The Filings Report

Quest Diagnostics Inc. insider trading

DGXfinancial statementsForm 4 filings on EDGAR272 transactions since Nov 1, 2024

From August 4, 2026 to November 1, 2026, 0 insiders at Quest Diagnostics Inc. bought $0 of stock in the open market, and 3 sold $8M. Officers and directors accounted for $0 of purchases and $8M of sales. The last reported transaction was an open-market sale by Pfeiffer Gary M on October 26, 2026.

The answer card and chart use the same period. Change the range above the chart to update both. Form 4 filings through October 28, 2026; awards, option exercises, tax withholding and gifts are excluded from these totals.

Stock price and insider activity

Daily price candles with insider purchases and sales directly beneath them on the same timeline. Bars show individual days; totals sum all days in the selected period.

DGX daily priceSplit-adjusted prices in US dollars

Bought $0Sold $8MAug 4, 2026 – Nov 1, 2026

Oct 30, 2026O $255.14 · H $256.99 · L $250.95 · C $251.82Bought $0 (0)Sold $0 (0)
$221$231$240$250$2592026-08-04: open $231.95, high $234.55, low $229.76, close $233.722026-08-05: open $234.22, high $236.67, low $232.56, close $235.842026-08-06: open $237.66, high $238.88, low $235.32, close $238.502026-08-07: open $236.34, high $239.38, low $236.34, close $238.352026-08-10: open $236.53, high $239.33, low $235.85, close $237.632026-08-11: open $236.35, high $239.92, low $235.51, close $237.502026-08-12: open $234.46, high $238.51, low $232.28, close $237.772026-08-13: open $239.10, high $240.00, low $235.65, close $236.042026-08-14: open $235.82, high $237.70, low $233.69, close $234.402026-08-17: open $233.94, high $237.17, low $233.00, close $235.522026-08-18: open $238.01, high $239.38, low $236.07, close $236.252026-08-19: open $238.10, high $242.39, low $237.38, close $241.762026-08-20: open $239.86, high $245.68, low $237.53, close $241.302026-08-21: open $240.33, high $244.70, low $239.43, close $244.392026-08-24: open $243.97, high $246.00, low $242.46, close $243.872026-08-25: open $243.93, high $245.78, low $241.79, close $244.512026-08-26: open $244.11, high $246.00, low $243.49, close $245.002026-08-27: open $242.83, high $247.19, low $242.44, close $244.612026-08-28: open $245.17, high $245.28, low $242.27, close $242.762026-08-31: open $241.99, high $242.64, low $239.40, close $240.302026-09-01: open $242.72, high $243.72, low $235.63, close $236.222026-09-02: open $238.03, high $242.84, low $236.27, close $240.802026-09-03: open $242.00, high $242.00, low $236.35, close $239.402026-09-04: open $235.38, high $238.92, low $235.38, close $237.142026-09-08: open $233.61, high $237.56, low $231.52, close $235.502026-09-09: open $233.58, high $236.24, low $232.43, close $235.462026-09-10: open $236.32, high $236.48, low $228.57, close $231.102026-09-11: open $233.20, high $235.12, low $229.33, close $235.022026-09-14: open $237.49, high $239.78, low $234.67, close $237.812026-09-15: open $238.39, high $248.65, low $237.21, close $247.082026-09-16: open $245.47, high $248.57, low $244.85, close $247.082026-09-17: open $248.28, high $248.70, low $246.26, close $247.452026-09-18: open $246.52, high $247.63, low $244.89, close $246.332026-09-21: open $247.13, high $248.84, low $243.93, close $244.882026-09-22: open $228.59, high $237.29, low $227.24, close $234.852026-09-23: open $235.12, high $238.62, low $231.92, close $233.002026-09-24: open $234.08, high $237.29, low $233.55, close $236.442026-09-25: open $236.37, high $238.25, low $235.48, close $236.322026-09-28: open $234.27, high $238.10, low $233.81, close $237.622026-09-29: open $235.46, high $237.62, low $230.98, close $231.882026-09-30: open $233.33, high $236.97, low $230.84, close $233.072026-10-01: open $232.74, high $233.33, low $230.47, close $231.072026-10-02: open $230.58, high $233.48, low $228.83, close $233.332026-10-05: open $232.93, high $233.65, low $229.96, close $232.222026-10-06: open $229.92, high $232.09, low $225.78, close $228.392026-10-07: open $228.51, high $229.80, low $226.81, close $227.062026-10-08: open $228.16, high $231.08, low $226.36, close $230.812026-10-09: open $227.86, high $232.18, low $227.86, close $230.972026-10-12: open $228.66, high $234.64, low $228.66, close $232.632026-10-13: open $233.13, high $234.33, low $230.23, close $230.572026-10-14: open $231.32, high $234.97, low $231.32, close $233.582026-10-15: open $235.85, high $239.17, low $235.57, close $238.852026-10-16: open $239.67, high $240.75, low $233.56, close $235.002026-10-19: open $234.40, high $235.99, low $233.82, close $234.912026-10-20: open $236.00, high $237.29, low $234.06, close $236.892026-10-21: open $235.34, high $240.56, low $223.50, close $238.682026-10-22: open $226.50, high $246.00, low $226.22, close $243.562026-10-23: open $239.63, high $244.33, low $239.63, close $241.892026-10-26: open $243.00, high $244.22, low $240.98, close $242.932026-10-27: open $241.96, high $243.27, low $239.59, close $242.562026-10-28: open $242.96, high $249.73, low $242.34, close $245.622026-10-29: open $246.25, high $253.12, low $245.40, close $252.922026-10-30: open $255.14, high $256.99, low $250.95, close $251.82Insider purchases / sales · USD$10M$0−$10M2026-08-28: 0 purchases ($0), 3 sales ($6M)2026-09-01: 0 purchases ($0), 1 sales ($2M)2026-10-26: 0 purchases ($0), 1 sales ($292K)Aug 4Aug 26Sep 17Oct 9Oct 30

