Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership108,671 shares
Latest Disclosed Value $ 21,297,343
Standard Life Aberdeen plc reports 3.61% increase in ownership of DGX / Quest Diagnostics Incorporated

On April 29, 2026 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 108,671 shares of Quest Diagnostics Incorporated (US:DGX) valued at $21,297,343 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 104,886 shares of Quest Diagnostics Incorporated. This represents a change in shares of 3.61% during the quarter. The current value of the position is $21,765,715 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)
2026-04-29 2026-03-31 13F QUEST DIAGNOSTICS COM 74834L100 108,671 3,785 3.61 21,297 17.02 0.0187
2026-01-16 2025-12-31 13F QUEST DIAGNOSTICS COM 74834L100 104,886 -775 -0.73 18,201 -8.79 0.0282
2025-11-07 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 105,661 1,354 1.30 19,953 6.50 0.0316
2025-07-24 2025-06-30 13F QUEST DIAGNOSTICS COM 74834L100 104,307 15,223 17.09 18,737 24.63 0.0319
2025-05-13 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 89,084 -345,097 -79.48 15,034 -77.12 0.0293
2025-01-24 2024-12-31 13F QUEST DIAGNOSTICS COM 74834L100 434,181 -27,706 -6.00 65,718 -8.09 0.1234
2024-10-25 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 461,887 13,938 3.11 71,500 16.61 0.1311
2024-08-09 2024-06-30 13F QUEST DIAGNOSTICS COM 74834L100 447,949 19,496 4.55 61,315 7.51 0.1175
2024-05-09 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 428,453 27,109 6.75 57,031 3.06 0.1118
2024-01-31 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 401,344 46,288 13.04 55,337 27.90 0.1200
2023-11-07 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 355,056 25,495 7.74 43,267 -6.60 0.1104
2024-06-20 2023-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 329,561 23,488 7.67 46,323 6.97 0.1078
2023-08-04 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 329,561 23,488 46,323 0.1078
2024-06-20 2023-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 306,073 50,810 19.90 43,303 8.44 0.1084
2023-04-28 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 306,073 50,810 43,303 0.1084
2024-06-20 2022-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 255,263 98,199 62.52 39,933 107.23 0.1086
2023-02-10 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 255,263 98,199 39,933 0.1086
2022-11-10 2022-09-30 13F QUEST DIAGNOSTICS COM 74834L100 157,064 76,467 94.88 19,270 78.18 0.0574
2022-08-05 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 80,597 10,529 15.03 10,815 10.98 0.0340
2022-05-04 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 70,068 -8,514 -10.83 9,745 -28.32 0.0249
2022-02-10 2021-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 78,582 -6,199 -7.31 13,596 9.56 0.0299
2022-02-08 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 78,582 -6,199 13,596 0.0098
2021-11-15 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 84,781 4,893 6.12 12,410 17.71 0.0280
2021-08-10 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 79,888 -2,969 -3.58 10,543 -0.89 0.0231
2021-05-06 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 82,857 15,845 23.65 10,638 33.21 0.0242
2021-02-10 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 67,012 6,548 10.83 7,986 15.35 0.0195
2020-10-21 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 60,464 -6,712 -9.99 6,923 -9.62 0.0185
2020-08-10 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 67,176 -4,414 -6.17 7,660 33.24 0.0207
2020-05-13 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 71,590 -3,319 -4.43 5,749 -28.13 0.0183
2020-02-18 2019-12-31 13F QUEST DIAGNOSTICS COM 74834L100 74,909 -1,896 -2.47 7,999 -2.70 0.0193
2019-11-13 2019-09-30 13F QUEST DIAGNOSTICS COM 74834L100 76,805 -1,846 -2.35 8,221 2.66 0.0205
2019-08-13 2019-06-30 13F QUEST DIAGNOSTICS COM 74834L100 78,651 -1,190 -1.49 8,008 11.55 0.0178
2019-05-14 2019-03-31 13F QUEST DIAGNOSTICS COM 74834L100 79,841 20,435 34.40 7,179 46.48 0.0156
2019-02-12 2018-12-31 13F QUEST DIAGNOSTICS COM 74834L100 59,406 -395 -0.66 4,901 -24.05 0.0116
2018-11-20 2018-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 59,801 3,435 6.09 6,453 4.11 0.0120
2018-11-13 2018-09-30 13F QUEST DIAGNOSTICS COM 74834L100 59,801 3,435 6,453
2018-08-09 2018-06-30 13F QUEST DIAGNOSTICS COM 74834L100 56,366 7,909 16.32 6,198 27.53 0.0119
2018-05-15 2018-03-31 13F QUEST DIAGNOSTICS COM 74834L100 48,457 -7,319 -13.12 4,860 -11.52 0.0096
2018-02-12 2017-12-31 13F QUEST DIAGNOSTICS COM 74834L100 55,776 -86,449 -60.78 5,493 -58.76 0.0105
2017-11-14 2017-09-30 13F QUEST DIAGNOSTICS COM 74834L100 142,225 142,225 13,318 0.0243
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.