Allegro Microsystems (ALGM) files initial Form 3 for new director Brian C. White

Rhea-AI Filing Summary

ALLEGRO MICROSYSTEMS, INC. filed an initial insider ownership report for director Brian C. White. This Form 3 establishes his status as a reporting person for the company’s equity securities. The filing shows no stock purchases, sales, option exercises, or other transactions.

Key Terms

Form 3, reporting person, derivative securities

3 terms

Form 3 regulatory

"filed an initial insider ownership report for director Brian C. White"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reporting person regulatory

"establishes his status as a reporting person for the company’s equity"

derivative securities financial

"indicating no reportable options, warrants, or other derivative securities"

Financial contracts whose value is tied to the price or performance of another asset, such as a stock, bond, commodity, index, or currency; examples include options, futures and swaps. They matter to investors because they let you protect against price swings, bet on future moves or gain larger exposure with less upfront cash—like using a lever or insurance policy on an investment—so they can amplify gains and losses and help manage portfolio risk.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

WHITE BRIAN C

(Last) (First) (Middle)

955 PERIMETER ROAD

(Street)

MANCHESTER NEW HAMPSHIRE 03103

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/17/2026

3. Issuer Name and Ticker or Trading Symbol
ALLEGRO MICROSYSTEMS, INC. [ ALGM ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Raymond Myer, Attorney-in-Fact for Brian C. White	06/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the ALGM Form 3 for Brian C. White report?

The Form 3 for ALLEGRO MICROSYSTEMS, INC. reports that Brian C. White is a director and a Section 16 reporting person. It is an initial ownership filing and does not list any equity transactions or derivative holdings.

Does the ALGM Form 3 show Brian C. White buying or selling shares?

No, the Form 3 does not show Brian C. White buying or selling any ALLEGRO MICROSYSTEMS, INC. shares. The transaction summary lists zero purchases, zero sales, and no other equity transactions in this filing.

What is the purpose of this ALGM Form 3 filing?

This Form 3 identifies Brian C. White as a director of ALLEGRO MICROSYSTEMS, INC. and establishes him as a reporting insider under SEC rules. It serves as a baseline before any future Form 4 or Form 5 transaction reports.

Are there any derivative securities disclosed for Brian C. White at ALGM?

No, the filing’s derivative summary is empty, indicating no reportable options, warrants, or other derivative securities for Brian C. White in this Form 3. All derivative-related transaction counts are shown as zero.

Does the ALGM Form 3 indicate large or unusual insider activity?

No, the Form 3 shows no insider trading activity for Brian C. White. All transaction counts, including buys, sells, gifts, tax withholding, and restructurings, are zero, indicating a routine initial ownership filing without trades.