Quest Diagnostics insider activity
What the executives and directors of Quest Diagnostics actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$43M
net open-market flow, 12 m
0 open-market buys, 12 m
97.5%
of sale value on 10b5-1 plans, 12 m
4,522 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 149 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Aug 28, 2026 | PREVOZNIK MICHAEL E | 24K |
| Jul 22, 2026 | Gregg Vicky B | 72 |
| Jul 22, 2026 | SAMAD SAM | 102 |
| Jun 4, 2026 | KUPPUSAMY KARTHIK | 8,147 |
| May 20, 2026 | PFEIFFER GARY M | 1,142 |
| May 20, 2026 | MAIN TIMOTHY L | 1,142 |
| May 20, 2026 | CARTER ROBERT B | 1,142 |
| May 20, 2026 | RING TIMOTHY M | 1,142 |
| May 20, 2026 | MORRISON DENISE M | 1,142 |
| May 20, 2026 | WENTWORTH TIMOTHY C | 1,142 |
| May 20, 2026 | Gregg Vicky B | 1,142 |
| May 20, 2026 | Doi Tracey | 1,142 |
| May 20, 2026 | Diaz Luis | 1,142 |
| May 20, 2026 | Lassiter Wright III | 1,142 |
| Apr 20, 2026 | Gregg Vicky B | 68 |
| Apr 20, 2026 | SAMAD SAM | 108 |
| Mar 9, 2026 | WENTWORTH TIMOTHY C | 215 |
| Mar 4, 2026 | PREVOZNIK MICHAEL E | 11K |
| Mar 4, 2026 | Plewman Patrick | 8,739 |
| Mar 4, 2026 | Doherty Catherine T. | 18K |
| Mar 4, 2026 | Davis J. E. | 81K |
| Mar 4, 2026 | SAMAD SAM | 23K |
| Mar 4, 2026 | Deppe Michael J | 2,311 |
| Mar 4, 2026 | KUPPUSAMY KARTHIK | 6,405 |
| Mar 4, 2026 | DELANEY MARK E | 8,196 |
| Feb 18, 2026 | PREVOZNIK MICHAEL E | 2,661 |
| Feb 18, 2026 | Plewman Patrick | 2,489 |
| Feb 18, 2026 | Doherty Catherine T. | 4,089 |
| Feb 18, 2026 | Davis J. E. | 22K |
| Feb 18, 2026 | SAMAD SAM | 5,830 |
| Feb 18, 2026 | Deppe Michael J | 548 |
| Feb 18, 2026 | KUPPUSAMY KARTHIK | 2,646 |
| Feb 18, 2026 | DELANEY MARK E | 2,021 |
| Feb 13, 2026 | Doherty Catherine T. | 26K |
| Feb 10, 2026 | Plewman Patrick | 5,662 |
| Jan 28, 2026 | Plewman Patrick | 48 |
| Jan 28, 2026 | SAMAD SAM | 69 |
| Nov 25, 2025 | Davis J. E. | 55K |
| Nov 18, 2025 | DELANEY MARK E | 7,946 |
| Nov 5, 2025 | Davis J. E. | 7,143 |
| Oct 21, 2025 | CARTER ROBERT B | 6 |
| Oct 21, 2025 | Plewman Patrick | 46 |
| Oct 21, 2025 | Gregg Vicky B | 70 |
| Oct 21, 2025 | SAMAD SAM | 68 |
| Oct 21, 2025 | KUPPUSAMY KARTHIK | 15 |
| Oct 21, 2025 | DELANEY MARK E | 15 |
| Sep 26, 2025 | PREVOZNIK MICHAEL E | 29K |
| Aug 19, 2025 | Plewman Patrick | 4,532 |
| Aug 13, 2025 | KUPPUSAMY KARTHIK | 123 |
| Aug 6, 2025 | Plewman Patrick | 3,560 |
| Jul 30, 2025 | KUPPUSAMY KARTHIK | 8,269 |
| Jul 16, 2025 | SAMAD SAM | 850 |
| May 15, 2025 | PFEIFFER GARY M | 1,203 |
| May 15, 2025 | MAIN TIMOTHY L | 1,203 |
| May 15, 2025 | CARTER ROBERT B | 1,203 |
| May 15, 2025 | RING TIMOTHY M | 1,203 |
| May 15, 2025 | MORRISON DENISE M | 1,203 |
| May 15, 2025 | Gregg Vicky B | 1,203 |
| May 15, 2025 | Doi Tracey | 1,203 |
| May 15, 2025 | Diaz Luis | 1,203 |
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
The chart, in numbers
| Flow | Shares |
|---|---|
| Granted | 146K |
| Vested / exercised | 154K |
| Other in | 404 |
| Withheld for tax | 73K |
| Planned sales (10b5-1) | 203K |
| Discretionary sales | 5,360 |
| Gifts | 1,000 |
| Kept | 18K |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| Doherty Catherine T. | 69K | 67K | 97.7 |
