STX

SEC source: 0001764650-21-000004 · wf-form4_162024565392293.xml · nonDerivative · entry 3

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,476

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.

F2 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $90.97 to $91.95. 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: 0001764650-21-000004 · wf-form4_162024565392293.xml · nonDerivative · entry 2

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,684

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.

SEC source: 0001764650-21-000004 · wf-form4_162024565392293.xml · nonDerivative · entry 1

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,706

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.

SEC source: 0001209874-21-000004 · wf-form4_162008025553599.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,505

Underlying: Ordinary Shares · 20,000 shares

Expires 2024-07-20

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 1) option exercises and sales of Ordinary Shares and 2) sales of Ordinary Shares each reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F4 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. One quarter of the options vested on July 20, 2018. Subject to continuous employment, the remaining options will vest in equal monthly installments over the 36 months following July 20, 2018. 14,587 of the options reported are currently exercisable.

SEC source: 0001209874-21-000004 · wf-form4_162008025553599.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,503

F1 · shares: The 1) option exercises and sales of Ordinary Shares and 2) sales of Ordinary Shares each reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

SEC source: 0001209874-21-000004 · wf-form4_162008025553599.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,543

F1 · shares: The 1) option exercises and sales of Ordinary Shares and 2) sales of Ordinary Shares each 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 $95.85 to $96.46. 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: 0001209874-21-000004 · wf-form4_162008025553599.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,699

F1 · shares: The 1) option exercises and sales of Ordinary Shares and 2) sales of Ordinary Shares each reported in this Form 4 were effected pursuant to 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 $94.79 to $95.74. 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: 0001209874-21-000004 · wf-form4_162008025553599.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,028

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 1) option exercises and sales of Ordinary Shares and 2) sales of Ordinary Shares each reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

SEC source: 0001418812-21-000024 · primary_doc.xml · nonDerivative · entry 2

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: 3,024,877

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 1

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: 19,852,193

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: 0001845312-21-000008 · wf-form4_162007940496069.xml · derivative · entry 3

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 83,120

Underlying: Ordinary Shares · 40,000 shares

Expires 2024-08-21

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_date: Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. One quarter of the options vested on August 21, 2018. Subject to the Reporting Person's continuous employment, the remaining options vest in equal monthly installments over the 36 months following August 21, 2018. 72,860 of the options reported are currently exercisable.

SEC source: 0001845312-21-000008 · wf-form4_162007940496069.xml · nonDerivative · entry 2

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,660

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $96.69 to $97.09. 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: 0001845312-21-000008 · wf-form4_162007940496069.xml · nonDerivative · entry 1

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,660

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: 0001137789-21-000025 · wf-form4_161964183832280.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: 282,199

SEC source: 0001137789-21-000025 · wf-form4_161964183832280.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: 297,199

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $92.08 to $92.36. 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.

SEC source: 0001845312-21-000004 · wf-form4_161661692887752.xml · derivative · entry 1

Naik Ravi · CIK 0001845312 · EVP & CIO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,000

Underlying: Ordinary Shares · 45,000 shares

Expires 2028-03-22

F1 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options will vest on March 22, 2022. The remaining options will vest in equal monthly installments over the 36 months following March 22, 2022.

SEC source: 0001801425-21-000006 · wf-form4_161661657526806.xml · derivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,120

Underlying: Ordinary Shares · 28,120 shares

Expires 2028-03-22

F1 · derivative.exercise_date: Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options will vest on March 22, 2022. The remaining options will vest in equal monthly installments over the 36 months following March 22, 2022.

SEC source: 0001854908-21-000004 · wf-form4_161739693653777.xml · derivative · entry 1

Arumugavelu Shankar · CIK 0001854908 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,896

Underlying: Ordinary Shares · 2,896 shares

Expires not disclosed

F1 · derivative.exercise_date: Consists of a grant of RSUs awarded to the Reporting Person under the Amended and Restated Seagate Technology plc 2012 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 earlier of (i) one year from the date of grant and (ii) the date of the next annual general meeting of shareholders of the Issuer following the end of the fiscal year ending on July 2, 2021, provided such annual general meeting is at least fifty (50) weeks after the immediately preceding fiscal year's annual general meeting.

F1 · derivative.expiration_date: Consists of a grant of RSUs awarded to the Reporting Person under the Amended and Restated Seagate Technology plc 2012 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 earlier of (i) one year from the date of grant and (ii) the date of the next annual general meeting of shareholders of the Issuer following the end of the fiscal year ending on July 2, 2021, provided such annual general meeting is at least fifty (50) weeks after the immediately preceding fiscal year's annual general meeting.

SEC source: 0001137789-21-000020 · wf-form4_161592895173462.xml · derivative · entry 4

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 194,384 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.

