Chief Architect liquidates all direct shares in $5.09M open market sale
ARM has more than doubled off its 52-week low of $100.02.
Summary
Arm's Chief Architect, Richard Roy Grisenthwaite, sold all of his directly held shares for $5.09 million in an open market transaction, completely liquidating his direct ownership.
Key Events · Ownership and Investor Activity · ARM
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Officer Liquidates Direct Holdings
Richard Roy Grisenthwaite, Chief Architect, sold 24,339 shares in an open market transaction for $5,090,501.85, liquidating all of his direct holdings.
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Routine Compensation and Tax Events
The filing also reported the acquisition of shares totaling $10,135,613 through awards and option exercises, alongside the disposition of $4,455,317 in shares for tax withholding purposes.
Analysis · ARM · Manufacturing
Richard Roy Grisenthwaite, Chief Architect, sold all of his directly held shares for $5.09 million in an open market transaction. This complete liquidation of direct holdings by an officer, following a similar event by the Chief Legal Officer earlier this month, could be interpreted as a negative signal regarding the company's near-term stock performance, despite the dollar amount being small relative to Arm's massive market capitalization.
How filings like this one have moved
In the 30 days to Sep 15, 2026, 29.9% of the 1678 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.25%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, ARM was trading at $223.68 on NASDAQ in the Manufacturing sector, with a market capitalization of approximately $228.9B. The 52-week trading range was $100.02 to $239.50. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.