[Form 4] Allegro MicroSystems, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Allegro MicroSystems insider sale by a senior officer. Roald G. Webster, identified as Vice President and Chief Accounting Officer and a director-level reporting person, reported an open-market sale of 8,266 shares of Allegro MicroSystems common stock on 08/22/2025 at a weighted average price of $32.8082 per share. After the transaction, the filing shows the reporting person beneficially owned 17,300 shares. The Form 4 was signed by an attorney-in-fact on 08/25/2025 and includes a disclosure that the reported price is a weighted average for multiple sale prices in the $31.830 to $32.795 range.

Positive

• Timely and complete disclosure of an insider sale on Form 4, including weighted-average pricing and post-transaction beneficial ownership
• Identification of reporting person and title (VP, Chief Accounting Officer) provides clear governance context

Negative

• Insider disposition of 8,266 shares reduced beneficial ownership to 17,300 shares, which may be interpreted negatively by some investors
• No disclosure of a Rule 10b5-1 trading plan or reason for the sale is included in the filing

Insights

Financial Analyst

TL;DR: Insider sold a portion of holdings; transaction appears routine and provides liquidity, not necessarily a signal on fundamentals.

The sale of 8,266 shares at a weighted average price of $32.8082 reduced the reporting person’s beneficial ownership to 17,300 shares. The filing documents a standard Section 16 disclosure of an open-market disposition with a price range across multiple executions. There is no accompanying information about the reason for the sale, any Rule 10b5-1 trading plan, or changes to other holdings, so the transaction should be interpreted as a disclosed insider sale without additional context on timing or intent.

Corporate Governance Expert

TL;DR: Compliance appears proper; Form 4 timely discloses sale and weighted-average pricing across multiple executions.

The report identifies the reporting person’s title and relationship to the issuer and includes the required explanation that the price is a weighted average of multiple sale prices. The Form 4 is signed by an attorney-in-fact and provides the necessary affirmation. There is no mention of a 10b5-1 plan or other insider arrangement in the filing, so governance review would note accurate disclosure but lack further explanatory detail.

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 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)
	VP, Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/22/2025

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	08/22/2025		S		8,266	D	$32.8082(1)	17,300	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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $32.795 to $31.830. The Reporting Person undertakes to provide to Allegro MicroSystems, Inc. ("ALGM"), any security holder of ALGM, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

	/s/ Raymond Myer, Attorney-in-Fact for Roald G. Webster	08/25/2025
	** 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 did the ALGM insider report on Form 4?

The filing reports that Roald G. Webster sold 8,266 shares of Allegro MicroSystems common stock on 08/22/2025 at a weighted average price of $32.8082 per share.

How many ALGM shares does the reporting person own after the sale?

The Form 4 shows the reporting person beneficially owned 17,300 shares following the reported transaction.

Was the sale executed at a single price?

No; the filing explains the reported price is a weighted average for sales executed across prices ranging from $31.830 to $32.795.

Does the Form 4 state the sale was pursuant to a 10b5-1 trading plan?

The filing does not indicate that the transaction was made under a Rule 10b5-1 plan.

Who signed the Form 4 and when?

The Form 4 was signed by Raymond Myer, Attorney-in-Fact for Roald G. Webster on 08/25/2025.