Quest Diagnostics Inc (DGX) Insider Ownership

Historic Insider Ownership Trends

As of May 14, 2026, Quest Diagnostics's top three insider holders are Stephen H Rusckowski (Chairman, Ceo And President, 389.60K shares), Stephen H Rusckowski (Chairman, Ceo And President, 389.60K shares), J. E. Davis (Ceo And President, 142.42K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Stephen H Rusckowski Chairman, Ceo And President 389,597 0 08 Mar, 2023
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 33,376 0 24 Apr, 2026
Sam Samad Executive Vice President Cfo 33,268 0 06 Mar, 2026
Timothy M Ring - 29,507 0 19 May, 2025
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
Gail R Wilensky - 20,506 0 19 May, 2023
Vicky B Gregg - 17,172 0 24 Apr, 2026
Patrick Plewman Svp For Diagnostic Services 15,247 0 24 Apr, 2026
Karthik Kuppusamy Svp, Clinical Solutions 13,490 0 24 Apr, 2026
Mark E Delaney Svp Chief Commercial Officer 11,901 0 24 Apr, 2026
Denise M Morrison - 10,742 0 19 May, 2025
Wright Iii Lassiter - 9,063 0 24 Apr, 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 - 2,711 0 24 Apr, 2026
Timothy C Wentworth - 215 0 11 Mar, 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.

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
20 Apr, 2026 Wright Iii Lassiter Common Stock A 6 $194.70 9,063 D L
20 Apr, 2026 Mark E Delaney Common Stock A 37 $194.70 11,901 D L
20 Apr, 2026 Vicky B Gregg Common Stock A 68 $194.70 17,172 D A
20 Apr, 2026 Karthik Kuppusamy Common Stock A 39 $194.70 13,490 D L
20 Apr, 2026 Robert B Carter Common Stock A 7 $194.70 2,711 D L
20 Apr, 2026 Patrick Plewman Common Stock A 49 $194.70 15,247 D L
20 Apr, 2026 Patrick Plewman Common Stock A 49 $194.70 15,247 D L
20 Apr, 2026 Karthik Kuppusamy Common Stock A 39 $194.70 13,490 D L
20 Apr, 2026 Mark E Delaney Common Stock A 37 $194.70 11,901 D L
20 Apr, 2026 Wright Iii Lassiter Common Stock A 6 $194.70 9,063 D L
20 Apr, 2026 Robert B Carter Common Stock A 7 $194.70 2,711 D L
20 Apr, 2026 Sam Samad Common Stock A 108 $194.70 33,376 D A
20 Apr, 2026 Robert B Carter Common Stock A 7 $194.70 2,711 D L
20 Apr, 2026 Sam Samad Common Stock A 108 $194.70 33,376 D A
20 Apr, 2026 Sam Samad Common Stock A 108 $194.70 33,376 D A
20 Apr, 2026 Vicky B Gregg Common Stock A 68 $194.70 17,172 D A
20 Apr, 2026 Wright Iii Lassiter Common Stock A 6 $194.70 9,063 D L
20 Apr, 2026 Mark E Delaney Common Stock A 37 $194.70 11,901 D L
20 Apr, 2026 Patrick Plewman Common Stock A 49 $194.70 15,247 D L
20 Apr, 2026 Karthik Kuppusamy Common Stock A 39 $194.70 13,490 D L