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STX in the 13F filings

Seagate Technology Hldngs PL · CUSIP G7997R103

Sector · Technology hardware and equipmentTheme · AI infrastructure and semiconductors· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

Q3 2026: 5 of 95 managers have filed so far; the filing deadline is 16 November 2026. Its figures cover those filers only, so it is not yet a picture of the tracked managers.

Quarter end
30 Sep 2026
the date the book describes
Filed
9 Nov 2026
latest of these filings; the earliest 9 Nov 2026
Managers listing it
3
at least, of 95 tracked, among listed positions
Comparable managers
5
filed both Q2 2026 and Q3 2026; 3 listed it in both
Shares listed
383,082
combined, among listed positions
Reported value
$353m
combined, at the quarter end

Among the 5 comparable managers: 1 buyer (opened or added shares) and 1 seller (trimmed or exited), at least, among listed positions. Their net change in shares was -128,785.

Managers listing STX in Q3 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

3 of 3 holders

ActionFiling
Acadian Asset Management LLC293,799$271m0.32%Trimmed-154,1469 Nov 2026 (the filing on sec.gov)
Squarepoint Ops LLC89,243$82m0.09%Added+25,3619 Nov 2026 (the filing on sec.gov)
Baillie Gifford & Co40$37kunder 0.1%Held09 Nov 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2026 to Q3 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (0)

No new position among listed positions.

Exited (0)

No exit shown by a manager’s own filing.

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
21 in Q4 2024 to 3 in Q3 2026

Tracked managers listing it, at least.

020406020222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
STX by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20218$2.9bnn.a.n.a.
Q3 20219$2.4bnn.a.n.a.
Q4 202110$3.3bnn.a.n.a.
Q1 202210$2.3bnn.a.n.a.
Q2 202212$2.0bnn.a.n.a.
Q3 202210$1.5bnn.a.n.a.
Q4 202211$1.9bnn.a.n.a.
Q1 202310$2.6bnn.a.n.a.
Q2 202314$2.4bnn.a.n.a.
Q3 202316$3.1bnn.a.n.a.
Q4 202314$3.8bn78
Q1 202417$3.4bn108
Q2 202417$3.4bn107
Q3 202421$3.5bn159
Q4 202421$2.8bn166
Q1 202512$2.5bn78
Q2 202524$4.1bn187
Q3 202520$4.5bn813
Q4 202521$7.8bn1820
Q1 202630$13.7bn2713
Q2 202645$40.7bn3217
Q3 20263$353m11

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

STX and NVDA →STX and AVGO →STX and MU →Choose a stock to compare with STX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own STX, latest filings →Back to the 13F Explorer →