Allegro MicroSystems (ALGM) SVP Erin Hagen sells 2,285 shares under plan

Rhea-AI Filing Summary

Allegro MicroSystems, Inc. executive Erin Hagen, SVP and Chief Human Resources Officer, reported a sale of 2,285 shares of common stock on 2026-08-10 at $44.39 per share. After this transaction, Hagen directly holds 31,052 shares. The sale was effected under a Rule 10b5-1 trading plan adopted on May 11, 2026.

Insider Trade Summary

Net Seller: 2,285 shares

Net Sell 1 txn

Insider Hagen Erin

Role SVP, CHRO

Sold 2,285 shs ($101K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	2,285	$44.39	$101K

Holdings After Transaction: Common Stock — 31,052 shares (Direct)

Footnotes (1)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 11, 2026. Details regarding the Reporting Person's trading plan were reported in Part II, Item 5 of the Issuer's Quarterly Report on Form 10-Q for the period ending June 26, 2026, filed with the SEC on July 31, 2026.

Key Figures

Shares sold: 2,285 shares Sale price per share: $44.39 Shares held after transaction: 31,052 shares +1 more

4 metrics

Shares sold 2,285 shares Common stock sale by Erin Hagen on 2026-08-10

Sale price per share $44.39 Per-share price for the 2026-08-10 common stock sale

Shares held after transaction 31,052 shares Direct holdings of Erin Hagen following the reported sale

Rule 10b5-1 plan adoption date May 11, 2026 Adoption date of the trading plan governing the reported sales

Key Terms

Rule 10b5-1 trading plan, Form 4, Quarterly Report on Form 10-Q, Common Stock

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported were effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Form 4 regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1"

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.

Quarterly Report on Form 10-Q regulatory

"Details regarding the trading plan were reported in the Issuer's Quarterly Report on Form 10-Q"

A quarterly report on Form 10-Q is a standardized financial filing public companies must submit to U.S. regulators every three months, summarizing recent financial results, cash flows, balance sheet changes, operations and material risks or legal developments. Investors treat it like a company report card that shows up-to-date facts rather than marketing copy, helping them track performance, spot trends, reassess risk and make buy or sell decisions.

Common Stock financial

"security_title: Common Stock for the reported transaction"

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.

FAQ

What insider transaction did Allegro MicroSystems (ALGM) report for Erin Hagen?

Allegro MicroSystems reported that Erin Hagen, SVP and CHRO, sold 2,285 shares of common stock on 2026-08-10 at $44.39 per share in a planned transaction under a Rule 10b5-1 trading plan.

How many Allegro MicroSystems (ALGM) shares does Erin Hagen hold after the reported sale?

Following the reported sale, Erin Hagen directly holds 31,052 shares of Allegro MicroSystems common stock. This post-transaction holding is stated in the ownership column of the Form 4 data for the 2026-08-10 transaction.

Was the Allegro MicroSystems (ALGM) insider sale by Erin Hagen under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected under a Rule 10b5-1 trading plan adopted by Erin Hagen on May 11, 2026, with additional plan details described in the company’s Form 10-Q.

What price did Erin Hagen receive per Allegro MicroSystems (ALGM) share sold?

The reported sale by Erin Hagen was executed at a price of $44.39 per share of Allegro MicroSystems common stock, as indicated by the transaction price field for the 2026-08-10 trade.

What role does Erin Hagen hold at Allegro MicroSystems (ALGM) in this Form 4?

In this Form 4, Erin Hagen is identified as an officer of Allegro MicroSystems with the title SVP, CHRO (Senior Vice President, Chief Human Resources Officer), indicating the transaction involves a senior executive.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 04:17 PM Accepted by SEC EDGAR 08/12/2026 - 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^*

Hagen Erin

(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)
	SVP, CHRO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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	08/10/2026		S		2,285(1)	D	$44.39	31,052	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 11, 2026. Details regarding the Reporting Person's trading plan were reported in Part II, Item 5 of the Issuer's Quarterly Report on Form 10-Q for the period ending June 26, 2026, filed with the SEC on July 31, 2026.

	/s/ Raymond Myer, Attorney-in-Fact for Erin E. Hagen	08/12/2026
	** 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)