Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionDodge & Cox
Latest Disclosed Ownership136,050 shares
Latest Disclosed Value $ 16,365,455
Dodge & Cox reports 1.56% decrease in ownership of 6MK / Merck & Co., Inc.

On May 14, 2026 - Dodge & Cox filed a 13F-HR form disclosing ownership of 136,050 shares of Merck & Co., Inc. (BG:6MK) valued at $16,365,455 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 138,205 shares of Merck & Co., Inc.. This represents a change in shares of -1.56% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F Merck COM 58933Y105 136,050 -2,155 -1.56 16,365 12.50 0.0090
2026-02-13 2025-12-31 13F Merck COM 58933Y105 138,205 -16,070 -10.42 14,547 12.35 0.0079
2025-11-13 2025-09-30 13F Merck COM 58933Y105 154,275 -3,025 -1.92 12,948 3.99 0.0070
2025-08-13 2025-06-30 13F Merck COM 58933Y105 157,300 231 0.15 12,452 -11.68 0.0070
2025-05-14 2025-03-31 13F Merck COM 58933Y105 157,069 -282 -0.18 14,099 -9.93 0.0080
2025-02-13 2024-12-31 13F Merck COM 58933Y105 157,351 -900 -0.57 15,653 -12.89 0.0091
2024-11-13 2024-09-30 13F Merck COM 58933Y105 158,251 -625 -0.39 17,971 -8.63 0.0102
2024-08-13 2024-06-30 13F Merck COM 58933Y105 158,876 -1,619 -1.01 19,669 -7.13 0.0118
2024-05-14 2024-03-31 13F Merck COM 58933Y105 160,495 -450 -0.28 21,177 20.69 0.0123
2024-02-22 2023-12-31 13F/A-1 Merck COM 58933Y105 160,945 -2,850 -1.74 17,546 4.06 0.0111
2024-02-15 2023-12-31 13F Merck COM 58933Y105 160,945 -2,850 17,546 0.0112
2023-11-14 2023-09-30 13F Merck COM 58933Y105 163,795 -6,650 -3.90 16,863 -14.26 0.0114
2023-08-14 2023-06-30 13F Merck COM 58933Y105 170,445 -2,761 -1.59 19,668 6.73 0.0131
2023-05-12 2023-03-31 13F Merck COM 58933Y105 173,206 -2,025 -1.16 18,427 -5.22 0.0126
2023-02-14 2022-12-31 13F Merck COM 58933Y105 175,231 -14,100 -7.45 19,442 19.23 0.0133
2022-11-10 2022-09-30 13F Merck COM 58933Y105 189,331 -3,500 -1.82 16,305 -7.25 0.0124
2022-08-12 2022-06-30 13F Merck COM 58933Y105 192,831 -7,200 -3.60 17,580 7.11 0.0122
2022-05-13 2022-03-31 13F Merck COM 58933Y105 200,031 -14,127 -6.60 16,413 0.00 0.0100
2022-02-14 2021-12-31 13F Merck COM 58933Y105 214,158 -7,520 -3.39 16,413 -1.42 0.0102
2021-11-15 2021-09-30 13F Merck COM 58933Y105 221,678 -7,350 -3.21 16,650 -6.52 0.0108
2021-08-13 2021-06-30 13F Merck COM 58933Y105 229,028 -18,058 -7.31 17,812 -6.49 0.0117
2021-05-14 2021-03-31 13F Merck COM 58933Y105 247,086 -28,078 -10.20 19,048 -15.37 0.0136
2021-02-11 2020-12-31 13F Merck COM 58933Y105 275,164 -32,565 -10.58 22,508 -11.82 0.0178
2020-11-13 2020-09-30 13F Merck COM 58933Y105 307,729 -38,250 -11.06 25,526 -4.59 0.0234
2020-08-13 2020-06-30 13F Merck COM 58933Y105 345,979 -170,979 -33.07 26,755 -32.73 0.0246
2020-05-14 2020-03-31 13F Merck COM 58933Y105 516,958 -172,438 -25.01 39,775 -36.56 0.0430
