Quick Takeaways
- DGX - QUEST DIAGNOSTICS INC has 24 insiders with reported activity on this page.
- Net insider value flow over the last year: -$35,332,792.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 24 Insiders of QUEST DIAGNOSTICS INC
- Symbol
- DGX on NYSE
- Location
- Secaucus, NJ
What Changed
- Buy value: ; sell value: $35,332,791.
- Net share flow: -182,521.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$35,332,792.
Buys
$0
Shares: 0
Insiders: 0
Sells
$35,332,792
Shares: 182,521
Insiders: 8
Net
-$35,332,792
Shares: -182,521
Insiders: -8
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 61,816 | $0 | $12,789,997 | -$12,789,997 |
| 3-6 | 0 | 64,289 | $0 | $12,318,143 | -$12,318,143 |
| 6-9 | 0 | 54,668 | $0 | $9,917,851 | -$9,917,851 |
| 9-12 | 0 | 1,748 | $0 | $306,800 | -$306,800 |
QUEST DIAGNOSTICS INC executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Stephen H. Rusckowski | Director | $47,867,056 | Mixed | 06 Mar 2023 | ||
| J. E. Davis | CEO and President, Director | $27,238,398 | -$12,714,960 | -32% | Mixed | 04 Mar 2026 |
| Catherine T. Doherty | EVP, Regional Businesses | $14,702,234 | -$6,964,737 | -32% | Mixed | 04 Mar 2026 |
| Mark Guinan | Executive Vice President & CFO | $13,108,142 | Mixed | 07 Mar 2022 | ||
| Michael E. Prevoznik | SVP & General Counsel | $8,841,829 | -$6,505,262 | -42% | Mixed | 04 Mar 2026 |
| Timothy M. Ring | Director | $7,948,934 | Mixed | 01 Oct 2025 | ||
| Sam Samad | Executive Vice President & CFO | $7,870,127 | Mixed | 04 Mar 2026 | ||
| Manner Carrie Eglinton | SVP, Advanced Diagnostics | $7,592,213 | Mixed | 07 Mar 2022 | ||
| Michael J. Deppe | SVP, Corp. Controller & CAO | $6,881,798 | Mixed | 04 Mar 2026 | ||
| Gary M. Pfeiffer | Director | $5,368,214 | -$270,317 | -4.8% | Filing P/S | 22 Oct 2025 |
| Timothy L. Main | Director | $4,646,153 | Mixed | 15 May 2025 | ||
| Gail R. Wilensky | Director | $4,162,722 | Mixed | 17 May 2023 | ||
| Mark E. Delaney | SVP & Chief Commercial Officer | $3,341,671 | -$1,795,483 | -35% | Mixed | 04 Mar 2026 |
| Karthik Kuppusamy | SVP, Clinical Solutions | $3,139,082 | -$2,298,303 | -42% | Mixed | 04 Mar 2026 |
| Vicky B. Gregg | Director | $3,138,806 | -$239,700 | -7.1% | Mixed | 28 Jan 2026 |
| Patrick Plewman | SVP for Diagnostic Services | $3,133,979 | -$4,544,030 | -59% | Filing P/S | 04 Mar 2026 |
| Denise M. Morrison | Director | $1,897,896 | Mixed | 15 May 2025 | ||
| Wright Lassiter III | Director | $1,722,051 | Mixed | 28 Jan 2026 | ||
| Mark A. Gardner | SVP of Molecular Gen & Oncol | $1,539,829 | Mixed | 24 Sep 2024 | ||
| Tracey Doi | Director | $1,146,653 | Mixed | 15 May 2025 | ||
| Helen Torley | Director | $769,122 | Mixed | 25 May 2021 | ||
| Luis Diaz | Director | $716,260 | Mixed | 15 May 2025 | ||
| Robert B. Carter | Director | $496,211 | Mixed | 28 Jan 2026 | ||
| Timothy C. Wentworth | Director | $41,118 | Mixed | 01 Apr 2026 |
Top shareholders of QUEST DIAGNOSTICS INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC |
13F
|
Company |
13%
|
14,392,082
|
$2,497,458,052 | — | 31 Dec 2025 | |
| BlackRock, Inc. |
13D/G
13F
|
Company |
8.4%
|
9,308,815
|
$1,644,681,434 | $0 | 31 Mar 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
|
T. Rowe Price Associates, Inc. · Company |
6.5%
|
7,209,622
|
$1,275,526,324 | +$214,831,656 | 30 Jun 2025 | |
| STATE STREET CORP |
