Seagate Technology Holdings plc

STX

Exchange: Nasdaq
Industry: Computer Storage Devices
SEC CIK: 0001137789

SEC filings (opens in a new tab)

In the last 90 days, Seagate Technology Holdings plc insiders filed 0 open-market purchases and 34 sales; 1,973 institutions reported holding it in 13F filings for Q2 2026, worth $181.1B in total; 5 superinvestors hold it, including Lone Pine Capital and Tiger Global Management.

13F holders, Q3 2026

Institutional positions in Seagate Technology Holdings plc as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 8; 0 vs. Q2 2026
Shares held: 276.8K; −55.9K (−16.8%) vs. Q2 2026
Total value: $252.8M; −$68.1M (−21.2%) vs. Q2 2026
New holders: 1; 1 more added
Sold out: 1; 4 more reduced

1,965 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting STX on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding STX and their total value by quarter
Quarter	Holders	Value
Q2 2026	1,973	$181.1B
Q1 2026	1,472	$74.2B
Q4 2025	1,280	$53.5B
Q3 2025	1,126	$45.8B
Q2 2025	956	$28.8B
Q1 2025	801	$16.9B
Q4 2024	806	$16.6B
Q3 2024	821	$20.4B
Q2 2024	799	$19.3B
Q1 2024	768	$17.2B
Q4 2023	730	$16.2B
Q3 2023	657	$12.3B
Q2 2023	660	$11.0B
Q1 2023	673	$12.1B
Q4 2022	643	$9.40B
Q3 2022	666	$9.29B
Q2 2022	714	$12.5B
Q1 2022	703	$15.4B
Q4 2021	794	$20.4B
Q3 2021	694	$15.2B
Q2 2021	679	$16.2B
Q1 2021	678	$15.5B

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Seagate Technology Holdings plc; share changes are against Q2 2026.

