Quest Diagnostics Inc (DGX) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 2, 2026.
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- Filings shown
- 12
- Open-market buys
- 0
- Open-market sells
- 5
Counts cover the 12 most recent Form 4 filings Tradune holds for DGX (filed Jul 27 – Oct 2, 2026). No completed check of DGX's Form 4 list on SEC EDGAR is on record yet; the latest DGX filing Tradune holds was filed Oct 2, 2026. This is not guaranteed to be the complete record — see DGX's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 12 filings Tradune holds for DGX filed Jul 27 – Oct 2, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
5 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 5 sales· 34,277 sh
- checkbox disclosed
- On filings with the box not checked
- 0 sales· 0 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Michael E. PrevoznikSVP & General Counsel | 0 | 3 | — | 22,677 | −$5,513,083 |
| J. E. DavisCEO and President | 0 | 1 | — | 10,000 | −$2,427,200 |
| Mark E. DelaneySVP & Chief Commercial Officer | 0 | 1 | — | 1,600 | −$376,288 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at DGX
No open-market insider purchases (Form 4 code P) were reported for DGX in the trailing 90 days. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Phantom Stock Units | 135 | — | — | — | Oct 1, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 10,000 | $242.72 | 122,423 | −7.6% | Sep 1, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 16,010 | $242.88 | 44,224 | −27% | Aug 28, 2026 |
| Open-market sale 10b5-1 box checked | 6,237 | $243.63 | 37,987 | −14% | Aug 28, 2026 |
| Open-market sale 10b5-1 box checked | 430 | $244.51 | 37,557 | −1.1% | Aug 28, 2026 |
| Gift | 1,000 | — | 36,557 | −2.7% | Aug 28, 2026 |
| Option exercise Non-Qualifed Stock Option (right to buy) | 22,677 | $112.17 | — | — | Aug 28, 2026 |
| Option exercise | 22,677 | $112.17 | 60,234 | +60% | Aug 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,600 | $235.18 | 10,335 | −13% | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 37 | $206.81 | 13,557 | +0.3% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 11 | $206.80 | 3,864 | +0.3% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 72 | $206.81 | 18,386 | +0.4% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 46 | $206.81 | 15,293 | +0.3% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 21 | $206.81 | 22,460 | +0.1% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 102 | $206.81 | 33,478 | +0.3% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 6 | $206.81 | 10,323 | +0.1% | Jul 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Small acquisition (Rule 16a-6) | 34 | $206.81 | 11,935 | +0.3% | Jul 22, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to DGX's (Oct 2, 2026).
Frequently asked about DGX insider activity
How many insiders bought DGX stock in the last 90 days?
No open-market purchases (Form 4 code P) of DGX shares were reported by Quest Diagnostics Inc insiders in the trailing 90 days. The 12 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for DGX?
The most recent Form 4 on this page was filed by Timothy C. Wentworth (Director) on Oct 2, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market DGX insider sale shown?
The largest open-market sale among the filings shown was 16,010 DGX shares at $242.88 (about $3,888,437) by Michael E. Prevoznik (SVP & General Counsel) on Aug 28, 2026. Value is shares × the price reported on the Form 4; that Form 4 has the Rule 10b5-1 box checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track DGX insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.