Seagate Technology CEO William Mosley Sells $4.19M in Shares Under Rule 10b5-1 Plan

Executive Summary

On November 3, 2026, William D. Mosley, Chief Executive Officer and Director of Seagate Technology Holdings plc (STX), filed a Form 4 disclosing the sale of 6,720 Ordinary Shares on November 2, 2026. The sales were executed in multiple tranches at weighted average prices ranging between $617.67 and $644.43 per share, generating aggregate gross proceeds of approximately $4.19 million.

Transaction Breakdown

• Date of Transaction: November 2, 2026
• Security: Ordinary Shares
• Transaction Code: S (Open-market sale)
• Shares Sold: 6,720 shares across 14 discrete weighted-average execution blocks
• Effective Weighted Average Price: ~$622.82 per share
• Gross Proceeds: $4,185,348.55
• Post-Transaction Direct Ownership: 346,108.25 shares

Context & Trading Plan (Rule 10b5-1)

According to footnote disclosure (F1), all transactions were executed pursuant to a pre-established Rule 10b5-1 trading plan adopted by Mr. Mosley on February 18, 2026. Rule 10b5-1 plans allow corporate insiders to set up automated, scheduled sales to avoid concerns regarding material non-public information (MNPI).

Ownership Impact and Market Significance

Prior to the transaction, Mr. Mosley held 352,828.25 shares directly. The disposition of 6,720 shares represents approximately 1.90% of his direct holdings. Because the transaction was executed under an existing Rule 10b5-1 trading plan and represents only a minor fraction of his overall equity stake, this filing carries Low trading significance and reflects routine executive portfolio management rather than a discretionary sentiment shift.