| PREVOZNIK MICHAEL E | 39K | 37K | 94.2 |
| Deppe Michael J | 27K | 35K | 131.7 |
| SAMAD SAM | 20K | 33K | 164.2 |
Who holds what
the 14 largest holdings of 19| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| Davis J. E. CEO and President Last trade Sep 1, 2026 | CEO | 122K | – | $17M | net selling over the year: 0 months buying, 4 months selling | Sep 1, 2026 |
| Doherty Catherine T. EVP, Regional Businesses Last trade Mar 5, 2026 | Officer | 67K | – | $7.0M | net selling over the year: 0 months buying, 2 months selling | Mar 5, 2026 |
| PREVOZNIK MICHAEL E Senior VP & General Counsel Last trade Aug 28, 2026 | Officer | 64K | – | $12M | net selling over the year: 0 months buying, 4 months selling | Aug 28, 2026 |
| Deppe Michael J SVP, Corp. Controller & CAO Last trade Nov 6, 2024 | Officer | 36K | – | – | Nov 6, 2024 | |
| SAMAD SAM Executive Vice President & CFO | CFO | 33K | – | – | – | |
| RING TIMOTHY M Last trade Dec 1, 2022 | Director | 31K | – | – | Dec 1, 2022 | |
| PFEIFFER GARY M Last trade Oct 22, 2025 | Director | 31K | – | $270K | net selling over the year: 0 months buying, 1 month selling | Oct 22, 2025 |
| MAIN TIMOTHY L Last trade Feb 6, 2014 | Director | 22K | – | – | Feb 6, 2014 | |
| Gregg Vicky B Last trade Nov 25, 2025 | Director | 18K | – | $240K | net selling over the year: 0 months buying, 1 month selling | Nov 25, 2025 |
| Plewman Patrick SVP for Diagnostic Services Last trade Mar 5, 2026 | Officer | 15K | – | $2.0M | net selling over the year: 0 months buying, 2 months selling | Mar 5, 2026 |
| KUPPUSAMY KARTHIK SVP, Clinical Solutions Last trade Jun 4, 2026 | Officer | 14K | – | $2.2M | net selling over the year: 0 months buying, 2 months selling | Jun 4, 2026 |
| MORRISON DENISE M | Director | 12K | – | – | – | |
| DELANEY MARK E SVP & Chief Commercial Officer Last trade Jul 28, 2026 | Officer | 10K | – | $1.9M | net selling over the year: 0 months buying, 2 months selling | Jul 28, 2026 |
| Lassiter Wright III | Director | 10K | – | – | – |
Open-market trade log
the 60 most recent of 573| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Sep 1, 2026 | Davis J. E. (CEO) 10K shares $242.72 +0.0% since trade filed Sep 3, 2026 | Planned sale (10b5-1) | 10K | $242.72 | $2.4M | +0.0% | Sep 3, 2026 |
| Aug 28, 2026 | PREVOZNIK MICHAEL E (Officer) 430 shares $244.51 −0.7% since trade filed Aug 31, 2026 | Planned sale (10b5-1) | 430 | $244.51 | $105K | −0.7% | Aug 31, 2026 |
| Aug 28, 2026 | PREVOZNIK MICHAEL E (Officer) 6,237 shares $243.63 −0.4% since trade filed Aug 31, 2026 | Planned sale (10b5-1) | 6,237 | $243.63 | $1.5M | −0.4% | Aug 31, 2026 |
| Aug 28, 2026 | PREVOZNIK MICHAEL E (Officer) 16K shares $242.88 −0.1% since trade filed Aug 31, 2026 | Planned sale (10b5-1) | 16K | $242.88 | $3.9M | −0.1% | Aug 31, 2026 |
| Jul 28, 2026 | DELANEY MARK E (Officer) 1,600 shares $235.18 +3.2% since trade filed Jul 29, 2026 | Planned sale (10b5-1) | 1,600 | $235.18 | $376K | +3.2% | Jul 29, 2026 |
| Jun 4, 2026 | KUPPUSAMY KARTHIK (Officer) 8,147 shares $200.00 +21.4% since trade filed Jun 8, 2026 | Planned sale (10b5-1) | 8,147 | $200.00 | $1.6M | +21.4% | Jun 8, 2026 |
