STX · Seagate Technology Holdings plc · Insider Trading

These Ordinary Shares were sold in multiple trades at prices ranging from $779.95 to $780.87. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $772.19 to $773.14. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $778.95 to $779.94. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $780.99 to $781.88. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

These Ordinary Shares were sold in multiple trades at prices ranging from $775.78 to $776.75. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $783.00 to $783.78. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $774.71 to $775.70. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $797.92 to $798.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $785.75 to $786.61. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $789.56 to $790.43. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $787.05 to $787.36. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $784.00 to $784.75. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

All sale transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on Febuary 11, 2026.

These Ordinary Shares were sold in multiple trades at prices ranging from $771.15 to $772.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $794.18 to $794.99. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $776.80 to $777.76. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $782.00 to $782.88. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $791.01 to $791.98. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $773.34 to $774.29. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $795.65 to $796.62. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

These Ordinary Shares were sold in multiple trades at prices ranging from $796.68 to $797.48. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

These Ordinary Shares were sold in multiple trades at prices ranging from $799.02 to $799.03. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $777.89 to $778.88. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

These Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by the Reporting Person on February 11, 2026.

Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

These Ordinary Shares were sold in multiple trades at prices ranging from $823.12 to $824.10. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

This sale of Ordinary Shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on April 30, 2026

These Ordinary Shares were sold in multiple trades at prices ranging from $846.84 to $847.62. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

This sale of Ordinary Shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on April 30, 2026

These Ordinary Shares were sold in multiple trades at prices ranging from $867.77 to $868.76. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $833.25 to $834.20. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

This sale of Ordinary Shares was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on April 30, 2026

These Ordinary Shares were sold in multiple trades at prices ranging from $860.06 to $861.02. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $827.17 to $828.10. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $839.72 to $840.44. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

These Ordinary Shares were sold in multiple trades at prices ranging from $822.05 to $823.03. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.