Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionShell Asset Management Co
Latest Disclosed Ownership3,371 shares
Latest Disclosed Value $ 642
Shell Asset Management Co reports 28.60% decrease in ownership of DGX / Quest Diagnostics Incorporated

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 3,371 shares of Quest Diagnostics Incorporated (US:DGX) valued at $642,445 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 4,721 shares of Quest Diagnostics Incorporated. The current value of the position is $661,121 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-11-07 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 3,371 -1,350 -28.60 1 0.0645
2025-07-23 2025-06-30 13F QUEST DIAGNOSTICS COM 74834L100 4,721 1,846 64.21 1 0.0293
2025-05-14 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 2,875 0 0.00 0 0.0231
2025-02-14 2024-12-31 13F QUEST DIAGNOSTICS COM 74834L100 2,875 0 0.00 0 0.0190
2024-11-07 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 2,875 0 0.00 0 0.0196
2024-07-25 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 2,875 -1,086 -27.42 0 0.0179
2024-02-14 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 3,961 -202 -4.85 1 0.0252
2023-11-08 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 4,163 112 2.76 1 0.0209
2023-07-28 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 4,051 -5,256 -56.47 1 -100.00 0.0224
2023-05-15 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 9,307 -34 -0.36 1 0.00 0.0547
2023-02-07 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 9,341 -1,513 -13.94 1 -99.92 0.0640
2022-11-14 2022-09-30 13F QUEST DIAGNOSTICS COM 74834L100 10,854 -3,519 -24.48 1,332 -30.30 0.0519
2022-08-09 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 14,373 3,569 33.03 1,911 29.21 0.0565
2022-05-04 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 10,804 -1,448 -11.82 1,479 -30.24 0.0349
2022-02-09 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 12,252 5,807 90.10 2,120 126.25 0.0435
2021-11-04 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 6,445 -713 -9.96 937 -0.85 0.0210
2021-08-12 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 7,158 -1,427 -16.62 945 -14.25 0.0183
2021-05-10 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 8,585 -13,811 -61.67 1,102 -58.71 0.0220
2021-02-16 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 22,396 -7,714 -25.62 2,669 -22.57 0.0551
2020-11-13 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 30,110 12,373 69.76 3,447 70.56 0.0801
2020-08-10 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 17,737 -17,062 -49.03 2,021 -27.67 0.0504
2020-05-11 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 34,799 -797 -2.24 2,794 -26.49 0.0778
2020-02-13 2019-12-31 13F QUEST DIAGNOSTICS COM 74834L100 35,596 -2,496 -6.55 3,801 -6.77 0.0819
2019-11-12 2019-09-30 13F QUEST DIAGNOSTICS COM 74834L100 38,092 -4,354 -10.26 4,077 -5.65 0.0931
2019-08-12 2019-06-30 13F QUEST DIAGNOSTICS COM 74834L100 42,446 -12,407 -22.62 4,321 -12.39 0.0956
2019-05-09 2019-03-31 13F QUEST DIAGNOSTICS COM 74834L100 54,853 -1,384 -2.46 4,932 5.32 0.1087
2019-02-13 2018-12-31 13F QUEST DIAGNOSTICS COM 74834L100 56,237 1,931 3.56 4,683 -20.09 0.1167
2018-11-13 2018-09-30 13F QUEST DIAGNOSTICS COM 74834L100 54,306 899 1.68 5,860 -0.20 0.1157
2018-08-10 2018-06-30 13F QUEST DIAGNOSTICS COM 74834L100 53,407 -9,860 -15.58 5,872 -7.47 0.1204
2018-05-14 2018-03-31 13F QUEST DIAGNOSTICS COM 74834L100 63,267 0 0.00 6,346 1.85 0.1264
2018-02-09 2017-12-31 13F QUEST DIAGNOSTICS COM 74834L100 63,267 4,425 7.52 6,231 13.09 0.1237
2017-10-20 2017-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 58,842 -3,254 -5.24 5,510 -20.18 0.1225
2017-10-18 2017-09-30 13F QUEST DIAGNOSTICS COM 74834L100 229,189 167,093 13,907
2017-07-26 2017-06-30 13F QUEST DIAGNOSTICS COM 74834L100 62,096 516 0.84 6,903 14.16 0.1713
2017-04-26 2017-03-31 13F QUEST DIAGNOSTICS COM 74834L100 61,580 6,316 11.43 6,047 19.06 0.1544
2017-01-10 2016-12-31 13F QUEST DIAGNOSTICS COM 74834L100 55,264 -11,604 -17.35 5,079 -10.25 0.1373
2016-10-28 2016-09-30 13F QUEST DIAGNOSTICS COM 74834L100 66,868 5,220 8.47 5,659 12.75 0.1355
2016-07-25 2016-06-30 13F QUEST DIAGNOSTICS COM 74834L100 61,648 2,391 4.03 5,019 18.54 0.1164
2016-05-11 2016-03-31 13F QUEST DIAGNOSTICS COM 74834L100 59,257 -2,557 -4.14 4,234 -3.71 0.1014
2016-02-05 2015-12-31 13F QUEST DIAGNOSTICS COM 74834L100 61,814 -167,375 -73.03 4,397 -68.38 0.1038
2015-10-13 2015-09-30 13F QUEST DIAGNOSTICS COM 74834L100 229,189 113,228 97.64 13,907 65.38 0.2204
2015-07-30 2015-06-30 13F QUEST DIAGNOSTICS COM 74834L100 115,961 -24,812 -17.63 8,409 -22.27 0.1683
2015-05-07 2015-03-31 13F QUEST DIAGNOSTICS COM 74834L100 140,773 140,773 0.00 10,818 0.1884
2015-02-04 2014-12-31 13F QUEST DIAGNOSTICS COM 74834L100 0 -229,189 -100.00 0 -100.00
2014-10-24 2014-09-30 13F QUEST DIAGNOSTICS COM 74834L100 229,189 2,189 0.96 13,907 4.38 0.2159
2014-08-08 2014-06-30 13F QUEST DIAGNOSTICS COM 74834L100 227,000 -2,801 -1.22 13,323 0.10 0.2053
2014-05-07 2014-03-31 13F QUEST DIAGNOSTICS COM 74834L100 229,801 -390 -0.17 13,310 8.00 0.2212
2014-02-03 2013-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 230,191 153,656 200.77 12,324 160.60 0.2097
2014-01-27 2013-12-31 13F QUEST DIAGNOSTICS COM 74834L100 230,191 12,324
2013-10-28 2013-09-30 13F QUEST DIAGNOSTICS COM 74834L100 76,535 209 0.27 4,729 2.18 0.0869
2013-08-01 2013-06-30 13F QUEST DIAGNOSTICS COM 74834L100 76,326 76,326 4,628 0.0881
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.