Roald Graham Webster

Roald Graham Webster: VP, Chief Accounting Officer at Allegro MicroSystems. What Roald Graham Webster holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.

Allegro MicroSystems (ALGM)

Roald Graham Webster holds 13,106 Allegro MicroSystems shares (0.01% of the company), worth about $443,965.75 at the last price, according to the Form 4 of May 21, 2026.

• Shares held: 13,106 (0.01%), $443,965.75 — Held in their own name.

Declarations

• Allegro MicroSystems (ALGM) — Form 4 of May 21, 2026 (VP, Chief Accounting Officer): open-market sale of 5,217 at $44.89; 13,106 shares after 0001193125-26-236938
• Allegro MicroSystems (ALGM) — Form 4 of May 16, 2026 (VP, Chief Accounting Officer): shares withheld for tax of 4,277 at $43.10; 18,323 shares after 0001193125-26-231157
• Allegro MicroSystems (ALGM) — Form 4 of May 13, 2026 (VP, Chief Accounting Officer): grant or award of 4,756; grant or award of 544; 22,600 shares after 0001193125-26-226836
• Allegro MicroSystems (ALGM) — Form 4 of Aug 22, 2025 (VP, Chief Accounting Officer): open-market sale of 8,266 at $32.81; 17,300 shares after 0001970184-25-000003
• Allegro MicroSystems (ALGM) — Form 4 of May 16, 2025 (VP, Chief Accounting Officer): grant or award of 9,765; shares withheld for tax of 4,948 at $27.51; 25,566 shares after 0000950170-25-074376
• Allegro MicroSystems (ALGM) — Form 4 of May 13, 2025 (VP, Chief Accounting Officer): grant or award of 1,002; 20,749 shares after 0000950170-25-071491

Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.

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