Seagate Technology — Director's Dealing 2025

Sep 11, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology Holdings plc (STX)
CIK: 0001137789
Period of Report: 2025-09-09

Reporting Person: Morris John Christopher (EVP & CTO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-09	Ordinary Shares	M	1885	—	Acquired	23590	Direct
2025-09-09	Ordinary Shares	F	860	$191.59	Disposed	22730	Direct
2025-09-09	Ordinary Shares	M	499	—	Acquired	23229	Direct
2025-09-09	Ordinary Shares	F	228	$191.59	Disposed	23001	Direct
2025-09-09	Ordinary Shares	M	2526	—	Acquired	25527	Direct
2025-09-09	Ordinary Shares	F	1152	$191.59	Disposed	24375	Direct
2025-09-09	Ordinary Shares	M	560	—	Acquired	24935	Direct
2025-09-09	Ordinary Shares	F	256	$191.59	Disposed	24679	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-09	Restricted Share Unit	$0	M	1885	Disposed		Ordinary Shares (1885)	Direct
2025-09-09	Restricted Share Unit	$0	M	499	Disposed		Ordinary Shares (499)	Direct
2025-09-09	Restricted Share Unit	$0	M	2526	Disposed		Ordinary Shares (2526)	Direct
2025-09-09	Restricted Share Unit	$0	M	560	Disposed		Ordinary Shares (560)	Direct

Footnotes

F1: The amount of securities beneficially owned has been updated to reflect 8,676 shares held continuously by the reporting person since prior to becoming a reporting person director for the Company, but not previously reported due to an administrative oversight.

F2: Includes 168 Ordinary Shares purchased by Reporting Person on July 31, 2025 under the Issuer's Employee Stock Purchase Plan. Such acquisition is exempt from reporting pursuant to Rule 16b-3 under the Securities Exchange Act of 1934.

F3: Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology plc Equity Incentive Plan (the "Plan"). Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2022 and each one-year anniversary thereafter for a total vesting period of four years.

F4: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

F5: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

F6: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Such RSUs vested 100% on September 9, 2025, the first anniversary of the grant.