Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionPinnacle Associates Ltd
Latest Disclosed Ownership485,756 shares
Latest Disclosed Value $ 58,431,626
Pinnacle Associates Ltd reports 8.85% increase in ownership of 6MK / Merck & Co., Inc.

On April 21, 2026 - Pinnacle Associates Ltd filed a 13F-HR form disclosing ownership of 485,756 shares of Merck & Co., Inc. (BG:6MK) valued at $58,431,626 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 446,260 shares of Merck & Co., Inc.. This represents a change in shares of 8.85% 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)
2026-04-21 2026-03-31 13F MERCK COM 58933Y105 485,756 39,496 8.85 58,432 24.39 0.7490
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 446,260 3,144 0.71 46,973 26.31 0.6027
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 443,116 292 0.07 37,191 6.10 0.4935
2025-08-04 2025-06-30 13F MERCK COM 58933Y105 442,824 -549 -0.12 35,054 -11.92 0.5075
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 443,373 -25,530 -5.44 39,797 -14.68 0.5831
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 468,903 -5,162 -1.09 46,646 -9.74 0.6329
2024-10-25 2024-09-30 13F MERCK COM 58933Y105 474,065 13,301 2.89 51,683 -9.40 0.8788
2024-07-30 2024-06-30 13F MERCK COM 58933Y105 460,764 -9,338 -1.99 57,043 -8.04 0.8931
2024-04-26 2024-03-31 13F MERCK COM 58933Y105 470,102 -3,963 -0.84 62,030 20.02 0.9776
2024-01-19 2023-12-31 13F MERCK COM 58933Y105 474,065 -1,091 -0.23 51,683 5.65 0.8696
2023-10-24 2023-09-30 13F MERCK COM 58933Y105 475,156 -3,900 -0.81 48,917 -11.51 0.9093
2023-07-27 2023-06-30 13F MERCK COM 58933Y105 479,056 44,092 10.14 55,278 19.46 0.9592
2023-05-05 2023-03-31 13F MERCK COM 58933Y105 434,964 -23,132 -5.05 46,276 -8.95 0.9465
2023-02-01 2022-12-31 13F/A-1 MERCK COM 58933Y105 458,096 -13,558 -2.87 50,826 25.13 1.1075
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 457,531 -14,123 49,185 0.0010
2022-11-01 2022-09-30 13F MERCK COM 58933Y105 471,654 -4,342 -0.91 40,619 -6.40 0.9323
2022-08-02 2022-06-30 13F MERCK COM 58933Y105 475,996 -23,456 -4.70 43,397 5.90 0.9463
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 499,452 8,231 1.68 40,980 8.85 0.7254
2022-02-02 2021-12-31 13F MERCK COM 58933Y105 491,221 36,355 7.99 37,647 10.19 0.6494
2021-10-19 2021-09-30 13F MERCK COM 58933Y105 454,866 17,430 3.98 34,165 0.43 0.6298
2021-08-02 2021-06-30 13F MERCK COM 58933Y105 437,436 11,496 2.70 34,019 3.60 0.6151
2021-05-12 2021-03-31 13F MERCK & CO. COM 58933Y105 425,940 33,330 8.49 32,836 2.25 0.6262
2021-01-26 2020-12-31 13F MERCK & CO. COM 58933Y105 392,610 -5,245 -1.32 32,115 -2.69 0.6521
2020-10-23 2020-09-30 13F MERCK & CO. COM 58933Y105 397,855 -6,593 -1.63 33,002 5.52 0.7838
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 404,448 -10,578 -2.55 31,276 -2.05 0.7712
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 415,026 23,498 6.00 31,932 -10.33 0.9700
2020-02-03 2019-12-31 13F MERCK COM 58933Y105 391,528 -39,728 -9.21 35,610 -1.91 0.7798
2019-11-08 2019-09-30 13F MERCK COM 58933Y105 431,256 -112,540 -20.70 36,303 -20.38 0.8551
2019-08-05 2019-06-30 13F MERCK COM 58933Y105 543,796 -4,086 -0.75 45,597 0.07 1.0677
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 547,882 -30,850 -5.33 45,567 3.04 1.0295
2019-02-05 2018-12-31 13F MERCK COM 58933Y105 578,732 -35,410 -5.77 44,221 1.50 1.1416
2018-11-09 2018-09-30 13F MERCK COM 58933Y105 614,142 106,121 20.89 43,567 41.28 0.9039
2018-08-08 2018-06-30 13F MERCK COM 58933Y105 508,021 -27,282 -5.10 30,837 5.76 0.6344
2018-05-11 2018-03-31 13F MERCK COM 58933Y105 535,303 -2,500 -0.46 29,158 -3.65 0.5714
2018-02-12 2017-12-31 13F MERCK COM 58933Y105 537,803 34,987 6.96 30,262 -6.00 0.5814
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 502,816 -11,221 -2.18 32,195 -2.28 0.5935
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 514,037 331 0.06 32,945 0.93 0.6332
2017-05-09 2017-03-31 13F MERCK COM 58933Y105 513,706 -3,095 -0.60 32,641 7.29 0.6234
2017-02-10 2016-12-31 13F MERCK COM 58933Y105 516,801 -34,986 -6.34 30,424 -11.65 0.6139
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 551,787 6,427 1.18 34,437 9.61 0.6907
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 545,360 -5,043 -0.92 31,418 7.88 0.6770
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 550,403 -14,012 -2.48 29,122 -2.31 0.6229
2016-02-11 2015-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 564,415 80,316 16.59 29,812 24.68 0.6255
2016-02-09 2015-12-31 13F MERCK & CO INC COM 58933Y105 564,415 80,316 29,812 0.6370
2015-11-10 2015-09-30 13F MERCK & CO INC COM 58933Y105 484,099 -5,468 -1.12 23,910 -14.21 0.5290
2015-08-12 2015-06-30 13F MERCK & CO INC COM 58933Y105 489,567 4,498 0.93 27,871 -0.04 0.5174
2015-05-15 2015-03-31 13F Merck COM 58933Y105 485,069 -5,027 -1.03 27,882 0.18 0.5203
2015-02-12 2014-12-31 13F Merck COM 58933Y105 490,096 1,369 0.28 27,833 -3.93 0.5458
2014-11-12 2014-09-30 13F Merck COM 58933Y105 488,727 -2,960 -0.60 28,972 1.86 0.5899
2014-08-14 2014-06-30 13F Merck COM 58933Y105 491,687 -5,970 -1.20 28,444 0.68 0.5552
2014-05-14 2014-03-31 13F Merck COM 58933Y105 497,657 -25,228 -4.82 28,252 7.96 0.5509
2014-02-12 2013-12-31 13F Merck COM 58933Y105 522,885 -31,153 -5.62 26,170 -0.78 0.5110
2013-11-14 2013-09-30 13F Merck COM 58933Y105 554,038 4,308 0.78 26,377 3.30 0.5457
2013-08-13 2013-06-30 13F Merck COM 58933Y105 549,730 549,730 25,535 0.5739
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.