STX

SEC source: 0001137789-21-000073 · wf-form4_163163140194058.xml · nonDerivative · entry 2

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,174

F1 · shares: These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of securities previously reported on one or more Forms 4 by the Reporting Person in accordance with Rule 16b-3.

SEC source: 0001137789-21-000073 · wf-form4_163163140194058.xml · nonDerivative · entry 1

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,768

F1 · shares: These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of securities previously reported on one or more Forms 4 by the Reporting Person in accordance with Rule 16b-3.

SEC source: 0001137789-21-000065 · wf-form4_163070060229667.xml · derivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 31,500 shares

Expires 2021-09-09

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: Options granted to the Reporting Person under the Seagate Technology Holdings plc 2012 Equity Incentive Plan (the "Plan") are subject to a four-year vesting schedule. One quarter of the options vested on September 9, 2015. The remaining options vested in equal monthly installments over the 36 months following September 9, 2015.

SEC source: 0001137789-21-000065 · wf-form4_163070060229667.xml · nonDerivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 550,613

F1 · shares: These Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by the Reporting Person.

F3 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $87.0600 to $87.6300. 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: 0001137789-21-000065 · wf-form4_163070060229667.xml · nonDerivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 567,672

F1 · shares: These Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $86.0600 to $87.0500. 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: 0001137789-21-000065 · wf-form4_163070060229667.xml · nonDerivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 582,113

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: 0001137789-21-000053 · wf-form4_162984344424755.xml · derivative · entry 3

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 7,695 shares

Expires 2021-08-21

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_price: Each RSU represents a contingent right to receive one Ordinary Share of the Issuer.

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2012 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares on August 21, 2018 and each one-year anniversary thereafter.

SEC source: 0001137789-21-000053 · wf-form4_162984344424755.xml · nonDerivative · entry 2

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,539

F1 · shares: These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of Restricted Share Units ("RSUs").

SEC source: 0001137789-21-000053 · wf-form4_162984344424755.xml · nonDerivative · entry 1

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,355

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: 0001137789-21-000051 · wf-form4_162863528921266.xml · derivative · entry 3

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 7,250 shares

Expires 2021-09-11

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: Options granted to the Reporting Person under the Seagate Technology Holdings plc 2012 Equity Incentive Plan (the "Plan") are subject to a four-year vesting schedule. One quarter of the options vested on September 11, 2015, and the remaining options vested in equal monthly installments over the 36 months following September 11, 2015.

SEC source: 0001137789-21-000051 · wf-form4_162863528921266.xml · nonDerivative · entry 2

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,489

SEC source: 0001137789-21-000051 · wf-form4_162863528921266.xml · nonDerivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,739

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: 0001137789-21-000063 · wf-form4_163009920785704.xml · nonDerivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 550,613

F5 · shares: On July 22, 2020, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 15,665 of the 62,660 Threshold Performance Share Units granted to Mr. Mosley on September 9, 2020. The 15,665 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000063 · wf-form4_163009920785704.xml · nonDerivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 534,948

F4 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 13,007 of the 52,027 Threshold Performance Share Units granted to Mr. Mosley on September 9, 2019. The 13,007 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000063 · wf-form4_163009920785704.xml · nonDerivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 521,941

F3 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 12,676 of the 50,706 Threshold Performance Share Units granted to Mr. Mosley on September 10, 2018. The 12,676 Ordinary Shares will vest on September 10, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000063 · wf-form4_163009920785704.xml · nonDerivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 509,265

F1 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 16,842 of the 67,367 Threshold Performance Share Units granted to Mr. Mosley on September 11, 2017. The 16,842 Ordinary Shares will vest on September 11, 2021, subject to continuous service through such date.

F2 · balance_after: Includes 13 Ordinary Shares purchased by Reporting Person on July 30, 2021 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: 0001137789-21-000062 · wf-form4_163009897278857.xml · nonDerivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,247

F1 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 1,758 of the 7,030 Threshold Performance Share Units granted to Mr. Teh on March 22, 2021. The 1,758 Ordinary Shares will vest on March 22, 2022, subject to continuous service through such date.