Institutions holding STX in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Hancock Whitney Corp	–	–	–	–	Not filed
Dymon Asia Capital (Singapore) Pte. Ltd.	–	–	–	–	Not filed
Talos Asset Management LP	–	–	–	–	Not filed
Investment Management Corp of Ontario	–	–	–	–	Not filed
Intech Investment Management LLC	–	–	–	–	Not filed
Varma Mutual Pension Insurance Co	–	–	–	–	Not filed
British Columbia Investment Management Corp	–	–	–	–	Not filed
ARS Investment Partners, LLC	–	–	–	–	Not filed
Ilmarinen Mutual Pension Insurance Co	–	–	–	–	Not filed
CIBC Bancorp USA Inc.	–	–	–	–	Not filed
Harvest Fund Management Co., Ltd	–	–	–	–	Not filed
Affinity Wealth Management LLC	–	–	–	–	Not filed
Hanson & Doremus Investment Management	–	–	–	–	Not filed
Delta Global Management LP	–	–	–	–	Not filed
Omers Administration Corp	–	–	–	–	Not filed
Old Port Advisors	–	–	–	–	Not filed
D1 Capital Partners L.P.SuperinvestorD1 Capital Partners	–	–	–	–	Not filed
ASR Vermogensbeheer N.V.	–	–	–	–	Not filed
GWM Advisors LLC	–	–	–	–	Not filed
Los Angeles Capital Management LLC	–	–	–	–	Not filed
Liontrust Investment Partners LLP	–	–	–	–	Not filed
Andra AP-fonden	–	–	–	–	Not filed
Artisan Partners Limited Partnership	–	–	–	–	Not filed
Amalgamated Bank	–	–	–	–	Not filed
Wealth Enhancement Advisory Services, LLC	–	–	–	–	Not filed
Allworth Financial LP	–	–	–	–	Not filed
Ritholtz Wealth Management	–	–	–	–	Not filed
Walleye Capital LLC	–	–	–	–	Not filed
Ariose Capital Management Ltd	–	–	–	–	Not filed
Oregon Public Employees Retirement Fund	–	–	–	–	Not filed
Parkwood LLC	–	–	–	–	Not filed
Calamos Advisors LLC	–	–	–	–	Not filed
Gateway Investment Advisers LLC	–	–	–	–	Not filed
M&T Bank Corp	–	–	–	–	Not filed
Lifeworks Advisors, LLC	–	–	–	–	Not filed
Chapin Davis, Inc.	–	–	–	–	Not filed
Empowered Funds, LLC	–	–	–	–	Not filed
Louisiana State Employees Retirement System	–	–	–	–	Not filed
Fifth Third Bancorp	–	–	–	–	Not filed
Xponance, Inc.	–	–	–	–	Not filed
CI Private Wealth, LLC	–	–	–	–	Not filed
Portman Square Capital LLP	–	–	–	–	Not filed
Maplelane Capital, LLC	–	–	–	–	Not filed
Rheos Capital Works Inc.	–	–	–	–	Not filed
Shelton Capital Management	–	–	–	–	Not filed
Picton Mahoney Asset Management	–	–	–	–	Not filed
Federation des caisses Desjardins du Quebec	–	–	–	–	Not filed
Eventide Asset Management, LLC	–	–	–	–	Not filed
Teachers Retirement System of the State of Kentucky	–	–	–	–	Not filed
Allstate Corp	–	–	–	–	Not filed
Temasek Holdings (Private) Ltd	–	–	–	–	Not filed
Windward Capital Management Co	–	–	–	–	Not filed
Utah Retirement Systems	–	–	–	–	Not filed
Zevenbergen Capital Investments LLC	–	–	–	–	Not filed
Aquatic Capital Management LLC	–	–	–	–	Not filed
CAPROCK Group, Inc.	–	–	–	–	Not filed
Prospera Financial Services Inc	–	–	–	–	Not filed
State of Alaska, Department of Revenue	–	–	–	–	Not filed
Taikang Asset Management (Hong Kong) Co Ltd	–	–	–	–	Not filed
Abn Amro Investment Solutions	–	–	–	–	Not filed
Norinchukin Bank, The	–	–	–	–	Not filed
QRG Capital Management, Inc.	–	–	–	–	Not filed
Prime Capital Investment Advisors, LLC	–	–	–	–	Not filed
Mutual of America Capital Management LLC	–	–	–	–	Not filed
Tortoise Capital Advisors, L.L.C.	–	–	–	–	Not filed
Cornerstone Advisors, LLC	–	–	–	–	Not filed
Yousif Capital Management, LLC	–	–	–	–	Not filed
PDT Partners, LLC	–	–	–	–	Not filed
PEAK6 LLC	–	–	–	–	Not filed
Brinker Capital Investments, LLC	–	–	–	–	Not filed
Illinois Municipal Retirement Fund	–	–	–	–	Not filed
Berkshire Capital Holdings Inc	–	–	–	–	Not filed
Ethic Inc.	–	–	–	–	Not filed
Aragon Global Management, LP	–	–	–	–	Not filed
Untitled Investments LP	–	–	–	–	Not filed
Profund Advisors LLC	–	–	–	–	Not filed
Kestra Private Wealth Services, LLC	–	–	–	–	Not filed
Icon Advisers Inc	–	–	–	–	Not filed
CVFG LLC	–	–	–	–	Not filed
VMS Asset Management Limited	–	–	–	–	Not filed
Zweig-DiMenna Associates LLC	–	–	–	–	Not filed
Bell Bank	–	–	–	–	Not filed
BTC Capital Management, Inc.	–	–	–	–	Not filed
Night Squared LP	–	–	–	–	Not filed
Mizuho Securities USA LLC	–	–	–	–	Not filed
Gulf International Bank (UK) Ltd	–	–	–	–	Not filed
Brookstone Capital Management	–	–	–	–	Not filed
SeaBridge Investment Advisors LLC	–	–	–	–	Not filed
Hidden Lake Asset Management LP	–	–	–	–	Not filed
XTX Topco Ltd	–	–	–	–	Not filed
Lombard Odier Asset Management (Switzerland) SA	–	–	–	–	Not filed
Aware Super Pty Ltd as trustee of Aware Super	–	–	–	–	Not filed
Elo Mutual Pension Insurance Co	–	–	–	–	Not filed
Engineers Gate Manager LP	–	–	–	–	Not filed
Marex Group plc	–	–	–	–	Not filed
Peapack Gladstone Financial Corp	–	–	–	–	Not filed
Thrivent Financial for Lutherans	–	–	–	–	Not filed
Atlantic Trust, LLC	–	–	–	–	Not filed
Steward Partners Investment Advisory, LLC	–	–	–	–	Not filed
SummitTX Capital, L.P.	–	–	–	–	Not filed