STX

SEAGATE TECHNOLOGY HLDNGS PL

Data as of 2026 Q2 (06-30) · 13F snapshot

Summary

SEAGATE TECHNOLOGY HLDNGS PL (STX) is held as common stock by 11 tracked hedge-fund managers, with a combined reported value of ~$4.34B; the largest are Stephen Mandel, Steven Cohen, Ken Griffin. 4 tracked managers also disclosed PUT or CALL positions, reported separately below. This quarter: 3 new, 5 added, 3 trimmed, 1 closed. 20 public STOCK Act / OGE trade disclosures are on record. Data as of 2026 Q2, from public SEC 13F filings, delayed up to ~45 days.

Attention · HighThis quarter · Heating up

Common-stock holders114 also report options

Congress trades20

Price$921.51vs quarter-end-4.51%

Sectors1

This quarter's moves

New3

Added5

Trimmed / sold4

Top holder

Stephen Mandel

Common-stock positions

PUT and CALL disclosures are excluded from these holder counts and values.

Stephen MandelNew large stake

Value $965.11M5.9% of portfolio1,000,1092026 Q2

Steven CohenBig add

Value $794.11M1.3% of portfolio822,9142026 Q2

Ken GriffinAdd

Value $729.05M0.4% of portfolio755,4952026 Q2

Izzy EnglanderAdd

Value $610.91M0.4% of portfolio633,0692026 Q2

Renaissance TechnologiesAdd

Value $441.35M0.6% of portfolio457,3532026 Q2

Chase ColemanNew large stake

Value $275.12M1.1% of portfolio285,1002026 Q2

Ray DalioTrim

Value $192.83M0.8% of portfolio199,8222026 Q2

Alex SacerdoteNew large stake

Value $143.34M1.2% of portfolio148,5432026 Q2

Stanley DruckenmillerBig add

Value $117.73M2.7% of portfolio122,0002026 Q2

Davidson KempnerTrim

Value $57.51M1.4% of portfolio59,6002026 Q2

Investor	Period	Value	Shares	% of portfolio	Action
Stephen Mandel	2026 Q2	$965.11M	1,000,109	5.9%	New large stake
Steven Cohen	2026 Q2	$794.11M	822,914	1.3%	Big add
Ken Griffin	2026 Q2	$729.05M	755,495	0.4%	Add
Izzy Englander	2026 Q2	$610.91M	633,069	0.4%	Add
Renaissance Technologies	2026 Q2	$441.35M	457,353	0.6%	Add
Chase Coleman	2026 Q2	$275.12M	285,100	1.1%	New large stake
Ray Dalio	2026 Q2	$192.83M	199,822	0.8%	Trim
Alex Sacerdote	2026 Q2	$143.34M	148,543	1.2%	New large stake
Stanley Druckenmiller	2026 Q2	$117.73M	122,000	2.7%	Big add
Davidson Kempner	2026 Q2	$57.51M	59,600	1.4%	Trim

PUT / CALL disclosures

Reported separately: 13F option values are not common-stock ownership and do not reveal the full strategy or economic exposure.

Ken GriffinPUT—

Value $3.05B— of portfolio3,164,7002026 Q2

Ken GriffinCALL—

Value $1.20B— of portfolio1,246,6002026 Q2

Izzy EnglanderCALL—

Value $227.84M— of portfolio236,1002026 Q2

Izzy EnglanderPUT—

Value $214.33M— of portfolio222,1002026 Q2

Paul Tudor JonesCALL—

Value $52.98M— of portfolio54,9002026 Q2

Steven CohenPUT—

Value $34.26M— of portfolio35,5002026 Q2

Paul Tudor JonesPUT—

Value $26.44M— of portfolio27,4002026 Q2

Steven CohenCALL—

Value $26.25M— of portfolio27,2002026 Q2

Investor	Period	Value	Shares	% of portfolio	Action
Ken GriffinPUT	2026 Q2	$3.05B	3,164,700	—	—
Ken GriffinCALL	2026 Q2	$1.20B	1,246,600	—	—
Izzy EnglanderCALL	2026 Q2	$227.84M	236,100	—	—
Izzy EnglanderPUT	2026 Q2	$214.33M	222,100	—	—
Paul Tudor JonesCALL	2026 Q2	$52.98M	54,900	—	—
Steven CohenPUT	2026 Q2	$34.26M	35,500	—	—
Paul Tudor JonesPUT	2026 Q2	$26.44M	27,400	—	—
Steven CohenCALL	2026 Q2	$26.25M	27,200	—	—

Insider Trading

Officers · directors · Form 4

Open-market purchases and sales (P/S)23

John Christopher Morris
EVP & CTO
Sell$106.5K
120 @ $887.92Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$453.2K
520 @ $871.56Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$908.4K
1,040 @ $873.49Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$282.6K
320 @ $883.08Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$245.9K
280 @ $878.38Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$862.3K
986 @ $874.50Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$138.9K
160 @ $868.11Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$872.4K
1,000 @ $872.42Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$666.2K
760 @ $876.54Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$652.9K
741 @ $881.16Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$818.3K
915 @ $894.27Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$366.7K
418 @ $877.36Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$852.6K
974 @ $875.35Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$34.5K
40 @ $863.66Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$69.2K
80 @ $865.11Traded 2026-09-21Filed 2026-09-22
John Christopher Morris
EVP & CTO
Sell$174.1K
200 @ $870.28Traded 2026-09-21Filed 2026-09-22
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$220.8K
280 @ $788.43Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$94.5K
120 @ $787.26Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$443.2K
560 @ $791.36Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$784.4K
1,000 @ $784.45Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$3.25M
4,147 @ $782.56Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$1.38M
1,760 @ $783.28Traded 2026-09-14Filed 2026-09-16
Ban Seng Teh
EVP & Chief Commercial Officer
Sell$817.6K
1,040 @ $786.14Traded 2026-09-14Filed 2026-09-16

Insider transactions are public SEC Form 4 disclosures (company officers, directors, 10% owners), for research only — not investment advice.

Public SEC 13F filings may appear up to 45 days after quarter-end; STOCK Act / OGE trade filings are generally due within 45 days but may be late. Partial data only — research, not investment advice.