SEC source: 0001137789-21-000061 · wf-form4_163009866235205.xml · nonDerivative · entry 1

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,352

F1 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 2,813 of the 11,250 Threshold Performance Share Units granted to Mr. Naik on March 22, 2021. The 2,813 Ordinary Shares will vest on March 22, 2022, subject to continuous service through such date.

SEC source: 0001137789-21-000060 · wf-form4_163009820847197.xml · nonDerivative · entry 3

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,107

F3 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 3,629 of the 14,515 Threshold Performance Share Units granted to Mr. Romano on September 9, 2020. The 3,629 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000060 · wf-form4_163009820847197.xml · nonDerivative · entry 2

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,478

F2 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 3,615 of the 14,458 Threshold Performance Share Units granted to Mr. Romano on September 9, 2019. The 3,615 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000060 · wf-form4_163009820847197.xml · nonDerivative · entry 1

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,863

F1 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 6,537 of the 26,150 Threshold Performance Share Units granted to Mr. Romano on February 20, 2019. The 6,537 Ordinary Shares will vest on February 20, 2022, subject to continuous service through such date.

SEC source: 0001137789-21-000059 · wf-form4_163009781329987.xml · nonDerivative · entry 4

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,355

F5 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 3,629 of the 14,515 Threshold Performance Share Units granted to Mr. Nygaard on September 9, 2020. The 3,629 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000059 · wf-form4_163009781329987.xml · nonDerivative · entry 3

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,726

F4 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 3,615 of the 14,458 Threshold Performance Share Units granted to Mr. Nygaard on September 9, 2019. The 3,615 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000059 · wf-form4_163009781329987.xml · nonDerivative · entry 2

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,111

F3 · shares: On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 5,965 of the 23,862 Threshold Performance Share Units granted to Mr. Nygaard on September 10, 2018. The 5,965 Ordinary Shares will vest on September 10, 2021, subject to continuous service through such date.

SEC source: 0001137789-21-000059 · wf-form4_163009781329987.xml · nonDerivative · entry 1

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,146

F1 · shares: On July 22, 2020, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 5,647 of the 22,585 Threshold Performance Share Units granted to Mr. Nygaard on November 20, 2017. The 5,647 Ordinary Shares will vest on November 20, 2021, subject to continuous service through such date.

F2 · balance_after: Includes 378 Ordinary Shares purchased by Reporting Person on January 29, 2021 and 121 Ordinary Shares purchased by Reporting Person on July 30, 2021 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: 0001137789-21-000043 · wf-form4_162699280928718.xml · nonDerivative · entry 1

SCHUELKE KATHERINE · CIK 0001209874 · SVP, CLO & Corporate Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,073

F1 · shares: These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of restricted share units previously reported on one or more Forms 4 by the Reporting Person in accordance with Rule 16b-3.

SEC source: 0001137789-21-000130 · wf-form4_163650546520351.xml · nonDerivative · entry 1

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,173.9106

SEC source: 0001137789-21-000037 · wf-form4_162371851883540.xml · nonDerivative · entry 1

ZANDER EDWARD J · CIK 0001251587 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · The Edward and Mona Zander Trust dtd 4/19/93

Disclosed balance after: 37,615

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $97.43 to $97.75. 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.

SEC source: 0001137789-21-000035 · wf-form4_162371820583039.xml · nonDerivative · entry 1

CANNON MICHAEL R · CIK 0001201489 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,175

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $97.45 to $97.485. 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: 0001811019-21-000004 · wf-form4_162188706774118.xml · derivative · entry 3

Fochtman Jeffrey D. · CIK 0001811019 · SVP, Business & Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,023

Underlying: Ordinary Shares · 1,007 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.

F2 · derivative.exercise_price: Each restricted share unit ("RSU") represents a contingent right to receive one Ordinary Share of the Issuer.

F3 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on May 20, 2021 and each one-year anniversary thereafter.

F3 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on May 20, 2021 and each one-year anniversary thereafter.

