Richard Roy Grisenthwaite

Richard Roy Grisenthwaite: Chief Architect at Arm Holdings. What Richard Roy Grisenthwaite 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.

Arm Holdings (ARM)

Richard Roy Grisenthwaite holds 0 Arm Holdings shares (0.00% of the company), worth about $0.00 at the last price, according to the Form 4 of May 18, 2026.

• Share units: 118,443 (0.01%), $30.3M — Arm Holdings promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.

Declarations

• Arm Holdings (ARM) — Form 4 of May 18, 2026 (Chief Architect): grant or award of 5,217; option exercise or conversion of 2,046; 0 shares after 0001973239-26-000076
• Arm Holdings (ARM) — Form 3 of Mar 18, 2026 (Chief Architect); 326 shares after 0001973239-26-000045

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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