奎斯特診斷公司
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionMorgan Stanley
Latest Disclosed Ownership2,479,720 shares
Latest Disclosed Value $ 485,976,070
Morgan Stanley reports 7.94% decrease in ownership of DGX / Quest Diagnostics Incorporated

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 2,479,720 shares of Quest Diagnostics Incorporated (US:DGX) valued at $485,975,526 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 2,693,568 shares of Quest Diagnostics Incorporated. This represents a change in shares of -7.94% during the quarter. The current value of the position is $496,663,119 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)
2026-05-15 2026-03-31 13F QUEST DIAGNOSTICS COM 74834L100 2,479,720 -213,848 -7.94 485,976 3.97 0.0293
2026-05-27 2025-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 2,693,568 406,658 17.78 467,415 7.24 0.0279
2026-02-13 2025-12-31 13F QUEST DIAGNOSTICS COM 74834L100 2,693,568 406,658 467,415 0.0279
2026-05-27 2025-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 2,286,910 141,806 6.61 435,840 13.11 0.0264
2025-11-14 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 2,286,910 141,806 435,840 0.0264
2025-08-15 2025-06-30 13F QUEST DIAGNOSTICS COM 74834L100 2,145,104 359,986 20.17 385,326 27.57 0.0251
2025-05-15 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 1,785,118 143,864 8.77 302,042 21.99 0.0216
2025-05-15 2024-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,641,254 -74,883 -4.36 247,600 -7.07 0.0173
2025-02-14 2024-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,641,254 -74,883 247,600 0.0173
2025-05-14 2024-09-30 13F/A-2 QUEST DIAGNOSTICS COM 74834L100 1,716,137 -173,621 -9.19 266,431 3.00 0.0193
2025-02-14 2024-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,716,137 -173,621 266,431 0.0193
2024-11-14 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,716,137 -173,621 266,431 0.0193
2025-05-14 2024-06-30 13F/A-2 QUEST DIAGNOSTICS COM 74834L100 1,889,758 38,337 2.07 258,671 4.96 0.0200
2024-10-17 2024-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,889,758 38,337 258,671 0.0200
2024-08-14 2024-06-30 13F QUEST DIAGNOSTICS COM 74834L100 1,889,758 38,337 258,671 0.0200
2024-10-17 2024-03-31 13F/A-2 QUEST DIAGNOSTICS COM 74834L100 1,851,421 -14,720 -0.79 246,443 -4.22 0.0198
2024-08-16 2024-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,851,421 -14,720 246,443 0.0023
2024-05-15 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 1,851,421 -14,720 246,443 0.0198
2024-08-16 2023-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,866,141 232,556 14.24 257,304 29.25 0.0227
2024-02-13 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,866,141 232,556 257,304 0.0227
2023-11-15 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,633,585 -129,490 -7.34 199,069 -19.67 0.0202
2023-08-14 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 1,763,075 -19,952 -1.12 247,818 -1.76 0.0244
2023-05-15 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 1,783,027 -108,465 -5.73 252,263 -14.75 0.0270
2023-02-14 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,891,492 -59,731 -3.06 295,905 23.60 0.0336
2022-11-14 2022-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,951,223 44,704 2.34 239,396 -5.57 0.0326
2022-10-27 2022-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,906,519 417,110 28.01 253,527 24.37 0.0329
2022-08-15 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 1,906,519 417,110 253,527 0.0329
2022-10-27 2022-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,489,409 180,695 13.81 203,842 -9.97 0.0275
2022-05-13 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 1,489,409 180,695 203,842 0.0275
2022-02-14 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,308,714 -71,579 -5.19 226,421 12.89 0.0280
2021-11-15 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,380,293 -676,031 -32.88 200,571 -26.09 0.0270
2021-08-23 2021-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 2,056,324 567,239 38.09 271,372 42.00 0.0358
2021-08-16 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 2,056,324 567,239 271,372 0.0074
