Allegro MicroSystems (ALGM) SVP sells stock, withholds shares for taxes

Rhea-AI Filing Summary

Allegro MicroSystems SVP and CHRO Erin Hagen reported two stock transactions in company shares. On March 2, 2026, Hagen completed an open-market sale of 2,598 shares of common stock at $35.00 per share, leaving 30,094 shares of direct ownership after the sale.

On February 27, 2026, Hagen disposed of 1,996 shares of common stock at $36.47 per share to cover taxes due upon the vesting of previously granted restricted stock units, as indicated by the footnote. Both transactions involve directly held common stock.

Insider Trade Summary

Net Seller: 2,598 shares ($90,930)

Net Sell 2 txns

Insider Hagen Erin

Role SVP, CHRO

Sold 2,598 shs ($91K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,598	$35.00	$91K
Tax Withholding	Common Stock	1,996	$36.47	$73K

Holdings After Transaction: Common Stock — 30,094 shares (Direct)

Footnotes (1)

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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^*

Hagen Erin

(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)
	SVP, CHRO

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		1,996(1)	D	$36.47	32,692	D
Common Stock	03/02/2026		S		2,598	D	$35	30,094	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 Erin Hagen	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).
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.

FAQ

What insider transactions did ALGM executive Erin Hagen report?

Erin Hagen reported two transactions in Allegro MicroSystems common stock. She sold 2,598 shares at $35.00 per share and disposed of 1,996 shares at $36.47 per share to cover taxes on vested restricted stock units.

How many Allegro MicroSystems (ALGM) shares did Erin Hagen sell in the open market?

Erin Hagen sold 2,598 shares of Allegro MicroSystems common stock in an open-market transaction. The sale was executed at a price of $35.00 per share and left her with 30,094 directly owned shares afterward.

Why did ALGM’s Erin Hagen dispose of 1,996 shares on February 27, 2026?

The 1,996 Allegro MicroSystems shares were withheld to cover taxes due upon vesting of previously granted restricted stock units. This tax-withholding disposition used shares valued at $36.47 each instead of a separate cash payment for the tax obligation.

What is Erin Hagen’s remaining Allegro MicroSystems share ownership after these transactions?

After the reported transactions, Erin Hagen directly owns 30,094 Allegro MicroSystems common shares. This figure reflects the open-market sale of 2,598 shares on March 2, 2026, following the earlier tax-related share withholding transaction.

Were both ALGM insider transactions by Erin Hagen regular sales?

No, only one was a regular open-market sale. The 2,598-share transaction at $35.00 was an open-market sale, while the 1,996-share transaction at $36.47 was a tax-withholding disposition tied to restricted stock unit vesting.