ARM ARM HOLDINGS PLC /UK Insider Trading

ARM CCO William Abbey sells 6,566 shares for $2.6M; stock up 102.6% in 30 days, 241.4% in 90 days; prior ARM sales poorly timed

William Abbey, Chief Commercial Officer, executed 2 separate sales totaling 6,566 shares for $2,644,251.56 at a blended average price of $402.72, reducing his holdings by 24.2%. ARM stock has surged dramatically—up 102.6% over the prior 30 days and 241.4% over the prior 90 days—placing the transaction near the upper end of the 52-week range ($427.99 high). However, his prior trades at ARM reveal a consistent timing pattern: all 5 previous sales were followed by continued stock appreciation at the 90-day mark (ranging from +23.1% to +66.2%), meaning none of these prior sells were well-timed (0 of 5 well-timed at 90d). This poor historical timing at the same ticker—combined with selling into an exceptionally strong recent rally—raises questions about whether this transaction represents conviction-neutral activity or misalignment with subsequent price performance.

ARM CCO William Abbey sold 4,200 shares at $343.81 (2026-05-28); stock now +93.6% (30d), +235.9% (90d)

William Abbey, Chief Commercial Officer, sold 4,200 shares (13.4% of pre-transaction holdings) at $343.81, reducing his position from 31,329 to 27,129 shares. The timing of this sale is notable: ARM has delivered explosive gains of +93.6% over 30 days and +235.9% over 90 days since the transaction, with the current price of $408.85 sitting 14.7% above the 52-week high. His prior five sales at ARM (spanning 2026-04-24 through 2026-05-21) show a consistent pattern: none were well-timed at the 90-day mark, with returns ranging from +23.1% to +66.2%, indicating he has sold before each subsequent price advance. This current sale follows the same trajectory—the stock has continued its upward move despite his exit, extending a pattern where his ARM exits have systematically preceded material gains.

ARM CCO William Abbey sold 4,655 shares at $287.03 on 2026-05-21; holds 33,629 shares post-sale.

William Abbey, Chief Commercial Officer, sold 4,655 shares (4.7K shares) for a total value of $1,336,124.65 ($1.3M), reducing his holdings from 38,284 to 33,629 shares—a 12.2% reduction in his position. The sale occurred at $287.03, while ARM is currently trading at $306.51, suggesting the stock has appreciated since the transaction date. With ARM's strong recent momentum—up 55.9% over 30 days and 144.1% over 90 days—the transaction occurred during a period of significant appreciation for the company. The sale represents a modest portfolio adjustment by a senior executive, though the lack of additional context on timing or schedule limits inference about motivation.

ARM Chief People Officer Charlotte Claire Eaton sold all 7,805 shares for $2,263,520.50 on 2026-05-21

Charlotte Claire Eaton, ARM's Chief People Officer, executed 2 separate sales totaling 7,805 shares for $2,263,520.50 at a blended average price of $290.01, reducing her holdings to 0 shares. The transactions occurred as ARM trades at $306.51, up 2.6% from its 52-week high of $298.70 and within a 52-week range of $100.02–$298.70. The complete liquidation of her position warrants attention, particularly given the stock's 30-day change of +55.9% and 90-day change of +144.1% preceding the sale. As Chief People Officer at a $323.8B market-cap company, her exit from equity ownership removes an insider perspective from the cap table.

CLO Spencer Collins liquidated entire ARM stake (40.9K shares, $8.8M) at $215.00; stock now $298.23, +15.0% above 52-week high.

Spencer Collins (Chief Legal Officer) sold all 40,941 shares of ARM on 2026-05-19 at $215.00, resulting in complete elimination of his ARM position. Since the transaction, ARM has appreciated significantly to $298.23 current price, representing +15.0% above the 52-week high and +69.9% over 30 days. This reversal stands in stark contrast to Collins' prior ARM trading history: his 5 previous sales at this ticker all experienced positive 90-day returns (ranging from +21.4% to +23.6%), and none were well-timed by the 0.00% metric. The timing pattern of his prior sales—all conducted on the same date (2026-05-11)—followed by consistent appreciation suggests consistent downside execution. Collins' cross-ticker track record also shows 8 prior sells with an average 90d return of +21.6% and a 0.00% well-timed rate, reinforcing a pattern of selling into strength rather than before declines. Investors should note that after a full exit at $215, ARM has moved substantially higher, continuing the pattern observed in his same-ticker history.

