Quest Diagnostics Incorporated (DGX) ownership: Top institutional holder: VANGUARD GROUP INC ($2.50B). Insider activity: Net Seller (0 buys, 20 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 14392082.00 | $2.50B | 2025-12-31 |
| BlackRock, Inc. | 9172292.00 | $1.80B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 7145672.00 | $1.40B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6081400.00 | $1.19B | 2026-03-31 |
| STATE STREET CORP | 5380821.00 | $1.05B | 2026-03-31 |
| Boston Partners | 4012232.00 | $786.65M | 2026-03-31 |
| JPMORGAN CHASE & CO | 3846456.00 | $758.37M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 3086308.00 | $602.66M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-20 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.