| $385M | ||
| $350M | ||
| $215M | ||
| $107M | ||
| $100M | ||
| $91M |
Buys | $0 | 0 | 0 |
Sells | $37,816,742 | 27 | 100 |
| Gregg Vicky B | director | 0 | $0 | 1 | $239,700 | $-239,700 |
| DELANEY MARK E | SVP & Chief Commercial Officer | 0 | $0 | 1 | $1.49M | $-1.49M |
| KUPPUSAMY KARTHIK | SVP, Clinical Solutions | 0 | $0 | 4 | $3.42M | $-3.42M |
| Plewman Patrick | SVP for Diagnostic Services | 0 | $0 | 8 | $4.54M | $-4.54M |
| PREVOZNIK MICHAEL E | SVP & General Counsel | 0 | $0 | 6 | $6.51M | $-6.51M |
| Doherty Catherine T. | EVP, Regional Businesses | 0 | $0 | 4 | $6.96M | $-6.96M |
| Davis J. E. | CEO and President | 0 | $0 | 3 | $14.66M | $-14.66M |
Quest Diagnostics Incorporated, founded in 1967 and headquartered in Secaucus, New Jersey, is a premier provider of diagnostic testing, information, and related services, serving clients both domestically and internationally. Its core business involves the development and provision of diverse diagnostic information services, such as routine, advanced clinical, and anatomic pathology testing. While primarily operating under the Quest Diagnostics brand, it also leverages specialized identities like AmeriPath, Dermpath Diagnostics, ExamOne, and Quanum to reach a broad spectrum of clients. Its extensive client base includes patients, clinicians, hospitals, integrated delivery networks, health plans, employers, and other direct healthcare entities. Delivery of these services is facilitated through a robust network comprising laboratories, patient service centers, in-office phlebotomists, call centers, and mobile health professionals including paramedics and nurses. Additionally, the company provides risk assessment services for the life insurance industry and offers comprehensive information technology solutions to healthcare organizations and clinicians.
Over the last 12 months, insiders at Quest Diagnostics Incorporated have bought $0 and sold $37.82M worth of Quest Diagnostics Incorporated stock.
On average, over the past 5 years, insiders at Quest Diagnostics Incorporated have bought $0 and sold $25.14M worth of stock each year.
There was no buying activity among insiders over the last 12 months.
The last purchase of 8,000 shares for transaction amount of $444,046 was made by GUINAN MARK (Senior Vice President & CFO) on 2014‑05‑05.
| 2026-06-04 | Sale | KUPPUSAMY KARTHIK | SVP, Clinical Solutions | 8,147 0.0075% | $200.00 | $1.63M | +1.24% | |
| 2026-06-01 | Sale | Davis J. E. | CEO and President | 10,000 0.0091% | $194.14 | $1.94M | +2.65% | |
| 2026-03-05 | Sale | Doherty Catherine T. | EVP, Regional Businesses | 5,558 0.0051% | $206.21 | $1.15M | -3.97% | |
| 2026-03-05 | Sale | PREVOZNIK MICHAEL E | SVP & General Counsel | 3,878 0.0035% | $206.21 | $799,682 | -3.97% | |
| 2026-03-05 | Sale | Plewman Patrick | SVP for Diagnostic Services | 2,855 0.0026% | $206.21 | $588,730 | -3.97% | |
