) CFO reports RSU tax-related share withholding

Rhea-AI Filing Summary

Allegro MicroSystems EVP, CFO & Treasurer Derek D’Antilio reported a tax-related share disposition. On this Form 4, 9,995 shares of common stock were withheld at a price of $36.47 per share to cover taxes due upon the vesting of previously granted restricted stock units. After this withholding, D’Antilio directly owns 216,776 Allegro MicroSystems shares.

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

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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^*

D'Antilio Derek

(Last) (First) (Middle)

955 PERIMETER ROAD

(Street)

MANCHESTER NH 03103

(City) (State) (Zip)

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)
	EVP, CFO & Treasurer

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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

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

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

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	02/27/2026		F		9,995(1)	D	$36.47	216,776	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 that were previously granted by the Issuer.

	/s/ Raymond Myer, Attorney-in-Fact for Derek P. D'Antilio	03/03/2026
	** 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).
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FAQ

What insider transaction did Allegro MicroSystems (ALGM) report for Derek D’Antilio?

Allegro MicroSystems reported that EVP, CFO & Treasurer Derek D’Antilio had 9,995 common shares withheld. The shares were used to cover taxes triggered by the vesting of previously granted restricted stock units, rather than representing an open-market sale transaction.

Was the Allegro MicroSystems (ALGM) Form 4 transaction an open-market sale?

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Shares were withheld by the company to satisfy tax obligations when restricted stock units vested, a common administrative step in equity compensation programs.

How many Allegro MicroSystems (ALGM) shares were involved in Derek D’Antilio’s tax withholding?

The filing shows 9,995 Allegro MicroSystems common shares were withheld. These shares satisfied tax liabilities arising from the vesting of previously granted restricted stock units, according to the Form 4’s transaction code F and accompanying explanatory footnote.

At what price were the Allegro MicroSystems (ALGM) shares valued for the tax-withholding transaction?

The 9,995 Allegro MicroSystems shares used for tax withholding were valued at $36.47 per share. This value is disclosed as the transaction price per share on the Form 4 and is used to determine the tax amount satisfied in shares.

How many Allegro MicroSystems (ALGM) shares does Derek D’Antilio own after the reported transaction?

After the tax-withholding disposition, Derek D’Antilio directly owns 216,776 Allegro MicroSystems common shares. This post-transaction holding figure is listed in the Form 4 and reflects his remaining direct ownership following the RSU-related share withholding.

What does transaction code "F" mean in the Allegro MicroSystems (ALGM) Form 4?

Transaction code “F” indicates shares were used to pay an exercise price or tax liability. In this case, 9,995 Allegro MicroSystems shares were withheld to cover taxes due upon vesting of restricted stock units previously granted to Derek D’Antilio.