Who owns STX? 13F holders and whale ownership
STX is tracked across public portfolios in Whale Analyzer. This page answers who owns STX, which top funds are buying STX, aggregate disclosed value, and recent position changes based on public data. Capital Group is the largest reported holder at $4.18B; the top five funds control 95.7% of reported ownership; institutions were net buying last quarter (7 increased, 2 reduced); the stock trades above the aggregate whale cost basis of $433.65. Top tracked holders include Capital Group, Stephen Mandel, NPS Korea, and Chase Coleman.
Continue to the live STX dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Capital Group 13F portfolio Capital Research Global Investors holdings | $4.18B | 4.3M | Reduced |
| Stephen Mandel 13F portfolio Lone Pine Capital holdings | $965.1M | 1.0M | New |
| NPS Korea 13F portfolio National Pension Service holdings | $805.5M | 834.7K | Increased |
| Chase Coleman 13F portfolio Tiger Global Management holdings | $275.1M | 285.1K | New |
| Ray Dalio 13F portfolio Bridgewater Associates holdings | $192.8M | 199.8K | Reduced |
| Whale Rock Capital 13F portfolio Whale Rock Capital Management holdings | $143.3M | 148.5K | New |
| Stanley Druckenmiller 13F portfolio Duquesne Family Office holdings | $117.7M | 122.0K | Increased |
| Dan Sundheim 13F portfolio D1 Capital Partners holdings | $29.1M | 30.1K | New |
| Lee Ainslie 13F portfolio Maverick Capital holdings | $1.2M | 1.2K | New |
Ownership concentration
Reported ownership of STX is highly concentrated across tracked institutions.
- Single largest holder: 62.3% of reported ownership
- Top 5 holders: 95.7%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 9 tracked institutions, 7 increased, 2 reduced. Net positioning is net buying.
- Capital Group — Capital Research Global Investors ($4.18B) (▼ 24.6% qoq shares)
- Stephen Mandel — Lone Pine Capital ($965.1M) · avg cost $579.03
- NPS Korea — National Pension Service ($805.5M) (▲ 0.8% qoq shares) · avg cost $178.69
- Chase Coleman — Tiger Global Management ($275.1M) · avg cost $579.03
- Ray Dalio — Bridgewater Associates ($192.8M) (▼ 39.3% qoq shares)
- Whale Rock Capital — Whale Rock Capital Management ($143.3M) · avg cost $579.03
- Stanley Druckenmiller — Duquesne Family Office ($117.7M) (▲ 140.6% qoq shares)
- Dan Sundheim — D1 Capital Partners ($29.1M) · avg cost $579.03
Whale cost basis vs current price
The aggregate tracked cost basis is $433.65 versus a current price of $849.28, so STX trades above its cost basis (+95.8%). Average unrealized P&L across tracked holders: 108%.
Sector positioning — Information Technology
STX sits within the Information Technology sector alongside 136 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live STX dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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Learn more in Whale Analyzer Academy
Deepen your read on STX with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns STX stock?
Whale Analyzer tracks 9 public institutional holders of STX with a combined reported value of $6.71B. See the holder table above for the largest tracked positions.
Which top funds are buying STX?
Tracked institutions were net buying last quarter — 7 increased, 2 reduced. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is STX ownership?
The top five tracked holders report 95.7% of aggregate ownership.
Is STX above or below the whale cost basis?
The aggregate tracked cost basis is $433.65 versus a current price of $849.28 (+95.8%).
What does 13F ownership mean for STX?
Use the interactive STX dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.