Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership492,072 shares
Latest Disclosed Value $ 59,191,343
Oppenheimer Asset Management Inc. reports 2.15% decrease in ownership of MRK / Merck & Co., Inc.

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 492,072 shares of Merck & Co., Inc. (MX:MRK) valued at $59,191,343 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 502,885 shares of Merck & Co., Inc.. This represents a change in shares of -2.15% 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)
2026-04-23 2026-03-31 13F MERCK COM 58933Y105 492,072 -10,813 -2.15 59,191 11.82 0.1691
2026-02-02 2025-12-31 13F MERCK COM 58933Y105 502,885 -51,113 -9.23 52,934 13.84 0.1602
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 553,998 32,959 6.33 46,497 12.73 0.5114
2025-07-31 2025-06-30 13F MERCK COM 58933Y105 521,039 43,410 9.09 41,245 -3.79 0.4730
2025-04-23 2025-03-31 13F MERCK COM 58933Y105 477,629 -1,117 -0.23 42,872 -9.98 0.5320
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 478,746 53,953 12.70 47,626 -1.27 0.5789
2024-11-05 2024-09-30 13F MERCK COM 58933Y105 424,793 42,052 10.99 48,239 1.81 0.5807
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 382,741 55,085 16.81 47,383 9.60 0.6053
2024-05-07 2024-03-31 13F MERCK COM 58933Y105 327,656 -77,096 -19.05 43,234 -2.02 0.6335
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 404,752 -4,678 -1.14 44,126 4.69 0.6139
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 409,430 -17,857 -4.18 42,151 -14.51 0.6468
2023-08-03 2023-06-30 13F MERCK COM 58933Y105 427,287 -10,685 -2.44 49,305 5.81 0.7252
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 437,972 -5,757 -1.30 46,596 -5.35 0.7176
2023-02-07 2022-12-31 13F MERCK COM 58933Y105 443,729 -16,660 -3.62 49,232 24.16 0.7924
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 460,389 43,168 10.35 39,650 4.24 0.6994
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 417,221 8,089 1.98 38,037 13.31 0.6373
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 409,132 17,645 4.51 33,569 11.88 0.4765
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 391,487 12,227 3.22 30,004 5.32 0.3978
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 379,260 18,170 5.03 28,489 1.45 0.4051
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 361,090 42,193 13.23 28,082 14.21 0.3999
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 318,897 9,473 3.06 24,587 -2.86 0.3810
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 309,424 -21,450 -6.48 25,312 -7.78 0.4227
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 330,874 9,227 2.87 27,447 10.35 0.5329
2020-08-11 2020-06-30 13F MERCK & CO. COM 58933Y105 321,647 -20,262 -5.93 24,872 -5.45 0.5132
2020-05-08 2020-03-31 13F MERCK & CO. COM 58933Y105 341,909 30,660 9.85 26,306 -7.07 0.6463
2020-02-07 2019-12-31 13F MERCK COM 58933Y105 311,249 -51,220 -14.13 28,308 -7.22 0.5980
2019-10-31 2019-09-30 13F MERCK COM 58933Y105 362,469 -7,605 -2.05 30,511 -1.67 0.6778
2019-08-09 2019-06-30 13F MERCK COM 58933Y105 370,074 3,350 0.91 31,029 1.73 0.6856
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 366,724 -3,628 -0.98 30,500 7.78 0.6851
2019-01-30 2018-12-31 13F MERCK COM 58933Y105 370,352 17,065 4.83 28,299 12.92 0.7012
2018-10-26 2018-09-30 13F MERCK COM 58933Y105 353,287 674 0.19 25,062 17.10 0.5553
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 352,613 54,467 18.27 21,403 31.80 0.5235
2018-05-09 2018-03-31 13F MERCK COM 58933Y105 298,146 7,353 2.53 16,239 -12.78 0.4074
2018-02-07 2017-12-31 13F MERCK COM 58933Y105 290,793 0 0.00 18,619 0.00 0.4940
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 290,793 4,892 1.71 18,619 1.62 0.4837
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 285,901 -8,541 -2.90 18,322 -2.06 0.5062
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 294,442 294,442 18,708 0.5329
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.