| 2026-03-04 | Sale | KUPPUSAMY KARTHIK | SVP, Clinical Solutions | 2,628 0.0023% | $204.86 | $538,372 | -6.03% | |
| 2026-03-03 | Sale | Doherty Catherine T. | EVP, Regional Businesses | 632 0.0006% | $207.73 | $131,285 | -5.98% | |
| 2026-03-03 | Sale | PREVOZNIK MICHAEL E | SVP & General Counsel | 526 0.0005% | $207.73 | $109,266 | -5.98% | |
| 2026-03-03 | Sale | Plewman Patrick | SVP for Diagnostic Services | 410 0.0004% | $207.73 | $85,169 | -5.98% | |
| 2026-03-02 | Sale | Davis J. E. | CEO and President | 10,000 0.009% | $212.52 | $2.13M | -6.81% | |
| 2026-02-19 | Sale | Doherty Catherine T. | EVP, Regional Businesses | 1,433 0.0013% | $204.83 | $293,521 | -2.82% | |
| 2026-02-19 | Sale | PREVOZNIK MICHAEL E | SVP & General Counsel | 1,111 0.001% | $204.83 | $227,566 | -2.82% | |
| 2026-02-19 | Sale | Plewman Patrick | SVP for Diagnostic Services | 958 0.0009% | $204.83 | $196,227 | -2.82% | |
| 2026-02-13 | Sale | Doherty Catherine T. | EVP, Regional Businesses | 26,165 0.0234% | $206.15 | $5.39M | -4.70% | |
| 2026-02-10 | Sale | Plewman Patrick | SVP for Diagnostic Services | 5,662 0.005% | $204.00 | $1.16M | -3.99% | |
| 2025-11-25 | Sale | Davis J. E. | CEO and President | 55,093 0.0495% | $192.22 | $10.59M | +0.92% | |
| 2025-11-25 | Sale | Gregg Vicky B | director | 1,250 0.0011% | $191.76 | $239,700 | +0.92% | |
| 2025-11-18 | Sale | DELANEY MARK E | SVP & Chief Commercial Officer | 7,946 0.0072% | $187.35 | $1.49M | +4.26% | |
| 2025-09-26 | Sale | PREVOZNIK MICHAEL E | SVP & General Counsel | 227 0.0002% | $188.13 | $42,706 | +1.25% | |
| 2025-09-24 | Sale | PREVOZNIK MICHAEL E | SVP & General Counsel | 175 0.0002% | $187.02 | $32,729 | +2.36% |
| Davis J. E. | CEO and President | 132423 0.1196% | $27.08M | 0 | 16 | |
| Doherty Catherine T. | EVP, Regional Businesses | 67122 0.0606% | $13.73M | 0 | 45 | |
| PREVOZNIK MICHAEL E | SVP & General Counsel | 37557 0.0339% | $7.68M | 0 | 77 | |
| Gregg Vicky B | director | 17037 0.0154% | $3.48M | 0 | 3 | |
| Plewman Patrick | SVP for Diagnostic Services | 15198 0.0137% | $3.11M | 0 | 9 | |
| KUPPUSAMY KARTHIK | SVP, Clinical Solutions | 13510 0.0122% | $2.76M | 0 | 8 | |
| DELANEY MARK E | SVP & Chief Commercial Officer | 7530 0.0068% | $1.54M | 0 | 5 | |
| RUSCKOWSKI STEPHEN H | Chairman, CEO and President | 334833 0.3025% | $68.48M | 2 | 16 | +0.94% |
| FREEMAN KENNETH W/NJ | Chairman of the Board | 248457 0.2244% | $50.82M | 0 | 46 | |
| MOHAPATRA SURYA N | Chairman, President & CEO | 200126 0.1808% | $40.93M | 0 | 26 | |
| HAGEMANN ROBERT | SVP & Chief Financial Officer | 154603 0.1397% | $31.62M | 0 | 34 | |
| GUINAN MARK | Executive Vice President & CFO | 73579 0.0665% | $15.05M | 1 | 5 | +14.92% |
| Miller Joan Elizabeth | SVP-Oncology & Neurology Srvcs | 73373 0.0663% | $15.01M | 0 | 20 | |
| MARRONE GERALD C | SVP, Administration | 55397 0.05% | $11.33M | 0 | 2 | |
| Simmons Wayne R. | Vice President, Operations | 47150 0.0426% | $9.64M | 0 | 4 | |