F3 · 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: 0001137789-21-000020 · wf-form4_161592895173462.xml · nonDerivative · entry 3

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: 397,199

F2 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $76.57 to $76.75. 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: 0001137789-21-000020 · wf-form4_161592895173462.xml · nonDerivative · entry 2

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $76.25 to $76.93. 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: 0001137789-21-000020 · wf-form4_161592895173462.xml · nonDerivative · entry 1

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 194,384

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: 0001801425-21-000004 · wf-form4_161592844917995.xml · derivative · entry 7

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,037

Underlying: Ordinary Shares · 778 shares

Expires 2024-09-11

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.

F5 · derivative.exercise_date: One quarter of the options vested on September 11, 2018. Subject to the Reporting Person's continuous employment, the remaining options vest in equal monthly installments over the 36 months following September 11, 2018.

SEC source: 0001801425-21-000004 · wf-form4_161592844917995.xml · derivative · entry 6

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 737 shares

Expires 2023-09-09

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: One quarter of the options vested on September 9, 2017. The remaining options vested in equal monthly installments over the 36 months following September 9, 2017.

SEC source: 0001801425-21-000004 · wf-form4_161592844917995.xml · derivative · entry 5

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 171 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.

F3 · 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: 0001801425-21-000004 · wf-form4_161592844917995.xml · nonDerivative · entry 4

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,489

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 $76.28 to $77.04. 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: 0001801425-21-000004 · wf-form4_161592844917995.xml · nonDerivative · entry 3

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,846

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: 0001801425-21-000004 · wf-form4_161592844917995.xml · nonDerivative · entry 2

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,068

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: 0001801425-21-000004 · wf-form4_161592844917995.xml · nonDerivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,331

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: 0001137789-21-000018 · wf-form4_161558349593217.xml · nonDerivative · entry 1

Tilenius Stephanie · CIK 0001534995 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,468

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $77.3801 to $77.4050. 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: 0001137789-21-000016 · wf-form4_161541085538303.xml · derivative · entry 4

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 127,600 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.

F2 · derivative.exercise_date: 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: 0001137789-21-000016 · wf-form4_161541085538303.xml · nonDerivative · entry 2

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $74.16 to $75.02. 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.

SEC source: 0001137789-21-000016 · wf-form4_161541085538303.xml · nonDerivative · entry 1

LUCZO STEPHEN J · CIK 0001248260 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 127,600

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: 0001209874-21-000002 · wf-form4_161523955069151.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,028

F1 · balance_after: Includes 262 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: 0001137789-21-000014 · wf-form4_161523892893431.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: 447,199

F1 · price: These Ordinary Shares were sold in multiple trades at prices ranging from $71.79 to $72.02. 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.

SEC source: 0001418812-21-000014 · primary_doc.xml · nonDerivative · entry 2

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: 3,105,373

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: 0001418812-21-000014 · primary_doc.xml · nonDerivative · entry 1

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: 19,905,850

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: 0001137789-21-000012 · wf-form4_161463358436123.xml · nonDerivative · entry 1

Geldmacher Jay L · CIK 0001462488 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,283

SEC source: 0001764650-21-000002 · wf-form4_161411682129086.xml · nonDerivative · entry 1

Romano Gianluca · CIK 0001764650 · EVP & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,326

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

F2 · balance_after: Includes 558 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: 0001801425-21-000002 · wf-form4_161403656934478.xml · derivative · entry 3

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,250

Underlying: Ordinary Shares · 10,000 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.

F2 · 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. 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: 0001801425-21-000002 · wf-form4_161403656934478.xml · nonDerivative · entry 2

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,160

SEC source: 0001801425-21-000002 · wf-form4_161403656934478.xml · nonDerivative · entry 1

Teh Ban Seng · CIK 0001801425 · EVP, Global Sales

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,160

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 558 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: 0001811019-21-000002 · wf-form4_161368512186042.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 781

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · derivative · entry 13

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 9,380 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.

F4 · derivative.exercise_date: Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. The remaining options vested in equal monthly installments over the 36 months following September 9, 2016.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · derivative · entry 12

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 7,800 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.

F3 · derivative.exercise_date: Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. The remaining options vested in equal monthly installments over the 36 months following September 9, 2015.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · derivative · entry 11

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,301

Underlying: Ordinary Shares · 11,509 shares

Expires 2024-11-20

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.

F2 · 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. One quarter of the options vested on November 20, 2018. Subject to the Reporting Person's continuous employment, the remaining options vest in equal monthly installments over the 36 months following November 20, 2018.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · derivative · entry 10

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,810

Underlying: Ordinary Shares · 10,000 shares

Expires 2024-11-20

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.

F2 · 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. One quarter of the options vested on November 20, 2018. Subject to the Reporting Person's continuous employment, the remaining options vest in equal monthly installments over the 36 months following November 20, 2018.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · nonDerivative · entry 8

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

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.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · nonDerivative · entry 7

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,380

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.

SEC source: 0001137789-21-000008 · wf-form4_161196346979646.xml · nonDerivative · entry 6

Nygaard Jeffrey D. · CIK 0001720273 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

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.