purchases above zero; sales below. Both use the transaction date and the same dollar scale. Hover, tap, or use arrow keys to inspect a date. Awards, exercises, tax withholding and gifts are excluded.

Dates with prices or insider activity are spaced evenly; empty weekends and holidays are omitted. Prices through Oct 30, 2026. Insider data through Nov 1, 2026. Prices are adjusted for splits; transaction values are reported dollars.

Every transaction

272 transactions from November 1, 2024 to November 1, 2026, newest first. Open-market purchases and sales are coloured; awards, exercises, tax withholding and gifts are grey and not counted.

TradedInsiderRoleTransactionSharesPriceValueHeld afterFiled
Oct 26, 2026Pfeiffer Gary MDirectoropen-market sale10b5-11,203$243.00$292K29,802Oct 28, 2026
Oct 21, 2026Carter Robert BDirectorsmall acquisition10$235.93$2K3,874Oct 23, 2026
Oct 21, 2026Samad SamExecutive Vice President & CFOaward90$235.94$21K33,568Oct 23, 2026
Oct 21, 2026Gregg Vicky BDirectoraward63$235.94$15K18,449Oct 23, 2026
Oct 21, 2026Kuppusamy KarthikSVP, Clinical Solutionssmall acquisition33$235.94$8K13,619Oct 23, 2026
Oct 21, 2026Lassiter Wright IIIDirectorsmall acquisition6$235.96$1K10,329Oct 23, 2026
Oct 21, 2026Plewman PatrickSVP for Diagnostic Servicessmall acquisition41$235.94$10K15,334Oct 23, 2026
Oct 21, 2026Main Timothy LDirectorsmall acquisition18$235.94$4K22,478Oct 23, 2026
Oct 21, 2026Delaney Mark ESVP & Chief Commercial Officersmall acquisition25$235.94$6K10,360Oct 23, 2026
Sep 1, 2026Davis J. E.CEO and President, Directoropen-market sale10b5-110,000$242.72$2M122,423Sep 3, 2026
Aug 28, 2026Prevoznik Michael ESVP & General Counseloption exercise22,677$112.17$3M60,234Aug 31, 2026
Aug 28, 2026Prevoznik Michael ESVP & General Counselopen-market sale10b5-116,010$242.88$4M44,224Aug 31, 2026
Aug 28, 2026Prevoznik Michael ESVP & General Counselopen-market sale10b5-16,237$243.63$2M37,987Aug 31, 2026
Aug 28, 2026Prevoznik Michael ESVP & General Counselopen-market sale10b5-1430$244.51$105K37,557Aug 31, 2026
Aug 28, 2026Prevoznik Michael ESVP & General Counselgift1,000$0.00—36,557Aug 31, 2026
Jul 28, 2026Delaney Mark ESVP & Chief Commercial Officeropen-market sale10b5-11,600$235.18$376K10,335Jul 29, 2026
Jul 22, 2026Kuppusamy KarthikSVP, Clinical Solutionssmall acquisition37$206.81$8K13,557Jul 27, 2026
Jul 22, 2026Carter Robert BDirectorsmall acquisition11$206.80$2K3,864Jul 27, 2026
Jul 22, 2026Gregg Vicky BDirectoraward72$206.81$15K18,386Jul 27, 2026
Jul 22, 2026Plewman PatrickSVP for Diagnostic Servicessmall acquisition46$206.81$10K15,293Jul 27, 2026