| Jun 1, 2026 | Davis J. E. (CEO) 10K shares $194.14 +25.0% since trade filed Jun 2, 2026 | Planned sale (10b5-1) | 10K | $194.14 | $1.9M | +25.0% | Jun 2, 2026 |
| Mar 5, 2026 | PREVOZNIK MICHAEL E (Officer) 3,878 shares $206.21 +17.7% since trade filed Mar 6, 2026 | Planned sale (10b5-1) | 3,878 | $206.21 | $800K | +17.7% | Mar 6, 2026 |
| Mar 5, 2026 | Plewman Patrick (Officer) 2,855 shares $206.21 +17.7% since trade filed Mar 6, 2026 | Planned sale (10b5-1) | 2,855 | $206.21 | $589K | +17.7% | Mar 6, 2026 |
| Mar 5, 2026 | Doherty Catherine T. (Officer) 5,558 shares $206.21 +17.7% since trade filed Mar 6, 2026 | Planned sale (10b5-1) | 5,558 | $206.21 | $1.1M | +17.7% | Mar 6, 2026 |
| Mar 4, 2026 | KUPPUSAMY KARTHIK (Officer) 2,628 shares $204.86 +18.5% since trade filed Mar 6, 2026 | Discretionary sale | 2,628 | $204.86 | $538K | +18.5% | Mar 6, 2026 |
| Mar 3, 2026 | PREVOZNIK MICHAEL E (Officer) 526 shares $207.73 +16.8% since trade filed Mar 4, 2026 | Planned sale (10b5-1) | 526 | $207.73 | $109K | +16.8% | Mar 4, 2026 |
| Mar 3, 2026 | Plewman Patrick (Officer) 410 shares $207.73 +16.8% since trade filed Mar 4, 2026 | Planned sale (10b5-1) | 410 | $207.73 | $85K | +16.8% | Mar 4, 2026 |
| Mar 3, 2026 | Doherty Catherine T. (Officer) 632 shares $207.73 +16.8% since trade filed Mar 4, 2026 | Planned sale (10b5-1) | 632 | $207.73 | $131K | +16.8% | Mar 4, 2026 |
| Mar 2, 2026 | Davis J. E. (CEO) 10K shares $212.52 +14.2% since trade filed Mar 4, 2026 | Planned sale (10b5-1) | 10K | $212.52 | $2.1M | +14.2% | Mar 4, 2026 |
| Feb 19, 2026 | PREVOZNIK MICHAEL E (Officer) 1,111 shares $204.83 +18.5% since trade filed Feb 20, 2026 | Planned sale (10b5-1) | 1,111 | $204.83 | $228K | +18.5% | Feb 20, 2026 |
| Feb 19, 2026 | Plewman Patrick (Officer) 958 shares $204.83 +18.5% since trade filed Feb 20, 2026 | Planned sale (10b5-1) | 958 | $204.83 | $196K | +18.5% | Feb 20, 2026 |
| Feb 19, 2026 | Doherty Catherine T. (Officer) 1,433 shares $204.83 +18.5% since trade filed Feb 20, 2026 | Planned sale (10b5-1) | 1,433 | $204.83 | $294K | +18.5% | Feb 20, 2026 |
| Feb 13, 2026 | Doherty Catherine T. (Officer) 351 shares $209.10 +16.1% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 351 | $209.10 | $73K | +16.1% | Feb 17, 2026 |
| Feb 13, 2026 | Doherty Catherine T. (Officer) 1,619 shares $208.21 +16.6% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 1,619 | $208.21 | $337K | +16.6% | Feb 17, 2026 |
| Feb 13, 2026 | Doherty Catherine T. (Officer) 3,500 shares $207.08 +17.2% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 3,500 | $207.08 | $725K | +17.2% | Feb 17, 2026 |
| Feb 13, 2026 | Doherty Catherine T. (Officer) 10K shares $206.37 +17.6% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 10K | $206.37 | $2.1M | +17.6% | Feb 17, 2026 |
| Feb 13, 2026 | Doherty Catherine T. (Officer) 11K shares $205.21 +18.3% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 11K | $205.21 | $2.2M | +18.3% | Feb 17, 2026 |
| Feb 10, 2026 | Plewman Patrick (Officer) 5,662 shares $204.00 +19.0% since trade filed Feb 12, 2026 | Planned sale (10b5-1) | 5,662 | $204.00 | $1.2M | +19.0% | Feb 12, 2026 |
