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Quest Diagnostics Inc

DGX
Exchange
NYSE
Industry
Services-Medical Laboratories
SEC CIK
0001022079

In the last 90 days, Quest Diagnostics Inc insiders filed 0 open-market purchases and 4 sales; 1,115 institutions reported holding it in 13F filings for Q2 2026, worth $22.2B in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
3.73M
Shares, settlement Oct 30, 2026
Change
+160.2K
+4.5% vs. Oct 15, 2026
Days to cover
3.64
Short interest ÷ average daily volume
Average daily volume
1.02M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,381,971 sharesNov 15, 2024: 2,589,239 sharesNov 29, 2024: 2,038,532 sharesDec 13, 2024: 1,909,937 sharesDec 31, 2024: 2,032,747 sharesJan 15, 2025: 2,269,910 sharesJan 31, 2025: 2,580,994 sharesFeb 14, 2025: 2,956,503 sharesFeb 28, 2025: 2,565,047 sharesMar 14, 2025: 2,762,021 sharesMar 31, 2025: 2,858,546 sharesApr 15, 2025: 3,499,640 sharesApr 30, 2025: 4,013,893 sharesMay 15, 2025: 3,899,358 sharesMay 30, 2025: 3,823,834 sharesJun 13, 2025: 3,639,500 sharesJun 30, 2025: 4,978,330 sharesJul 15, 2025: 4,575,330 sharesJul 31, 2025: 4,737,697 sharesAug 15, 2025: 4,031,308 sharesAug 29, 2025: 4,249,168 sharesSep 15, 2025: 4,421,542 sharesSep 30, 2025: 4,328,978 sharesOct 15, 2025: 3,949,817 sharesOct 31, 2025: 4,614,227 sharesNov 14, 2025: 4,294,155 sharesNov 28, 2025: 4,299,681 sharesDec 15, 2025: 4,225,484 sharesDec 31, 2025: 5,848,033 sharesJan 15, 2026: 5,719,590 sharesJan 30, 2026: 5,823,118 sharesFeb 13, 2026: 4,771,280 sharesFeb 27, 2026: 3,872,414 sharesMar 13, 2026: 3,871,587 sharesMar 31, 2026: 4,174,813 sharesApr 15, 2026: 3,551,568 sharesApr 30, 2026: 3,389,572 sharesMay 15, 2026: 3,715,019 sharesMay 29, 2026: 3,430,849 sharesJun 15, 2026: 3,419,621 sharesJun 30, 2026: 3,732,507 sharesJul 15, 2026: 3,509,407 sharesJul 31, 2026: 3,684,192 sharesAug 14, 2026: 3,321,414 sharesAug 31, 2026: 3,445,561 sharesSep 15, 2026: 3,600,559 sharesSep 30, 2026: 3,417,577 sharesOct 15, 2026: 3,573,902 sharesOct 30, 2026: 3,734,103 shares
Short interest in DGX by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20263.73M+160.2K+4.5%1.02M3.64
Oct 15, 20263.57M+156.3K+4.6%1.06M3.38
Sep 30, 20263.42M−183.0K−5.1%1.27M2.69
Sep 15, 20263.60M+155.0K+4.5%975.6K3.69
Aug 31, 20263.45M+124.1K+3.7%893.7K3.86
Aug 14, 20263.32M−362.8K−9.9%711.5K4.67
Jul 31, 20263.68M+174.8K+5.0%1.34M2.74
Jul 15, 20263.51M−223.1K−6.0%823.8K4.26
Jun 30, 20263.73M+312.9K+9.2%971.2K3.84
Jun 15, 20263.42M−11.2K−0.3%802.9K4.26
May 29, 20263.43M−284.2K−7.7%822.2K4.17
May 15, 20263.72M+325.4K+9.6%744.8K4.99
Apr 30, 20263.39M−162.0K−4.6%1.31M2.59
Apr 15, 20263.55M−623.2K−14.9%771.8K4.60
Mar 31, 20264.17M+303.2K+7.8%936.7K4.46
Mar 13, 20263.87M−8270.0%744.9K5.20
Feb 27, 20263.87M−898.9K−18.8%845.2K4.58
Feb 13, 20264.77M−1.05M−18.1%1.46M3.27
Jan 30, 20265.82M+103.5K+1.8%1.03M5.63
Jan 15, 20265.72M−128.4K−2.2%968.7K5.90
Dec 31, 20255.85M+1.62M+38.4%873.9K6.69
Dec 15, 20254.23M−74.2K−1.7%988.1K4.28
Nov 28, 20254.30M+5.53K+0.1%1.22M3.54
Nov 14, 20254.29M−320.1K−6.9%1.11M3.87
Oct 31, 20254.61M+664.4K+16.8%1.32M3.49
Oct 15, 20253.95M−379.2K−8.8%980.2K4.03
Sep 30, 20254.33M−92.6K−2.1%757.4K5.72
Sep 15, 20254.42M+172.4K+4.1%616.2K7.18
Aug 29, 20254.25M+217.9K+5.4%826.0K5.14
Aug 15, 20254.03M−706.4K−14.9%845.2K4.77
Jul 31, 20254.74M+162.4K+3.6%1.65M2.88
Jul 15, 20254.58M−403.0K−8.1%967.6K4.73
Jun 30, 20254.98M+1.34M+36.8%922.5K5.40
Jun 13, 20253.64M−184.3K−4.8%704.0K5.17
May 30, 20253.82M−75.5K−1.9%1.23M3.11
May 15, 20253.90M−114.5K−2.9%1.17M3.35
Apr 30, 20254.01M+514.3K+14.7%1.51M2.66
Apr 15, 20253.50M+641.1K+22.4%1.81M1.93
Mar 31, 20252.86M+96.5K+3.5%1.11M2.58
Mar 14, 20252.76M+197.0K+7.7%1.34M2.06
Feb 28, 20252.57M−391.5K−13.2%1.15M2.23
Feb 14, 20252.96M+375.5K+14.6%981.4K3.01
Jan 31, 20252.58M+311.1K+13.7%1.33M1.95
Jan 15, 20252.27M+237.2K+11.7%716.8K3.17
Dec 31, 20242.03M+122.8K+6.4%722.6K2.81
Dec 13, 20241.91M−128.6K−6.3%820.5K2.33
Nov 29, 20242.04M−550.7K−21.3%780.8K2.61
Nov 15, 20242.59M+207.3K+8.7%979.6K2.64
Oct 31, 20242.38M+55.9K+2.4%954.5K2.50

