Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionOppenheimer & Co Inc
Latest Disclosed Ownership38,731 shares
Latest Disclosed Value $ 7,590,501
Oppenheimer & Co Inc reports 2.37% increase in ownership of DGX / Quest Diagnostics Incorporated

On April 23, 2026 - Oppenheimer & Co Inc filed a 13F-HR form disclosing ownership of 38,731 shares of Quest Diagnostics Incorporated (US:DGX) valued at $7,590,501 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 37,834 shares of Quest Diagnostics Incorporated. This represents a change in shares of 2.37% during the quarter. The current value of the position is $7,501,033 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-23 2026-03-31 13F QUEST DIAGNOSTICS COM 74834L100 38,731 897 2.37 7,591 15.61 0.0924
2026-02-02 2025-12-31 13F QUEST DIAGNOSTICS COM 74834L100 37,834 65 0.17 6,565 -8.79 0.0932
2025-11-06 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 37,769 6 0.02 7,198 6.12 0.0878
2025-07-31 2025-06-30 13F QUEST DIAGNOSTICS COM 74834L100 37,763 72 0.19 6,783 6.37 0.0897
2025-04-23 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 37,691 -6,832 -15.34 6,377 -5.05 0.0963
2025-02-05 2024-12-31 13F QUEST DIAGNOSTICS COM 74834L100 44,523 -866 -1.91 6,717 -4.68 0.1002
2024-11-05 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 45,389 -2,933 -6.07 7,047 6.53 0.1075
2024-08-08 2024-06-30 13F QUEST DIAGNOSTICS COM 74834L100 48,322 -199 -0.41 6,614 2.42 0.1050
2024-05-07 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 48,521 -1,353 -2.71 6,459 -6.08 0.1071
2024-02-13 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 49,874 33 0.07 6,877 13.22 0.1264
2023-11-08 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 49,841 -456 -0.91 6,074 -14.09 0.1254
2023-08-03 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 50,297 -1,568 -3.02 7,070 -3.65 0.1414
2023-05-10 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 51,865 -5,263 -9.21 7,338 -17.90 0.1556
2023-02-08 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 57,128 -3,956 -6.48 8,937 19.26 0.2034
2022-11-14 2022-09-30 13F QUEST DIAGNOSTICS COM 74834L100 61,084 -1,659 -2.64 7,494 -10.18 0.1753
2022-08-08 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 62,743 2,166 3.58 8,343 0.63 0.1796
2022-05-12 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 60,577 3,792 6.68 8,291 -15.60 0.1494
2022-02-02 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 56,785 -59 -0.10 9,824 18.92 0.1718
2021-11-12 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 56,844 1,017 1.82 8,261 12.12 0.1546
2021-08-03 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 55,827 -376 -0.67 7,368 2.15 0.1321
2021-05-10 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 56,203 55 0.10 7,213 7.79 0.1439
2021-02-11 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 56,148 -227 -0.40 6,692 3.67 0.1412
2020-11-13 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 56,375 -153 -0.27 6,455 0.22 0.1615
2020-08-11 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 56,528 -207 -0.36 6,441 41.41 0.1666
2020-05-08 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 56,735 504 0.90 4,555 -24.15 0.1383
2020-02-07 2019-12-31 13F QUEST DIAGNOSTICS COM 74834L100 56,231 1,182 2.15 6,005 1.92 0.1487
2019-10-31 2019-09-30 13F QUEST DIAGNOSTICS COM 74834L100 55,049 478 0.88 5,892 6.05 0.1605
2019-08-09 2019-06-30 13F QUEST DIAGNOSTICS COM 74834L100 54,571 -660 -1.19 5,556 11.86 0.1510
2019-04-24 2019-03-31 13F QUEST DIAGNOSTICS COM 74834L100 55,231 945 1.74 4,967 9.87 0.1327
2019-01-29 2018-12-31 13F QUEST DIAGNOSTICS COM 74834L100 54,286 1,638 3.11 4,521 -20.42 0.1413
2018-10-26 2018-09-30 13F QUEST DIAGNOSTICS COM 74834L100 52,648 -443 -0.83 5,681 -2.67 0.1446
2018-08-10 2018-06-30 13F QUEST DIAGNOSTICS COM 74834L100 53,091 -6,397 -10.75 5,837 -2.20 0.1584
2018-05-01 2018-03-31 13F QUEST DIAGNOSTICS COM 74834L100 59,488 -92 -0.15 5,968 1.69 0.1533
2018-02-07 2017-12-31 13F QUEST DIAGNOSTICS COM 74834L100 59,580 708 1.20 5,869 6.48 0.1511
2017-11-09 2017-09-30 13F QUEST DIAGNOSTICS COM 74834L100 58,872 -215 -0.36 5,512 -16.08 0.1475
2017-08-09 2017-06-30 13F QUEST DIAGNOSTICS COM 74834L100 59,087 818 1.40 6,568 14.79 0.1811
2017-05-15 2017-03-31 13F QUEST DIAGNOSTICS COM 74834L100 58,269 -1,174 -1.98 5,722 4.74 0.1620
2017-02-01 2016-12-31 13F QUEST DIAGNOSTICS COM 74834L100 59,443 667 1.13 5,463 9.83 0.1590
2016-11-07 2016-09-30 13F QUEST DIAGNOSTICS COM 74834L100 58,776 1,835 3.22 4,974 7.31 0.1450
2016-08-08 2016-06-30 13F QUEST DIAGNOSTICS COM 74834L100 56,941 -4,377 -7.14 4,635 5.77 0.1382
2016-04-26 2016-03-31 13F QUEST DIAGNOSTICS COM 74834L100 61,318 6,087 11.02 4,382 11.53 0.1331
2016-02-03 2015-12-31 13F QUEST DIAGNOSTICS COM 74834L100 55,231 2,501 4.74 3,929 21.23 0.1169
2015-11-13 2015-09-30 13F QUEST DIAGNOSTICS COM 74834L100 52,730 1,510 2.95 3,241 -12.74 0.0985
2015-08-12 2015-06-30 13F QUEST DIAGNOSTICS COM 74834L100 51,220 41,591 431.93 3,714 401.89 0.1033
2015-05-08 2015-03-31 13F QUEST DIAGNOSTICS COM 74834L100 9,629 -594 -5.81 740 7.87 0.0201
2015-02-10 2014-12-31 13F QUEST DIAGNOSTICS COM 74834L100 10,223 6,372 165.46 686 193.16 0.0197
2014-11-12 2014-09-30 13F QUEST DIAGNOSTICS COM 74834L100 3,851 -3,750 -49.34 234 -47.53 0.0070
2014-08-14 2014-06-30 13F QUEST DIAGNOSTICS COM 74834L100 7,601 3,400 80.93 446 83.54 0.0134
2014-05-09 2014-03-31 13F QUEST DIAGNOSTICS COM 74834L100 4,201 4,201 -8.71 243 -12.90 0.0073
2013-11-01 2013-09-30 13F QUEST DIAGNOSTICS COM 74834L100 0 -4,602 -100.00 0 -100.00
2013-08-14 2013-06-30 13F QUEST DIAGNOSTICS COM 74834L100 4,602 4,602 279 0.0108
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.