SEC source: 0001811019-21-000004 · wf-form4_162188706774118.xml · nonDerivative · entry 2

Fochtman Jeffrey D. · CIK 0001811019 · SVP, Business & Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,440

F1 · shares: These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of Restricted Share Units ("RSUs").

SEC source: 0001811019-21-000004 · wf-form4_162188706774118.xml · nonDerivative · entry 1

Fochtman Jeffrey D. · CIK 0001811019 · SVP, Business & Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,788

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: 0001137789-21-000134 · wf-form5a_163736413731533.xml · nonDerivative · entry 4

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Stephen J. Luczo Revocable Trust dated January 26, 2001

Disclosed balance after: 202,199

F3 · shares: On May 14, 2021 the trustee of the Agatha Relota Luczo Revocable Trust gifted 40,000 Ordinary Shares from the Agatha Relota Luczo Revocable Trust.

SEC source: 0001137789-21-000125 · wf-form5_163494816277897.xml · nonDerivative · entry 2

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Stephen J. Luczo Revocable Trust dated January 26, 2001

Disclosed balance after: 125,941

F2 · shares: On May 12, 2021 the Reporting Person gifted 40,000 Ordinary Shares to the Agatha Relota Luczo Revocable Trust

SEC source: 0001137789-21-000125 · wf-form5_163494816277897.xml · nonDerivative · entry 1

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Stephen J. Luczo Revocable Trust dated January 26, 2001

Disclosed balance after: 165,941

F1 · shares: On May 12, 2021 the Reporting Person gifted 40,000 Ordinary Shares to the Luczo 2013 Perpetual Family Trust.

SEC source: 0001137789-21-000134 · wf-form5a_163736413731533.xml · nonDerivative · entry 3

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Agatha Relota Luczo Revocable Trust

Disclosed balance after: 242,199

F2 · shares: On May 12, 2021 the Reporting Person gifted 40,000 Ordinary Shares to the Agatha Relota Luczo Revocable Trust. The Reporting Person's spouse is sole beneficiary and trustee of the trust.

SEC source: 0001137789-21-000134 · wf-form5a_163736413731533.xml · nonDerivative · entry 2

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Stephen J. Luczo Revocable Trust dated January 26, 2001

Disclosed balance after: 202,199

F2 · shares: On May 12, 2021 the Reporting Person gifted 40,000 Ordinary Shares to the Agatha Relota Luczo Revocable Trust. The Reporting Person's spouse is sole beneficiary and trustee of the trust.

SEC source: 0001137789-21-000134 · wf-form5a_163736413731533.xml · nonDerivative · entry 1

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Stephen J. Luczo Revocable Trust dated January 26, 2001

Disclosed balance after: 242,199

F1 · shares: On May 12, 2021, the Reporting Person gifted 40,000 Ordinary Shares.

SEC source: 0001418812-21-000024 · primary_doc.xml · nonDerivative · entry 6

ValueAct Holdings, L.P. · CIK 0001418814 · Director · See Remarks

ValueAct Capital Master Fund, L.P. · CIK 0001464912 · Director · See Remarks

ValueAct Capital Master Fund B, L.P. · CIK 0001759805 · Director · See Remarks

VA Partners I, LLC · CIK 0001418812 · Director · See Remarks

ValueAct Capital Management, L.P. · CIK 0001351069 · Director · See Remarks

ValueAct Capital Management, LLC · CIK 0001351073 · Director · See Remarks

ValueAct Holdings II, L.P. · CIK 0001763309 · Director · See Remarks

ValueAct Holdings GP, LLC · CIK 0001418813 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes.

Disclosed balance after: 0

F1 · ownership.nature: Each reporting person listed herein disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

F3 · ownership.nature: The securities reported herein are held by ValueAct Capital Master Fund B, L.P. and may be deemed to be indirectly beneficially owned by (i) VA Partners I, LLC as General Partner of ValueAct Capital Master Fund B, L.P., (ii) ValueAct Capital Management, L.P. as the manager of ValueAct Capital Master Fund B, L.P., (iii) ValueAct Capital Management, LLC as General Partner of ValueAct Capital Management, L.P., (iv) ValueAct Holdings, L.P. as the majority owner of the membership interests of VA Partners I, LLC, (v) ValueAct Holdings II, L.P. as the sole owner of the membership interests of ValueAct Capital Management, LLC and as the majority owner of the limited partnership interests of ValueAct Capital Management, L.P., and (vi) ValueAct Holdings GP, LLC as General Partner of ValueAct Holdings, L.P. and ValueAct Holdings II, L.P.

