Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionJustInvest LLC
Latest Disclosed Ownership409,858 shares
Latest Disclosed Value $ 49,301,819
JustInvest LLC reports 6.21% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - JustInvest LLC filed a 13F-HR form disclosing ownership of 409,858 shares of Merck & Co., Inc. (MX:MRK) valued at $49,301,819 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 385,886 shares of Merck & Co., Inc.. This represents a change in shares of 6.21% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 409,858 23,972 6.21 49,302 21.38 0.4839
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 385,886 66,115 20.68 40,618 51.27 0.3963
2025-10-31 2025-09-30 13F MERCK COM 58933Y105 319,771 -2,859 -0.89 26,853 5.09 0.2750
2025-07-25 2025-06-30 13F MERCK COM 58933Y105 322,630 26,484 8.94 25,552 -3.87 0.2884
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 296,146 2,902 0.99 26,582 -8.88 0.3920
2025-02-10 2024-12-31 13F MERCK COM 58933Y105 293,244 25,668 9.59 29,172 -4.00 0.4406
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 267,576 -6,802 -2.48 30,386 -9.17 0.4893
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 274,378 39,034 16.59 33,453 7.73 0.6369
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 235,344 19,246 8.91 31,054 31.82 0.6665
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 216,098 7,330 3.51 23,559 9.61 0.6113
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 208,768 10,523 5.31 21,493 -6.05 0.6425
2023-07-28 2023-06-30 13F MERCK COM 58933Y105 198,245 15,153 8.28 22,876 17.44 0.7008
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 183,092 29,878 19.50 19,479 14.58 0.6765
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 153,214 11,940 8.45 16,999 39.71 0.7015
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 141,274 14,820 11.72 12,167 5.53 0.5502
2022-08-12 2022-06-30 13F/A-1 MERCK COM 58933Y105 126,454 34,762 37.91 11,529 53.27 0.5340
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 126,454 34,762 11,529 0.5340
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 91,692 28,961 46.17 7,522 56.45 0.3641
2022-02-23 2021-12-31 13F MERCK COM 58933Y105 62,731 18,364 41.39 4,808 44.30 0.2834
2021-11-09 2021-09-30 13F MERCK COM 58933Y105 44,367 3,273 7.96 3,332 4.26 0.2994
2021-08-11 2021-06-30 13F/A-1 MERCK COM 58933Y105 41,094 9,771 31.19 3,196 32.34 0.3346
2021-07-21 2021-06-30 13F MERCK COM 58933Y105 31,323 0 2,415 0.3676
2021-04-28 2021-03-31 13F MERCK & CO. COM 58933Y105 31,323 1,425 4.77 2,415 -1.27 0.3656
2021-01-20 2020-12-31 13F/A-1 MERCK & CO. COM 58933Y105 29,898 1,515 5.34 2,446 3.91 0.5321
2021-01-19 2020-12-31 13F MERCK & CO. COM 58933Y105 29,898 1,515 2 5,838.7342
2020-10-26 2020-09-30 13F MERCK & CO. COM 58933Y105 28,383 8,054 39.62 2,354 49.75 0.6605
2020-07-27 2020-06-30 13F MERCK & CO. COM 58933Y105 20,329 1,338 7.05 1,572 7.60 0.7130
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 18,991 18,991 1,461 0.8519
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.