Jul 22, 2026Main Timothy LDirectorsmall acquisition21$206.81$4K22,460Jul 27, 2026
Jul 22, 2026Samad SamExecutive Vice President & CFOaward102$206.81$21K33,478Jul 27, 2026
Jul 22, 2026Lassiter Wright IIIDirectorsmall acquisition6$206.81$1K10,323Jul 27, 2026
Jul 22, 2026Delaney Mark ESVP & Chief Commercial Officersmall acquisition34$206.81$7K11,935Jul 27, 2026
Jun 4, 2026Kuppusamy KarthikSVP, Clinical Solutionsoption exercise3,320$127.72$424K16,830Jun 8, 2026
Jun 4, 2026Kuppusamy KarthikSVP, Clinical Solutionsoption exercise4,827$121.81$588K21,657Jun 8, 2026
Jun 4, 2026Kuppusamy KarthikSVP, Clinical Solutionsopen-market sale10b5-18,147$200.00$2M13,510Jun 8, 2026
Jun 1, 2026Davis J. E.CEO and President, Directoropen-market sale10b5-110,000$194.14$2M132,423Jun 2, 2026
May 20, 2026Carter Robert BDirectoraward1,142$0.00—3,853May 21, 2026
May 20, 2026Gregg Vicky BDirectoraward1,142$0.00—18,314May 21, 2026
May 20, 2026Diaz LuisDirectoraward1,142$0.00—5,196May 21, 2026
May 20, 2026Main Timothy LDirectoraward1,142$0.00—27,439May 21, 2026
May 20, 2026Wentworth Timothy CDirectoraward1,142$0.00—1,358May 21, 2026
May 20, 2026Doi TraceyDirectoraward1,142$0.00—7,748May 21, 2026
May 20, 2026Ring Timothy MDirectoraward1,142$0.00—31,140May 21, 2026
May 20, 2026Lassiter Wright IIIDirectoraward1,142$0.00—10,317May 21, 2026
May 20, 2026Morrison Denise MDirectoraward1,142$0.00—11,929May 21, 2026
May 20, 2026Pfeiffer Gary MDirectoraward1,142$0.00—31,005May 21, 2026
Apr 20, 2026Samad SamExecutive Vice President & CFOaward108$194.70$21K33,376Apr 24, 2026
Apr 20, 2026Plewman PatrickSVP for Diagnostic Servicessmall acquisition49$194.70$10K15,247Apr 24, 2026
Apr 20, 2026Gregg Vicky BDirectoraward68$194.70$13K17,172Apr 24, 2026
Apr 20, 2026Carter Robert BDirectorsmall acquisition7$194.70$1K2,711Apr 24, 2026
Apr 20, 2026Lassiter Wright IIIDirectorsmall acquisition6$194.70$1K9,063Apr 24, 2026
Apr 20, 2026Kuppusamy KarthikSVP, Clinical Solutionssmall acquisition39$194.70$8K13,490Apr 24, 2026
Apr 20, 2026Delaney Mark ESVP & Chief Commercial Officersmall acquisition37$194.70$7K11,901Apr 24, 2026
Mar 9, 2026Wentworth Timothy CDirectoraward215$0.00—215Mar 11, 2026
Mar 5, 2026Doherty Catherine T.EVP, Regional Businessesopen-market sale10b5-15,558$206.21$1M67,122Mar 6, 2026
Mar 5, 2026Prevoznik Michael ESVP & General Counselopen-market sale10b5-13,878$206.21$800K37,557Mar 6, 2026
Mar 5, 2026Plewman PatrickSVP for Diagnostic Servicesopen-market sale10b5-12,855$206.21$589K15,198Mar 6, 2026
Mar 4, 2026Samad SamExecutive Vice President & CFOaward13,947$204.86$3M40,988Mar 6, 2026

