Seagate Technology Holdings plc
US ˙ NasdaqGS ˙ IE00BKVD2N49

SecuritySTX / Seagate Technology Holdings plc
InstitutionState Street Corp
Latest Disclosed Ownership9,321,632 shares
Latest Disclosed Value $ 3,658,717,865
State Street Corp reports 0.52% decrease in ownership of STX / Seagate Technology Holdings plc

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 9,321,632 shares of Seagate Technology Holdings plc (US:STX) valued at $3,651,842,552 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,370,805 shares of Seagate Technology Holdings plc. This represents a change in shares of -0.52% during the quarter. The current value of the position is $8,768,766,006 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,321,632 -49,173 -0.52 3,658,718 41.40 0.1263
2026-02-13 2025-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,370,805 94,527 1.02 2,587,535 17.81 0.0868
2025-11-14 2025-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,276,278 274,913 3.05 2,196,420 68.24 0.0762
2025-08-14 2025-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,001,365 432,455 5.05 1,305,499 77.83 0.0489
2025-05-15 2025-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,568,910 -137,729 -1.58 734,129 -3.10 0.0303
2025-02-14 2024-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,706,639 203,965 2.40 757,603 -19.15 0.0299
2024-11-14 2024-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,502,674 541,585 6.80 937,081 13.23 0.0381
2024-08-14 2024-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 7,961,089 111,341 1.42 827,594 12.46 0.0362
2024-05-15 2024-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 7,849,748 -1,716,821 -17.95 735,878 -10.61 0.0329
2024-02-14 2023-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,566,569 283,834 3.06 823,249 33.09 0.0400
2023-11-14 2023-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,282,735 -628 -0.01 618,575 6.52 0.0343
2023-08-14 2023-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,283,363 -76,978 -0.82 580,718 -7.13 0.0305
2023-05-15 2023-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,360,341 819,501 9.60 625,307 37.33 0.0353
2023-05-15 2022-12-31 13F/A-99 SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,540,840 -410,615 -4.59 455,319 -5.68 0.0268
2023-05-15 2022-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,540,840 -410,615 455,319 0.0268
2022-11-15 2022-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,951,455 1,256,349 16.33 482,736 -13.03 0.0305
2022-08-15 2022-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 7,695,106 -377,997 -4.68 555,050 -24.10 0.0333
2022-05-16 2022-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 8,073,103 -1,294,281 -13.82 731,321 -31.32 0.0362
2022-02-14 2021-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,367,384 230,667 2.52 1,064,798 40.11 0.0505
2021-11-15 2021-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,136,717 -237,117 -2.53 759,998 -7.79 0.0402
2021-08-16 2021-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 9,373,834 184,040 2.00 824,241 15.86 0.0434
2021-07-09 2021-03-31 13F/A-1 SEAGATE TECHNOLOGY SHS G7945M107 9,189,794 -664,285 -6.74 711,402 14.92 0.0408
2021-05-17 2021-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 9,189,794 -664,285 711,402 0.0408
2021-02-16 2020-12-31 13F SEAGATE TECHNOLOGY SHS G7945M107 9,854,079 -396,129 -3.86 619,060 20.99 0.0379
2020-11-10 2020-09-30 13F SEAGATE TECHNOLOGY SHS G7945M107 10,250,208 -472,589 -4.41 511,680 -2.72 0.0349
2020-08-14 2020-06-30 13F SEAGATE TECHNOLOGY SHS G7945M107 10,722,797 186,349 1.77 525,963 0.96 0.0382
2020-06-19 2020-03-31 13F/A-1 SEAGATE TECHNOLOGY SHS G7945M107 10,536,448 -14,895 -0.14 520,954 -17.91 0.0456
2020-05-11 2020-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 10,536,448 -14,895 520,954 45,750.2507
2020-02-06 2019-12-31 13F SEAGATE TECHNOLOGY SHS G7945M107 10,551,343 102,840 0.98 634,623 11.62 0.0435
2019-11-14 2019-09-30 13F SEAGATE TECHNOLOGY SHS G7945M107 10,448,503 -364,085 -3.37 568,553 10.12 0.0424
2019-08-14 2019-06-30 13F SEAGATE TECHNOLOGY SHS G7945M107 10,812,588 -84,366 -0.77 516,284 -2.34 0.0385
2019-05-15 2019-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 10,896,954 377,084 3.58 528,670 28.16 0.0412
2019-02-12 2018-12-31 13F SEAGATE TECHNOLOGY SHS G7945M107 10,519,870 20,935 0.20 412,521 -17.02 0.0376
2018-11-09 2018-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,498,935 301,599 2.96 497,131 -13.67 0.0382
2018-08-14 2018-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,197,336 -88,635 -0.86 575,844 -4.34 0.0481
2018-05-15 2018-03-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,285,971 -398,175 -3.73 601,939 34.65 0.0511
2018-02-14 2017-12-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,684,146 -11,267 -0.11 447,028 26.01 0.0359
2017-11-14 2017-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,695,413 -281,057 -2.56 354,762 -16.59 0.0306
2017-08-14 2017-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,976,470 -277,001 -2.46 425,345 -17.71 0.0376
2017-05-15 2017-03-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 11,253,471 374,218 3.44 516,900 24.48 0.0461
2017-02-09 2016-12-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,879,253 498,500 4.80 415,249 3.77 0.0391
2017-01-13 2016-09-30 13F/A-1 SEAGATE TECHNOLOGY Common equity shares G7945M107 10,380,753 238,061 2.35 400,174 61.97 0.0403
2016-11-14 2016-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 7,261,135 279,912
2016-08-12 2016-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,142,692 -270,371 -2.60 247,073 -31.13 0.0265
2016-05-20 2016-03-31 13F/A-1 SEAGATE TECHNOLOGY Common equity shares G7945M107 10,413,063 -1,165,139 -10.06 358,730 -15.48 0.0388
2016-05-12 2016-03-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 10,413,063 358,730
2016-02-16 2015-12-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 11,578,202 -197,453 -1.68 424,449 -19.54 0.0464
2015-11-16 2015-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 11,775,655 -683,189 -5.48 527,546 -10.86 0.0614
2015-08-13 2015-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 12,458,844 -594,504 -4.55 591,810 -12.86 0.0633
2015-05-15 2015-03-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 13,053,348 -239,215 -1.80 679,161 -23.17 0.0697
2015-02-11 2014-12-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 13,292,563 84,698 0.64 883,959 16.86 0.0880
2014-11-12 2014-09-30 13F/A-1 SEAGATE TECHNOLOGY Common equity shares G7945M107 13,207,865 -171,971 -1.29 756,413 -0.51 0.0814
2014-11-10 2014-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 13,207,865 756,413
2014-08-12 2014-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 13,379,836 914,972 7.34 760,256 8.60 0.0821
2014-05-15 2014-03-31 13F/A-1 SEAGATE TECHNOLOGY Common equity shares G7945M107 12,464,864 -523,273 -4.03 700,031 -4.03 0.0796
2014-05-13 2014-03-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 12,464,864 700,031
2014-02-06 2013-12-31 13F/A-1 SEAGATE TECHNOLOGY Common equity shares G7945M107 12,988,137 881,962 7.29 729,415 37.75 0.0811
2014-02-06 2013-12-31 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 12,437,899 379,105
2013-11-12 2013-09-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 12,106,175 27,835 0.23 529,522 -2.21 0.0652
2013-08-08 2013-06-30 13F SEAGATE TECHNOLOGY Common equity shares G7945M107 12,078,340 12,078,340 541,471 0.0706
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.