Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionDuncker Streett & Co Inc
Latest Disclosed Ownership66,212 shares
Latest Disclosed Value $ 7,964,609
Duncker Streett & Co Inc reports 4.62% increase in ownership of MRK / Merck & Co., Inc.

On April 29, 2026 - Duncker Streett & Co Inc filed a 13F-HR form disclosing ownership of 66,212 shares of Merck & Co., Inc. (MX:MRK) valued at $7,964,609 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 63,287 shares of Merck & Co., Inc.. This represents a change in shares of 4.62% 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)
2026-04-29 2026-03-31 13F MERCK COM 58933Y105 66,212 2,925 4.62 7,965 19.56 1.5138
2026-01-27 2025-12-31 13F MERCK COM 58933Y105 63,287 33,202 110.36 6,662 163.80 1.1839
2025-10-23 2025-09-30 13F MERCK COM 58933Y105 30,085 -550 -1.80 2,525 4.12 0.4399
2025-07-28 2025-06-30 13F MERCK COM 58933Y105 30,635 437 1.45 2,425 -10.52 0.4425
2025-04-22 2025-03-31 13F MERCK COM 58933Y105 30,198 -290 -0.95 2,711 -10.62 0.5371
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 30,488 2,237 7.92 3,033 -5.49 0.5631
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 28,251 64 0.23 3,208 -8.05 0.5854
2024-07-31 2024-06-30 13F MERCK COM 58933Y105 28,187 10 0.04 3,490 -6.13 0.6709
2024-04-23 2024-03-31 13F MERCK COM 58933Y105 28,177 -989 -3.39 3,718 16.92 0.7340
2024-01-30 2023-12-31 13F MERCK COM 58933Y105 29,166 -613 -2.06 3,180 3.72 0.6713
2023-10-26 2023-09-30 13F MERCK COM 58933Y105 29,779 -347 -1.15 3,066 -11.82 0.7135
2023-07-20 2023-06-30 13F MERCK COM 58933Y105 30,126 -389 -1.27 3,476 7.09 0.7774
2023-04-24 2023-03-31 13F MERCK COM 58933Y105 30,515 -2,018 -6.20 3,246 -10.06 0.7732
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 32,533 11 0.03 3,610 28.85 0.8715
2022-11-04 2022-09-30 13F MERCK COM 58933Y105 32,522 -939 -2.81 2,801 -8.19 0.7265
2022-08-04 2022-06-30 13F MERCK COM 58933Y105 33,461 -124 -0.37 3,051 10.70 0.7311
2022-05-09 2022-03-31 13F MERCK COM 58933Y105 33,585 -2,428 -6.74 2,756 -0.14 0.5481
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 36,013 -2,032 -5.34 2,760 -3.43 0.4752
2021-11-03 2021-09-30 13F MERCK COM 58933Y105 38,045 745 2.00 2,858 -1.48 0.5412
2021-07-27 2021-06-30 13F MERCK COM 58933Y105 37,300 -3,318 -8.17 2,901 -7.35 0.5349
2021-04-28 2021-03-31 13F MERCK & CO. COM 58933Y105 40,618 -4,552 -10.08 3,131 -15.26 0.5971
2021-02-02 2020-12-31 13F MERCK & CO. COM 58933Y105 45,170 -14,915 -24.82 3,695 -25.86 0.7149
2020-10-28 2020-09-30 13F MERCK & CO. COM 58933Y105 60,085 -474 -0.78 4,984 6.43 1.0880
2020-07-22 2020-06-30 13F MERCK & CO. COM 58933Y105 60,559 -2,812 -4.44 4,683 -3.96 1.1143
2020-04-27 2020-03-31 13F MERCK & CO. COM 58933Y105 63,371 -456 -0.71 4,876 -16.00 1.3019
2020-01-27 2019-12-31 13F MERCK COM 58933Y105 63,827 -836 -1.29 5,805 6.63 1.2177
2019-10-31 2019-09-30 13F MERCK COM 58933Y105 64,663 164 0.25 5,444 0.65 1.2657
2019-07-24 2019-06-30 13F MERCK COM 58933Y105 64,499 -1,634 -2.47 5,409 -1.65 1.2139
2019-04-29 2019-03-31 13F MERCK COM 58933Y105 66,133 747 1.14 5,500 10.09 1.2673
2019-01-24 2018-12-31 13F MERCK COM 58933Y105 65,386 12,341 23.27 4,996 32.77 1.3374
2018-10-22 2018-09-30 13F MERCK COM 58933Y105 53,045 148 0.28 3,763 17.19 0.8547
2018-07-23 2018-06-30 13F MERCK COM 58933Y105 52,897 332 0.63 3,211 12.16 0.7964
2018-04-26 2018-03-31 13F MERCK COM 58933Y105 52,565 182 0.35 2,863 -2.88 0.7247
2018-01-23 2017-12-31 13F MERCK COM 58933Y105 52,383 410 0.79 2,948 -11.42 0.7579
2017-10-25 2017-09-30 13F MERCK COM 58933Y105 51,973 -824 -1.56 3,328 -1.63 1.0074
2017-07-21 2017-06-30 13F MERCK COM 58933Y105 52,797 -740 -1.38 3,383 -0.56 1.0550
2017-04-25 2017-03-31 13F MERCK COM 58933Y105 53,537 3,091 6.13 3,402 14.58 1.0665
2017-01-26 2016-12-31 13F MERCK COM 58933Y105 50,446 357 0.71 2,969 -5.02 0.9875
2016-10-20 2016-09-30 13F MERCK COM 58933Y105 50,089 19 0.04 3,126 8.39 1.0829
2016-07-20 2016-06-30 13F MERCK COM 58933Y105 50,070 22 0.04 2,884 8.91 1.0257
2016-04-25 2016-03-31 13F MERCK & CO INC COM 58933Y105 50,048 499 1.01 2,648 1.15 0.9802
2016-01-20 2015-12-31 13F MERCK & CO INC COM 58933Y105 49,549 -175 -0.35 2,618 6.60 0.9812
2015-10-27 2015-09-30 13F MERCK & CO INC COM 58933Y105 49,724 -129 -0.26 2,456 -13.46 0.9549
2015-07-20 2015-06-30 13F MERCK & CO INC COM 58933Y105 49,853 -5,808 -10.43 2,838 -11.31 0.9890
2015-04-28 2015-03-31 13F MERCK & CO INC COM 58933Y105 55,661 -942 -1.66 3,200 -0.47 1.0473
2015-01-22 2014-12-31 13F MERCK & CO INC COM 58933Y105 56,603 20 0.04 3,215 -4.17 1.0540
2014-10-23 2014-09-30 13F MERCK & CO INC COM 58933Y105 56,583 -1,239 -2.14 3,355 0.30 1.1437
2014-07-23 2014-06-30 13F MERCK & CO INC COM 58933Y105 57,822 920 1.62 3,345 3.53 1.0821
2014-04-23 2014-03-31 13F MERCK & CO INC COM 58933Y105 56,902 19 0.03 3,231 13.49 1.1433
2014-01-22 2013-12-31 13F MERCK & CO INC COM 58933Y105 56,883 569 1.01 2,847 6.19 1.0247
2013-10-23 2013-09-30 13F MERCK & CO INC COM 58933Y105 56,314 2,818 5.27 2,681 7.89 1.0855
2013-07-26 2013-06-30 13F MERCK & CO INC COM 58933Y105 53,496 53,496 2,485 0.9516
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.