| Cunningham Everett | SVP, Commercial | 38311 0.0346% | $7.84M | 0 | 8 | |
| DEPPE MICHAEL J | SVP, Corp. Controller & CAO | 34941 0.0316% | $7.15M | 0 | 4 | |
| Cohen Jon R | SVP & Group Exec. Diag. Sol. | 31757 0.0287% | $6.5M | 0 | 4 | |
| ZEWE DAVID M | SVP, Diagnostic Testing Ops | 31079 0.0281% | $6.36M | 0 | 6 | |
| STANZIONE DANIEL | director | 28349 0.0256% | $5.8M | 1 | 9 | +6.36% |
| BUEHLER WILLIAM F | director | 26225 0.0237% | $5.36M | 0 | 6 | |
| RING TIMOTHY M | director | 24149 0.0218% | $4.94M | 0 | 7 | |
| EGLINTON MANNER CARRIE | SVP, Advanced Diagnostics | 22390 0.0202% | $4.58M | 0 | 1 | |
| BRITELL JENNE K | director | 19903 0.018% | $4.07M | 0 | 9 | |
| WILENSKY GAIL R | director | 17845 0.0161% | $3.65M | 0 | 14 | |
| ZIEGLER JOHN B | director | 16557 0.015% | $3.39M | 0 | 21 | |
| PFEIFFER GARY M | director | 13698 0.0124% | $2.8M | 0 | 7 | |
| BALDWIN JOHN C MD | director | 12949 0.0117% | $2.65M | 0 | 9 | |
| Peters Robert E | VP, Sales & Marketing | 12974 0.0117% | $2.65M | 0 | 1 | |
| BONGIORNO THOMAS F | VP and Corporate Controller | 12477 0.0113% | $2.55M | 1 | 24 | +3.62% |
| HAGGERTY ROSANNE | director | 6000 0.0054% | $1.23M | 0 | 1 | |
| LEIDEN JEFFREY M | director | 6000 0.0054% | $1.23M | 0 | 4 | |
| MAIN TIMOTHY L | director | 5658 0.0051% | $1.16M | 1 | 0 | +20.29% |
| CIRILLO MARY A | director | 4132 0.0037% | $845,117.96 | 0 | 3 | |
| Klug Robert A | VP, Corporate Controller | 3903 0.0035% | $798,280.59 | 0 | 1 | |
| GRANT WILLIAM R | director | 3334 0.003% | $681,903.02 | 0 | 2 | |
| GLAXOSMITHKLINE PLC | director, 10 percent owner | 0 0% | $0 | 0 | 6 | |
| FLAHERTY JAMES F III | director | 0 0% | $0 | 3 | 1 | +20.4% |
| BRODY KENNETH D | director | 0 0% | $0 | 0 | 9 |
| Increased Positions | 506 | +45.63% | 8M | +7.64% |
| Decreased Positions | 451 | -40.67% | 11M | -9.98% |
| New Positions | 143 | New | 2M | New |
| Sold Out Positions | 96 | Sold Out | 864,382 | Sold Out |
| Total Postitions | 1,164 | +4.96% | 107M | -2.34% |
| Vanguard Group Inc | $2.48M | 12.84% | 14.25M | +18,056 | +0.13% | 2025-09-30 |
| Blackrock, Inc. | $1.74M | 9.01% | 10M | -310,940 | -3.02% | 2025-09-30 |
| Price T Rowe Associates Inc /Md/ | $1.22M | 6.31% | 7.01M | -188,707 | -2.62% | 2025-09-30 |
| State Street Corp | $907,867.00 | 4.71% | 5.22M | +38,931 | +0.75% | 2025-09-30 |
| Jpmorgan Chase & Co | $750,319.00 | 3.89% | 4.32M | -14,269 | -0.33% | 2025-09-30 |
| Boston Partners | $701,570.00 | 3.64% | 4.04M | +997,033 | +32.8% | 2025-09-30 |
| Geode Capital Management, Llc | $527,711.00 | 2.74% | 3.04M | +54,070 | +1.81% | 2025-09-30 |
| Victory Capital Management Inc | $407,359.00 | 2.11% | 2.34M | -465,252 | -16.56% | 2025-09-30 |
| Morgan Stanley | $397,442.00 | 2.06% | 2.29M | +141,806 | +6.61% | 2025-09-30 |
| Dimensional Fund Advisors Lp | $331,506.00 | 1.72% | 1.91M | +6,155 | +0.32% | 2025-09-30 |