2021-05-17 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 1,489,085 -134,032 -8.26 191,109 -1.20 0.0281
2021-02-16 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,623,117 321,038 24.66 193,427 29.75 0.0299
2020-11-13 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,302,079 260,632 25.03 149,075 25.61 0.0288
2020-08-14 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 1,041,447 119,929 13.01 118,682 60.38 0.0263
2020-05-26 2020-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 921,518 92,735 11.19 73,999 -16.39 0.0201
2020-05-15 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 921,518 92,735 73,999 5,684.6658
2020-02-14 2019-12-31 13F QUEST DIAGNOSTICS COM 74834L100 828,783 289,244 53.61 88,505 53.26 0.0206
2019-11-14 2019-09-30 13F QUEST DIAGNOSTICS COM 74834L100 539,539 131,473 32.22 57,747 38.99 0.0153
2019-08-14 2019-06-30 13F QUEST DIAGNOSTICS COM 74834L100 408,066 16,950 4.33 41,547 18.14 0.0111
2019-05-15 2019-03-31 13F QUEST DIAGNOSTICS COM 74834L100 391,116 12,526 3.31 35,168 11.56 0.0100
2019-02-14 2018-12-31 13F QUEST DIAGNOSTICS COM 74834L100 378,590 -238,911 -38.69 31,525 -52.69 0.0094
2019-04-23 2018-09-30 13F/A-2 QUEST DIAGNOSTICS COM 74834L100 617,501 301,621 95.49 66,633 91.88 0.0167
2018-11-20 2018-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 617,501 0 66,633 0.0167
2018-11-14 2018-09-30 13F QUEST DIAGNOSTICS COM 74834L100 617,501 301,621 66,633
2019-04-23 2018-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 315,880 -295,978 -48.37 34,727 -43.41 0.0094
2018-08-14 2018-06-30 13F QUEST DIAGNOSTICS COM 74834L100 315,880 -295,978 34,727
2019-04-23 2018-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 611,858 -557,036 -47.65 61,369 -46.69 0.0170
2018-05-14 2018-03-31 13F QUEST DIAGNOSTICS COM 74834L100 611,858 -557,036 61,369
2019-04-23 2017-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,168,894 -400,941 -25.54 115,124 -21.68 0.0315
2018-02-14 2017-12-31 13F QUEST DIAGNOSTICS COM 74834L100 1,168,894 -400,941 115,124
2017-11-14 2017-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,569,835 1,224,450 354.52 146,999 282.88 0.0440
2017-08-11 2017-06-30 13F QUEST DIAGNOSTICS COM 74834L100 345,385 -59,137 -14.62 38,393 -3.34 0.0116
2017-05-22 2017-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 404,522 107,330 36.11 39,720 45.43 0.0122
2017-05-12 2017-03-31 13F QUEST DIAGNOSTICS COM 74834L100 404,522 39,720
2017-02-22 2016-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 297,192 -4,162 -1.38 27,313 7.09 0.0089
2017-02-13 2016-12-31 13F QUEST DIAGNOSTICS COM 74834L100 297,192 27,313
2016-11-10 2016-09-30 13F QUEST DIAGNOSTICS COM 74834L100 301,354 -34,220 -10.20 25,505 -6.64 0.0087
2016-08-12 2016-06-30 13F QUEST DIAGNOSTICS COM 74834L100 335,574 70,282 26.49 27,320 44.12 0.0099
2016-05-12 2016-03-31 13F QUEST DIAGNOSTICS COM 74834L100 265,292 16,324 6.56 18,956 7.02 0.0073
2016-02-09 2015-12-31 13F QUEST DIAGNOSTICS COM 74834L100 248,968 -297,610 -54.45 17,712 -47.28 0.0064
2016-02-08 2015-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 546,578 -80,192 -12.79 33,599 -26.08 0.0124
2015-11-09 2015-09-30 13F QUEST DIAGNOSTICS COM 74834L100 546,578 33,599
2015-08-12 2015-06-30 13F QUEST DIAGNOSTICS COM 74834L100 626,770 229,508 57.77 45,453 48.88 0.0158
2015-05-14 2015-03-31 13F QUEST DIAGNOSTICS COM 74834L100 397,262 92,398 30.31 30,529 49.32 0.0112
2015-02-13 2014-12-31 13F QUEST DIAGNOSTICS COM 74834L100 304,864 -44,637 -12.77 20,446 -3.59 0.0075
2014-12-16 2014-09-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 349,501 74,999 27.32 21,208 33.40 0.0082
2014-11-14 2014-09-30 13F QUEST DIAGNOSTICS COM 74834L100 349,501 21,208
2014-05-13 2014-03-31 13F QUEST DIAGNOSTICS COM 74834L100 274,502 -387,329 -58.52 15,898 -55.13 0.0067
2014-02-13 2013-12-31 13F QUEST DIAGNOSTICS COM 74834L100 661,831 292,186 79.05 35,435 55.14 0.0151
2013-11-13 2013-09-30 13F QUEST DIAGNOSTICS COM 74834L100 369,645 64,670 21.21 22,840 23.51 0.0108
2013-08-08 2013-06-30 13F QUEST DIAGNOSTICS COM 74834L100 304,975 304,975 18,492 0.0093
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.