As of April 22, 2026, Quest Diagnostics's top three insider holders are Stephen H Rusckowski (Chairman, Ceo And President, 389.60K shares), J. E. Davis (Ceo And President, 142.42K shares), Mark Guinan (Executive Vice President Cfo, 98.98K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Stephen H Rusckowski | Chairman, Ceo And President | 389,597 | 0 | 08 Mar, 2023 |
| J. E. Davis | Ceo And President | 142,423 | 0 | 06 Mar, 2026 |
| Mark Guinan | Executive Vice President Cfo | 98,981 | 0 | 09 Mar, 2022 |
| Catherine T. Doherty | Evp, Regional Businesses | 67,122 | 0 | 06 Mar, 2026 |
| Manner Carrie Eglinton | Svp, Advanced Diagnostics | 48,391 | 0 | 09 Mar, 2022 |
| Michael E Prevoznik | Svp General Counsel | 37,557 | 0 | 06 Mar, 2026 |
| Michael J Deppe | Svp, Corp. Controller Cao | 35,196 | 0 | 06 Mar, 2026 |
| Sam Samad | Executive Vice President Cfo | 33,268 | 0 | 06 Mar, 2026 |
| Timothy M Ring | - | 29,507 | 0 | 19 May, 2025 |
| Gary M Pfeiffer | - | 29,431 | 0 | 24 Oct, 2025 |
| Timothy L Main | - | 26,297 | 0 | 19 May, 2025 |
| Gail R Wilensky | - | 20,506 | 0 | 19 May, 2023 |
| Vicky B Gregg | - | 17,104 | 0 | 20 Feb, 2026 |
| Patrick Plewman | Svp For Diagnostic Services | 15,198 | 0 | 06 Mar, 2026 |
| Karthik Kuppusamy | Svp, Clinical Solutions | 13,441 | 0 | 06 Mar, 2026 |
| Mark E Delaney | Svp Chief Commercial Officer | 11,864 | 0 | 06 Mar, 2026 |
| Denise M Morrison | - | 10,742 | 0 | 19 May, 2025 |
| Wright Iii Lassiter | - | 9,057 | 0 | 20 Feb, 2026 |
| Tracey Doi | - | 6,490 | 0 | 19 May, 2025 |
| Mark A Gardner | Svp Of Molecular Gen Oncol | 4,673 | 0 | 26 Sep, 2024 |
| Luis Diaz | - | 4,054 | 0 | 19 May, 2025 |
| Robert B Carter | - | 2,704 | 0 | 20 Feb, 2026 |
| Timothy C Wentworth | - | 215 | 0 | 11 Mar, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Apr, 2026 | Timothy C Wentworth | Phantom Stock Units | A | 198 | $0.00 | 198 | D | A |
| 09 Mar, 2026 | Timothy C Wentworth | Common Stock | A | 215 | $0.00 | 215 | D | A |
| 04 Mar, 2026 | Catherine T. Doherty | Common Stock | A | 11,364 | $204.86 | 78,486 | D | A |
| 04 Mar, 2026 | J. E. Davis | Common Stock | A | 51,652 | $204.86 | 168,837 | D | A |
| 04 Mar, 2026 | Karthik Kuppusamy | Common Stock | A | 6,200 | $204.86 | 16,069 | D | A |
| 04 Mar, 2026 | Patrick Plewman | Common Stock | A | 5,682 | $204.86 | 20,880 | D | A |
| 04 Mar, 2026 | Michael J Deppe | Common Stock | A | 1,473 | $204.86 | 35,946 | D | A |
| 04 Mar, 2026 | Mark E Delaney | Common Stock | A | 5,682 | $204.86 | 14,190 | D | A |
| 04 Mar, 2026 | Sam Samad | Common Stock | A | 13,947 | $204.86 | 40,988 | D | A |
| 04 Mar, 2026 | Michael E Prevoznik | Common Stock | A | 7,232 | $204.86 | 44,789 | D | A |
| 04 Mar, 2026 | Michael E Prevoznik | Common Stock | D | 3,354 | $204.86 | 41,435 | D | F |
| 04 Mar, 2026 | J. E. Davis | Common Stock | D | 26,414 | $204.86 | 142,423 | D | F |
| 04 Mar, 2026 | Mark E Delaney | Common Stock | D | 2,326 | $204.86 | 11,864 | D | F |
| 04 Mar, 2026 | Catherine T. Doherty | Common Stock | D | 5,806 | $204.86 | 72,680 | D | F |
| 04 Mar, 2026 | Michael J Deppe | Common Stock | D | 750 | $204.86 | 35,196 | D | F |
| 04 Mar, 2026 | Sam Samad | Common Stock | D | 7,720 | $204.86 | 33,268 | D | F |
| 04 Mar, 2026 | Karthik Kuppusamy | Common Stock | D | 2,628 | $204.86 | 13,441 | D | S |
| 04 Mar, 2026 | Patrick Plewman | Common Stock | D | 2,827 | $204.86 | 18,053 | D | F |
| 05 Mar, 2026 | Michael E Prevoznik | Common Stock | D | 3,878 | $206.21 | 37,557 | D | S |
| 05 Mar, 2026 | Patrick Plewman | Common Stock | D | 2,855 | $206.21 | 15,198 | D | S |