Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionGeode Capital Management, Llc
Latest Disclosed Ownership59,558,154 shares
Latest Disclosed Value $ 7,140,235,212
Geode Capital Management, Llc reports 0.82% decrease in ownership of 6MK / Merck & Co., Inc.

On May 15, 2026 - Geode Capital Management, Llc filed a 13F-HR form disclosing ownership of 59,558,154 shares of Merck & Co., Inc. (BG:6MK) valued at $7,140,235,212 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 60,047,984 shares of Merck & Co., Inc.. This represents a change in shares of -0.82% 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 59,558,154 -489,830 -0.82 7,140,235 13.20 0.2374
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 60,047,984 249,110 0.42 6,307,572 26.00 0.3893
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 59,798,874 846,193 1.44 5,005,979 7.62 0.3193
2025-08-08 2025-06-30 13F MERCK COM 58933Y105 58,952,681 -704,589 -1.18 4,651,539 -12.96 0.3260
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 59,657,270 -1,524,593 -2.49 5,343,873 -12.00 0.4201
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 61,181,863 2,026,859 3.43 6,072,582 -9.31 0.4705
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 59,155,004 2,134,296 3.74 6,696,060 -4.91 0.5422
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 57,020,708 609,479 1.08 7,041,854 -5.17 0.6180
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 56,411,229 982,984 1.77 7,425,833 23.17 0.6867
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 55,428,245 1,354,125 2.50 6,028,744 8.49 0.6307
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 54,074,120 1,350,663 2.56 5,556,721 -8.44 0.6618
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 52,723,457 1,504,701 2.94 6,068,750 11.60 0.7131
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 51,218,756 2,879,481 5.96 5,438,036 101,469.59 0.7062
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 48,339,275 238,356 0.50 5,354 -99.87 0.7514
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 48,100,919 2,106,251 4.58 4,138,633 -1.14 0.6278
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 45,994,668 1,587,055 3.57 4,186,245 15.17 0.6132
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 44,407,613 -3,745,670 -7.78 3,634,844 -1.28 0.4537
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 48,153,283 5,409,154 12.65 3,682,009 15.00 0.4435
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 42,744,129 -1,465,619 -3.32 3,201,833 -6.63 0.4310
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 44,209,748 1,435,230 3.36 3,429,289 4.26 0.4725
2021-05-12 2021-03-31 13F MERCK COM 58933Y105 42,774,518 671,918 1.60 3,289,283 -4.27 0.5031
2021-02-12 2020-12-31 13F MERCK COM 58933Y105 42,102,600 738,928 1.79 3,435,880 0.32 0.5767
2020-11-13 2020-09-30 13F MERCK COM 58933Y105 41,363,672 1,273,605 3.18 3,424,930 10.65 0.6711
2020-08-13 2020-06-30 13F MERCK COM 58933Y105 40,090,067 213,164 0.53 3,095,304 1.05 0.6622
2020-05-14 2020-03-31 13F MERCK COM 58933Y105 39,876,903 -103,507 -0.26 3,063,213 -15.60 0.7983
2020-02-20 2019-12-31 13F/A-1 MERCK COM 58933Y105 39,980,410 685,744 1.75 3,629,567 9.87 0.7586
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 39,980,410 685,744 3,629,567 462,556.4897
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 39,294,666 612,419 1.58 3,303,543 2.00 0.7710
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 38,682,247 825,934 2.18 3,238,858 3.02 0.7837
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 37,856,313 3,823,947 11.24 3,143,842 21.10 0.8146
2019-03-06 2018-12-31 13F/A-1 MERCK COM 58933Y105 34,032,366 3,219,877 10.45 2,596,161 19.01 0.8026
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 34,032,366 3,219,877 2,596,161
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 30,812,489 111,830 0.36 2,181,553 17.31 0.6147
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 30,700,659 319,906 1.05 1,859,634 12.63 0.5717
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 30,380,753 1,263,927 4.34 1,651,056 0.98 0.5379
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 29,116,826 957,657 3.40 1,634,999 -9.14 0.5552
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 28,159,169 582,299 2.11 1,799,538 1.99 0.6642
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 27,576,870 2,064 0.01 1,764,415 0.84 0.6938
2017-06-21 2017-03-31 13F/A-1 MERCK & CO INC COM COM 58933Y105 27,574,806 1,941,708 7.58 1,749,680 16.08 0.7177
2017-05-12 2017-03-31 13F MERCK & CO INC COM COM 58933Y105 27,574,806 1,749,680
2017-02-14 2016-12-31 13F MERCK & CO INC COM COM 58933Y105 25,633,098 1,115,441 4.55 1,507,249 -1.34 0.7009
2016-11-10 2016-09-30 13F MERCK & CO INC COM COM 58933Y105 24,517,657 1,050,444 4.48 1,527,779 13.20 0.7693
2016-08-12 2016-06-30 13F MERCK & CO INC COM COM 58933Y105 23,467,213 -188,821 -0.80 1,349,660 8.04 0.7340
2016-05-13 2016-03-31 13F MERCK & CO INC COM COM 58933Y105 23,656,034 353,474 1.52 1,249,222 1.70 0.6629
2016-02-12 2015-12-31 13F MERCK & CO INC COM COM 58933Y105 23,302,560 -131,392 -0.56 1,228,387 6.33 0.7001
2015-11-13 2015-09-30 13F MERCK & CO INC COM COM 58933Y105 23,433,952 161,537 0.69 1,155,235 -12.64 0.7006
2015-08-14 2015-06-30 13F MERCK & CO INC COM COM 58933Y105 23,272,415 40,817 0.18 1,322,394 -0.82 0.7549
2015-05-14 2015-03-31 13F MERCK & CO INC COM COM 58933Y105 23,231,598 726,820 3.23 1,333,361 4.46 0.7621
2015-02-12 2014-12-31 13F MERCK & CO INC COM COM 58933Y105 22,504,778 704,911 3.23 1,276,469 -1.10 0.7594
2014-11-14 2014-09-30 13F MERCK & CO INC COM COM 58933Y105 21,799,867 -300,947 -1.36 1,290,697 1.01 0.8367
2014-08-13 2014-06-30 13F MERCK & CO INC COM COM 58933Y105 22,100,814 -466,089 -2.07 1,277,793 -0.22 0.8261
2014-05-14 2014-03-31 13F MERCK & CO INC COM COM 58933Y105 22,566,903 425,372 1.92 1,280,598 15.59 0.8590
2014-02-14 2013-12-31 13F MERCK & CO INC COM COM 58933Y105 22,141,531 1,242,162 5.94 1,107,870 11.37 0.7681
2013-11-14 2013-09-30 13F MERCK & CO INC COM COM 58933Y105 20,899,369 42,944 0.21 994,772 2.70 0.7976
2013-08-14 2013-06-30 13F MERCK & CO INC COM COM 58933Y105 20,856,425 20,856,425 968,582 0.8515
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.