Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionFisher Asset Management, LLC
Latest Disclosed Ownership26,436,284 shares
Latest Disclosed Value $ 3,180,020,742
Fisher Asset Management, LLC reports 6.28% increase in ownership of MRK / Merck & Co., Inc.

On May 5, 2026 - Fisher Asset Management, LLC filed a 13F-HR form disclosing ownership of 26,436,284 shares of Merck & Co., Inc. (MX:MRK) valued at $3,180,020,742 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 24,873,327 shares of Merck & Co., Inc.. This represents a change in shares of 6.28% 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)
2026-05-05 2026-03-31 13F MERCK COM 58933Y105 26,436,284 1,562,957 6.28 3,180,021 21.46 1.0784
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 24,873,327 805,201 3.35 2,618,166 29.61 0.8936
2025-11-12 2025-09-30 13F MERCK AND COM 58933Y105 24,068,126 -945,571 -3.78 2,020,038 2.02 0.7311
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 25,013,697 567,900 2.32 1,980,084 -9.76 0.7861
2025-05-14 2025-03-31 13F MERCK AND COM 58933Y105 24,445,797 8,334,193 51.73 2,194,255 36.90 0.9499
2025-02-05 2024-12-31 13F MERCK AND COM 58933Y105 16,111,604 1,458,169 9.95 1,602,782 -3.68 0.6377
2024-11-12 2024-09-30 13F MERCK AND COM 58933Y105 14,653,435 387,420 2.72 1,664,044 -5.78 0.6819
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 14,266,015 395,572 2.85 1,766,133 -3.50 0.7684
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 13,870,443 319,201 2.36 1,830,205 23.88 0.8548
2024-03-05 2023-12-31 13F/A-1 MERCK COM 58933Y105 13,551,242 212,852 1.60 1,477,357 7.59 0.7811
2024-02-06 2023-12-31 13F MERCK COM 58933Y105 13,566,968 228,578 1,479,071 0.7282
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 13,338,390 703,069 5.56 1,373,187 -5.82 0.7788
2023-12-12 2023-06-30 13F/A-1 MERCK COM 58933Y105 12,635,321 289,608 2.35 1,457,990 10.91 0.8060
2023-08-08 2023-06-30 13F MERCK COM 58933Y105 12,637,385 291,672 1,459 0.8064
2023-12-12 2023-03-31 13F/A-1 MERCK COM 58933Y105 12,345,713 165,927 1.36 1,314,594 97,205.18 0.7984
2023-05-01 2023-03-31 13F MERCK COM 58933Y105 12,346,490 166,704 1,314 0.7955
2023-02-03 2022-12-31 13F MERCK COM 58933Y105 12,179,786 143,329 1.19 1,351 -99.87 0.9135
2022-11-08 2022-09-30 13F MERCK COM 58933Y105 12,036,457 -87,363 -0.72 1,036,580 -6.22 0.7770
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 12,123,820 291,723 2.47 1,105,329 13.85 0.7822
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 11,832,097 422,415 3.70 970,824 11.02 0.5728
2022-02-02 2021-12-31 13F MERCK& CO. COM 58933Y105 11,409,682 776,418 7.30 874,438 9.49 0.4897
2021-10-26 2021-09-30 13F MERCK& CO. COM 58933Y105 10,633,264 316,452 3.07 798,665 -0.46 0.4961
2021-07-27 2021-06-30 13F MERCK& CO. COM 58933Y105 10,316,812 458,571 4.65 802,339 5.57 0.5038
2021-04-27 2021-03-31 13F MERCK& CO. COM 58933Y105 9,858,241 283,112 2.96 759,972 -2.97 0.5353
2021-01-29 2020-12-31 13F MERCK& CO. COM 58933Y105 9,575,129 296,854 3.20 783,246 1.77 0.5868
2020-11-12 2020-09-30 13F/A-1 MERCK& CO. COM 58933Y105 9,278,275 175,397 1.93 769,633 9.33 0.6736