SEC source: 0001418812-21-000024 · primary_doc.xml · nonDerivative · entry 5

ValueAct Holdings, L.P. · CIK 0001418814 · Director · See Remarks

ValueAct Capital Master Fund, L.P. · CIK 0001464912 · Director · See Remarks

ValueAct Capital Master Fund B, L.P. · CIK 0001759805 · Director · See Remarks

VA Partners I, LLC · CIK 0001418812 · Director · See Remarks

ValueAct Capital Management, L.P. · CIK 0001351069 · Director · See Remarks

ValueAct Capital Management, LLC · CIK 0001351073 · Director · See Remarks

ValueAct Holdings II, L.P. · CIK 0001763309 · Director · See Remarks

ValueAct Holdings GP, LLC · CIK 0001418813 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes.

Disclosed balance after: 17,377,070

F1 · ownership.nature: Each reporting person listed herein disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

F2 · ownership.nature: The securities reported herein are held by ValueAct Capital Master Fund, L.P. and may be deemed to be indirectly beneficially owned by (i) VA Partners I, LLC as General Partner of ValueAct Capital Master Fund, L.P., (ii) ValueAct Capital Management, L.P. as the manager of ValueAct Capital Master Fund, L.P., (iii) ValueAct Capital Management, LLC as General Partner of ValueAct Capital Management, L.P., (iv) ValueAct Holdings, L.P. as the majority owner of the membership interests of VA Partners I, LLC, (v) ValueAct Holdings II, L.P. as the sole owner of the membership interests of ValueAct Capital Management, LLC and as the majority owner of the limited partnership interests of ValueAct Capital Management, L.P., and (vi) ValueAct Holdings GP, LLC as General Partner of ValueAct Holdings, L.P. and ValueAct Holdings II, L.P.

SEC source: 0001418812-21-000024 · primary_doc.xml · nonDerivative · entry 4

ValueAct Holdings, L.P. · CIK 0001418814 · Director · See Remarks

ValueAct Capital Master Fund, L.P. · CIK 0001464912 · Director · See Remarks

ValueAct Capital Master Fund B, L.P. · CIK 0001759805 · Director · See Remarks

VA Partners I, LLC · CIK 0001418812 · Director · See Remarks

ValueAct Capital Management, L.P. · CIK 0001351069 · Director · See Remarks

ValueAct Capital Management, LLC · CIK 0001351073 · Director · See Remarks

ValueAct Holdings II, L.P. · CIK 0001763309 · Director · See Remarks

ValueAct Holdings GP, LLC · CIK 0001418813 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes.

Disclosed balance after: 3,024,004

F1 · ownership.nature: Each reporting person listed herein disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

F3 · ownership.nature: The securities reported herein are held by ValueAct Capital Master Fund B, L.P. and may be deemed to be indirectly beneficially owned by (i) VA Partners I, LLC as General Partner of ValueAct Capital Master Fund B, L.P., (ii) ValueAct Capital Management, L.P. as the manager of ValueAct Capital Master Fund B, L.P., (iii) ValueAct Capital Management, LLC as General Partner of ValueAct Capital Management, L.P., (iv) ValueAct Holdings, L.P. as the majority owner of the membership interests of VA Partners I, LLC, (v) ValueAct Holdings II, L.P. as the sole owner of the membership interests of ValueAct Capital Management, LLC and as the majority owner of the limited partnership interests of ValueAct Capital Management, L.P., and (vi) ValueAct Holdings GP, LLC as General Partner of ValueAct Holdings, L.P. and ValueAct Holdings II, L.P.

