STX Seagate Technology Holdings plc: institutional ownership and insider trading
2,056 funds reported holding $211B of Seagate Technology Holdings plc in their latest 13F filings; in Q2 2026 funds net bought $6.55B, with 558 new positions and 67 funds selling out; over the last 12 months insiders bought $0 and sold $594M on the open market.
Famous investors holding STX
- Stephen Mandel (Lone Pine Capital): $965M, 5.9% of the portfolio
- Stanley Druckenmiller (Duquesne Family Office): $118M, 2.3% of the portfolio
- Chase Coleman (Tiger Global Management): $275M, 1.2% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $1.80B, 0.9% of the portfolio
- Ray Dalio (Bridgewater Associates): $193M, 0.8% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $441M, 0.6% of the portfolio
- Ken Griffin (Citadel Advisors): $4.99B, 0.6% of the portfolio
- Izzy Englander (Millennium Management): $1.05B, 0.4% of the portfolio
- Two Sigma (Two Sigma Investments): $364M, 0.3% of the portfolio
- Dan Sundheim (D1 Capital Partners): $29.1M, 0.1% of the portfolio
Largest institutional holders of STX
- BlackRock, Inc. (BLK) — $14.6B
- VANGUARD CAPITAL MANAGEMENT LLC — $14.1B
- STATE STREET CORP (STT, STT-PG) — $9.57B
- FMR LLC — $7.87B
- VANGUARD GROUP INC — $7.74B
- VANGUARD PORTFOLIO MANAGEMENT LLC — $7.72B
- JANE STREET GROUP, LLC — $7.61B
- Invesco Ltd. (IVZ) — $7.28B
- SUSQUEHANNA INTERNATIONAL GROUP, LLP — $5.70B
- WCM INVESTMENT MANAGEMENT, LLC — $5.15B
Recent STX insider trades
- Oct 1, 2026: Mosley William D sold 18,998 shares ($17.4M)
- Oct 1, 2026: Mosley William D sold 11,002 shares ($10.3M)
- Sep 21, 2026: Morris John Christopher sold 9,354 shares ($8.21M)
- Sep 15, 2026: Morris John Christopher sold 15,466 shares ($11.9M)
Members of Congress trading STX
- Sep 30, 2026: Lisa C. McClain sold part of $15.0K–$50.0K
- Sep 15, 2026: Kevin Hern sold part of $1.00K–$15.0K
- Dec 18, 2025: Julie Johnson sold $1.00K–$15.0K
- Nov 13, 2025: Julie Johnson sold part of $1.00K–$15.0K
- Oct 28, 2025: Kevin Hern sold part of $15.0K–$50.0K
- Oct 6, 2025: Kevin Hern sold part of $15.0K–$50.0K
- Sep 8, 2025: Lisa C. McClain bought $15.0K–$50.0K
- Aug 14, 2025: Julie Johnson sold part of $1.00K–$15.0K
- Jul 29, 2025: Julie Johnson sold part of $1.00K–$15.0K
- Apr 8, 2025: Robert P. Bresnahan, Jr. sold $1.00K–$15.0K
5%+ owners
- Vanguard Capital Management: 7.5% (Schedule 13G, filed Apr 30, 2026)