Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership126,510 shares
Latest Disclosed Value $ 24,793,430
Mackenzie Financial Corp reports 20.66% increase in ownership of DGX / Quest Diagnostics Incorporated

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 126,510 shares of Quest Diagnostics Incorporated (US:DGX) valued at $24,793,430 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 104,846 shares of Quest Diagnostics Incorporated. This represents a change in shares of 20.66% during the quarter. The current value of the position is $24,811,141 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)
2026-05-13 2026-03-31 13F QUEST DIAGNOSTICS COM 74834L100 126,510 21,664 20.66 24,793 35.02 0.0297
2026-02-18 2025-12-31 13F QUEST DIAGNOSTICS COM 74834L100 104,846 -52,509 -33.37 18,363 -38.77 0.0217
2025-11-13 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 157,355 888 0.57 29,989 6.70 0.0363
2025-08-13 2025-06-30 13F QUEST DIAGNOSTICS COM 74834L100 156,467 143,935 1,148.54 28,106 1,225.75 0.0364
2025-05-07 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 12,532 1,530 13.91 2,120 27.79 0.0030
2025-05-02 2024-12-31 13F/A-2 QUEST DIAGNOSTICS COM 74834L100 11,002 1,518 16.01 1,660 12.70 0.0023
2025-02-20 2024-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 11,002 1,518 1,660 0.0022
2025-02-14 2024-12-31 13F Quest Diagnostics Common Stock 74834L100 11,002 1,518 664 0.0010
2024-11-13 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 9,484 -661 -6.52 1,472 6.05 0.0020
2024-08-14 2024-06-30 13F QUEST DIAGNOSTICS COM 74834L100 10,145 -8,826 -46.52 1,389 -45.03 0.0021
2024-05-10 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 18,971 840 4.63 2,525 1.04 0.0036
2024-01-30 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 18,131 -17,962 -49.77 2,500 -42.79 0.0038
2023-10-25 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 36,093 19,142 112.93 4,368 85.24 0.0073
2023-08-03 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 16,951 -4,066 -19.35 2,359 -20.69 0.0036
2023-04-24 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 21,017 -2,227 -9.58 2,973 -18.23 0.0046
2023-02-14 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 23,244 -29,055 -55.56 3,636 -43.34 0.0061
2022-10-07 2022-09-30 13F Quest Diagnostics Common Stock 74834L100 52,299 -6,766 -11.46 6,417 -18.30 0.0110
2022-08-10 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 59,065 21,079 55.49 7,854 51.07 0.0126
2022-05-13 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 37,986 -25,568 -40.23 5,199 -52.71 0.0070
2022-02-14 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 63,554 423 0.67 10,995 19.85 0.0148
2021-11-08 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 63,131 23,050 57.51 9,174 73.45 0.0130
2021-08-11 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 40,081 -19,651 -32.90 5,289 -31.01 0.0074
2021-05-14 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 59,732 40,652 213.06 7,666 237.12 0.0117
2021-02-10 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 19,080 -4,970 -20.67 2,274 -17.40 0.0049
2020-11-13 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 24,050 9,716 67.78 2,753 68.48 0.0068
2020-08-13 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 14,334 10,632 287.20 1,634 450.17 0.0044
2020-05-14 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 3,702 391 11.81 297 -16.10 0.0010
2020-02-13 2019-12-31 13F QUEST DIAGNOSTICS COM 74834L100 3,311 1,341 68.07 354 67.77 0.0009
2019-11-14 2019-09-30 13F QUEST DIAGNOSTICS COM 74834L100 1,970 -11 -0.56 211 4.46 0.0006
2019-08-23 2019-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 1,981 -353 -15.12 202 -3.81 0.0005
2019-08-14 2019-06-30 13F QUEST DIAGNOSTICS COM 74834L100 1,981 -353 202
2019-05-15 2019-03-31 13F QUEST DIAGNOSTICS COM 74834L100 2,334 -52,594 -95.75 210 -95.41 0.0005
2019-02-06 2018-12-31 13F QUEST DIAGNOSTICS COM 74834L100 54,928 -18,873 -25.57 4,574 -42.57 0.0120
2018-11-15 2018-09-30 13F QUEST DIAGNOSTICS COM 74834L100 73,801 6,144 9.08 7,964 7.07 0.0194
2018-08-13 2018-06-30 13F QUEST DIAGNOSTICS COM 74834L100 67,657 -106,115 -61.07 7,438 -57.32 0.0190
2018-05-14 2018-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 173,772 -84,233 -32.65 17,429 -31.41 0.0444
2018-05-14 2018-03-31 13F QUEST DIAGNOSTICS COM 74834L100 173,772 17,429
2018-02-13 2017-12-31 13F QUEST DIAGNOSTICS COM 74834L100 258,005 62,505 31.97 25,411 38.80 0.0613
2017-11-13 2017-09-30 13F QUEST DIAGNOSTICS COM 74834L100 195,500 40,164 25.86 18,307 6.02 0.0987
2017-08-14 2017-06-30 13F QUEST DIAGNOSTICS COM 74834L100 155,336 -49,238 -24.07 17,267 -14.04 0.0961
2017-05-25 2017-03-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 204,574 94,011 85.03 20,087 97.69 0.1175
2017-05-12 2017-03-31 13F QUEST DIAGNOSTICS COM 74834L100 204,574 20,087
2017-02-14 2016-12-31 13F QUEST DIAGNOSTICS COM 74834L100 110,563 -46,690 -29.69 10,161 -23.65 0.0609
2016-11-15 2016-09-30 13F QUEST DIAGNOSTICS COM 74834L100 157,253 -2,699 -1.69 13,308 2.20 0.0831
2016-08-12 2016-06-30 13F QUEST DIAGNOSTICS COM 74834L100 159,952 -1,318 -0.82 13,022 13.01 0.0736
2016-05-12 2016-03-31 13F QUEST DIAGNOSTICS COM 74834L100 161,270 12,013 8.05 11,523 8.52 0.1045
2016-02-12 2015-12-31 13F QUEST DIAGNOSTICS COM 74834L100 149,257 137,240 1,142.05 10,618 1,336.81 0.0659
2015-11-13 2015-09-30 13F QUEST DIAGNOSTICS COM 74834L100 12,017 1,571 15.04 739 -2.51 0.0045
2015-08-13 2015-06-30 13F QUEST DIAGNOSTICS COM 74834L100 10,446 954 10.05 758 3.98 0.0041
2015-05-13 2015-03-31 13F QUEST DIAGNOSTICS COM 74834L100 9,492 306 3.33 729 18.34 0.0038
2015-02-11 2014-12-31 13F QUEST DIAGNOSTICS COM 74834L100 9,186 580 6.74 616 18.01 0.0031
2014-11-12 2014-09-30 13F QUEST DIAGNOSTICS COM 74834L100 8,606 -836 -8.85 522 -5.78 0.0026
2014-08-11 2014-06-30 13F QUEST DIAGNOSTICS COM 74834L100 9,442 3,846 68.73 554 70.99 0.0026
2014-05-14 2014-03-31 13F QUEST DIAGNOSTICS COM 74834L100 5,596 5,596 324 0.0016
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.