13F
|
Company |
4.9%
|
5,382,547
|
$934,033,381 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
3.7%
|
4,145,896
|
$719,437,502 | — | 31 Dec 2025 | |
| Boston Partners |
13F
|
Company |
3.5%
|
3,913,326
|
$680,020,198 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.7%
|
3,028,207
|
$523,515,466 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
2.4%
|
2,693,568
|
$467,415,402 | — | 31 Dec 2025 | |
| VICTORY CAPITAL MANAGEMENT INC |
13F
|
Company |
1.9%
|
2,126,422
|
$368,998,036 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
1.7%
|
1,931,548
|
$335,203,671 | — | 31 Dec 2025 | |
| Grantham, Mayo, Van Otterloo & Co. LLC |
13F
|
Company |
1.6%
|
1,816,060
|
$315,141,159 | — | 31 Dec 2025 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
1.6%
|
1,769,093
|
$306,990,631 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
1.5%
|
1,708,925
|
$296,549,835 | — | 31 Dec 2025 | |
| Invesco Ltd. |
13F
|
Company |
1.5%
|
1,666,979
|
$289,270,867 | — | 31 Dec 2025 | |
| EdgePoint Investment Group Inc. |
13F
|
Company |
1.5%
|
1,661,072
|
$288,245,824 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
1.5%
|
1,622,938
|
$281,628,383 | — | 31 Dec 2025 | |
| DAVIS SELECTED ADVISERS |
13F
|
Company |
1.4%
|
1,589,883
|
$275,895,498 | — | 31 Dec 2025 | |
| NORGES BANK |
13F
|
Company |
1.2%
|
1,322,663
|
$229,521,710 | — | 31 Dec 2025 | |
| FMR LLC |
13F
|
Company |
1.1%
|
1,202,254
|
$208,627,187 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
1%
|
1,114,451
|
$193,390,683 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.97%
|
1,078,573
|
$187,164,772 | — | 31 Dec 2025 | |
| FIDUCIARY MANAGEMENT INC /WI/ |
13F
|
Company |
0.94%
|
1,046,921
|
$181,672,201 | — | 31 Dec 2025 | |
| M&G Plc |
13F
|
Company |
0.85%
|
945,052
|
$164,439,048 | — | 31 Dec 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
0.78%
|
870,500
|
$151,058,412 | — | 31 Dec 2025 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC |
13F
|
Company |
0.76%
|
846,935
|
$146,968,630 | — | 31 Dec 2025 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.73%
|
813,454
|
$141,158,650 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.68%
|
751,054
|
$130,330,401 | — | 31 Dec 2025 | |
| Legal & General Group Plc |
13F
|
Company |
0.67%
|
742,974
|
$128,928,276 | — | 31 Dec 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
0.66%
|
733,456
|
$127,276,620 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.6%
|
670,741
|
$116,393,663 | — | 31 Dec 2025 | |
| Deutsche Girozentrale DekaBank |
13F
|
Individual |
0.67%
|
748,680
|
$114,346,000 | — | 31 Dec 2025 | |
| ALLIANCEBERNSTEIN L.P. |
13F
|
Company |
0.57%
|
632,407
|
$109,741,587 | — | 31 Dec 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.55%
|
609,081
|
$105,693,826 | — | 31 Dec 2025 | |
| Squarepoint Ops LLC |
13F
|
Company |
0.51%
|
565,800
|
$98,183,274 | — | 31 Dec 2025 | |
| PRINCIPAL FINANCIAL GROUP INC |
13F
|
Company |
0.48%
|
531,286
|
$92,196,063 | — | 31 Dec 2025 | |
| CRAWFORD INVESTMENT COUNSEL INC |
13F
|
Company |
0.45%
|
496,499
|
$86,157,518 | — | 31 Dec 2025 | |
| Amundi |
13F
|
Individual |
0.42%
|
464,164
|
$80,546,379 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.42%
|
463,282
|
$80,393,391 | — | 31 Dec 2025 | |
| Artemis Investment Management LLP |
13F
|
Company |
0.42%
|
460,725
|
$79,949,609 | — | 31 Dec 2025 | |
