Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionLee Danner & Bass Inc
Latest Disclosed Ownership89,960 shares
Latest Disclosed Value $ 10,821,340
Lee Danner & Bass Inc reports 0.76% increase in ownership of MRK / Merck & Co., Inc.

On April 28, 2026 - Lee Danner & Bass Inc filed a 13F-HR form disclosing ownership of 89,960 shares of Merck & Co., Inc. (MX:MRK) valued at $10,821,340 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 89,285 shares of Merck & Co., Inc.. This represents a change in shares of 0.76% 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)
2026-04-28 2026-03-31 13F MERCK Stock 58933Y105 89,960 675 0.76 10,821 15.14 0.6798
2026-01-29 2025-12-31 13F MERCK Stock 58933Y105 89,285 -3,285 -3.55 9,398 20.97 0.6736
2025-10-29 2025-09-30 13F MERCK Stock 58933Y105 92,570 -922 -0.99 7,769 4.99 0.5653
2025-07-31 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 93,492 -3,778 -3.88 7,401 -15.23 0.5757
2025-04-29 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 97,270 -1,399 -1.42 8,731 -11.05 0.7061
2025-02-11 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 98,669 335 0.34 9,816 89,127.27 0.7778
2024-10-30 2024-09-30 13F Merck COM 58933Y105 98,334 -1,672 -1.67 11 -8.33 0.7864
2024-07-30 2024-06-30 13F Merck COM 58933Y105 100,006 1,580 1.61 12 20.00 0.9543
2024-02-01 2023-12-31 13F Merck COM 58933Y105 98,426 149 0.15 11 0.00 0.9192
2023-10-27 2023-09-30 13F Merck COM 58933Y105 98,277 -1,155 -1.16 10 -9.09 0.9163
2023-07-31 2023-06-30 13F Merck COM 58933Y105 99,432 -781 -0.78 11 10.00 0.9870
2023-05-02 2023-03-31 13F Merck COM 58933Y105 100,213 -2,640 -2.57 11 -9.09 0.9807
2023-02-01 2022-12-31 13F Merck COM 58933Y105 102,853 -407 -0.39 11 -99.88 1.0765
2022-10-31 2022-09-30 13F Merck COM 58933Y105 103,260 -593 -0.57 8,893 -6.07 0.9401
2022-07-25 2022-06-30 13F Merck COM 58933Y105 103,853 -1,457 -1.38 9,468 9.57 0.9564
2022-04-27 2022-03-31 13F Merck COM 58933Y105 105,310 -553 -0.52 8,641 6.51 0.7363
2022-01-27 2021-12-31 13F Merck COM 58933Y105 105,863 -2,790 -2.57 8,113 -0.59 0.6945
2021-11-01 2021-09-30 13F Merck COM 58933Y105 108,653 -2,316 -2.09 8,161 -5.43 0.7528
2021-07-27 2021-06-30 13F Merck COM 58933Y105 110,969 185 0.17 8,630 1.05 0.7819
2021-04-29 2021-03-31 13F Merck COM 58933Y105 110,784 10,557 10.53 8,540 4.16 0.8224
2021-02-09 2020-12-31 13F Merck COM 58933Y105 100,227 -494 -0.49 8,199 -1.87 0.8744
2020-11-12 2020-09-30 13F Merck COM 58933Y105 100,721 -5,313 -5.01 8,355 1.89 0.9896
2020-08-10 2020-06-30 13F Merck COM 58933Y105 106,034 -785 -0.73 8,200 -0.23 1.0458
2020-05-04 2020-03-31 13F Merck COM 58933Y105 106,819 10,060 10.40 8,219 -6.60 1.1761
2020-02-13 2019-12-31 13F Merck COM 58933Y105 96,759 -3,648 -3.63 8,800 4.12 0.9207
2019-10-30 2019-09-30 13F Merck COM 58933Y105 100,407 -336 -0.33 8,452 0.06 0.9069
2019-07-30 2019-06-30 13F Merck COM 58933Y105 100,743 -5,594 -5.26 8,447 -4.49 0.8933
2019-05-06 2019-03-31 13F Merck COM 58933Y105 106,337 -1,895 -1.75 8,844 6.94 0.9747
2019-01-29 2018-12-31 13F Merck COM 58933Y105 108,232 -1,133 -1.04 8,270 6.60 0.9734
2018-11-06 2018-09-30 13F Merck COM 58933Y105 109,365 -1,832 -1.65 7,758 14.93 0.7696
2018-11-02 2018-06-30 13F/A-1 Merck COM 58933Y105 111,197 -2,925 -2.56 6,750 8.59 0.7185
2018-08-06 2018-06-30 13F Merck COM 58933Y105 109,998 -4,124 7,246
2018-05-02 2018-03-31 13F Merck COM 58933Y105 114,122 9,040 8.60 6,216 5.12 0.6471
2018-02-02 2017-12-31 13F Merck COM 58933Y105 105,082 5,976 6.03 5,913 -6.82 0.6010
2017-10-27 2017-09-30 13F Merck COM 58933Y105 99,106 569 0.58 6,346 0.49 0.6830
2017-07-27 2017-06-30 13F Merck COM 58933Y105 98,537 391 0.40 6,315 1.27 0.7089
2017-05-23 2017-03-31 13F/A-1 Merck COM 58933Y105 98,146 -369 -0.37 6,236 7.52 0.7035
2017-05-04 2017-03-31 13F Merck COM 58933Y105 98,146 6,236
2017-01-30 2016-12-31 13F Merck COM 58933Y105 98,515 3,095 3.24 5,800 -2.60 0.6820
2016-10-26 2016-09-30 13F Merck COM 58933Y105 95,420 -1,450 -1.50 5,955 6.70 0.7258
2016-08-02 2016-06-30 13F Merck COM 58933Y105 96,870 -1,000 -1.02 5,581 1.75 0.6758
2016-04-27 2016-03-31 13F Merck COM 58933Y105 97,870 -3,864 -3.80 5,485 2.07 0.6736
2016-02-01 2015-12-31 13F Merck COM 58933Y105 101,734 -3,505 -3.33 5,374 3.39 0.7031
2015-11-03 2015-09-30 13F Merck COM 58933Y105 105,239 1,904 1.84 5,198 -11.64 0.6936
2015-08-05 2015-06-30 13F Merck COM 58933Y105 103,335 -400 -0.39 5,883 -1.34 0.7013
2015-05-05 2015-03-31 13F Merck COM 58933Y105 103,735 103,735 0.00 5,963 0.7033
2015-02-05 2014-12-31 13F Merck COM 58933Y105 0 -105,602 -100.00 0 -100.00
2014-10-28 2014-09-30 13F Merck COM 58933Y105 105,602 -4,818 -4.36 6,260 -2.00 0.7740
2014-08-04 2014-06-30 13F Merck COM 58933Y105 110,420 6 0.01 6,388 1.91 0.7790
2014-05-01 2014-03-31 13F Merck COM 58933Y105 110,414 -190 -0.17 6,268 13.22 0.8138
2014-02-06 2013-12-31 13F Merck COM 58933Y105 110,604 7,708 7.49 5,536 13.00 0.7385
2013-10-31 2013-09-30 13F Merck COM 58933Y105 102,896 2,284 2.27 4,899 4.84 0.6817
2013-08-07 2013-06-30 13F Merck COM 58933Y105 100,612 100,612 4,673 0.6812
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.