Who the insiders are

Everyone who reported a transaction since November 1, 2024, by open-market value over twelve months. Shares held are after the insider’s latest directly held transaction.

InsiderRoleLast transactionKindShares heldBought, 12 monthsSold, 12 monthsSales under a plan
Davis J. E.CEO and President, DirectorSep 1, 2026open-market sale122,423—$17M (6)6 of 6
Doherty Catherine T.EVP, Regional BusinessesMar 5, 2026open-market sale67,122—$7M (8)8 of 8
Prevoznik Michael ESVP & General CounselAug 28, 2026option exercise60,234—$7M (6)6 of 6
Kuppusamy KarthikSVP, Clinical SolutionsOct 21, 2026small acquisition13,619—$2M (2)1 of 2
Plewman PatrickSVP for Diagnostic ServicesOct 21, 2026small acquisition15,334—$2M (4)4 of 4
Delaney Mark ESVP & Chief Commercial OfficerOct 21, 2026small acquisition10,360—$2M (2)2 of 2
Pfeiffer Gary MDirectorOct 26, 2026open-market sale29,802—$292K (1)1 of 1
Gregg Vicky BDirectorOct 21, 2026award18,449—$240K (1)0 of 1
Samad SamExecutive Vice President & CFOOct 21, 2026award33,568———
Deppe Michael JSVP, Corp. Controller & CAOMar 4, 2026award35,946———
Carter Robert BDirectorOct 21, 2026small acquisition3,874———
Lassiter Wright IIIDirectorOct 21, 2026small acquisition10,329———
Main Timothy LDirectorOct 21, 2026small acquisition22,478———
Diaz LuisDirectorMay 20, 2026award5,196———
Wentworth Timothy CDirectorMay 20, 2026award1,358———
Doi TraceyDirectorMay 20, 2026award7,748———
Ring Timothy MDirectorMay 20, 2026award31,140———
Morrison Denise MDirectorMay 20, 2026award11,929———

Questions

Are Quest Diagnostics Inc. insiders buying or selling?

Over the twelve months to November 1, 2026, 8 insiders at Quest Diagnostics Inc. sold $37M of stock in the open market, all by officers and directors, and no insider bought. Net, insiders sold $37M. Only open-market purchases and sales are counted.

Who sold the most Quest Diagnostics Inc. stock in the last year?

Davis J. E. (CEO and President, Director) sold $17M in 6 open-market sales over the twelve months to November 1, 2026.

Do Quest Diagnostics Inc. executives sell under 10b5-1 plans?

28 of the 30 open-market sales in the last twelve months (93%) were reported as made under a Rule 10b5-1 trading plan, set up in advance. A sale under a plan is still counted as a sale.

What counts as insider buying here?

Only open-market purchases (Form 4 code P) and sales (code S) by officers, directors and 10% owners. Stock awards, option exercises, shares withheld for tax and gifts are listed in the table but never counted as buying or selling.

More on Quest Diagnostics Inc.

From Form 4, 4/A and 5 filings with the SEC. A record of insider transactions, not a recommendation.