Quest Diagnostics Inc (DGX) Insider Ownership

Historic Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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