Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionOppenheimer & Co Inc
Latest Disclosed Ownership184,185 shares
Latest Disclosed Value $ 22,155,614
Oppenheimer & Co Inc reports 11.99% increase in ownership of 6MK / Merck & Co., Inc.

On April 23, 2026 - Oppenheimer & Co Inc filed a 13F-HR form disclosing ownership of 184,185 shares of Merck & Co., Inc. (BG:6MK) valued at $22,155,614 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 164,462 shares of Merck & Co., Inc.. This represents a change in shares of 11.99% 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 184,185 19,723 11.99 22,156 27.98 0.2698
2026-02-02 2025-12-31 13F MERCK COM 58933Y105 164,462 3,198 1.98 17,311 27.91 0.2458
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 161,264 -4,674 -2.82 13,535 3.04 0.1651
2025-07-31 2025-06-30 13F MERCK COM 58933Y105 165,938 -36,725 -18.12 13,136 -27.79 0.1737
2025-04-23 2025-03-31 13F MERCK COM 58933Y105 202,663 -665 -0.33 18,191 -10.07 0.2747
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 203,328 -2,910 -1.41 20,227 -13.63 0.3018
2024-11-05 2024-09-30 13F MERCK COM 58933Y105 206,238 6,503 3.26 23,420 -5.29 0.3572
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 199,735 1,598 0.81 24,727 -5.42 0.3925
2024-05-07 2024-03-31 13F MERCK COM 58933Y105 198,137 -138 -0.07 26,144 20.95 0.4335
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 198,275 -15,213 -7.13 21,616 -1.65 0.3972
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 213,488 -52,377 -19.70 21,979 -28.36 0.4537
2023-08-03 2023-06-30 13F MERCK COM 58933Y105 265,865 -12,247 -4.40 30,678 3.68 0.6138
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 278,112 -10,914 -3.78 29,588 -7.73 0.6274
2023-02-08 2022-12-31 13F MERCK COM 58933Y105 289,026 -21,203 -6.83 32,067 20.02 0.7300
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 310,229 -10,079 -3.15 26,717 -8.51 0.6250
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 320,308 11,314 3.66 29,203 15.19 0.6286
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 308,994 16,668 5.70 25,353 13.17 0.4570
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 292,326 14,070 5.06 22,403 7.19 0.3917
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 278,256 -5,916 -2.08 20,900 -5.43 0.3912
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 284,172 19,254 7.27 22,100 8.21 0.3961
2021-05-10 2021-03-31 13F MERCK & CO. COM 58933Y105 264,918 -2,811 -1.05 20,423 -6.74 0.4075
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 267,729 -1,856 -0.69 21,900 -2.07 0.4621
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 269,585 -5,305 -1.93 22,362 5.19 0.5595
2020-08-11 2020-06-30 13F MERCK & CO. COM 58933Y105 274,890 -42,076 -13.27 21,258 -12.83 0.5500
2020-05-08 2020-03-31 13F MERCK & CO. COM 58933Y105 316,966 31,846 11.17 24,387 -5.96 0.7404
2020-02-07 2019-12-31 13F MERCK COM 58933Y105 285,120 -10,343 -3.50 25,932 4.26 0.6422
2019-10-31 2019-09-30 13F MERCK COM 58933Y105 295,463 1,575 0.54 24,873 0.93 0.6776
2019-08-09 2019-06-30 13F MERCK COM 58933Y105 293,888 -6,984 -2.32 24,643 -1.52 0.6697
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 300,872 7,976 2.72 25,024 11.81 0.6685
2019-01-29 2018-12-31 13F MERCK COM 58933Y105 292,896 -785 -0.27 22,380 7.42 0.6997
2018-10-26 2018-09-30 13F MERCK COM 58933Y105 293,681 8,940 3.14 20,834 20.54 0.5303
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 284,741 3,760 1.34 17,284 12.93 0.4691
2018-05-01 2018-03-31 13F MERCK COM 58933Y105 280,981 15,376 5.79 15,305 2.41 0.3932
2018-02-07 2017-12-31 13F MERCK COM 58933Y105 265,605 -30,008 -10.15 14,945 -21.04 0.3847
2017-11-09 2017-09-30 13F MERCK COM 58933Y105 295,613 9,465 3.31 18,928 3.21 0.5066
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 286,148 -8,256 -2.80 18,339 -1.96 0.5056
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 294,404 -1,286 -0.43 18,706 7.46 0.5295
2017-02-01 2016-12-31 13F MERCK COM 58933Y105 295,690 -8,241 -2.71 17,407 -8.23 0.5067
2016-11-07 2016-09-30 13F MERCK COM 58933Y105 303,931 -35,536 -10.47 18,968 -3.01 0.5530
2016-08-08 2016-06-30 13F MERCK COM 58933Y105 339,467 -19,955 -5.55 19,557 2.84 0.5830
2016-04-26 2016-03-31 13F MERCK & CO INC COM 58933Y105 359,422 1,042 0.29 19,017 0.46 0.5775
2016-02-03 2015-12-31 13F MERCK & CO INC COM 58933Y105 358,380 2,900 0.82 18,930 7.82 0.5633
2015-11-13 2015-09-30 13F MERCK & CO INC COM 58933Y105 355,480 20,802 6.22 17,557 -7.85 0.5333
2015-08-12 2015-06-30 13F MERCK & CO INC COM 58933Y105 334,678 -9,333 -2.71 19,053 -3.64 0.5300
2015-05-08 2015-03-31 13F MERCK & CO INC COM 58933Y105 344,011 11,430 3.44 19,773 4.69 0.5383
2015-02-10 2014-12-31 13F MERCK & CO INC COM 58933Y105 332,581 -11,756 -3.41 18,887 -7.47 0.5422
2014-11-12 2014-09-30 13F MERCK & CO INC COM 58933Y105 344,337 -40,046 -10.42 20,412 -8.20 0.6071
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 384,383 -20,791 -5.13 22,236 -3.33 0.6690
2014-05-09 2014-03-31 13F MERCK & CO INC COM 58933Y105 405,174 28,445 7.55 23,001 21.99 0.6896
2014-02-12 2013-12-31 13F MERCK & CO INC COM 58933Y105 376,729 -16,325 -4.15 18,855 0.76 0.6031
2013-11-01 2013-09-30 13F MERCK & CO INC COM 58933Y105 393,054 61,193 18.44 18,712 21.39 0.6577
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 331,861 331,861 15,415 0.5959
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.