| Pacer Advisors, Inc. |
13F
|
Company |
0.4%
|
447,727
|
$77,694,066 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.38%
|
425,236
|
$73,791,203 | — | 31 Dec 2025 | |
| FIRST TRUST ADVISORS LP |
13F
|
Company |
0.32%
|
351,709
|
$61,032,070 | — | 31 Dec 2025 | |
| CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM |
13F
|
Company |
0.32%
|
350,249
|
$60,778,709 | — | 31 Dec 2025 | |
| Woodline Partners LP |
13F
|
Company |
0.31%
|
341,372
|
$59,238,283 | — | 31 Dec 2025 | |
| Nuveen, LLC |
13F
|
Company |
0.3%
|
334,034
|
$57,964,919 | — | 31 Dec 2025 | |
| ENVESTNET ASSET MANAGEMENT INC |
13F
|
Company |
0.3%
|
333,803
|
$57,924,926 | — | 31 Dec 2025 | |
| BARCLAYS PLC |
13F
|
Company |
0.3%
|
333,302
|
$57,837,898 | — | 31 Dec 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
0.3%
|
328,734
|
$57,045,211 | — | 31 Dec 2025 | |
| CANADA LIFE ASSURANCE Co |
13F
|
Company |
0.29%
|
319,293
|
$55,428,000 | — | 31 Dec 2025 | |
| Advisors Capital Management, LLC |
13F
|
Company |
0.28%
|
313,838
|
$54,460,311 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for QUEST DIAGNOSTICS INC
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Timothy C. Wentworth | DGX | Phantom Stock Units | Award | 198 | 198 | 01 Apr 2026 | Direct | |||
| Timothy C. Wentworth | DGX | Common Stock | Award | 215 | 215 | 09 Mar 2026 | Direct | |||
| Catherine T. Doherty | DGX | Common Stock | Sale | -7.65% | $1,146,115 | $206.21 | -5,558 | 67,122 | 05 Mar 2026 | Direct |
| Michael E. Prevoznik | DGX | Common Stock | Sale | -9.36% | $799,682 | $206.21 | -3,878 | 37,557 | 05 Mar 2026 | Direct |
| Patrick Plewman | DGX | Common Stock | Sale | -15.8% | $588,730 | $206.21 | -2,855 | 15,198 | 05 Mar 2026 | Direct |
| Sam Samad | DGX | Common Stock | Tax liability | -18.8% | -7,720 | 33,268 | 04 Mar 2026 | Direct | ||
| Sam Samad | DGX | Common Stock | Award | 51.6% | 13,947 | 40,988 | 04 Mar 2026 | Direct | ||
| Catherine T. Doherty | DGX | Common Stock | Tax liability | -7.4% | -5,806 | 72,680 | 04 Mar 2026 | Direct | ||
| Catherine T. Doherty | DGX | Common Stock | Award | 16.9% | 11,364 | 78,486 | 04 Mar 2026 | Direct | ||
| Mark E. Delaney | DGX | Common Stock | Tax liability | -16.4% | -2,326 | 11,864 | 04 Mar 2026 | Direct | ||
| Mark E. Delaney | DGX | Common Stock | Award | 66.8% | 5,682 | 14,190 | 04 Mar 2026 | Direct | ||
| Michael E. Prevoznik | DGX | Common Stock | Tax liability | -7.49% | -3,354 | 41,435 | 04 Mar 2026 | Direct | ||
| Michael E. Prevoznik | DGX | Common Stock | Award | 19.3% | 7,232 | 44,789 | 04 Mar 2026 | Direct | ||
| J. E. Davis | DGX | Common Stock | Tax liability | -15.6% | -26,414 | 142,423 | 04 Mar 2026 | Direct | ||
| J. E. Davis | DGX | Common Stock | Award | 44.1% | 51,652 | 168,837 | 04 Mar 2026 | Direct | ||
| Patrick Plewman | DGX | Common Stock | Tax liability | -13.5% | -2,827 | 18,053 | 04 Mar 2026 | Direct | ||
| Patrick Plewman | DGX | Common Stock | Award | 37.4% | 5,682 | 20,880 | 04 Mar 2026 | Direct | ||
| Michael J. Deppe | DGX | Common Stock | Tax liability | -2.09% | -750 | 35,196 | 04 Mar 2026 | Direct | ||
| Michael J. Deppe | DGX | Common Stock | Award | 4.27% | 1,473 | 35,946 | 04 Mar 2026 | Direct | ||
| Karthik Kuppusamy | DGX | Common Stock | Sale | -16.4% | $538,372 | $204.86 | -2,628 | 13,441 | 04 Mar 2026 | Direct |