2020-11-10 2020-09-30 13F MERCK& CO. COM 58933Y105 9,278,275 175,397 769,633 653,551.1582
2020-08-07 2020-06-30 13F MERCK& CO. COM 58933Y105 9,102,878 195,367 2.19 703,926 2.71 0.6870
2020-04-28 2020-03-31 13F MERCK& CO. COM 58933Y105 8,907,511 17,477 0.20 685,344 -15.24 0.8499
2020-02-12 2019-12-31 13F MERCK& COM 58933Y105 8,890,034 -106,476 -1.18 808,549 6.76 0.8171
2019-10-29 2019-09-30 13F MERCK& COM 58933Y105 8,996,510 234,582 2.68 757,326 3.08 0.8311
2019-07-30 2019-06-30 13F MERCK& COM 58933Y105 8,761,928 280,171 3.30 734,688 4.15 0.8122
2019-04-22 2019-03-31 13F/A-1 MERCK& COM 58933Y105 8,481,757 55,441 0.66 705,428 9.56 0.8270
2019-04-22 2019-03-31 13F MERCK& COM 58933Y105 8,426,316 0 643,855
2019-01-25 2018-12-31 13F MERCK& COM 58933Y105 8,426,316 380,173 4.72 643,855 12.80 0.8794
2018-10-23 2018-09-30 13F MERCK& COM 58933Y105 8,046,143 117,937 1.49 570,793 18.61 0.6929
2018-07-09 2018-06-30 13F MERCK& COM 58933Y105 7,928,206 279,948 3.66 481,242 15.52 0.6248
2018-05-10 2018-03-31 13F/A-2 MERCK& COM 58933Y105 7,648,258 300,086 4.08 416,601 0.75 0.5525
2018-04-20 2018-03-31 13F/A-1 MERCK& COM 58933Y105 8,261,737 613,479 450,017 0.5491
2018-04-19 2018-03-31 13F MERCK& COM 58933Y105 8,261,737 913,565 450,017
2018-01-24 2017-12-31 13F MERCK& COM 58933Y105 7,348,172 55,857 0.77 413,482 -11.45 0.5401
2017-10-17 2017-09-30 13F MERCK& COM 58933Y105 7,292,315 192,007 2.70 466,927 2.61 0.6549
2017-07-12 2017-06-30 13F MERCK& COM 58933Y105 7,100,308 237,347 3.46 455,059 4.35 0.6862
2017-04-24 2017-03-31 13F MERCK& COM 58933Y105 6,862,961 60,697 0.89 436,073 8.90 0.6984
2017-01-10 2016-12-31 13F MERCK& COM 58933Y105 6,802,264 -15,280 -0.22 400,449 -5.88 0.6973
2016-10-11 2016-09-30 13F MERCK& COM 58933Y105 6,817,544 58,199 0.86 425,483 6.08 0.7555
2016-07-12 2016-06-30 13F MERCK& COM 58933Y105 6,759,345 61,110 0.91 401,100 6.66 0.7442
2016-04-18 2016-03-31 13F MERCK& CO INC COM 58933Y105 6,698,235 -123,835 -1.82 376,039 4.36 0.7145
2016-01-14 2015-12-31 13F MERCK& CO INC COM 58933Y105 6,822,070 60,364 0.89 360,342 7.90 0.6942
2015-10-20 2015-09-30 13F MERCK& CO INC COM 58933Y105 6,761,706 -74,841 -1.09 333,961 -14.19 0.6957
2015-07-17 2015-06-30 13F MERCK& CO INC COM 58933Y105 6,836,547 157,048 2.35 389,205 1.37 0.7565
2015-04-30 2015-03-31 13F MERCK& CO INC COM 58933Y105 6,679,499 6,679,499 0.00 383,938 0.7671
2015-01-29 2014-12-31 13F MERCK& CO INC COM 58933Y105 0 -6,533,475 -100.00 0 -100.00
2014-10-20 2014-09-30 13F MERCK& CO INC COM 58933Y105 6,533,475 69,232 1.07 387,304 3.57 0.8256
2014-07-25 2014-06-30 13F MERCK& CO INC COM 58933Y105 6,464,243 5,739,185 791.55 373,956 808.50 0.7862
2014-04-22 2014-03-31 13F MERCK& CO INC COM 58933Y105 725,058 -374,907 -34.08 41,162 -25.23 0.0928
2014-01-16 2013-12-31 13F/A-1 MERCK& CO INC COM 58933Y105 1,099,965 215 0.02 55,053 5.15 0.1248
2014-01-14 2013-12-31 13F MERCK& CO INC COM 58933Y105 1,197,965 59,958
2013-10-18 2013-09-30 13F MERCK& CO INC COM 58933Y105 1,099,750 -50,944 -4.43 52,358 -2.04 0.1290
2013-07-16 2013-06-30 13F MERCK& CO INC COM 58933Y105 1,150,694 1,150,694 53,450 0.1388
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.