| Nov 25, 2025 | Gregg Vicky B (Director) 1,250 shares $191.76 +26.6% since trade filed Nov 28, 2025 | Discretionary sale | 1,250 | $191.76 | $240K | +26.6% | Nov 28, 2025 |
| Nov 25, 2025 | Davis J. E. (CEO) 4,747 shares $192.97 +25.8% since trade filed Nov 28, 2025 | Planned sale (10b5-1) | 4,747 | $192.97 | $916K | +25.8% | Nov 28, 2025 |
| Nov 25, 2025 | Davis J. E. (CEO) 9,342 shares $191.59 +26.7% since trade filed Nov 28, 2025 | Planned sale (10b5-1) | 9,342 | $191.59 | $1.8M | +26.7% | Nov 28, 2025 |
| Nov 25, 2025 | Davis J. E. (CEO) 41K shares $192.27 +26.2% since trade filed Nov 28, 2025 | Planned sale (10b5-1) | 41K | $192.27 | $7.9M | +26.2% | Nov 28, 2025 |
| Nov 18, 2025 | DELANEY MARK E (Officer) 7,946 shares $187.35 +29.6% since trade filed Nov 20, 2025 | Planned sale (10b5-1) | 7,946 | $187.35 | $1.5M | +29.6% | Nov 20, 2025 |
| Oct 22, 2025 | PFEIFFER GARY M (Director) 1,482 shares $182.40 +33.1% since trade filed Oct 24, 2025 | Discretionary sale | 1,482 | $182.40 | $270K | +33.1% | Oct 24, 2025 |
| Sep 26, 2025 | PREVOZNIK MICHAEL E (Officer) 83 shares $187.22 +29.6% since trade filed Sep 30, 2025 | Planned sale (10b5-1) | 83 | $187.22 | $16K | +29.6% | Sep 30, 2025 |
| Sep 26, 2025 | PREVOZNIK MICHAEL E (Officer) 144 shares $188.66 +28.7% since trade filed Sep 30, 2025 | Planned sale (10b5-1) | 144 | $188.66 | $27K | +28.7% | Sep 30, 2025 |
| Sep 24, 2025 | PREVOZNIK MICHAEL E (Officer) 175 shares $187.02 +29.8% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 175 | $187.02 | $33K | +29.8% | Sep 25, 2025 |
| Sep 23, 2025 | PREVOZNIK MICHAEL E (Officer) 28K shares $187.12 +29.7% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 28K | $187.12 | $5.3M | +29.7% | Sep 25, 2025 |
| Aug 21, 2025 | Plewman Patrick (Officer) 1,975 shares $185.00 +31.2% since trade filed Aug 25, 2025 | Planned sale (10b5-1) | 1,975 | $185.00 | $365K | +31.2% | Aug 25, 2025 |
| Aug 19, 2025 | Plewman Patrick (Officer) 4,532 shares $183.00 +32.6% since trade filed Aug 21, 2025 | Planned sale (10b5-1) | 4,532 | $183.00 | $829K | +32.6% | Aug 21, 2025 |
| Aug 15, 2025 | Plewman Patrick (Officer) 1,975 shares $180.00 +34.8% since trade filed Aug 19, 2025 | Planned sale (10b5-1) | 1,975 | $180.00 | $356K | +34.8% | Aug 19, 2025 |
| Aug 6, 2025 | Plewman Patrick (Officer) 1,975 shares $175.00 +38.7% since trade filed Aug 8, 2025 | Planned sale (10b5-1) | 1,975 | $175.00 | $346K | +38.7% | Aug 8, 2025 |
| Aug 6, 2025 | Plewman Patrick (Officer) 3,560 shares $175.00 +38.7% since trade filed Aug 8, 2025 | Planned sale (10b5-1) | 3,560 | $175.00 | $623K | +38.7% | Aug 8, 2025 |
| Jul 31, 2025 | KUPPUSAMY KARTHIK (Officer) 2,210 shares $170.00 +42.8% since trade filed Aug 1, 2025 | Planned sale (10b5-1) | 2,210 | $170.00 | $376K | +42.8% | Aug 1, 2025 |
| Jul 30, 2025 | KUPPUSAMY KARTHIK (Officer) 3,045 shares $167.40 +45.0% since trade filed Aug 1, 2025 | Planned sale (10b5-1) | 3,045 | $167.40 | $510K | +45.0% | Aug 1, 2025 |
| Jul 30, 2025 | KUPPUSAMY KARTHIK (Officer) 5,224 shares $167.40 +45.0% since trade filed Aug 1, 2025 | Planned sale (10b5-1) | 5,224 | $167.40 | $874K | +45.0% | Aug 1, 2025 |
