Quest Diagnostics DGX Insider Ownership

NYSE DGX
$244.63 -0.37 (-0.15%)
As of: Aug 27, 2026 · 3:59 PM EDT

Insider Holdings by Owner

1.05Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
—
share count not reported for this filer set
Shares Held by Insiders
651.52K
filed for Sep 2026
▼-0.38% QoQ
Shares Outstanding
—
not reported
Direct Holdings
651.52K
Indirect: 0
Net Shares Traded (QoQ)
-2.48K
net selling in Sep 2026
Insiders Holding Shares
23
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

DGX's three largest insider shareholders as of August 27, 2026 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).

Form 4 Holdings

Insiders Holding DGX

Insiders 23
Shares held 1.05Mn
Of outstanding —
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Stephen H Rusckowski Chairman, Ceo And President 389,597 0 389,597 37.1% 08 Mar, 2023
2 J. E. Davis Ceo And President 132,423 0 132,423 12.6% 02 Jun, 2026
3 Mark Guinan Executive Vice President Cfo 98,981 0 98,981 9.4% 09 Mar, 2022
4 Catherine T. Doherty Evp, Regional Businesses 67,122 0 67,122 6.4% 06 Mar, 2026
5 Manner Carrie Eglinton Svp, Advanced Diagnostics 48,391 0 48,391 4.6% 09 Mar, 2022
6 Michael E Prevoznik Svp General Counsel 37,557 0 37,557 3.6% 06 Mar, 2026
7 Michael J Deppe Svp, Corp. Controller Cao 35,196 0 35,196 3.4% 06 Mar, 2026
8 Sam Samad Executive Vice President Cfo 33,478 0 33,478 3.2% 27 Jul, 2026
9 Timothy M Ring Director 31,140 0 31,140 3.0% 21 May, 2026
10 Gary M Pfeiffer Director 31,005 0 31,005 3.0% 21 May, 2026
11 Timothy L Main Director 22,460 0 22,460 2.1% 27 Jul, 2026
12 Gail R Wilensky Director 20,506 0 20,506 2.0% 19 May, 2023
13 Vicky B Gregg Director 18,386 0 18,386 1.8% 27 Jul, 2026
14 Patrick Plewman Svp For Diagnostic Services 15,293 0 15,293 1.5% 27 Jul, 2026
15 Karthik Kuppusamy Svp, Clinical Solutions 13,557 0 13,557 1.3% 27 Jul, 2026
16 Denise M Morrison Director 11,929 0 11,929 1.1% 21 May, 2026
17 Mark E Delaney Svp Chief Commercial Officer 10,335 0 10,335 1.0% 29 Jul, 2026
18 Wright Iii Lassiter Director 10,323 0 10,323 1.0% 27 Jul, 2026
19 Tracey Doi Director 7,748 0 7,748 0.7% 21 May, 2026
20 Luis Diaz Director 5,196 0 5,196 0.5% 21 May, 2026
21 Mark A Gardner Svp Of Molecular Gen Oncol 4,673 0 4,673 0.4% 26 Sep, 2024
22 Robert B Carter Director 3,864 0 3,864 0.4% 27 Jul, 2026
23 Timothy C Wentworth Director 1,358 0 1,358 0.1% 21 May, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

4,021 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
28 Jul, 2026 Mark E Delaney Svp Chief Commercial Officer Disposed S 1,600 $235.18 $376.29K 10,335 Direct
22 Jul, 2026 Vicky B Gregg Director Acquired A 72 $206.81 $14.89K 18,386 Direct
22 Jul, 2026 Timothy L Main Director Acquired L 21 $206.81 $4.34K 22,460 Direct
22 Jul, 2026 Robert B Carter Director Acquired L 11 $206.80 $2.27K 3,864 Direct
22 Jul, 2026 Karthik Kuppusamy Svp, Clinical Solutions Acquired L 37 $206.81 $7.65K 13,557 Direct
22 Jul, 2026 Patrick Plewman Svp For Diagnostic Services Acquired L 46 $206.81 $9.51K 15,293 Direct
22 Jul, 2026 Sam Samad Executive Vice President Cfo Acquired A 102 $206.81 $21.09K 33,478 Direct
22 Jul, 2026 Wright Iii Lassiter Director Acquired L 6 $206.81 $1.24K 10,323 Direct
22 Jul, 2026 Mark E Delaney Svp Chief Commercial Officer Acquired L 34 $206.81 $7.03K 11,935 Direct
01 Jul, 2026 Timothy C Wentworth Director Acquired A 144 $0.00 $0 342 Direct
04 Jun, 2026 Karthik Kuppusamy Svp, Clinical Solutions Acquired M 3,320 $127.73 $424.05K 16,830 Direct
04 Jun, 2026 Karthik Kuppusamy Svp, Clinical Solutions Acquired M 4,827 $121.81 $587.95K 21,657 Direct
04 Jun, 2026 Karthik Kuppusamy Svp, Clinical Solutions Disposed S 8,147 $200.00 $1.63Mn 13,510 Direct
04 Jun, 2026 Karthik Kuppusamy Svp, Clinical Solutions Disposed M 3,320 $127.73 $424.05K 0 Direct
04 Jun, 2026 Karthik Kuppusamy Svp, Clinical Solutions Disposed M 4,827 $121.81 $587.95K 0 Direct
01 Jun, 2026 J. E. Davis Ceo And President Disposed S 10,000 $194.14 $1.94Mn 132,423 Direct
20 May, 2026 Denise M Morrison Director Acquired A 1,142 $0.00 $0 11,929 Direct
20 May, 2026 Robert B Carter Director Acquired A 1,142 $0.00 $0 3,853 Direct
20 May, 2026 Luis Diaz Director Acquired A 1,142 $0.00 $0 5,196 Direct
20 May, 2026 Tracey Doi Director Acquired A 1,142 $0.00 $0 7,748 Direct