Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionDiligent Investors, LLC
Latest Disclosed Ownership11,463 shares
Latest Disclosed Value $ 1,378,930
Diligent Investors, LLC reports 0.01% decrease in ownership of MRK / Merck & Co., Inc.

On April 15, 2026 - Diligent Investors, LLC filed a 13F-HR form disclosing ownership of 11,463 shares of Merck & Co., Inc. (MX:MRK) valued at $1,378,930 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 11,464 shares of Merck & Co., Inc.. This represents a change in shares of -0.01% during the quarter.

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)
2026-04-15 2026-03-31 13F MERCK COM 58933Y105 11,463 -1 -0.01 1,379 14.26 0.3416
2026-01-23 2025-12-31 13F MERCK COM 58933Y105 11,464 -350 -2.96 1,207 21.70 0.2968
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 11,814 -5,091 -30.12 992 -25.93 0.2506
2025-07-22 2025-06-30 13F MERCK COM 58933Y105 16,905 -370 -2.14 1,338 -13.68 0.3170
2025-04-10 2025-03-31 13F MERCK COM 58933Y105 17,275 -245 -1.40 1,551 -11.02 0.3773
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 17,520 252 1.46 1,743 -11.12 0.3997
2024-11-01 2024-09-30 13F MERCK COM 58933Y105 17,268 -567 -3.18 1,961 -11.19 0.4550
2024-07-15 2024-06-30 13F MERCK COM 58933Y105 17,835 3 0.02 2,208 -6.16 0.5468
2024-05-06 2024-03-31 13F MERCK COM 58933Y105 17,832 3 0.02 2,353 21.05 0.5902
2024-01-10 2023-12-31 13F MERCK COM 58933Y105 17,829 53 0.30 1,944 6.17 0.5341
2023-11-06 2023-09-30 13F MERCK COM 58933Y105 17,776 -397 -2.18 1,830 -12.69 0.5589
2023-07-24 2023-06-30 13F MERCK COM 58933Y105 18,173 -372 -2.01 2,097 6.29 0.6198
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 18,545 5 0.03 1,973 -4.09 0.6091
2023-01-20 2022-12-31 13F MERCK COM 58933Y105 18,540 156 0.85 2,057 29.88 0.6716
2022-10-14 2022-09-30 13F MERCK COM 58933Y105 18,384 4,833 35.67 1,583 28.18 0.5646
2022-07-13 2022-06-30 13F MERCK COM 58933Y105 13,551 6 0.04 1,235 11.16 0.4226
2022-04-26 2022-03-31 13F MERCK COM 58933Y105 13,545 -53 -0.39 1,111 6.62 0.3224
2022-01-21 2021-12-31 13F MERCK COM 58933Y105 13,598 -323 -2.32 1,042 -3.79 0.2914
2021-10-13 2021-09-30 13F MERCK COM 58933Y105 13,921 0 0.00 1,083 0.00 0.3683
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 13,921 -1,279 -8.41 1,083 -7.59 0.3677
2021-04-23 2021-03-31 13F MERCK & CO. COM 58933Y105 15,200 841 5.86 1,172 -0.26 0.4275
2021-02-09 2020-12-31 13F MERCK & CO. COM 58933Y105 14,359 -362 -2.46 1,175 -3.77 0.4719
2020-11-09 2020-09-30 13F MERCK & CO. COM 58933Y105 14,721 4 0.03 1,221 7.29 0.5571
2020-07-09 2020-06-30 13F MERCK & CO. COM 58933Y105 14,717 -536 -3.51 1,138 -3.07 0.5575
2020-04-29 2020-03-31 13F MERCK & CO. COM 58933Y105 15,253 -2,272 -12.96 1,174 -26.35 0.7023
2020-01-13 2019-12-31 13F MERCK COM 58933Y105 17,525 152 0.87 1,594 9.03 0.7208
2019-10-22 2019-09-30 13F MERCK COM 58933Y105 17,373 -291 -1.65 1,462 -1.28 0.7142
2019-08-01 2019-06-30 13F MERCK COM 58933Y105 17,664 62 0.35 1,481 1.16 0.7362
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 17,602 -637 -3.49 1,464 5.02 0.8341
2019-01-17 2018-12-31 13F MERCK COM 58933Y105 18,239 -9,128 -33.35 1,394 -28.18 0.9144
2018-10-25 2018-09-30 13F MERCK COM 58933Y105 27,367 3 0.01 1,941 16.86 1.0654
2018-07-23 2018-06-30 13F MERCK COM 58933Y105 27,364 -663 -2.37 1,661 8.78 1.0112
2018-04-23 2018-03-31 13F MERCK COM 58933Y105 28,027 18 0.06 1,527 -3.11 0.9195
2018-02-12 2017-12-31 13F MERCK COM 58933Y105 28,009 300 1.08 1,576 -11.16 1.0042
2017-11-09 2017-09-30 13F MERCK COM 58933Y105 27,709 -719 -2.53 1,774 -2.63 1.2961
2017-08-11 2017-06-30 13F MERCK COM 58933Y105 28,428 -622 -2.14 1,822 -1.19 1.2923
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 29,050 -163 -0.56 1,844 7.21 1.4105
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 29,213 -357 -1.21 1,720 -6.93 1.3651
2016-10-31 2016-09-30 13F MERCK COM 58933Y105 29,570 -16 -0.05 1,848 8.45 1.4971
2016-07-28 2016-06-30 13F MERCK COM 58933Y105 29,586 -1,014 -3.31 1,704 5.25 1.6197
2016-05-09 2016-03-31 13F MERCK & CO INC COM 58933Y105 30,600 -496 -1.60 1,619 -1.46 1.7665
2016-02-02 2015-12-31 13F MERCK & CO INC COM 58933Y105 31,096 0 0.00 1,643 0.49 1.8540
2015-11-04 2015-09-30 13F MERCK & CO INC COM 58933Y105 31,096 -48 -0.15 1,635 -9.42 1.7540
2015-07-28 2015-06-30 13F MERCK & CO INC COM 58933Y105 31,144 -898 -2.80 1,805 -5.99 1.8895
2015-05-13 2015-03-31 13F MERCK & CO INC COM 58933Y105 32,042 -498 -1.53 1,920 0.37 1.9704
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 32,540 32,540 1,913 1.9492
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.