2020-02-13 2019-12-31 13F Merck COM 58933Y105 689,396 -11,947 -1.70 62,701 6.20 0.0480
2019-11-13 2019-09-30 13F Merck COM 58933Y105 701,343 -13,279 -1.86 59,039 -1.47 0.0486
2019-08-13 2019-06-30 13F Merck COM 58933Y105 714,622 -54,068 -7.03 59,921 -6.27 0.0485
2019-05-14 2019-03-31 13F Merck COM 58933Y105 768,690 -61,335 -7.39 63,932 0.80 0.0525
2019-02-14 2018-12-31 13F Merck COM 58933Y105 830,025 -162,238 -16.35 63,422 -9.90 0.0581
2018-11-21 2018-09-30 13F/A-1 Merck COM 58933Y105 992,263 -2,312,846 -69.98 70,391 -64.91 0.0538
2018-11-14 2018-09-30 13F Merck COM 58933Y105 992,263 -2,312,846 70,391
2018-08-14 2018-06-30 13F Merck COM 58933Y105 3,305,109 -10,483,244 -76.03 200,620 -73.29 0.1603
2018-05-14 2018-03-31 13F Merck COM 58933Y105 13,788,353 -5,583 -0.04 751,052 -3.24 0.6063
2018-02-14 2017-12-31 13F Merck COM 58933Y105 13,793,936 331,467 2.46 776,185 -9.96 0.6013
2017-11-13 2017-09-30 13F Merck COM 58933Y105 13,462,469 -95,230 -0.70 862,002 -0.80 0.6934
2017-08-11 2017-06-30 13F Merck COM 58933Y105 13,557,699 -131,475 -0.96 868,913 -0.10 0.7328
2017-05-12 2017-03-31 13F Merck COM 58933Y105 13,689,174 -257,968 -1.85 869,810 5.94 0.7390
2017-03-20 2016-12-31 13F/A-1 Merck COM 58933Y105 13,947,142 -4,380,169 -23.90 821,068 -28.22 0.7295
2017-02-14 2016-12-31 13F Merck COM 58933Y105 13,961,442 821,910
2016-11-14 2016-09-30 13F Merck COM 58933Y105 18,327,311 -6,045,503 -24.80 1,143,807 -18.54 1.0749
2016-08-12 2016-06-30 13F Merck COM 58933Y105 24,372,814 -170,890 -0.70 1,404,118 8.12 1.3867
2016-05-13 2016-03-31 13F Merck COM 58933Y105 24,543,704 -19,446 -0.08 1,298,607 0.09 1.2703
2016-02-12 2015-12-31 13F Merck COM 58933Y105 24,563,150 -22,108 -0.09 1,297,426 6.85 1.2731
2015-11-12 2015-09-30 13F Merck COM 58933Y105 24,585,258 -95,523 -0.39 1,214,266 -13.58 1.2215
2015-08-13 2015-06-30 13F Merck COM 58933Y105 24,680,781 -768,196 -3.02 1,405,077 -3.95 1.2672
2015-05-14 2015-03-31 13F Merck COM 58933Y105 25,448,977 -8,167,116 -24.30 1,462,807 -23.38 1.3482
2015-02-13 2014-12-31 13F Merck COM 58933Y105 33,616,093 -1,441,575 -4.11 1,909,058 -8.14 1.7738
2014-11-13 2014-09-30 13F MERCK COM 58933Y105 35,057,668 -902,469 -2.51 2,078,219 -0.10 1.9876
2014-08-13 2014-06-30 13F MERCK COM 58933Y105 35,960,137 -3,999,059 -10.01 2,080,294 -8.30 1.9837
2014-05-14 2014-03-31 13F MERCK COM 58933Y105 39,959,196 -8,839,300 -18.11 2,268,484 -7.12 2.3198
2014-02-14 2013-12-31 13F MERCK COM 58933Y105 48,798,496 -1,339,100 -2.67 2,442,365 2.32 2.5462
2013-11-13 2013-09-30 13F MERCK COM 58933Y105 50,137,596 -559,550 -1.10 2,387,051 1.37 2.7115
2013-08-13 2013-06-30 13F MERCK COM 58933Y105 50,697,146 50,697,146 2,354,882 2.7967
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.