Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRetirement Income Solutions, Inc
Latest Disclosed Ownership5,920 shares
Latest Disclosed Value $ 712,117
Retirement Income Solutions, Inc reports 2.10% decrease in ownership of MRK / Merck & Co., Inc.

On May 4, 2026 - Retirement Income Solutions, Inc filed a 13F-HR form disclosing ownership of 5,920 shares of Merck & Co., Inc. (MX:MRK) valued at $712,117 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 6,047 shares of Merck & Co., Inc.. This represents a change in shares of -2.10% 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)
2026-05-04 2026-03-31 13F MERCK COM 58933Y105 5,920 -127 -2.10 712 11.95 0.1217
2026-01-27 2025-12-31 13F MERCK COM 58933Y105 6,047 -780 -11.43 637 11.19 0.1080
2025-10-14 2025-09-30 13F MERCK COM 58933Y105 6,827 -2,000 -22.66 573 -18.05 0.0980
2025-07-15 2025-06-30 13F MERCK COM 58933Y105 8,827 0 0.00 699 -11.87 0.1282
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 8,827 0 0.00 792 -9.79 0.1658
2025-01-31 2024-12-31 13F MERCK COM 58933Y105 8,827 -388 -4.21 878 -16.06 0.1772
2024-11-08 2024-09-30 13F MERCK COM 58933Y105 9,215 -247 -2.61 1,046 -10.67 0.2391
2024-08-01 2024-06-30 13F MERCK COM 58933Y105 9,462 -113 -1.18 1,171 -7.28 0.2830
2024-05-03 2024-03-31 13F Merck COM 58933Y105 9,575 0 0.00 1,263 21.09 0.2865
2024-02-08 2023-12-31 13F Merck COM 58933Y105 9,575 231 2.47 1,044 8.53 0.2595
2023-11-01 2023-09-30 13F Merck COM 58933Y105 9,344 -1,540 -14.15 962 -23.43 0.2692
2023-07-28 2023-06-30 13F Merck COM 58933Y105 10,884 -150 -1.36 1,256 6.99 0.3362
2023-05-05 2023-03-31 13F Merck COM 58933Y105 11,034 1,309 13.46 1,174 8.81 0.3423
2023-02-08 2022-12-31 13F Merck COM 58933Y105 9,725 864 9.75 1,079 0.3427
2022-11-02 2022-09-30 13F Merck COM 58933Y105 8,861 0 0.00 1 0.2756
2022-08-16 2022-06-30 13F Merck COM 58933Y105 8,861 0 0.00 1 0.2879
2022-06-02 2022-03-31 13F/A-1 Merck COM 58933Y105 8,861 0 0.00 1 -100.00 0.2009
2022-05-06 2022-03-31 13F Merck COM 58933Y105 8,861 0 727 0.2009
2022-02-04 2021-12-31 13F Merck COM 58933Y105 8,861 0 0.00 679 1.95 0.1815
2021-11-04 2021-09-30 13F Merck COM 58933Y105 8,861 -116 -1.29 666 -4.58 0.2230
2021-07-29 2021-06-30 13F Merck COM 58933Y105 8,977 -123 -1.35 698 -0.57 0.2388
2021-05-13 2021-03-31 13F Merck COM 58933Y105 9,100 110 1.22 702 -4.49 0.2419
2021-02-12 2020-12-31 13F Merck COM 58933Y105 8,990 -269 -2.91 735 -4.30 0.2664
2020-11-12 2020-09-30 13F Merck COM 58933Y105 9,259 0 0.00 768 7.26 0.3402
2020-08-06 2020-06-30 13F Merck COM 58933Y105 9,259 -256 -2.69 716 -2.19 0.3022
2020-05-11 2020-03-31 13F Merck COM 58933Y105 9,515 645 7.27 732 -9.29 0.4108
2020-02-06 2019-12-31 13F Merck COM 58933Y105 8,870 -300 -3.27 807 4.53 0.3358
2019-10-25 2019-09-30 13F Merck COM 58933Y105 9,170 939 11.41 772 11.88 0.4119
2019-07-23 2019-06-30 13F Merck COM 58933Y105 8,231 0 0.00 690 0.73 0.3678
2019-05-13 2019-03-31 13F Merck COM 58933Y105 8,231 0 0.00 685 8.90 0.3925
2019-01-30 2018-12-31 13F Merck COM 58933Y105 8,231 -58 -0.70 629 6.97 0.4073
2018-11-01 2018-09-30 13F Merck COM 58933Y105 8,289 775 10.31 588 28.95 0.3294
2018-07-26 2018-06-30 13F Merck COM 58933Y105 7,514 -983 -11.57 456 -1.51 0.2777
2018-04-30 2018-03-31 13F Merck COM 58933Y105 8,497 -1,446 -14.54 463 -17.17 0.2826
2018-02-06 2017-12-31 13F Merck COM 58933Y105 9,943 9,943 559 0.3281
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.