| Karthik Kuppusamy | DGX | Common Stock | Award | 62.8% | 6,200 | 16,069 | 04 Mar 2026 | Direct | ||
| Catherine T. Doherty | DGX | Common Stock | Sale | -0.93% | $131,285 | $207.73 | -632 | 67,122 | 03 Mar 2026 | Direct |
| Michael E. Prevoznik | DGX | Common Stock | Sale | -1.38% | $109,266 | $207.73 | -526 | 37,557 | 03 Mar 2026 | Direct |
| Patrick Plewman | DGX | Common Stock | Sale | -2.63% | $85,169 | $207.73 | -410 | 15,198 | 03 Mar 2026 | Direct |
| Catherine T. Doherty | DGX | Common Stock | Tax liability | -0.95% | -648 | 67,754 | 02 Mar 2026 | Direct | ||
| Sam Samad | DGX | Common Stock | Tax liability | -3.11% | -869 | 27,041 | 02 Mar 2026 | Direct | ||
| Michael E. Prevoznik | DGX | Common Stock | Tax liability | -0.75% | -288 | 38,083 | 02 Mar 2026 | Direct | ||
| J. E. Davis | DGX | Common Stock | Sale | -7.86% | $2,125,200 | $212.52 | -10,000 | 117,185 | 02 Mar 2026 | Direct |
| J. E. Davis | DGX | Common Stock | Tax liability | -2.28% | -2,968 | 127,185 | 02 Mar 2026 | Direct | ||
| Patrick Plewman | DGX | Common Stock | Tax liability | -1.45% | -230 | 15,608 | 02 Mar 2026 | Direct | ||
| Karthik Kuppusamy | DGX | Common Stock | Tax liability | -2.03% | -205 | 9,869 | 02 Mar 2026 | Direct | ||
| Mark E. Delaney | DGX | Common Stock | Tax liability | -2.16% | -188 | 8,508 | 02 Mar 2026 | Direct | ||
| Michael J. Deppe | DGX | Common Stock | Tax liability | -0.25% | -88 | 34,473 | 02 Mar 2026 | Direct | ||
| Patrick Plewman | DGX | Common Stock | Sale | -5.7% | $196,227 | $204.83 | -958 | 15,838 | 19 Feb 2026 | Direct |
| Michael E. Prevoznik | DGX | Common Stock | Sale | -2.81% | $227,566 | $204.83 | -1,111 | 38,371 | 19 Feb 2026 | Direct |
| Catherine T. Doherty | DGX | Common Stock | Sale | -2.05% | $293,521 | $204.83 | -1,433 | 68,402 | 19 Feb 2026 | Direct |
| Patrick Plewman | DGX | Common Stock | Tax liability | -3.1% | -537 | 16,796 | 18 Feb 2026 | Direct | ||
| Patrick Plewman | DGX | Common Stock | Award | 12.7% | 1,952 | 17,333 | 18 Feb 2026 | Direct | ||
| Patrick Plewman | DGX | Non-Qualifed Stock Option (right to buy) | Award | 9,009 | 9,009 | 18 Feb 2026 | Direct | |||
| Sam Samad | DGX | Common Stock | Tax liability | -6.28% | -1,865 | 27,841 | 18 Feb 2026 | Direct | ||
| Sam Samad | DGX | Common Stock | Award | 15.4% | 3,965 | 29,706 | 18 Feb 2026 | Direct | ||
| Sam Samad | DGX | Non-Qualifed Stock Option (right to buy) | Award | 18,303 | 18,303 | 18 Feb 2026 | Direct | |||
| Michael E. Prevoznik | DGX | Common Stock | Tax liability | -1.61% | -648 | 39,482 | 18 Feb 2026 | Direct | ||
| Michael E. Prevoznik | DGX | Common Stock | Award | 5.28% | 2,013 | 40,130 | 18 Feb 2026 | Direct | ||
| Michael E. Prevoznik | DGX | Non-Qualifed Stock Option (right to buy) | Award | 9,289 | 9,289 | 18 Feb 2026 | Direct | |||
| J. E. Davis | DGX | Common Stock | Tax liability | -4.54% | -6,184 | 130,153 | 18 Feb 2026 | Direct | ||
| J. E. Davis | DGX | Common Stock | Award | 13.2% | 15,857 | 136,337 | 18 Feb 2026 | Direct | ||
| J. E. Davis | DGX | Non-Qualifed Stock Option (right to buy) | Award | 73,225 | 73,225 | 18 Feb 2026 | Direct | |||
| Catherine T. Doherty | DGX | Common Stock | Tax liability | -1.64% | -1,161 | 69,835 | 18 Feb 2026 | Direct | ||
| Catherine T. Doherty | DGX | Common Stock | Award | 4.3% | 2,928 | 70,996 | 18 Feb 2026 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.