DGX QUEST DIAGNOSTICS INC: institutional ownership and insider trading
1,180 funds reported holding $25.1B of QUEST DIAGNOSTICS INC in their latest 13F filings; in Q2 2026 funds net bought $502M, with 110 new positions and 70 funds selling out; over the last 12 months insiders bought $0 and sold $37.0M on the open market.
Famous investors holding DGX
- Ken Griffin (Citadel Advisors): $58.8M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $5.18M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $1.02M, 0.0% of the portfolio
- Ray Dalio (Bridgewater Associates): $796K, 0.0% of the portfolio
Largest institutional holders of DGX
- VANGUARD GROUP INC — $2.50B
- BlackRock, Inc. (BLK) — $1.97B
- VANGUARD CAPITAL MANAGEMENT LLC — $1.53B
- VANGUARD PORTFOLIO MANAGEMENT LLC — $1.30B
- STATE STREET CORP (STT, STT-PG) — $1.17B
- PRICE T ROWE ASSOCIATES INC /MD/ — $1.15B
- Boston Partners — $1.00B
- JPMORGAN CHASE & CO (JPM, AMJB, VYLD, JPM-PC, JPM-PD, JPM-PJ, JPM-PK, JPM-PL, JPM-PM) — $749M
- GEODE CAPITAL MANAGEMENT, LLC — $663M
- MORGAN STANLEY (MS, MS-PA, MS-PE, MS-PF, MS-PI, MS-PK, MS-PL, MS-PO, MS-PP, MS-PQ) — $522M
Recent DGX insider trades
- Sep 1, 2026: Davis J. E. sold 10,000 shares ($2.43M)
- Aug 28, 2026: Prevoznik Michael E sold 22,677 shares ($5.51M)
- Jul 28, 2026: Delaney Mark E sold 1,600 shares ($376K)
- Jun 4, 2026: Kuppusamy Karthik sold 8,147 shares ($1.63M)
Members of Congress trading DGX
- Nov 3, 2025: Julie Johnson sold $1.00K–$15.0K
- Oct 30, 2025: Julie Johnson bought $1.00K–$15.0K
- Oct 30, 2025: Julie Johnson sold $1.00K–$15.0K
- Jul 24, 2025: Julia Letlow sold $1.00K–$15.0K
- Apr 28, 2025: Julia Letlow bought $1.00K–$15.0K
- Mar 10, 2025: Carol D. Miller sold $15.0K–$50.0K
- Mar 10, 2025: Carol D. Miller sold $1.00K–$15.0K
- Jan 24, 2025: Gilbert Ray Cisneros, Jr. sold part of $1.00K–$15.0K
- Apr 4, 2024: Earl Blumenauer sold $1.00K–$15.0K
5%+ owners
- Vanguard Capital Management: 7.5% (Schedule 13G, filed Apr 30, 2026)
- Vanguard Portfolio Management: 5.5% (Schedule 13G, filed Apr 29, 2026)