Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionNomura Asset Management Co Ltd
Latest Disclosed Ownership1,579,855 shares
Latest Disclosed Value $ 190,040,758
Nomura Asset Management Co Ltd reports 14.02% increase in ownership of MRK / Merck & Co., Inc.

On May 11, 2026 - Nomura Asset Management Co Ltd filed a 13F-HR form disclosing ownership of 1,579,855 shares of Merck & Co., Inc. (MX:MRK) valued at $190,040,758 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,385,592 shares of Merck & Co., Inc.. This represents a change in shares of 14.02% 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)
2026-05-11 2026-03-31 13F MERCK COM 58933Y105 1,579,855 194,263 14.02 190,041 30.30 0.3068
2026-02-10 2025-12-31 13F MERCK COM 58933Y105 1,385,592 -83,512 -5.68 145,847 18.29 0.3692
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 1,469,104 -75,924 -4.91 123,302 0.82 0.3218
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 1,545,028 6,065 0.39 122,304 -11.46 0.3354
2025-05-12 2025-03-31 13F MERCK COM 58933Y105 1,538,963 47,024 3.15 138,137 -6.93 0.4228
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 1,491,939 -72,337 -4.62 148,418 -16.45 0.4465
2024-11-15 2024-09-30 13F MERCK COM 58933Y105 1,564,276 327,426 26.47 177,639 15.55 0.5477
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 1,236,850 2,811 0.23 153,727 -5.59 0.5239
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 1,234,039 68,953 5.92 162,831 28.20 0.5910
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 1,165,086 29,674 2.61 127,018 8.66 0.5249
2023-11-03 2023-09-30 13F MERCK COM 58933Y105 1,135,412 -80,214 -6.60 116,891 -16.67 0.5478
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 1,215,626 -3,570 -0.29 140,271 8.14 0.6461
2025-01-10 2023-03-31 13F/A-1 MERCK COM 58933Y105 1,219,196 110,835 10.00 129,710 5.48 0.6815
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 1,219,196 110,835 129,710 0.6815
2025-01-10 2022-12-31 13F/A-1 MERCK COM 58933Y105 1,108,361 26,491 2.45 122,973 31.99 0.7144
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 1,108,361 26,491 122,973 0.7144
2025-01-10 2022-09-30 13F/A-3 MERCK COM 58933Y105 1,081,870 4,900 0.45 93,171 -5.11 0.5932
2022-11-14 2022-09-30 13F/A-2 MERCK COM 58933Y105 1,081,870 4,900 93,170 0.5932
2022-11-10 2022-09-30 13F/A-1 MERCK COM 58933Y105 1,081,870 4,900 93,170 0.5932
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 1,081,870 4,900 93,170 0.3750
2025-01-10 2022-06-30 13F/A-1 MERCK COM 58933Y105 1,076,970 274,635 34.23 98,187 49.15 0.6132
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 1,076,970 274,635 98,187 0.6057
2025-01-10 2022-03-31 13F/A-1 MERCK COM 58933Y105 802,335 944 0.12 65,832 7.19 0.3582
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 802,335 944 65,832 0.3582
2025-01-10 2021-12-31 13F/A-2 MERCK COM 58933Y105 801,391 -16,600 -2.03 61,419 -0.03 0.3103
2022-02-01 2021-12-31 13F MERCK COM 58933Y105 801,391 -16,600 61,419 0.3103
2025-01-10 2021-09-30 13F/A-2 MERCK COM 58933Y105 817,991 -32,493 -3.82 61,439 -7.11 0.3467
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 817,991 -32,493 61,439 0.3467
2025-01-10 2021-06-30 13F/A-2 MERCK COM 58933Y105 850,484 -82,181 -8.81 66,142 -8.01 0.3830
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 850,484 -82,181 66,143 0.3830
2025-01-10 2021-03-31 13F/A-2 MERCK & CO. COM 58933Y105 932,665 -316,929 -25.36 71,899 -29.66 0.4582
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 932,665 -316,929 71,899 0.4582
2025-01-10 2020-12-31 13F/A-2 MERCK & CO. COM 58933Y105 1,249,594 116,269 10.26 102,217 8.73 0.6877
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 1,249,594 116,269 102,216 0.6877
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 1,133,325 -87,797 -7.19 94,009 -0.45 0.7217
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 1,221,122 -61,039 -4.76 94,431 -4.28 0.7990
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 1,282,161 139,508 12.21 98,650 -5.08 1.0194
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 1,142,653 1,935 0.17 103,925 8.23 0.9312
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 1,140,718 42,435 3.86 96,025 4.27 0.9170
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 1,098,283 -612,586 -35.81 92,092 -35.28 0.9099
2019-05-10 2019-03-31 13F/A-1 MERCK COM 58933Y105 1,710,869 -126,639 -6.89 142,293 1.35 1.3984
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 1,710,869 -126,639 142,293
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 1,837,508 311,732 20.43 140,403 29.71 1.5692
2018-11-07 2018-09-30 13F MERCK COM 58933Y105 1,525,776 282,695 22.74 108,240 43.45 1.0502
2018-08-03 2018-06-30 13F MERCK COM 58933Y105 1,243,081 1,994 0.16 75,455 11.62 0.7834
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 1,241,087 24,777 2.04 67,602 -1.23 0.7382
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 1,216,310 84,945 7.51 68,443 -5.52 0.7921
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 1,131,365 612,429 118.02 72,441 117.81 0.9355
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 518,936 -4,884 -0.93 33,259 -0.07 0.4474
2017-06-28 2017-03-31 13F/A-1 MERCK COM 58933Y105 523,820 9,531 1.85 33,283 9.87 0.4687
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 523,820 33,283
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 514,289 7,353 1.45 30,293 -4.25 0.5457
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 506,936 9,829 1.98 31,638 10.48 0.5676
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 497,107 32,919 7.09 28,638 16.60 0.5357
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 464,188 55,405 13.55 24,560 13.75 0.4678
2016-02-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 408,783 -200,890 -32.95 21,592 -28.29 0.4177
2015-11-13 2015-09-30 13F MERCK & CO INC COM 58933Y105 609,673 -71,730 -10.53 30,112 -22.38 0.6032
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 681,403 -251,914 -26.99 38,792 -27.69 0.7179
2015-05-13 2015-03-31 13F MERCK & CO INC COM 58933Y105 933,317 -393,777 -29.67 53,647 -29.77 0.9562
2015-02-13 2014-12-31 13F MERCK & CO INC COM 58933Y105 1,327,094 -97,728 -6.86 76,391 -9.15 1.3347
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,424,822 17,116 1.22 84,083 3.24 1.4864
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 1,407,706 -273,254 -16.26 81,448 -14.54 1.5055
2014-05-14 2014-03-31 13F MERCK & CO INC COM 58933Y105 1,680,960 170,686 11.30 95,302 26.08 1.7429
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 1,510,274 -228,425 -13.14 75,589 -8.69 1.3585
2013-11-13 2013-09-30 13F MERCK & CO INC COM 58933Y105 1,738,699 -30,995 -1.75 82,780 0.70 1.5675
2013-08-13 2013-06-30 13F MERCK & CO INC COM 58933Y105 1,769,694 1,769,694 82,203 1.6289
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.