ARM CCO William Abbey sells 15,956 shares in 2 transactions (May 19-20) for $3,743,857.60; holds 38,284 shares post-sale

William Abbey, Chief Commercial Officer of ARM Holdings, executed 2 separate sales totaling 15,956 shares for $3,743,857.60 at a blended average price of $234.64 over May 19–20. The stock now trades at $298.23 current price, representing +15.0% above the 52-week high of $259.44, and has appreciated 69.9% over the prior 30 days and 137.5% over 90 days. Abbey reduced his holdings by 29.4%, from 54,240 shares to 38,284 shares post-transaction. The sales occurred during a period of pronounced upward momentum in ARM's equity, with the stock at elevated valuations relative to its recent trading range.

ARM CFO Jason Child sells 31,920 shares ($7.2M) under scheduled 10b5-1 plan; stock up +69.9% in 30 days, +137.5% in 90 days

Jason Child executed a scheduled sale of 31,920 shares at $226.54 under a 10b5-1 trading plan adopted on 2025-05-30, reducing his ARM holdings by 15.5% to 174,232 shares. The sale occurred as the stock has appreciated significantly, with a 30-day return of +69.9% and 90-day return of +137.5% from the transaction date. His prior two sales at ARM produced 30-day returns of +42.6% and +58.3% respectively, while his cross-ticker track record across 2 prior sales averaged +50.4% (30-day) and +57.8% (90-day). Because this transaction is part of a pre-arranged trading plan, it reflects scheduled execution rather than a discretionary trading decision tied to current market conditions or valuation views.

ARM Chief People Officer sells 7,100 shares over 2 days for $1,913,055.00 total, reducing holdings by 47.6%

Charlotte Claire Eaton, Chief People Officer at ARM Holdings, executed 2 separate sales totaling 7,100 shares for $1,913,055.00 on May 20-21, 2026, at prices of $252.25 and $282.77 per share. This sale reduced her holdings from 14,905 shares to 7,805 shares (47.6% reduction in position). The stock has appreciated significantly in the past 90 days (+137.5%) and 30 days (+69.9%), and currently trades at $298.23, above the blended average sale price of $269.44. The substantial reduction in a senior executive's holdings warrants monitoring of whether this reflects portfolio management decisions or broader strategic considerations.

ARM CCO Abbey William sells 10,154 shares for $2.2M across 3 pre-arranged transactions via 10b5-1 plan

Abbey William, Chief Commercial Officer of ARM Holdings, executed 3 separate sales totaling 10,154 shares for $2,151,751.23 at prices ranging from $199.00 to $221.99, reducing his holdings by 15.8% from 64,394 to 54,240 shares. This transaction is part of a pre-arranged 10b5-1 trading plan, meaning the sales were scheduled in advance rather than discretionary, so no inference about timing or conviction can be drawn. At the current price of $223.15, the stock is up 33.8% over the prior 30 days and 75.4% over 90 days, indicating strong recent momentum. The sale occurred well before the stock's 52-week high of $239.50, which is within reachable distance from the execution prices.

ARM Chief Architect Richard Roy sold entire 24,339-share position ($5.1M) at $209.15; now holds zero shares.

Grisenthwaite Richard Roy, Chief Architect, completely exited his 24,339-share holding in ARM HOLDINGS PLC on 2026-05-18 for $5,090,501.85, reducing his position to 0 shares. The sale occurred at $209.15 per share while the stock currently trades at $223.15, representing a 6.8% gap between the transaction price and current price. This represents a complete departure from ARM for a C-level architect role holder, which is material given the insider's technical leadership position; however, without context regarding employment status changes, equity vesting schedules, or disclosed plans, the specific motivation remains opaque. The 90-day price momentum through the transaction date shows +75.4% appreciation, placing this sale within a sustained uptrend.