Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionStephens Inc /ar/
Latest Disclosed Ownership272,906 shares
Latest Disclosed Value $ 33,205,025
Stephens Inc /ar/ reports 20.24% decrease in ownership of MRK / Merck & Co., Inc.

On April 28, 2026 - Stephens Inc /ar/ filed a 13F-HR form disclosing ownership of 272,906 shares of Merck & Co., Inc. (MX:MRK) valued at $33,205,025 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 342,140 shares of Merck & Co., Inc.. This represents a change in shares of -20.24% 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)
2026-04-28 2026-03-31 13F MERCK COM 58933Y105 272,906 -69,234 -20.24 33,205 -8.32 0.4154
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 342,140 27,257 8.66 36,218 36.83 0.4506
2025-10-27 2025-09-30 13F MERCK COM 58933Y105 314,883 7,094 2.30 26,469 8.64 0.3374
2025-07-29 2025-06-30 13F MERCK COM 58933Y105 307,789 -18,575 -5.69 24,365 -16.83 0.3348
2025-05-01 2025-03-31 13F MERCK COM 58933Y105 326,364 -123,265 -27.41 29,294 -34.51 0.4293
2025-01-28 2024-12-31 13F MERCK COM 58933Y105 449,629 -125,952 -21.88 44,729 -31.57 0.6271
2024-10-28 2024-09-30 13F MERCK COM 58933Y105 575,581 21,658 3.91 65,363 -4.68 0.9272
2024-08-06 2024-06-30 13F MERCK COM 58933Y105 553,923 7,473 1.37 68,576 -4.89 1.0461
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 546,450 13,465 2.53 72,104 24.09 1.1182
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 532,985 30,527 6.08 58,106 12.33 1.0023
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 502,458 -5,199 -1.02 51,728 -11.69 0.9916
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 507,657 14,623 2.97 58,578 11.68 1.0539
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 493,034 -17,481 -3.42 52,454 -7.39 1.0063
2023-02-14 2022-12-31 13F/A-1 MERCK COM 58933Y105 510,515 14,425 2.91 56,642 32.58 1.1605
2023-01-25 2022-12-31 13F MERCK OM 58933Y105 510,515 14,425 57 1.1605
2022-11-02 2022-09-30 13F MERCK OM 58933Y105 496,090 91,849 22.72 42,723 15.92 0.9123
2022-08-03 2022-06-30 13F MERCK OM 58933Y105 404,241 15,179 3.90 36,855 15.45 0.7436
2022-05-04 2022-03-31 13F MERCK OM 58933Y105 389,062 29,707 8.27 31,923 15.91 0.5205
2022-03-07 2021-12-31 13F MERCK OM 58933Y105 359,355 -97,394 -21.32 27,541 -19.72 0.4167
2021-10-27 2021-09-30 13F MERCK COM 58933Y105 456,749 14,542 3.29 34,306 -0.24 0.5307
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 442,207 50,114 12.78 34,390 13.78 0.5150
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 392,093 34,380 9.61 30,226 3.30 0.4963
2021-02-10 2020-12-31 13F MERCK & CO. COM 58933Y105 357,713 -16,312 -4.36 29,261 -5.69 0.5250
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 374,025 -966 -0.26 31,025 6.99 0.6107
2020-08-24 2020-06-30 13F MERCK & CO. COM 58933Y105 374,991 53,976 16.81 28,998 17.41 0.6234
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 321,015 58,831 22.44 24,699 3.58 0.6578
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 262,184 -2,290 -0.87 23,846 7.11 0.4996
2019-10-18 2019-09-30 13F MERCK COM 58933Y105 264,474 -15,604 -5.57 22,263 -5.20 0.4898
2019-08-01 2019-06-30 13F MERCK COM 58933Y105 280,078 2,042 0.73 23,485 1.56 0.5319
2019-05-03 2019-03-31 13F MERCK COM 58933Y105 278,036 4,181 1.53 23,124 10.51 0.5485
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 273,855 2,797 1.03 20,925 8.82 0.5937
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 271,058 5,884 2.22 19,229 19.46 0.4783
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 265,174 -100,322 -27.45 16,096 -19.15 0.4864
2018-05-03 2018-03-31 13F MERCK COM 58933Y105 365,496 9,526 2.68 19,909 -0.60 0.7424
2018-02-05 2017-12-31 13F MERCK COM 58933Y105 355,970 -1,796 -0.50 20,030 -12.56 0.7493
2017-11-08 2017-09-30 13F MERCK COM 58933Y105 357,766 -10,778 -2.92 22,908 -3.01 0.8274
2017-08-10 2017-06-30 13F MERCK COM 58933Y105 368,544 679 0.18 23,620 1.05 0.8104
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 367,865 23,811 6.92 23,374 15.40 0.8498
2017-02-09 2016-12-31 13F MERCK COM 58933Y105 344,054 -24,073 -6.54 20,254 -11.84 0.8257
2016-11-30 2016-09-30 13F/A-2 MERCK COM 58933Y105 368,127 -7,647 -2.03 22,975 6.13 1.0059
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 368,127 22,975
2016-08-05 2016-06-30 13F MERCK COM 58933Y105 375,774 48,185 14.71 21,648 24.89 0.9656
2016-05-05 2016-03-31 13F MERCK & CO INC COM 58933Y105 327,589 17,244 5.56 17,333 5.74 0.8483
2016-02-10 2015-12-31 13F MERCK & CO INC COM 58933Y105 310,345 6,111 2.01 16,392 9.09 0.8221
2015-11-03 2015-09-30 13F MERCK & CO INC COM 58933Y105 304,234 154 0.05 15,026 -13.20 0.7825
2015-07-29 2015-06-30 13F MERCK & CO INC COM 58933Y105 304,080 -6,590 -2.12 17,311 -3.06 0.7853
2015-05-06 2015-03-31 13F MERCK & CO INC COM 58933Y105 310,670 31,675 11.35 17,857 12.71 0.8135
2015-02-12 2014-12-31 13F MERCK & CO INC COM 58933Y105 278,995 9,730 3.61 15,844 -0.74 0.7498
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 269,265 34,043 14.47 15,962 17.30 0.7896
2014-08-15 2014-06-30 13F MERCK & CO INC COM 58933Y105 235,222 6,785 2.97 13,608 4.94 0.6854
2014-05-13 2014-03-31 13F MERCK & CO INC COM 58933Y105 228,437 15,748 7.40 12,968 21.82 0.7068
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 212,689 1,091 0.52 10,645 5.67 0.5282
2013-11-06 2013-09-30 13F MERCK & CO INC COM 58933Y105 211,598 -14,306 -6.33 10,074 -3.99 0.5429
2013-08-12 2013-06-30 13F MERCK & CO INC COM 58933Y105 225,904 225,904 10,493 0.5859
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.