Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionClean Yield Group
Latest Disclosed Ownership26,322 shares
Latest Disclosed Value $ 5,158,586
Clean Yield Group reports 1.35% decrease in ownership of DGX / Quest Diagnostics Incorporated

On April 14, 2026 - Clean Yield Group filed a 13F-HR form disclosing ownership of 26,322 shares of Quest Diagnostics Incorporated (US:DGX) valued at $5,158,586 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 26,681 shares of Quest Diagnostics Incorporated. This represents a change in shares of -1.35% during the quarter. The current value of the position is $5,097,782 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)
2026-04-14 2026-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 26,322 -359 -1.35 5,159 11.43 1.4522
2026-01-26 2025-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 26,681 24 0.09 4,630 -8.88 1.2852
2025-10-23 2025-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 26,657 111 0.42 5,080 6.54 1.4359
2025-07-17 2025-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 26,546 -1,078 -3.90 4,768 2.03 1.4264
2025-04-14 2025-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 27,624 1,196 4.53 4,674 17.24 1.5228
2025-01-13 2024-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 26,428 3,983 17.75 3,987 14.41 1.2681
2024-10-07 2024-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 22,445 3,325 17.39 3,485 33.13 1.1041
2024-07-10 2024-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 19,120 11 0.06 2,617 2.91 0.9776
2024-05-29 2024-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 19,109 3,308 20.94 2,544 16.76 0.9895
2024-01-24 2023-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,801 475 3.10 2,179 15.85 0.9176
2023-10-12 2023-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,326 -50 -0.33 1,881 -13.00 0.8338
2023-07-26 2023-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,376 -95 -0.61 2,161 -1.23 0.8902
2023-04-26 2023-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,471 149 0.97 2,189 -8.68 0.9323
2023-01-31 2022-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,322 77 0.51 2,397 28.13 1.0296
2022-10-31 2022-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 15,245 327 2.19 1,870 -5.75 0.8678
2022-07-18 2022-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 14,918 -1,383 -8.48 1,984 -11.07 0.8201
2022-04-25 2022-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 16,301 -985 -5.70 2,231 -25.41 0.7879
2022-01-24 2021-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 17,286 -1,383 -7.41 2,991 10.25 0.9559
2021-10-27 2021-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 18,669 -2,362 -11.23 2,713 -2.27 0.8899
2021-07-26 2021-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 21,031 -1,105 -4.99 2,776 -2.29 0.9434
2021-04-26 2021-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 22,136 244 1.11 2,841 8.89 1.0687
2021-01-26 2020-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 21,892 -135 -0.61 2,609 3.45 0.9378
2020-10-16 2020-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 22,027 -207 -0.93 2,522 -0.47 1.0226
2020-07-22 2020-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 22,234 -855 -3.70 2,534 36.68 1.0950
2020-04-20 2020-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 23,089 18,244 376.55 1,854 258.61 0.8806
2020-01-17 2019-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 4,845 -600 -11.02 517 -11.32 0.1620
2019-10-23 2019-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 5,445 0 0.00 583 5.23 0.1923
2019-07-22 2019-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 5,445 20 0.37 554 13.52 0.2002
2019-04-24 2019-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 5,425 -90 -1.63 488 6.32 0.1976
2019-01-23 2018-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 5,515 -460 -7.70 459 -28.84 0.1998
2018-10-22 2018-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 5,975 -465 -7.22 645 -8.77 0.2567
2018-07-24 2018-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,440 255 4.12 707 14.03 0.2928
2018-04-23 2018-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,185 -275 -4.26 620 -2.52 0.2618
2018-01-16 2017-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,460 185 2.95 636 8.16 0.2518
2017-10-11 2017-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,275 -160 -2.49 588 -16.24 0.2399
2017-07-17 2017-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,435 -100 -1.53 702 9.35 0.2937
2017-05-03 2017-03-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,535 0 0.00 642 6.82 0.2705
2017-01-24 2016-12-31 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,535 0 0.00 601 8.68 0.2711
2016-10-28 2016-09-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,535 -65 -0.98 553 2.98 0.2404
2016-07-27 2016-06-30 13F QUEST DIAGNOSTICS INC COM Stock 74834L100 6,600 6,600 537 0.2305
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.