Michael E. Prevoznik is CLO & VP at QUEST DIAGNOSTICS INC (DGX). They have made 34 open-market trades across 1 company since 2006, most recently 2026-08-28.
CIK 0001222679
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 34 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DGX | 36,557 | $9.3M |
Shares reported on the most recent Form 4, priced at the 2026-08-31 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| DGX | SELL · 10b5-1 | 2026-08-28 | 2026-08-31 | $243.11 | $5.5M | -2.6% | -3.4% | — |
| DGX | SELL · 10b5-1 | 2026-03-05 | 2026-03-06 | $206.21 | $800K | -1.5% | +0.4% | -1.0% |
| DGX | SELL · 10b5-1 | 2026-03-03 | 2026-03-04 | $207.73 | $109K | -3.5% | -3.5% | -6.4% |
| DGX | SELL | 2026-02-19 | 2026-02-20 | $204.83 | $228K | +3.2% | -3.2% | -4.1% |
| DGX | SELL · 10b5-1 | 2025-09-26 | 2025-09-30 | $188.13 | $43K | -3.5% | -7.8% | -8.0% |
| DGX | SELL · 10b5-1 | 2025-09-23 | 2025-09-25 | $187.12 | $10.6M | -2.4% | -3.2% | -5.6% |
| DGX | SELL · 10b5-1 | 2025-03-17 | 2025-03-19 | $170.00 | $789K | +0.8% | -3.5% | +6.6% |
| DGX | SELL · 10b5-1 | 2025-03-04 | 2025-03-05 | $175.79 | $208K | +0.9% | -4.5% | +0.9% |
| DGX | SELL · 10b5-1 | 2025-02-27 | 2025-02-28 | $172.61 | $182K | -4.2% | -2.6% | -0.9% |
| DGX | SELL · 10b5-1 | 2025-02-20 | 2025-02-21 | $170.99 | $207K | +0.2% | -2.6% | -1.2% |
| DGX | SELL | 2024-11-29 | 2024-12-02 | $163.07 | $11.5M | -3.4% | -6.6% | +9.5% |
| DGX | SELL | 2024-08-29 | 2024-09-03 | $154.97 | $10.1M | -1.8% | -3.2% | +2.7% |
| DGX | SELL · 10b5-1 | 2024-02-29 | 2024-03-01 | $125.88 | $1.4M | +4.3% | +8.6% | +12.3% |
| DGX | SELL · 10b5-1 | 2024-02-22 | 2024-02-23 | $126.14 | $167K | +0.8% | +2.7% | +11.2% |
| DGX | SELL | 2023-03-07 | 2023-03-08 | $140.55 | $1.3M | -3.2% | +4.4% | -3.1% |
| DGX | SELL | 2023-03-02 | 2023-03-03 | $138.54 | $164K | -5.5% | +1.5% | -4.7% |
| DGX | SELL | 2023-02-24 | 2023-02-27 | $141.42 | $400K | -2.4% | +0.2% | -3.1% |
| DGX | SELL | 2022-05-17 | 2022-05-19 | $139.97 | $14.2M | -1.4% | -6.2% | -2.0% |
| DGX | SELL | 2022-03-08 | 2022-03-09 | $135.21 | $1.7M | +7.0% | +4.1% | +2.5% |
| DGX | SELL | 2022-02-28 | 2022-03-02 | $130.00 | $86K | +2.5% | +1.2% | +4.7% |
| DGX | SELL | 2022-02-24 | 2022-02-28 | $126.26 | $421K | +4.1% | +6.4% | +7.9% |
| DGX | SELL | 2021-05-05 | 2021-05-07 | $137.00 | $6.2M | -6.5% | -7.7% | +5.4% |
| DGX | SELL | 2021-03-10 | 2021-03-11 | $120.47 | $1.3M | +3.0% | +6.0% | +4.9% |
| DGX | SELL | 2021-02-25 | 2021-03-01 | $115.49 | $185K | +3.9% | +9.5% | +8.6% |
| DGX | SELL | 2021-02-24 | 2021-02-25 | $116.95 | $278K | +4.2% | +11.2% | +15.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.