Stock ownership · Live

STX

Seagate Technology · Other

Today — 2026-04-21

All movers →

Last:$543.00

Day:+1.79%

Source: Yahoo Finance EOD 2026-04-21

Tracked owners

Sum of conviction

Sector

Other

HoldLens Signal

Full buy/sell dossier for STX

Verdict · Multi-quarter trend · Activity · News · Ownership

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Smart money activity

Every tracked buy, add, trim, and exit on STX by the best portfolio managers in the world. Ranked by manager quality inside each quarter.

Smart money activity

11 buys · 5 sells across tracked 13F filings

Net signal: Heavy accumulation

Q2 2026(5 moves)

Portfolio manager	Activity	Share change	% portfolio
Stanley DruckenmillerTier 1 Duquesne Family Office	Add 141%	+71K	2.30%
Stephen MandelTier 1 Lone Pine Capital	Buy (new)	+1.00M	5.90%
Chase ColemanElite Tiger Global Management	Buy (new)	+285K	1.10%
Joel GreenblattElite Gotham Asset Management	Add 24.00%	+244K	0.40%
Tom SlaterElite Baillie Gifford (Long Term Global Growth)	Buy (new)	+40	0.00%

Q1 2026(2 moves)

Portfolio manager	Activity	Share change	% portfolio
Stanley DruckenmillerTier 1 Duquesne Family Office	Buy (new)	+51K	0.60%
Joel GreenblattElite Gotham Asset Management	Add 17.00%	+149K	0.20%

Q4 2025(2 moves)

Portfolio manager	Activity	Share change	% portfolio
Joel GreenblattElite Gotham Asset Management	Add 19.00%	+138K	0.10%
Stanley DruckenmillerTier 1 Duquesne Family Office	Sell (exit)	-86K	0.00%

Q3 2025(2 moves)

Portfolio manager	Activity	Share change	% portfolio
Joel GreenblattElite Gotham Asset Management	Add 48.00%	+231K	0.10%
Stanley DruckenmillerTier 1 Duquesne Family Office	Reduce 57.00%	-112K	0.50%

Q2 2025(2 moves)

Portfolio manager	Activity	Share change	% portfolio
Stanley DruckenmillerTier 1 Duquesne Family Office	Reduce 58.00%	-268K	0.70%
Joel GreenblattElite Gotham Asset Management	Reduce 25.00%	-157K	0.10%

Q1 2025(1 move)

Portfolio manager	Activity	Share change	% portfolio
Stanley DruckenmillerTier 1 Duquesne Family Office	Reduce 78.00%	-1.61M	1.30%

Q4 2024(2 moves)

Portfolio manager	Activity	Share change	% portfolio
Stanley DruckenmillerTier 1 Duquesne Family Office	Add 9.00%	+170K	4.80%
Joel GreenblattElite Gotham Asset Management	Add 10.00%	+63K	0.10%

Insider activity

SEC Form 4 filings — when CEOs, CFOs, and 10%+ owners buy or sell their own stock.

Insider activity (Form 4)

19 buys · 181 sells from corporate insiders

Net: INSIDER SELLING

Insider	Action	Shares	Value	Date
MOSLEY WILLIAM D CEO	sell	962	$910K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	440	$416K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	280	$264K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	40	$38K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	80	$75K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	720	$676K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	640	$601K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	579	$543K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	759	$711K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	640	$598K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	822	$768K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	840	$784K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	1,320	$1.23M	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	1,665	$1.55M	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	855	$795K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	360	$334K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	14,000	$0	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	640	$594K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	480	$445K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	1,080	$1000K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	640	$592K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	760	$702K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	800	$738K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	930	$857K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	630	$580K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	840	$772K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	920	$845K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	400	$367K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	480	$440K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	960	$878K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	904	$826K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	696	$636K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	1,146	$1.05M	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	840	$765K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	307	$279K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	1,027	$933K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	560	$508K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	601	$545K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	480	$435K	Oct 1, 2026
MOSLEY WILLIAM D CEO	sell	480	$434K	Oct 1, 2026

Showing the 40 most recent of 200 tracked Form 4 transactions. Full STX insider history →

Latest news

Recent headlines for STX.

Hedge funds holding STX

1 superinvestor hold Seagate Technology as a top position. Sorted by % of portfolio.

Manager	% Portfolio
Jeffrey Ubben Storage — multi-year hold.	6.3%

Dividend tax by country

What will you keep of every $100 in STX dividend?

Your country of residenceCompany is domiciled inGross dividend (example)

Withholding rate

Domestic (no cross-border)

Tax withheld

$0.00

You'd receive

$1000.00

Of $1000 gross

Source & treaty reference

Treaty: Domestic — no cross-border withholding

Citation: IRC §§ 1441–1446 (withholding applies to foreign persons; US residents not subject to WHT on US-source dividends)

U.S. residents receiving U.S.-source dividends: no cross-border withholding; taxed on return at qualified (0/15/20%) or ordinary rates.

Estimates for educational purposes only. Tax rules change; consult a qualified tax professional for your specific situation. Dividend-tax treatment depends on holding period, account type (taxable vs. retirement), investor type (individual vs. pension vs. mutual fund), limitation-on-benefits tests, and other factors not modeled here.

Full dividend-tax rules for United States investors →

Get alerts when they buy or sell STX

One email per 13F filing — you'll know within hours if any tracked manager moves on STX.

Go deeper on the numbers

Fair value, financials and analyst estimates on Simply Wall St →Open the interactive chart on TradingView →

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Frequently asked questions

Who owns STX?

1 tracked superinvestors hold Seagate Technology (STX) as a top position based on the latest SEC 13F filings. Largest tracked holder: Jeffrey Ubben at 6.3% of portfolio. Full ranking by % of portfolio shown in the table below.

How many hedge funds hold STX?

1 of HoldLens's tracked superinvestors hold STX according to the latest SEC 13F filings. The sum of conviction across those holders is 6% (sum of each manager's % of portfolio in STX).

Who is the biggest hedge-fund holder of STX?

Among HoldLens's tracked superinvestors, Jeffrey Ubben holds the largest STX position at 6.3% of portfolio. Storage — multi-year hold.

What sector is STX?

Seagate Technology (STX) is classified as Other. Smart-money activity, insider trades (SEC Form 4), buybacks, short interest, congressional trades, and ETF ownership for STX are all aggregated on this page.

Data sourced from SEC 13F filings. STX ownership reflects publicly disclosed long positions only. Not investment advice.

Deep dive

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