Allegro MicroSystems (NASDAQ: ALGM) CFO uses 37,840 shares to cover vesting taxes

Rhea-AI Filing Summary

ALLEGRO MICROSYSTEMS, INC. EVP, CFO & Treasurer Derek D'Antilio reported a tax-related share disposition. On the reported date, 37,840 shares of common stock were withheld at $43.10 per share to cover taxes due upon the vesting of previously granted restricted stock units and performance-vesting restricted stock units.

After this tax-withholding disposition, D'Antilio directly held 238,813 shares of Allegro common stock. This event reflects a routine administrative tax payment tied to equity compensation vesting rather than an open-market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider D'Antilio Derek

Role EVP, CFO & Treasurer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	37,840	$43.10	$1.63M

Holdings After Transaction: Common Stock — 238,813 shares (Direct, null)

Footnotes (1)

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Key Figures

Tax-withheld shares: 37,840 shares Share value for withholding: $43.10 per share Shares held after transaction: 238,813 shares +2 more

5 metrics

Tax-withheld shares 37,840 shares Shares withheld to cover taxes on RSU and performance RSU vesting

Share value for withholding $43.10 per share Valuation used for the tax-withholding disposition

Shares held after transaction 238,813 shares Direct common stock holdings following the tax-withholding event

Transaction code F Payment of tax liability by delivering securities

Transaction direction Dispose Classified as a tax-withholding disposition, not an open-market sale

Key Terms

restricted stock units, performance-vesting restricted stock units, tax-withholding disposition, Form 4, +1 more

5 terms

restricted stock units financial

"Represents shares withheld to cover taxes due upon the vesting of restricted stock units"

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

"and performance-vesting restricted stock units that were previously granted by the Issuer"

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" for the Form 4 entry"

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 regulatory

"INSIDER FILING DATA (Form 4): details the non-derivative tax-withholding transaction"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Common Stock financial

"security_title: "Common Stock" for the reported Allegro MicroSystems shares"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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^*

D'Antilio Derek

(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)
	EVP, CFO & Treasurer

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		37,840(1)	D	$43.1	238,813	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 Derek P. D'Antilio	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 Derek D'Antilio report on this Form 4?

Derek D'Antilio reported a tax-withholding disposition of Allegro MicroSystems common stock. The company withheld 37,840 shares to satisfy taxes due upon the vesting of previously granted restricted stock units and performance-vesting restricted stock units.

How many ALGM shares were involved in Derek D'Antilio's tax-withholding transaction?

The filing shows 37,840 common shares were withheld. These shares covered tax obligations arising when restricted stock units and performance-vesting restricted stock units vested, rather than reflecting an open-market sale initiated by the executive.

At what price were the ALGM shares valued for Derek D'Antilio’s tax withholding?

The withheld shares were valued at $43.10 per share for the tax-withholding transaction. This price is used to determine the value of stock delivered to meet the vesting-related tax liability tied to equity awards.

How many ALGM shares does Derek D'Antilio hold after this Form 4 transaction?

After the reported tax-withholding disposition, Derek D'Antilio directly holds 238,813 shares of Allegro MicroSystems common stock. This post-transaction balance reflects his remaining direct equity stake following satisfaction of vesting-related tax obligations.

Was Derek D'Antilio’s ALGM Form 4 transaction an open-market sale?

No, the Form 4 describes a tax-withholding disposition, not an open-market sale. Shares were withheld by the issuer to cover taxes triggered by the vesting of restricted stock units and performance-vesting restricted stock units previously granted.