Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRB Capital Management, LLC
Latest Disclosed Ownership3,383 shares
Latest Disclosed Value $ 406,898
RB Capital Management, LLC reports 27.76% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - RB Capital Management, LLC filed a 13F-HR form disclosing ownership of 3,383 shares of Merck & Co., Inc. (MX:MRK) valued at $406,898 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 4,683 shares of Merck & Co., Inc.. This represents a change in shares of -27.76% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 3,383 -1,300 -27.76 407 -17.48 0.0864
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 4,683 577 14.05 493 43.02 0.0979
2025-10-21 2025-09-30 13F MERCK COM 58933Y105 4,106 -738 -15.24 345 -10.18 0.0711
2025-07-07 2025-06-30 13F MERCK COM 58933Y105 4,844 -713 -12.83 383 -23.09 0.0868
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 5,557 -318 -5.41 499 -14.73 0.1157
2025-02-18 2024-12-31 13F MERCK COM 58933Y105 5,875 -145 -2.41 584 -14.49 0.1333
2024-11-18 2024-09-30 13F MERCK COM 58933Y105 6,020 -247 -3.94 684 -11.87 0.1591
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 6,267 -753 -10.73 776 -16.31 0.1913
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 7,020 466 7.11 926 29.69 0.2434
2024-02-06 2023-12-31 13F MERCK COM 58933Y105 6,554 -157 -2.34 715 3.48 0.2046
2023-11-16 2023-09-30 13F MERCK COM 58933Y105 6,711 37 0.55 691 -10.39 0.2153
2023-12-11 2023-06-30 13F/A-1 MERCK COM 58933Y105 6,674 -48 -0.71 770 7.69 0.2317
2023-08-08 2023-06-30 13F MERCK COM 58933Y105 6,674 -48 770 0.1978
2023-05-10 2023-03-31 13F MERCK COM 58933Y105 6,722 288 4.48 715 0.28 0.2263
2023-01-19 2022-12-31 13F/A-1 MERCK COM 58933Y105 6,434 -93 -1.42 714 26.87 0.2521
2023-01-11 2022-12-31 13F MERCK COM 58933Y105 6,434 -93 1 0.2498
2022-10-24 2022-09-30 13F MERCK COM 58933Y105 6,527 42 0.65 562 -4.91 0.2154
2022-07-14 2022-06-30 13F MERCK COM 58933Y105 6,485 47 0.73 591 11.93 0.2203
2022-05-10 2022-03-31 13F/A-1 MERCK COM 58933Y105 6,438 2 0.03 528 7.10 0.1694
2022-04-11 2022-03-31 13F MERCK & CO. COM 58933Y105 6,438 2 528 0.1844
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 6,436 274 4.45 493 6.48 0.1538
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 6,162 35 0.57 463 -2.94 0.1740
2021-08-06 2021-06-30 13F/A-1 MERCK COM 58933Y105 6,127 -144 -2.30 477 -1.24 0.1801
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 6,127 -144 477 0.1172
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 6,271 -529 -7.78 483 -13.13 0.2131
2021-02-04 2020-12-31 13F MERCK & CO. COM 58933Y105 6,800 -287 -4.05 556 -3.47 0.2568
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 7,087 -91 -1.27 576 3.78 0.2707
2020-07-31 2020-06-30 13F MERCK & CO. COM 58933Y105 7,178 416 6.15 555 6.73 0.2941
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 6,762 18 0.27 520 -15.45 0.3341
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 6,744 33 0.49 615 8.66 0.3510
2019-10-10 2019-09-30 13F/A-1 MERCK COM 58933Y105 6,711 452 7.22 566 7.81 0.3632
2019-10-10 2019-09-30 13F MERCK COM 58933Y105 6,711 452 566
2019-08-07 2019-06-30 13F MERCK COM 58933Y105 6,259 956 18.03 525 19.05 0.3823
2019-05-08 2019-03-31 13F MERCK COM 58933Y105 5,303 27 0.51 441 9.43 0.3596
2019-01-15 2018-12-31 13F MERCK COM 58933Y105 5,276 21 0.40 403 8.04 0.4063
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 5,255 -199 -3.65 373 12.69 0.3309
2018-07-27 2018-06-30 13F MERCK COM 58933Y105 5,454 142 2.67 331 14.53 0.2452
2018-04-18 2018-03-31 13F MERCK COM 58933Y105 5,312 -443 -7.70 289 -10.80 0.2272
2018-02-02 2017-12-31 13F MERCK COM 58933Y105 5,755 29 0.51 324 -11.72 0.2307
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 5,726 1,139 24.83 367 24.83 0.0048
2017-07-10 2017-06-30 13F MERCK COM 58933Y105 4,587 23 0.50 294 1.38 0.2536
2017-05-04 2017-03-31 13F MERCK COM 58933Y105 4,564 104 2.33 290 10.27 0.2747
2017-02-15 2016-12-31 13F MERCK COM 58933Y105 4,460 4,460 263 0.2628
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.