Seagate Technology Holdings plc
US ˙ NasdaqGS ˙ IE00BKVD2N49

SecuritySTX / Seagate Technology Holdings plc
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership6,011 shares
Latest Disclosed Value $ 2,354,892
Vestmark Advisory Solutions, Inc. reports 147.57% increase in ownership of STX / Seagate Technology Holdings plc

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 6,011 shares of Seagate Technology Holdings plc (US:STX) valued at $2,354,869 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 2,428 shares of Seagate Technology Holdings plc. This represents a change in shares of 147.57% during the quarter. The current value of the position is $5,654,488 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.

Upgrade to unlock premium data and export to Excel .

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 6,011 3,583 147.57 2,355 252.40 0.0162
2026-02-06 2025-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 2,428 512 26.72 669 47.79 0.0090
2025-11-10 2025-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 1,916 -539 -21.96 452 27.68 0.0086
2025-08-06 2025-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 2,455 2,455 354 0.0051
2023-11-06 2023-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 0 -21,553 -100.00 0 -100.00
2023-08-07 2023-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 21,553 -2,750 -11.32 1,333 -17.00 0.0508
2023-05-09 2023-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 24,303 -6,745 -21.72 1,607 -1.65 0.0696
2023-01-20 2022-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 31,048 3,149 11.29 1,633 9.97 0.0796
2022-11-03 2022-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 27,899 1,984 7.66 1,485 -19.82 0.0828
2022-08-04 2022-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 25,915 -78 -0.30 1,852 -20.75 0.1058
2022-04-27 2022-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 25,993 -5,153 -16.54 2,337 -33.59 0.1323
2022-01-31 2021-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 31,146 -1,865 -5.65 3,519 29.19 0.1986
2021-11-15 2021-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 33,011 409 1.25 2,724 -4.99 0.1845
2021-08-09 2021-06-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 32,602 -1,174 -3.48 2,867 10.61 0.2040
2021-05-10 2021-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 33,776 -6,987 -17.14 2,592 2.29 0.2299
2021-02-04 2020-12-31 13F SEAGATE TECHNOLOGY SHS G7945M107 40,763 -457 -1.11 2,534 24.77 0.2843
2020-10-19 2020-09-30 13F SEAGATE TECHNOLOGY SHS G7945M107 41,220 564 1.39 2,031 3.20 0.2728
2020-08-13 2020-06-30 13F SEAGATE TECHNOLOGY SHS G7945M107 40,656 1,684 4.32 1,968 3.47 0.3045
2020-05-06 2020-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 38,972 4,405 12.74 1,902 -7.54 0.3718
2020-02-14 2019-12-31 13F SEAGATE TECHNOLOGY SHS G7945M107 34,567 -4,485 -11.48 2,057 -2.09 0.4221
2019-11-05 2019-09-30 13F SEAGATE TECHNOLOGY SHS G7945M107 39,052 -568 -1.43 2,101 12.53 0.3407
2019-08-20 2019-06-30 13F SEAGATE TECHNOLOGY SHS G7945M107 39,620 -628 -1.56 1,867 -3.11 0.3195
2019-05-14 2019-03-31 13F SEAGATE TECHNOLOGY SHS G7945M107 40,248 40,248 1,927 0.3436
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.