Richard Roy Grisenthwaite
Insider
First SEC filing: March 18, 2026 · Latest: March 18, 2026
Insider at
Insider transactions
0 buys (P)
1 sells (S)
Net: $-5,090,502
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 18, 2026 | ARM | S | 24,339 | $209.15 | $5,090,502 | 0 Direct | -100.00% | Disposed | 47.0% (price as of 2026-10-02) |
| May 15, 2026 | ARM | A | 5,217 | · | · | 5,543 Direct | +1600.31% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 2,046 | · | · | 7,589 Direct | +36.91% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 14,595 | · | · | 22,184 Direct | +192.32% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | A | 4,158 | · | · | 26,342 Direct | +18.74% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 1,631 | · | · | 27,973 Direct | +6.19% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | A | 13,315 | · | · | 41,288 Direct | +47.60% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 4,352 | · | · | 45,640 Direct | +10.54% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | F | 21,301 | $209.16 | $4,455,317 | 24,339 Direct | -46.67% | Disposed | 47.0% (price as of 2026-10-02) |
| May 15, 2026 | ARM | A | 6,648 | · | · | 106,282 Direct | +6.67% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | A | 34,785 | · | · | 141,067 Direct | +32.73% | Acquired | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 2,046 | · | · | 139,021 Direct | -1.45% | Disposed | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 14,595 | · | · | 124,426 Direct | -10.50% | Disposed | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 1,631 | · | · | 122,795 Direct | -1.31% | Disposed | (price as of 2026-10-02) |
| May 15, 2026 | ARM | M | 4,352 | · | · | 118,443 Direct | -3.54% | Disposed | (price as of 2026-10-02) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 6,648 | Acquired |
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 34,785 | Acquired |
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 2,046 | Disposed |
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 14,595 | Disposed |
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 1,631 | Disposed |
| May 15, 2026 | ARM | Restricted Stock Units | Ordinary Shares | · | · | 4,352 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 6 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| March 18, 2026 | ARM | Ordinary Shares [F1] | 326 | Direct |
| March 18, 2026 | ARM | Restricted Stock Units | 36,005 | Direct |
| March 18, 2026 | ARM | Restricted Stock Units | 6,820 | Direct |
| March 18, 2026 | ARM | Restricted Stock Units | 48,652 | Direct |
| March 18, 2026 | ARM | Restricted Stock Units | 3,805 | Direct |
| March 18, 2026 | ARM | Restricted Stock Units | 4,352 | Direct |