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in DGX by settlement date
Settlement dateSharesPriceValue
Oct 6, 202657$232.22$13.2K
Oct 5, 20266,712$233.33$1.57M
Oct 2, 20265,864$231.09$1.36M
Sep 23, 20261,056$234.76$247.9K
Sep 21, 20262,262$246.45$557.5K
Sep 10, 202613$235.46$3.06K
Aug 28, 202628$244.61$6.85K
Aug 25, 202653$243.87$12.9K
Aug 24, 2026191$244.39$46.7K
Aug 20, 20262,302$241.76$556.5K
Aug 18, 2026754$235.52$177.6K
Aug 7, 20261$238.50$238.5
Aug 3, 20262,118$233.01$493.5K
Jul 29, 202620$235.94$4.72K
Jul 8, 20266,909$212.38$1.47M
Jul 2, 202683$216.02$17.9K
Jul 1, 2026233$211.95$49.4K
Jun 30, 20265,459$212.64$1.16M
Jun 29, 2026201$209.88$42.2K
Jun 24, 20266$197.18$1.18K
Jun 23, 20261,541$193.58$298.3K
Jun 22, 20261,541$195.00$300.5K
Jun 3, 20266,855$193.16$1.32M
Jun 2, 20268,172$192.20$1.57M
Jun 1, 20264,500$194.90$877.0K
May 29, 202623,804$196.20$4.67M
May 15, 20261,590$187.94$298.8K
May 8, 20262,927$190.84$558.6K
Apr 29, 2026537$195.05$104.7K
Apr 28, 202631$196.63$6.10K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in DGX by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 11, 2026186,3570307,45360.6%
Nov 10, 2026184,1770291,69363.1%
Nov 9, 2026253,0570391,13264.7%
Nov 6, 2026280,5828363,65277.2%
Nov 5, 2026242,3788345,80470.1%
Nov 4, 2026228,5370414,95555.1%
Nov 3, 2026292,5280403,74172.5%
Nov 2, 2026302,1213,814386,12578.2%
Oct 30, 2026314,4470381,21082.5%
Oct 29, 2026252,7190347,65172.7%
Oct 28, 2026232,0500351,83866.0%
Oct 27, 2026315,010259430,74073.1%
Oct 26, 2026290,82750388,05874.9%
Oct 23, 2026288,58133382,17575.5%
Oct 22, 2026419,5090661,28063.4%
Oct 21, 2026320,0760437,60273.1%
Oct 20, 2026163,4290388,91242.0%
Oct 19, 2026179,60536343,18552.3%
Oct 16, 2026137,8100279,77349.3%
Oct 15, 2026121,63220352,77134.5%
Oct 14, 2026144,6395427,13033.9%
Oct 13, 2026133,475123411,27432.5%
Oct 12, 2026122,1400424,99228.7%
Oct 9, 2026159,6360260,71161.2%
Oct 8, 2026227,0613334,59567.9%
Oct 7, 2026210,7840310,07868.0%
Oct 6, 2026291,597600708,84041.1%
Oct 5, 2026252,2953386,33565.3%
Oct 2, 2026152,370736434,25535.1%
Oct 1, 2026171,17465421,25140.6%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in DGX
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T11,841,62252,159529,87717,05577.7%
Oct 12, 2026T11,578,55147,057573,30115,06273.4%
Oct 5, 2026T11,715,76245,311488,24816,19577.8%
Sep 28, 2026T11,947,60252,127803,18617,02070.8%
Sep 21, 2026T12,353,64159,661702,24917,62677.0%
Sep 14, 2026T11,940,73746,530582,08517,21176.9%
Sep 7, 2026T11,369,58837,246309,28211,49781.6%
Aug 31, 2026T11,421,32144,421711,94315,36066.6%
Aug 24, 2026T11,239,23936,214545,04413,21469.5%
Aug 17, 2026T11,417,81342,015481,32013,86374.7%
Aug 10, 2026T11,115,38838,337375,08611,41774.8%
Aug 3, 2026T11,022,65639,762451,39015,70769.4%