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Seagate Technology Holdings plc planned insider sales

In the last twelve months insiders at Seagate Technology Holdings plc filed 66 Form 144 notices of planned sales, 864,715 shares worth $610.1 million at the time of filing, from 16 sellers. The latest, filed 23 October 2026: Lee James CI (officer), 600 shares worth $379,785, planned for around 23 October 2026 through Morgan Stanley.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
23 October 2026Lee James CIOfficer600$379,78523 October 2026547 shares from 23 October 2026Morgan StanleyRestricted Stock Unit VestingForm 144
21 September 2026John C MorrisOfficer14,849$12.8 million21 September 202612,029 shares from 21 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; Performance Stock Units; Restricted Stock UnitsForm 144
15 September 2026Morris John ChristopherOfficer16,239$12.5 million15 September 202615,958 shares from 14 September 2026Morgan StanleyPerformance Share Unit VestingForm 144
15 September 2026Romano GianlucaOfficer52,483$40.5 million15 September 202650,938 shares from 14 September 2026Morgan StanleyPerformance Share Unit VestingForm 144
15 September 2026Ban Seng TehOfficer52,730$41.2 million15 September 202653,719 shares from 14 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
15 September 2026Mosley William DOfficer, Director102,784$79.4 million15 September 2026159,759 shares from 14 September 2026Morgan StanleyPerformance Share Unit VestingForm 144
14 September 2026Morris John ChristopherOfficer518$404,40514 September 2026None on Form 4 yetMorgan StanleyRestricted Stock Unit VestingForm 144
14 September 2026Ban Seng TehOfficer989$770,43114 September 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
14 September 2026Romano GianlucaOfficer1,003$783,39114 September 2026None on Form 4 yetMorgan StanleyRestricted Stock Unit VestingForm 144
14 September 2026Mosley William DOfficer, Director1,963$1.5 million14 September 2026None on Form 4 yetMorgan StanleyRestricted Stock Unit VestingForm 144
11 September 2026Gianluca RomanoOfficer50,498$43.5 million11 September 202651,846 shares from 10 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
10 September 2026Morris John ChristopherOfficer601$518,02210 September 2026572 shares from 10 September 2026Morgan StanleyRestricted Stock Unit VestingForm 144
10 September 2026Ban Seng TehOfficer663$570,24010 September 2026663 shares from 10 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
10 September 2026Romano GianlucaOfficer1,415$1.2 million10 September 2026None on Form 4 yetMorgan StanleyRestricted Stock Unit VestingForm 144
10 September 2026Mosley William DOfficer, Director2,992$2.6 million10 September 20262,849 shares from 10 September 2026Morgan StanleyRestricted Stock Unit VestingForm 144
1 September 2026Yolanda ConyersDirector750$621,2851 September 2026750 shares from 1 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
1 September 2026William D. MosleyDirector, Officer90,000$74.6 million1 September 202630,000 shares from 1 September 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; Restricted and Performance Stock UnitsForm 144
24 August 2026James LeeOfficer9,013$7.7 million24 August 20269,013 shares from 24 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; Restricted Stock UnitsForm 144
21 August 2026Morris John ChristopherOfficer3,575$3.0 million21 August 20264,038 shares from 20 August 2026Morgan StanleyRestricted Stock Unit VestingForm 144
21 August 2026Lee James CIOfficer4,000$3.4 million21 August 20263,939 shares from 21 August 2026Morgan StanleyRestricted Stock Unit VestingForm 144
21 August 2026Romano GianlucaOfficer9,135$7.8 million21 August 20269,076 shares from 21 August 2026Morgan StanleyRestricted Stock Unit VestingForm 144
21 August 2026Ban Seng TehOfficer9,862$8.4 million21 August 202615,910 shares from 20 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
21 August 2026Mosley William DOfficer, Director18,200$15.5 million21 August 202618,138 shares from 21 August 2026Morgan StanleyRestricted Stock Unit VestingForm 144
20 August 2026John MorrisOfficer523$435,42920 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock OptionsForm 144
20 August 2026Ban Seng TehOfficer6,048$5.1 million20 August 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesStock Option ExerciseForm 144
13 August 2026Ban Seng TehOfficer7,361$6.8 million13 August 20267,361 shares from 13 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Restricted Stock; Stock Option ExerciseForm 144
7 August 2026Gianluca RomanoOfficer22,211$18.9 million7 August 202622,211 shares from 7 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock units and performance stock unitsForm 144
30 July 2026James LeeOfficer694$530,51430 July 2026694 shares from 30 July 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
23 July 2026Lee James CIOfficer543$490,74123 July 2026542 shares from 23 July 2026Morgan StanleyRestricted Stock Unit VestingForm 144
12 June 2026Morris John ChristopherOfficer466$404,53012 June 20261,532 shares from 12 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
12 June 2026Romano GianlucaOfficer904$784,75312 June 2026903 shares from 12 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
12 June 2026Ban Seng TehOfficer989$870,50812 June 2026989 shares from 12 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
