Arm Holdings CFO Jason Child Sells $3.12M in ADSs Under Rule 10b5-1 Plan

Executive Transaction Overview

On September 21, 2026, Jason Child, Chief Financial Officer of Arm Holdings plc (NASDAQ: ARM), executed an open-market sale of 10,400 ordinary shares (held as American Depositary Shares) at an average execution price of $300.00 per share, generating gross proceeds of $3,120,000.

Transaction Context & Plan Details

• Rule 10b5-1 Trading Plan: The transaction was conducted under a pre-established Rule 10b5-1 trading plan adopted on May 22, 2026, satisfying standard affirmative defense guidelines.
• Position Retention: Following the disposition, Jason Child retains direct ownership of 153,442 ordinary shares, representing approximately 93.6% of his pre-transaction equity position.
• ESPP Participation: Footnotes reflect that post-transaction holdings include 10 ordinary shares acquired on August 31, 2026, via the Arm Holdings plc 2024 Employee Stock Purchase Plan.

Market Impact Assessment

Given that the sale represents a modest reduction (~6.4%) of the CFO's overall direct holdings and was executed under a planned 10b5-1 framework, the filing indicates routine personal portfolio diversification rather than a discretionary sentiment-driven disposal.