Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership232,295 shares
Latest Disclosed Value $ 27,942,741
Assetmark, Inc reports 32.84% increase in ownership of MRK / Merck & Co., Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 232,295 shares of Merck & Co., Inc. (US:MRK) valued at $27,942,766 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 174,873 shares of Merck & Co., Inc.. This represents a change in shares of 32.84% during the quarter. The current value of the position is $26,644,236 USD.

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)
2026-05-06 2026-03-31 13F MERCK COM 58933Y105 232,295 57,422 32.84 27,943 51.80 0.0570
2026-01-23 2025-12-31 13F MERCK COM 58933Y105 174,873 -2,045 -1.16 18,407 23.97 0.0375
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 176,918 22,483 14.56 14,849 21.46 0.0318
2025-08-04 2025-06-30 13F MERCK COM 58933Y105 154,435 -3,278 -2.08 12,225 -13.64 0.0289
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 157,713 -9,182 -5.50 14,156 -14.73 0.0389
2025-02-06 2024-12-31 13F MERCK COM 58933Y105 166,895 19,719 13.40 16,603 -0.66 0.0451
2024-11-01 2024-09-30 13F MERCK COM 58933Y105 147,176 16,911 12.98 16,713 3.64 0.0479
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 130,265 14,495 12.52 16,127 5.57 0.0499
2024-05-07 2024-03-31 13F MERCK COM 58933Y105 115,770 11,935 11.49 15,276 34.94 0.0497
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 103,835 -4,208 -3.89 11,320 1.77 0.0409
2023-10-27 2023-09-30 13F MERCK COM 58933Y105 108,043 3,284 3.13 11,123 -7.98 0.0445
2023-08-11 2023-06-30 13F MERCK & CO INC COM COM 58933Y105 104,759 23,677 29.20 12,088 40.13 0.0474
2023-05-05 2023-03-31 13F MERCK & CO INC COM COM 58933Y105 81,082 4,806 6.30 8,626 1.94 0.0357
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 76,276 8,476 12.50 8,463 44.92 0.0367
2022-11-01 2022-09-30 13F MERCK COM 58933Y105 67,800 6,281 10.21 5,839 4.10 0.0273
2022-08-03 2022-06-30 13F MERCK & CO INC COM COM 58933Y105 61,519 33,541 119.88 5,609 144.29 0.0251
2022-05-13 2022-03-31 13F MERCK & CO INC COM COM 58933Y105 27,978 6,882 32.62 2,296 41.99 0.0096
2022-02-14 2021-12-31 13F MERCK & CO INC COM COM 58933Y105 21,096 -334,748 -94.07 1,617 -93.95 0.0066
2021-11-12 2021-09-30 13F MERCK & CO INC COM COM 58933Y105 355,844 11,402 3.31 26,727 -0.22 0.1197
2021-08-16 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 344,442 -167,646 -32.74 26,787 -32.15 0.1242
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 512,088 -421,343 -45.14 39,477 -48.30 0.2036
2021-02-10 2020-12-31 13F MERCK & CO. INC COM COM 58933Y105 933,431 113,386 13.83 76,355 12.25 0.4254
2020-11-13 2020-09-30 13F MERCK & CO. INC COM COM 58933Y105 820,045 86,690 11.82 68,023 18.64 0.4389
2020-08-11 2020-06-30 13F MERCK & CO. INC COM COM 58933Y105 733,355 140,886 23.78 57,337 25.78 0.4102
2020-05-12 2020-03-31 13F MERCK & CO. INC COM COM 58933Y105 592,469 528,102 820.45 45,585 678.70 0.3860
2020-02-11 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 64,367 52,143 426.56 5,854 468.90 0.0445
2019-11-13 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 12,224 1,041 9.31 1,029 9.70 0.0086
2019-08-14 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 11,183 2,716 32.08 938 33.24 0.0076
2019-05-14 2019-03-31 13F MERCK & CO INC COM COM 58933Y105 8,467 341 4.20 704 13.37 0.0064
2019-02-13 2018-12-31 13F MERCK & CO INC COM COM 58933Y105 8,126 891 12.32 621 21.05 0.0060
2018-11-13 2018-09-30 13F MERCK & CO INC COM COM 58933Y105 7,235 -216 -2.90 513 13.50 0.0047
2018-08-01 2018-06-30 13F MERCK & CO INC COM COM 58933Y105 7,451 -395 -5.03 452 5.85 0.0044
2018-05-16 2018-03-31 13F MERCK & CO INC COM COM 58933Y105 7,846 -18,062 -69.72 427 -70.71 0.0044
2018-02-13 2017-12-31 13F MERCK & CO INC COM COM 58933Y105 25,908 -8,050 -23.71 1,458 -32.97 0.0150
2017-11-08 2017-09-30 13F MERCK & CO INC COM COM 58933Y105 33,958 -7,334 -17.76 2,175 -17.80 0.0247
2017-08-14 2017-06-30 13F MERCK & CO INC COM COM 58933Y105 41,292 3,088 8.08 2,646 9.02 0.0333
2017-09-15 2017-03-31 13F/A-1 MERCK & CO INC COM COM 58933Y105 38,204 -2,654 -6.50 2,427 0.91 0.0319
2017-05-08 2017-03-31 13F MERCK & CO INC COM COM 58933Y105 38,204 -2,654 2,427
2017-09-15 2016-12-31 13F/A-1 MERCK & CO INC COM COM 58933Y105 40,858 16,956 70.94 2,405 61.19 0.0353
2017-02-14 2016-12-31 13F MERCK & CO INC COM COM 58933Y105 40,858 16,956 2,405
2017-09-14 2016-09-30 13F/A-1 MERCK & CO INC COM COM 58933Y105 23,902 -3,805 -13.73 1,492 -6.57 0.0227
2016-11-04 2016-09-30 13F MERCK & CO INC COM COM 58933Y105 23,902 -3,805 1,492
2017-09-14 2016-06-30 13F/A-1 MERCK & CO INC COM COM 58933Y105 27,707 11,034 66.18 1,597 81.07 0.0269
2016-08-08 2016-06-30 13F MERCK & CO INC COM COM 58933Y105 27,707 11,034 1,597
2017-09-14 2016-03-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 16,673 1,892 12.80 882 12.93 0.0154
2016-05-13 2016-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 16,673 1,892 882
2017-09-14 2015-12-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 14,781 14,062 1,955.77 781 2,069.44 0.0145
2016-02-12 2015-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 14,781 14,062 781
2016-01-05 2015-09-30 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 719 581 421.01 36 350.00 0.0008
2015-11-10 2015-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 719 36
2015-08-13 2015-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 138 138 0.00 8 0.0002
2014-11-10 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 0 -1 -100.00 0 0.0000
2014-08-12 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 1 -49,749 -100.00 0 -100.00
2014-05-06 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 49,750 -5,809 -10.46 2,824 1.55 0.0689
2014-02-11 2013-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 55,559 55,559 2,781 0.0658
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.