Seagate Technology Holdings plc
US ˙ NasdaqGS ˙ IE00BKVD2N49

SecuritySTX / Seagate Technology Holdings plc
InstitutionGrimes & Company, Inc.
Latest Disclosed Ownership5,132 shares
Latest Disclosed Value $ 2,010,491
Grimes & Company, Inc. reports 84.54% increase in ownership of STX / Seagate Technology Holdings plc

On April 21, 2026 - Grimes & Company, Inc. filed a 13F-HR form disclosing ownership of 5,132 shares of Seagate Technology Holdings plc (US:STX) valued at $2,010,512 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 2,781 shares of Seagate Technology Holdings plc. This represents a change in shares of 84.54% during the quarter. The current value of the position is $4,827,621 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)
2026-04-21 2026-03-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 5,132 2,351 84.54 2,010 162.75 0.0462
2026-02-03 2025-12-31 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 2,781 468 20.23 766 40.11 0.0183
2025-10-27 2025-09-30 13F SEAGATE TECHNOLOGY HLDNGS PL ORD SHS G7997R103 2,313 2,313 546 0.0135
2016-10-24 2016-09-30 13F Seagate Technology COM G7945J104 0 -172,443 -100.00 0 -100.00
2016-07-25 2016-06-30 13F Seagate Technology COM G7945J104 172,443 -9,980 -5.47 4,201 -33.15 0.5614
2016-04-25 2016-03-31 13F Seagate Technology COM G7945J104 182,423 -2,956 -1.59 6,284 -7.53 0.8084
2016-02-03 2015-12-31 13F Seagate Technology COM G7945J104 185,379 47,678 34.62 6,796 10.16 0.9178
2015-10-08 2015-09-30 13F Seagate Technology COM G7945J104 137,701 2,545 1.88 6,169 -3.91 0.7937
2015-08-11 2015-06-30 13F Seagate Technology COM G7945J104 135,156 3,004 2.27 6,420 -6.63 0.9042
2015-04-24 2015-03-31 13F Seagate Technology COM G7945J104 132,152 132,152 6,876 1.6528
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.