| May 13, 2025 | DELANEY MARK E (Officer) 874 shares $175.31 +38.5% since trade filed May 14, 2025 | Planned sale (10b5-1) | 874 | $175.31 | $153K | +38.5% | May 14, 2025 |
| May 12, 2025 | DELANEY MARK E (Officer) 874 shares $175.72 +38.1% since trade filed May 14, 2025 | Planned sale (10b5-1) | 874 | $175.72 | $154K | +38.1% | May 14, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 267 shares $169.60 +43.1% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 267 | $169.60 | $45K | +43.1% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 453 shares $169.63 +43.1% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 453 | $169.63 | $77K | +43.1% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 584 shares $168.70 +43.9% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 584 | $168.70 | $99K | +43.9% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 704 shares $169.63 +43.1% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 704 | $169.63 | $119K | +43.1% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 750 shares $167.86 +44.6% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 750 | $167.86 | $126K | +44.6% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 902 shares $168.79 +43.8% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 902 | $168.79 | $152K | +43.8% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 1,411 shares $168.76 +43.8% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 1,411 | $168.76 | $238K | +43.8% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 1,493 shares $167.88 +44.6% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 1,493 | $167.88 | $251K | +44.6% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 2,366 shares $168.03 +44.5% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 2,366 | $168.03 | $398K | +44.5% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 2,493 shares $169.57 +43.1% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 2,493 | $169.57 | $423K | +43.1% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 2,764 shares $169.56 +43.2% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 2,764 | $169.56 | $469K | +43.2% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 4,905 shares $168.72 +43.9% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 4,905 | $168.72 | $828K | +43.9% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 5,900 shares $168.66 +43.9% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 5,900 | $168.66 | $995K | +43.9% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 6,950 shares $167.86 +44.6% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 6,950 | $167.86 | $1.2M | +44.6% | Apr 4, 2025 |
| Apr 2, 2025 | Davis J. E. (CEO) 7,249 shares $167.86 +44.6% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 7,249 | $167.86 | $1.2M | +44.6% | Apr 4, 2025 |
| Apr 2, 2025 | KUPPUSAMY KARTHIK (Officer) 2,555 shares $170.00 +42.8% since trade filed Apr 4, 2025 | Planned sale (10b5-1) | 2,555 | $170.00 | $434K | +42.8% | Apr 4, 2025 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
240 Forms 4, 3 years
40 filed late
0 amendments
2.9 avg. days to file
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.