Allegro Microsystems (ALGM) accounting chief sells 5,217 shares in open-market trade

Rhea-AI Filing Summary

ALLEGRO MICROSYSTEMS, INC. executive Roald Graham Webster, the VP and Chief Accounting Officer, reported an open-market sale of company stock. He sold 5,217 shares of common stock at a price of $44.885 per share and now directly holds 13,106 shares following this transaction.

Insider Trade Summary

Net Seller: 5,217 shares ($234,165)

Net Sell 1 txn

Insider Webster Roald Graham

Role VP, Chief Accounting Officer

Sold 5,217 shs ($234K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,217	$44.885	$234K

Holdings After Transaction: Common Stock — 13,106 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 5,217 shares Sale price per share: $44.885 per share Shares held after sale: 13,106 shares

3 metrics

Shares sold 5,217 shares Open-market sale of common stock

Sale price per share $44.885 per share Price for the 5,217 sold shares

Shares held after sale 13,106 shares Direct ownership following transaction

Key Terms

open-market sale, Common Stock, Form 4

3 terms

open-market sale financial

"described as an open-market sale of 5,217 Allegro Microsystems common shares"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

"He sold 5,217 shares of common stock at a price of $44.885 per share"

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 regulatory

"as disclosed in the Form 4 insider trading report"

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.

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^*

Webster Roald Graham

(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)
	VP, Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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	05/21/2026		S		5,217	D	$44.885	13,106	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:

	/s/ Raymond Myer, Attorney-in-Fact for Roald G. Webster	05/22/2026
	** 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 Roald Graham Webster report?

Roald Graham Webster reported an open-market sale of Allegro Microsystems common stock. He sold 5,217 shares in a single transaction, as disclosed in the Form 4 insider trading report.

At what price did Roald Graham Webster sell ALGM common stock?

He sold Allegro Microsystems common stock at $44.885 per share. This price applies to the 5,217 shares reported in the Form 4 transaction for the VP and Chief Accounting Officer.

How many ALGM shares does Roald Graham Webster hold after the sale?

After the reported sale, Roald Graham Webster holds 13,106 shares of Allegro Microsystems common stock. This reflects his direct ownership position following the 5,217-share open-market sale.

Is the Roald Graham Webster ALGM transaction a buy or a sell?

The transaction is a sell. The Form 4 lists transaction code "S" and describes it as an open-market sale of 5,217 Allegro Microsystems common shares at $44.885 per share.

What role does Roald Graham Webster hold at Allegro Microsystems (ALGM)?

Roald Graham Webster is an officer of Allegro Microsystems, serving as VP and Chief Accounting Officer. His Form 4 filing reports personal trading activity in the company’s common stock.