Over the 90-day window ending December 12, 2025, Quest Diagnostics's three dominant insider ownership positions are held by CEO And President J. E. Davis (120.48K shares), Director Gary M Pfeiffer (29.43K shares), Executive Vice President & Cfo Sam Samad (25.74K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Stephen H Rusckowski | 389,597 | 08 Mar, 2023 | |
| J. E. Davis | CEO And President | 120,480 | 28 Nov, 2025 |
| Mark Guinan | Executive Vice President & Cfo | 98,981 | 09 Mar, 2022 |
| Catherine T. Doherty | EVP And Regional Businesses | 68,068 | 07 Mar, 2025 |
| Manner Carrie Eglinton | SVP And Advanced Diagnostics | 48,391 | 09 Mar, 2022 |
| Michael E Prevoznik | SVP & General Counsel | 38,117 | 30 Sep, 2025 |
| Michael J Deppe | SVP And Corp. Controller & Cao | 34,365 | 05 Mar, 2025 |
| Timothy M Ring | 29,507 | 19 May, 2025 | |
| Gary M Pfeiffer | 29,431 | 24 Oct, 2025 | |
| Manuel O. Mendez | SVP & Chief Commercial Officer | 29,045 | 22 Feb, 2021 |
| Timothy L Main | 26,297 | 19 May, 2025 | |
| Sam Samad | Executive Vice President & Cfo | 25,741 | 24 Oct, 2025 |
| Gail R Wilensky | 20,506 | 19 May, 2023 | |
| Vicky B Gregg | 17,037 | 28 Nov, 2025 | |
| Patrick Plewman | SVP For Diagnostic Services | 15,333 | 24 Oct, 2025 |
| Denise M Morrison | 10,742 | 19 May, 2025 | |
| Wright Iii Lassiter | 9,044 | 25 Jul, 2025 | |
| Karthik Kuppusamy | SVP And Clinical Solutions | 8,737 | 24 Oct, 2025 |
| Mark E Delaney | SVP & Chief Commercial Officer | 7,530 | 20 Nov, 2025 |
| Tracey Doi | 6,490 | 19 May, 2025 | |
| Helen Torley | 6,260 | 25 May, 2021 | |
| Mark A Gardner | SVP Of Molecular Gen & Oncol | 4,673 | 26 Sep, 2024 |
| Luis Diaz | 4,054 | 19 May, 2025 | |
| Robert B Carter | 2,698 | 24 Oct, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 25 Nov, 2025 | J. E. Davis | Common Stock | A | 55,093 | $95.80 | 175,573 | D | M |
| 25 Nov, 2025 | Vicky B Gregg | Common Stock | D | 1,250 | $191.76 | 17,037 | D | S |
| 25 Nov, 2025 | J. E. Davis | Common Stock | D | 9,342 | $191.59 | 166,231 | D | S |
| 25 Nov, 2025 | J. E. Davis | Common Stock | D | 41,004 | $192.27 | 125,227 | D | S |
| 25 Nov, 2025 | J. E. Davis | Common Stock | D | 4,747 | $192.97 | 120,480 | D | S |
| 18 Nov, 2025 | Mark E Delaney | Common Stock | A | 7,846 | $144.47 | 15,376 | D | M |
| 18 Nov, 2025 | Mark E Delaney | Common Stock | A | 100 | $143.33 | 15,476 | D | M |
| 18 Nov, 2025 | Mark E Delaney | Common Stock | D | 7,946 | $187.35 | 7,530 | D | S |
| 05 Nov, 2025 | J. E. Davis | Common Stock | D | 7,143 | $175.57 | 120,480 | D | F |
| 22 Oct, 2025 | Gary M Pfeiffer | Common Stock | D | 1,482 | $182.40 | 29,431 | D | S |
| 21 Oct, 2025 | Patrick Plewman | Common Stock | A | 46 | $189.08 | 15,333 | D | A |
| 21 Oct, 2025 | Karthik Kuppusamy | Common Stock | A | 15 | $189.08 | 8,379 | D | A |
| 21 Oct, 2025 | Robert B Carter | Common Stock | A | 6 | $189.09 | 2,698 | D | A |
| 21 Oct, 2025 | Vicky B Gregg | Common Stock | A | 70 | $189.08 | 18,287 | D | A |
| 21 Oct, 2025 | Sam Samad | Common Stock | A | 68 | $189.08 | 25,741 | D | A |
| 21 Oct, 2025 | Mark E Delaney | Common Stock | A | 15 | $189.08 | 7,530 | D | A |
| 26 Sep, 2025 | Michael E Prevoznik | Common Stock | A | 227 | $103.57 | 38,344 | D | M |
| 26 Sep, 2025 | Michael E Prevoznik | Common Stock | D | 83 | $187.22 | 38,261 | D | S |
| 26 Sep, 2025 | Michael E Prevoznik | Common Stock | D | 144 | $188.66 | 38,117 | D | S |
| 23 Sep, 2025 | Michael E Prevoznik | Common Stock | A | 28,288 | $103.57 | 66,405 | D | M |