Richard Roy Grisenthwaite insider trades: Arm Holdings (ARM) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Richard reports to the SEC
Open-market buys and sales
1 trade reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 18, 2026 | ARM | ↓ Sell | 24,339 | $209.15 | $5.1M | Direct | May 19, 2026 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other ARM insiders
Open-market trades in the last 12 months
About Richard Roy Grisenthwaite's insider trades
Richard Roy Grisenthwaite is Chief Architect at Arm Holdings (ARM). Since May 18, 2026, Richard has reported no open-market purchases and 1 sale worth $5.1M on SEC Form 4. In the last 12 months: 1 sale ($5.1M).
Their filings also include option exercises (1 filing), grants and awards (1 filing), shares withheld for taxes (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every ARM insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.