12 June 2026Mosley William DOfficer, Director1,769$1.5 million12 June 202661,768 shares from 12 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
11 June 2026Romano GianlucaOfficer1,351$1.2 million10 June 20261,350 shares from 10 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
11 June 2026Mosley William DOfficer, Director2,855$2.5 million10 June 20262,855 shares from 10 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
10 June 2026Morris John ChristopherOfficer574$503,26610 June 2026574 shares from 10 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock Unit VestingForm 144
10 June 2026Ban Seng TehOfficer663$544,89310 June 2026663 shares from 10 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
4 June 2026Shankar ArumugaveluDirector1,000$927,6804 June 20261,000 shares from 4 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
2 June 2026Pratik BhattDirector1,000$921,2602 June 20261,000 shares from 2 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
1 June 2026William D. MosleyDirector, Officer90,000$79.2 million1 June 202630,000 shares from 1 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Exercise of Stock Options; Restricted and Performance Stock UnitsForm 144
20 May 2026William D. MosleyDirector, Officer30,000$22.0 million20 May 202630,000 shares from 20 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; RSU & PSUsForm 144
14 May 2026Ban Seng TehOfficer8,003$6.5 million14 May 202615,560 shares from 13 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesStock Option ExerciseForm 144
13 May 2026Ban Seng TehOfficer7,557$6.1 million13 May 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesPerformance and Restricted StockForm 144
6 May 2026Gianluca RomanoOfficer24,390$18.8 million6 May 202624,390 shares from 6 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance Stock Units; Restricted Stock UnitsForm 144
5 May 2026Stephanie TileniusDirector1,580$1.2 million5 May 20261,580 shares from 5 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted stock vesting under a registered planForm 144
4 May 2026James LeeOfficer697$506,6704 May 2026697 shares from 4 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
4 May 2026John MorrisOfficer6,692$4.9 million4 May 20265,626 shares from 4 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Stock Units; Restricted Stock UnitsForm 144
1 April 2026William MosleyDirector, Officer20,000$7.8 million1 April 202620,000 shares from 1 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Stock Units; Restricted Stock UnitsForm 144
13 March 2026John MorrisOfficer112$41,88613 March 2026112 shares from 13 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
2 March 2026Yolanda ConyersDirector1,500$611,7602 March 2026750 shares from 2 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
2 March 2026William MosleyDirector, Officer20,000$8.2 million2 March 202644,584 shares from 2 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance Stock UnitsForm 144
24 February 2026John MorrisOfficer240$97,77624 February 2026240 shares from 24 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance Stock UnitsForm 144
23 February 2026Kian Fatt ChongOfficer5,846$2.4 million23 February 20265,846 shares from 23 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Shares; Restricted StockForm 144
2 February 2026William MosleyDirector, Officer20,000$8.2 million2 February 202620,000 shares from 2 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted and Performance Stock UnitsForm 144
29 January 2026Ban Seng TehOfficer20,195$8.9 million29 January 202620,195 shares from 29 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesEmployee Stock Purchase Plan; Performance Shares; Restricted Stock; Stock Option ExerciseForm 144
26 January 2026James LeeOfficer673$232,92526 January 2026673 shares from 26 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
12 January 2026Ban Seng TehOfficer1,412$422,62612 January 20261,412 shares from 12 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesStock Option ExerciseForm 144
2 January 2026William MosleyDirector, Officer20,000$5.5 million2 January 202620,000 shares from 2 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance Stock Units; Restricted Stock UnitsForm 144
15 December 2025John MorrisOfficer113$32,50315 December 2025113 shares from 15 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
11 December 2025Ban Seng TehOfficer2,010$594,75911 December 20252,010 shares from 11 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock; Stock Option ExerciseForm 144
2 December 2025Yolanda ConyersDirector750$202,5752 December 2025750 shares from 2 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
1 December 2025William MosleyDirector, Officer20,000$5.5 million1 December 202520,000 shares from 1 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRSUs/PSUsForm 144
12 November 2025James LeeOfficer697$204,91111 November 2025697 shares from 11 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
12 November 2025Ban Seng TehOfficer1,412$408,04011 November 20251,412 shares from 11 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesStock Option ExerciseForm 144
12 November 2025Gianluca RomanoOfficer62,023$17.9 million12 November 202562,023 shares from 12 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesExercise of Stock Options; Performance Stock Units; Restricted Stock UnitsForm 144
10 November 2025Shankar ArumugaveluDirector5,000$1.5 million10 November 20255,000 shares from 10 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?