SEC source: 0001418812-21-000024 · primary_doc.xml · nonDerivative · entry 3

ValueAct Holdings, L.P. · CIK 0001418814 · Director · See Remarks

ValueAct Capital Master Fund, L.P. · CIK 0001464912 · Director · See Remarks

ValueAct Capital Master Fund B, L.P. · CIK 0001759805 · Director · See Remarks

VA Partners I, LLC · CIK 0001418812 · Director · See Remarks

ValueAct Capital Management, L.P. · CIK 0001351069 · Director · See Remarks

ValueAct Capital Management, LLC · CIK 0001351073 · Director · See Remarks

ValueAct Holdings II, L.P. · CIK 0001763309 · Director · See Remarks

ValueAct Holdings GP, LLC · CIK 0001418813 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes.

Disclosed balance after: 19,851,479

F1 · ownership.nature: Each reporting person listed herein disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

F2 · ownership.nature: The securities reported herein are held by ValueAct Capital Master Fund, L.P. and may be deemed to be indirectly beneficially owned by (i) VA Partners I, LLC as General Partner of ValueAct Capital Master Fund, L.P., (ii) ValueAct Capital Management, L.P. as the manager of ValueAct Capital Master Fund, L.P., (iii) ValueAct Capital Management, LLC as General Partner of ValueAct Capital Management, L.P., (iv) ValueAct Holdings, L.P. as the majority owner of the membership interests of VA Partners I, LLC, (v) ValueAct Holdings II, L.P. as the sole owner of the membership interests of ValueAct Capital Management, LLC and as the majority owner of the limited partnership interests of ValueAct Capital Management, L.P., and (vi) ValueAct Holdings GP, LLC as General Partner of ValueAct Holdings, L.P. and ValueAct Holdings II, L.P.

SEC source: 0001388390-21-000002 · wf-form4_162024595664671.xml · derivative · entry 4

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 77,754 shares

Expires 2022-09-09

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 · shares: The option exercise and sale of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F5 · derivative.exercise_date: One quarter of the options vested on September 9, 2016. The remaining options vested in equal monthly installments over the 36 months following September 9, 2016.

SEC source: 0001388390-21-000002 · wf-form4_162024595664671.xml · nonDerivative · entry 3

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 492,410

F1 · shares: The option exercise and sale of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F4 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $93.04 to $93.62. 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: 0001388390-21-000002 · wf-form4_162024595664671.xml · nonDerivative · entry 2

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 498,600

F1 · shares: The option exercise and sale of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F3 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $92.04 to $93.03. 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.

SEC source: 0001388390-21-000002 · wf-form4_162024595664671.xml · nonDerivative · entry 1

MOSLEY WILLIAM D · CIK 0001388390 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 570,164

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 · shares: The option exercise and sale of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2 · balance_after: Includes 538 Ordinary Shares purchased by Reporting Person on January 29, 2021 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: 0001764650-21-000004 · wf-form4_162024565392293.xml · derivative · entry 7

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,914

Underlying: Ordinary Shares · 16,978 shares

Expires 2026-09-09

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 · shares: The option exercises and sales of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F6 · derivative.exercise_date: Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2020. The remaining options vest in equal monthly installments over the 36 months following September 9, 2020.

F6 · derivative.expiration_date: Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2020. The remaining options vest in equal monthly installments over the 36 months following September 9, 2020.

SEC source: 0001764650-21-000004 · wf-form4_162024565392293.xml · derivative · entry 6

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,784

Underlying: Ordinary Shares · 62,380 shares

Expires 2026-02-20

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 · shares: The option exercises and sales of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F5 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan (the "Plan") are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on February 20, 2020. The remaining options vest in equal monthly installments over the 36 months following February 20, 2020.

F5 · derivative.expiration_date: Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan (the "Plan") are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on February 20, 2020. The remaining options vest in equal monthly installments over the 36 months following February 20, 2020.

SEC source: 0001764650-21-000004 · wf-form4_162024565392293.xml · nonDerivative · entry 5

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,326

F1 · shares: The option exercises and sales of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F4 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $93.03 to $94.00. 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: 0001764650-21-000004 · wf-form4_162024565392293.xml · nonDerivative · entry 4

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,829

F1 · shares: The option exercises and sales of Ordinary Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F3 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $91.99 to $92.97. 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.