STX

SEC source: 0001137789-25-000222 · wk-form4_1757621126.xml · nonDerivative · entry 2

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,730

SEC source: 0001137789-25-000222 · wk-form4_1757621126.xml · nonDerivative · entry 1

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,590

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: 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 · balance_after: 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.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · derivative · entry 12

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 4,550 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · derivative · entry 11

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,988

Underlying: Ordinary Shares · 9,662 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · derivative · entry 10

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,260

Underlying: Ordinary Shares · 2,815 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · derivative · entry 9

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 9,007 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 8

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 471,788

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 7

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 474,088

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 6

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 469,538

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 5

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 474,421

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 464,759

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 466,182

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 463,367

SEC source: 0001137789-25-000221 · wk-form4_1757621119.xml · nonDerivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 467,919

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · derivative · entry 8

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 560 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · derivative · entry 7

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,549

Underlying: Ordinary Shares · 1,516 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · derivative · entry 6

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 807

Underlying: Ordinary Shares · 201 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · derivative · entry 5

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 1,198 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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 starting on September 9, 2022 and each one-year anniversary thereafter for a total vesting period of four years.

F2 · derivative.expiration_date: 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 starting on September 9, 2022 and each one-year anniversary thereafter for a total vesting period of four years.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · nonDerivative · entry 4

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,384

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · nonDerivative · entry 3

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,824

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · nonDerivative · entry 2

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,308

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000220 · wk-form4_1757621112.xml · nonDerivative · entry 1

Chong Kian Fatt · CIK 0001987421 · EVP Global Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,107

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes 30 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.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · derivative · entry 9

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 1,165 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · derivative · entry 8

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,958

Underlying: Ordinary Shares · 2,652 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · derivative · entry 7

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,397

Underlying: Ordinary Shares · 599 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · derivative · entry 6

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 1,408 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · nonDerivative · entry 4

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,971

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · nonDerivative · entry 3

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,806

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · nonDerivative · entry 2

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,154

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000219 · wk-form4_1757621099.xml · nonDerivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP & Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,555

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 6

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 458,912

F7 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $169.64 to $170.61. 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.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 5

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 465,912

F6 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $168.63 to $169.60. 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.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 471,627

F5 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $167.63 to $168.62. 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.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 477,470

F4 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $166.43 to $166.86. 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.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 477,870

F3 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $165.43 to $166.09. 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.

SEC source: 0001137789-25-000198 · wk-form4_1757017794.xml · nonDerivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 478,212

F1 · shares: All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 20, 2025.

F2 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $164.36 to $164.95. 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.

SEC source: 0001137789-25-000199 · wk-form4_1757017801.xml · nonDerivative · entry 3

Conyers Yolanda Lee · CIK 0001906375 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,305

F4 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $169.93 to $170.45. 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.

SEC source: 0001137789-25-000199 · wk-form4_1757017801.xml · nonDerivative · entry 2

Conyers Yolanda Lee · CIK 0001906375 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,648

F3 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $168.04 to $168.90. 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.

SEC source: 0001137789-25-000199 · wk-form4_1757017801.xml · nonDerivative · entry 1

Conyers Yolanda Lee · CIK 0001906375 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,981

F1 · shares: All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 5, 2024.

F2 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $164.36 to $164.92. 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.

SEC source: 0001137789-25-000195 · wk-form4_1756245663.xml · derivative · entry 1

Szlosek Thomas A · CIK 0001293167 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 470

Underlying: Ordinary Shares · 470 shares

Expires not disclosed

F1 · derivative.exercise_date: Consists of a grant of restricted share units (RSUs) awarded to the Reporting Person on August 23, 2025 under the Seagate Technology Holdings plc 2022 Equity Incentive Plan for no consideration. Each RSU represents a contingent right to receive one Ordinary Share of the Issuer. Subject to the Reporting Person's continuous service with the Issuer, shares will be released to the Reporting Person on the date of the next annual general meeting of shareholders of the Issuer following the end of the fiscal year ending on June 27, 2025.

F1 · derivative.expiration_date: Consists of a grant of restricted share units (RSUs) awarded to the Reporting Person on August 23, 2025 under the Seagate Technology Holdings plc 2022 Equity Incentive Plan for no consideration. Each RSU represents a contingent right to receive one Ordinary Share of the Issuer. Subject to the Reporting Person's continuous service with the Issuer, shares will be released to the Reporting Person on the date of the next annual general meeting of shareholders of the Issuer following the end of the fiscal year ending on June 27, 2025.

SEC source: 0001137789-25-000186 · wk-form4_1755900189.xml · derivative · entry 4

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,221

Underlying: Ordinary Shares · 1,221 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

SEC source: 0001137789-25-000186 · wk-form4_1755900189.xml · derivative · entry 3

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,070

Underlying: Ordinary Shares · 4,070 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

SEC source: 0001137789-25-000186 · wk-form4_1755900189.xml · derivative · entry 2

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,056

Underlying: Ordinary Shares · 7,056 shares

Expires not disclosed

F2 · derivative.exercise_date: Consists of a grant of Restricted Share Unit (RSU) awarded to the Reporting Person under the Plan, subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2026 and then in equal quarterly installments thereafter.

F2 · derivative.expiration_date: Consists of a grant of Restricted Share Unit (RSU) awarded to the Reporting Person under the Plan, subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2026 and then in equal quarterly installments thereafter.

SEC source: 0001137789-25-000186 · wk-form4_1755900189.xml · derivative · entry 1

Morris John Christopher · CIK 0001988271 · EVP & CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,816

Underlying: Ordinary Shares · 18,816 shares

Expires 2032-08-20

F1 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2022 Equity Incentive Plan the ("Plan") are subject to a four-year vesting schedule. Subject to continuous employment, 25% shall vest on August 20, 2026 and the remaining portion shall vest in equal monthly installments over the following three years for a total vesting period of four years.

SEC source: 0001137789-25-000185 · wk-form4_1755900182.xml · derivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,320

Underlying: Ordinary Shares · 6,320 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

SEC source: 0001137789-25-000185 · wk-form4_1755900182.xml · derivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,065

Underlying: Ordinary Shares · 21,065 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

SEC source: 0001137789-25-000185 · wk-form4_1755900182.xml · derivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,617

Underlying: Ordinary Shares · 25,617 shares

Expires not disclosed

F2 · derivative.exercise_date: Consists of a grant of Restricted Share Unit (RSU) awarded to the Reporting Person under the Plan, subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2026 and then in equal quarterly installments thereafter.

F2 · derivative.expiration_date: Consists of a grant of Restricted Share Unit (RSU) awarded to the Reporting Person under the Plan, subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2026 and then in equal quarterly installments thereafter.

SEC source: 0001137789-25-000185 · wk-form4_1755900182.xml · derivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,700

Underlying: Ordinary Shares · 153,700 shares

Expires 2032-08-20

F1 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2022 Equity Incentive Plan the ("Plan") are subject to a four-year vesting schedule. Subject to continuous employment, 25% shall vest on August 20, 2026 and the remaining portion shall vest in equal monthly installments over the following three years for a total vesting period of four years.

SEC source: 0001137789-25-000184 · wk-form4_1755900174.xml · derivative · entry 4

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,739

Underlying: Ordinary Shares · 2,739 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

SEC source: 0001137789-25-000184 · wk-form4_1755900174.xml · derivative · entry 3

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,129

Underlying: Ordinary Shares · 9,129 shares

Expires not disclosed

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2026.